“You could do this with a manual compression gauge and get the right cylinder”…pans to face…”But isn’t it cooler to do it with a pressure transducer “ 😂 quote of the day
Good morning Ivan from Suffolk England. Really enjoy watching your Video's 63 and still learning. Thank you for all the effort you put into them. Regards Richard 🇬🇧
Ivan, it is clear that this customer has exhausted all avenues of repair and you are the last resort; even adding the "Superman" spare tire cover obviously did NOTHING to help this Jeep in the least. It is just SO entertaining to hear you impersonate those engine noises. I live across the river from Metropolis, Illinois and see many of those covers. I'll never understand why people can't keep gas in their cars. GREAT VIDEO!
At first I use to hate your video because I knew nothing about pico scope and it was hard for me to understand the advance method of diagnosing. But I kept watching Many of your old and new video. And today I got a better understanding of how everything works and I just want to say thank you. everyone watching your videos can literally work on any vehicle ❤❤
I seem to remember 50 years ago in auto shop when a SUN scope the size of a refrigerator was hooked to a car you could deactivate cylinders one at a time and see if the idle rpm changed. If it didn't you knew that was the cylinder not contributing. Do modern scanners do that and is that a test that would have identified cylinder 4 without having to disassemble? Your use of bore scope and leakdown test was very definitive. Nice job as always.
exactly... the computer in many turn off injector for the cylindee that misses but this one didn't even know the misses...AND HAD THAT ABILITY. I remember those huge Sun machines... cool .
Could be a shady reman company ground the hell out of a rough seat and shimmed the spring to get things working cheaply rather than replacing the seat. I'm sure you've seen that one a few times as I have too. Thanks for sharing. Love these old 4.0's.
Oh boy! Ivan vs. “It’s a Jeep Thing”, round 1. You know it’s good when Ivan jumps immediately to verifying compression precisely. Thanks for a fun lesson as always man. And yes, a Pressure Transducer is absolutely “cooler”!
These heads are infamous for cracks. Have used heads magnaflux zyglo pressure tested . Next his trans mission will fail after fixing motor. Common on high milage stuff. Excellent channel
Great diagnostic, Ivan! It almost looks like the exhaust valve in #4 has a smaller diameter than the other ones (or has completely lost the valve seat). Didn't think you would tackle this, but now we're on to an interesting Part 2 :-)
Good one Ivan. I wish we had the Pico and the borescope 15-20 years ago! Would have saved a lot of time! I agree about the gas. Except for an in tank fuel pump problem, PLEASE at least have half a tank of fuel! Those 4.0L 6 cylinder engines were great! To bad they're using less than the best now. On to part two.
A proper valve job on this run-out head would involve seat and valve replacement, resurfacing, and possibly a multitude of other expensive machine shop processes. This would sideline the vehicle for weeks or months and cost a small fortune. A good used or rebuilt head will fix the problem, so long as the lifters are working properly.
The 3.8 litre Buick L36 V6 engine which was Holdens ECOTEC version had the same valve seat recession problem at about 236,000 miles or 380,000 kilometres in his 2000 model Holden VX Commodore due to the use of LP gas which is hard on the exhaust valve seats. His solution to fix the problem was to replace the whole engine which he got from a 2004 model Holden VY Commodore at the local auto dismantlers back in 2017, the engine had done 200,000 kilometres or 120,000 miles in that car To be honest, I don't know why he didn't just replace the cylinder heads with reconditioned exchange cylinder heads, replace the pushrods which were scuffed & possibly the valve rockers as well, there were used cylinder heads for sale on eBay as well. He was worried about reliability but he barely drives the car now because he's always driving his Colorado,he also decided to replace the 4L60E transmission with another one from a VY Commodore as well probably to fix the delay on takeoff that car seems to have but when the VY Commodore transmission was fitted (on the second go because he broke the pump rotor inside of the hydraulic pump because the tangs on the torque converter shaft were misaligned) it didn't make a difference so I don't know if that's GM or Holdens fault. My VY Commodore has a tweaked 5.7 litre Chevrolet LS1 V8 engine & T56 Tremec manual transmission fitted, it's approaching 397,000 original kilometres (247,000 miles) on the odometer,I prefer to drive that car very much more than the 3.8 litre Buick L36 V6 powered Holden VX Commodore !
Yep LPG will do that to exhaust valves + seats. Some brands more then others. But it will happen much faster if the heads are made of cast iron with the seats cut straight into the casting (like Ford Pinto OHC inline4). In such a case you can have special valve seats machined in. If i remember correctly the material is sintered steel made by Schneider. I could be wrong tho. It has been at least 15y ago since i had it done. The accelerated wear is caused by micro welding that happens between valve and seat as they slam together and get ripped apart again. Specially at high revs.
Brother calls me yesterday with an 07 Silverado that has over 75 pounds of fuel pressure. I said need a regulator/pump. He said brand new pump. I asked the brand. He says Delphi. Sorry dude, if you got no FSCM, you got a bad regulator. Apparently it had the same issue with the old pump too. Both banks running rich. I haven't gotten over there yet to check it out.
I just don’t get it. For someone who supposedly considers you worth the effort to employ, and wants their vehicle fixed, they give it to you with an empty fuel tank. To me that’s the ultimate sign of disrespect. I’d tell them to turn around and go get some gas before dropping it off, or no work gets done. That’s just embarrassing to do what the owner did there
Exactly... customer brought it in for a detailed diagnosis and analysis. Dude you need a new engine will not cut it here. Ivan knows how to run a business. 💯
I am floored that people will travel hours to see you and yet can't put a drop of gas in their car for testing????? Don't they watch your videos? You are a trooper and I hope that you charge them double per gallon for the fill up (LOL I know that you wont but you should) Great videos as always
These engines in that year range had all sorts of head issues, they would crack under where the oil cap is and leak coolant into the oil, the valves had carbon issues from low rpm, then they would burn and wear the seats, they had TSB’s for fuel vaporization after a hog soak, the list of issues just go on, great video as always Ivan👍
@@Garth2011they had head issues from 99 to about 2003 then they changed the head casting to fix the cracking issue. They still had carbon issues with the valves though, sometimes you could repair just with combustion chamber cleaner others got full valve jobs with new springs.
Sometimes what can cause a burnt exhaust valve is a partially plugged fuel injector. It causes the cylinder to run very lean and gets the valve hot to the point of burning a chunk off of it.
I'm not familiar with these engines but I did wonder if it was old enough that it had seats machined direct into the iron head. Fitting hardened seats won't be cheap, but will hopefully mean many more miles of life.
A freind of mine had a chevy truck he bought new . I heard it running and it sounded like a dead miss he said it sounded like that since he bought it. So we took the heads off and took them to a machine shop .The man said the one cylinder never had a valve seat installed from the factory.This was in the early 80s.Ran much better after we put back together.
Retired now but it was common to see exhaust valves receded that far or further on cast iron heads running on LPG in the days of leaded fuel. LPG has no lead, hence valve seat recession caused by "welding" of the valve seat to the head with no lead to intervene. Over time the seat material goes out the exhaust pipe and the valve becomes recessed. The ticking that goes with it is the valve clearance in the "lash" of hydraulic followers running out of clearance. Usual cure was to put inkonel or other hardened valve seats in the head and stainless or inkonel valves in. Since introduction of unleaded fuel and aluminium head the seats are induction hardened or in aluminium heads, hardened inserts.
Can you let us know if the head casting no. Is 0331? If it is - is there a TUPY casted under oil filler neck? If not - make sure you get a TUPY unit. Non tupy are cracking, causing issues on cylinder 3 and 4
Wow, that exhaust valve is sunken deep into that head. I had a YJ once upon a time that had a soft valve seat that caused the same problem. The Indiana salt eventually rotted that Jeep away.
Hi Ivan, always good to see your videos!! Ive noticed you've shifted over to multi-part series over the last few months...did that just work out thay way from the nature of the jobs or was that a conscious choice? Thanks as always! Would love to see you and Eric collaborate again sometime!
Replacement engine, had a cylinder head that was not correctly serviced ( el cheapo). Pretty normal. If the engine does not have excess blow by (lift oil cap at idle) and poor compression, its going through the valve seats. At least one valve is recessed back into the valve seat. Recessed valves are simply lots of miles and the head needs new valve seats or replacement.
Ivan , you are dealing with a Virginian , smart and fast decision maker, let's put it this way, after spending tons on $ , replacing so many parts and a new engine , I wouldn't take it back to my previous mechanic either !.
I wonder how many miles were on that "replacement" engine before it was installed? The combustion chamber honestly doesn't look that bad aside from that pooched valve. I have a 98 (same Jeep) with 190k on it and I just pulled the plugs to take a peek at It's heath and they are golden! I added an Accel High Energy (Hot spark) ignition coil about 30k miles ago and the difference in combustion is considerable.
Nice video of another case study. It will be interesting to see what lurks in the dark to surprise you. It looks like it might have ingested the valve seat on that exhaust valve.
Nice 👍🏼 one ! Thanks for sharing your time and expertise with us Ivan ! Can I ask you about identifying / determining the intake & exhaust valves please ? Did you use look it up in a schematic or were you able to find out by visual analysis ?
I do car my own repairs (as a DIY), and occasionally for family only. My standing rule is, if the the fuel tank is empty (or battery is spanked), I charge $25 labor, plus gas. (PS: I otherwise, don’t charge labor for family, and won’t work on anyone else’s cars).
Did someone redo that head already and put an undersized valve in it? Not sure how a valve that otherwise looks ok could sink below the head surface. I'd love to see the valve train on that particular valve. Almost like a rocker slipped off but that doesn't fully explain the valve bypassing the seat. Even with a working valve in cylinder 4 that head still wouldn't run too great given those other cylinder pressures. Hopefully a valve job solves the compression issues and it isn't leaking/stuck rings. Thanks for the video Ivan, always love to see a new PHAD's post.
Lotta miles for the inline, I always liked the straight 6, this looks like a rebuild that got done pretty fast, fresh head might be worth it and shouldn't be too expensive
Wow, that's a dead-on diagnosis, Ivan! I have never seen a phenomenon like this before. If it's the valve seat, why is this one so bad or is it missing? Could it be that this is a reman head and either the valve seat was not put back in or the wrong size valve was put in? I guess we'll find out in part two.
BTW, I just watched a video on replacing valve seats and it looks like it's a job for an experienced and equipped machine shop. I would hope that you can just get a new head or just replace the valve if it is the wrong size. 😊
Fascinating stuff, thanks Ivan. I'm no expert, but it strikes me that in cases like this of very poor engine performnace, it makes more economic sense to go straight for a compression test to avoid the ignition system & fuel system parts cannon?
Hypothesis: tappet stuck, making the exhaust valve slightly leaky. This caused hot exhaust gasses erode away the valve, but not the seat. End result is a recessed valve that is (still) not sealing properly even if the tappet unstuck itself.
Lack of valve clearance would typically end up with a burnt valve rather than an evenly recessed valve seat. This looks like a material problem, like you get from running a head with cast iron seats on unleaded fuel.
Wow, what happened to that seat? Those were actually pretty good engines, but if it was a “used” swap who knows how many miles it actually has. I’ve seen a couple of these with broken piston skirts, which creates a pretty distinctive noise. Very short skirts for whatever reason. Considering the compression on the other cylinders, I would be a bit reluctant to even put a used head on it, but it is of course the owners decision. 👍👍🇺🇸
More information about this engine would be preferred regarding age/miles however, if it was used when installed, I would rebuild the entire engine. If it was rebuilt and only had 90,000 miles on it then, the valve job seems to be a fair limit.
I know these old Jeeps were infamous for dropping valve seats. Usually brought on by overheating issues. The Jeep Liberty with the 3.7 V6 had a bad rap for that. But when a valve seat drops out, mass destruction follows. I'm not seeing that here. So, did this valve seat pound it way deeper into the head? Or did it just burn it away? Ivan, I hope you take us along on a tear down. I'd really like to see what happened here.
i was thinking the head is cast iron, there are no replaceable seats on those, the seats are induction hardened, sure you can machine them for replaceable seats, I ve seen machined/ replaceable seats come loose over time. better off getting a whole new TUPY head
Ivan, thank you for sharing the amazing work you do. Will you consider dumbing it down for us mere mortals and reduce the abbreviations and jargon? ASD ?? Etc. Thank you!
Automatic Shutdown Relay. It shuts off fuel and ignition when off, or removed. It's supposed to help prevent engine fires and hydrolocking in accident/rollover conditions.
My 97 sounded like that exhaust once, but it was because I'd pulled one of the plug wires off to get it out of my way when changing the oil filter adapter o-rings and forgot to put it back on... 🤣
Hi again Ivan. To be polite your diagnostic was correct, at 100% sensitivity there was no misfires on any cylinders which was correct which leads you bad compression if its firing correctly or am I wrong? Regards Richard 🇬🇧
These engines are just too old.. The misfire counter doesn't work very well. Plus I think it only goes by a meter reading inside the coils.. As long as the spark plug is still sparking-- it won't read a misfire. Because I don't think these even have a knock sensor-- so it's not reading misfires in the same way as a more modern vehicle. ( I could be wrong though.. :)
It looks like the owner loves driving their Jeep, so I'm not surprised he or she wants you to continue the fix. Especially after driving it for four hours
I learned years ago back in the mid 90's my neighbor had a 77 dodge motorhome with a 440 4bbl engine and it was running on 4 cylinders and when I pulled the heads the exhaust valve seats in 4 cylinders were gone but I couldn't figure out the fuel smell and I took the heads to the local machine shop and Larry called me and asked what fuel was ran through it so I called the owner and he said methanol fuel he got in the State of Ohio and by the time he got home in Pa 4 cylinders had no compression so I called Larry and told him and he said yep, you can't run methanol in any Chrysler Product, I got the heads back with a valve job done and the heads planed .015 thousands and that 440 would scream in that motorhome!!!! Let it be a lesson to all you Chrysler guys to never run methanol gas in your engines!!!!!!
as an entrepreneur you are watching the world CLOSELY and seeing what people need. Capitalism is just that; finding what people need and supplying it; and then getting REWARDED for it. You designed and marketed that pressure transducer you DEMONSTRATED. It works with 21st century Pico Scopes to yield accurate results. Folks need to appreciate that such a transducer is subject to your production. It may not always be available so interested folks should get one will supplies last.
that 4.0 straight 6 is still the best one jeep ever built compared to all the 4 cyl and v6 engines ....i'd pick the straight over any of the other garbage engines
0331 head prone to cracking if overheated, I remember that much. The old head was 0630 wasn't it, or am I mistaken? It's been awhile since the Jeep ownership days, 12 and a half years to be precise.
Seen a brand new Jeep that ran like garbage when I worked for a Chrysler dealership. Wonder why? The exhaust was plugged up because someone didn't make the hole on main pipe for the 1 cylinder that it goes to.
You said they already replaced the motor. Was it a junk yard motor or a rebuilt from a reputable company? If it already is having a problem it wasn't from a reputable rebuilder then. There has to be a warranty on it if it's a rebuilt RIGHT ?
Strange... Looks like the head of the valve eroded away making it appear that the valve was recessed. Hence it's weird button shape. The seat looked semi ok. Maybe excessive heat from something caused the erosion?
I do not like the way how you did the compresión check by removing all Spark plugs 9:07 . With all plugs out you can miss some important information as per example how about if the companion cylinder had any issues on exhaust as worn lobe exhaust flow issues normally will be reflected on the brother cylinder but with all plugs out can conpress any thing on exhaust if will be the case
Even gasoline has gotten complicated, there's 85 87 88 89 91 and 93. WTF! Here in New Jersey we have 87 89 and 93 that's it when i go to Pennsylvania the pump is like one of those soda dispensers with a million different options. A recent video from watchjrgo, he had a Chevy equinox that wouldn't run, he tried everything and was almost ready to call a bad engine, a guy was helping him and it was his sisters vehicle they even walnut blasted the valves because they were ll carboned up it being a GDI engine, she had recently put gas in the tank, after exhausting all other options they g]kept cranking the engine and it would kind of run for a second, he then sprayed starting fluid in and it ran, they decided to siphon some gas out and it didn't look right, they drained most of the gas and put new gas in and it ran, they realized that she had put the wrong gas in, this was a non flex fuel engine and she put in 85 or something, it requires 91 octane, they managed to drive it to a gas station and filled it with the proper fuel and it ran perfect, it was a 2016 model, my sister had one and it required premium, I don't think that's the case with all of them, i wonder if this ever happened to anyone else and was sold a new engine when all it was was the wrong gas. ruclips.net/video/1J4ssn0hQ6Q/видео.htmlsi=-qhUpe1KOmNrgmvH
“You could do this with a manual compression gauge and get the right cylinder”…pans to face…”But isn’t it cooler to do it with a pressure transducer “ 😂 quote of the day
Good morning Ivan from Suffolk England. Really enjoy watching your Video's 63 and still learning. Thank you for all the effort you put into them.
Regards Richard 🇬🇧
Suffolk, England here too. Ivan is the best.
Not Suffolk but Kent - still always eagerly await your videos
Not Suffolk but Houston Texas.... What ?? :)
Ivan, it is clear that this customer has exhausted all avenues of repair and you are the last resort; even adding the "Superman" spare tire cover obviously did NOTHING to help this Jeep in the least. It is just SO entertaining to hear you impersonate those engine noises. I live across the river from Metropolis, Illinois and see many of those covers. I'll never understand why people can't keep gas in their cars. GREAT VIDEO!
it's obvious that the #4 exhaust valve's seat is exhausted.
Hello from the Catsup bottle. Worked in Metro alot.
"but it's cooler to do it with a pressure transducer. Right?" Right! Love it. We get all the cool toys.
You do know he makes and sells those right?
You also do know there’s not a single thing wrong with him making and selling those transducers- right!!!???
@@YOUZTUBE2000Do you see a comment that I don't? No one said there was anything wrong with Ivan selling his product. o.0
At first I use to hate your video because I knew nothing about pico scope and it was hard for me to understand the advance method of diagnosing. But I kept watching Many of your old and new video. And today I got a better understanding of how everything works and I just want to say thank you. everyone watching your videos can literally work on any vehicle ❤❤
I seem to remember 50 years ago in auto shop when a SUN scope the size of a refrigerator was hooked to a car you could deactivate cylinders one at a time and see if the idle rpm changed. If it didn't you knew that was the cylinder not contributing. Do modern scanners do that and is that a test that would have identified cylinder 4 without having to disassemble? Your use of bore scope and leakdown test was very definitive. Nice job as always.
exactly... the computer in many turn off injector for the cylindee that misses but this one didn't even know the misses...AND HAD THAT ABILITY. I remember those huge Sun machines... cool
.
A lot depends on the cars ability to shut off certain para meters, in GM cars and other you can check miss fires per each cylinder.
Could be a shady reman company ground the hell out of a rough seat and shimmed the spring to get things working cheaply rather than replacing the seat. I'm sure you've seen that one a few times as I have too. Thanks for sharing. Love these old 4.0's.
Oh boy! Ivan vs. “It’s a Jeep Thing”, round 1. You know it’s good when Ivan jumps immediately to verifying compression precisely. Thanks for a fun lesson as always man. And yes, a Pressure Transducer is absolutely “cooler”!
I used to fire up an engine on a tire just to find out just how good it really is before installimg it in a rig~Thanks Ivan way to go there!!!
Good morning all. Let's get after this diag. We all know Ivan's got this!
Glad he approved the repair. It's been a while since I did a rebuild on one of these 4.0L's ... Happy to watch it repaired for old times sake. YAY!
Coffee and PHAD fantastic
No nonsense, no time wasted! You went straight to the heart of that problem...
These heads are infamous for cracks.
Have used heads magnaflux zyglo pressure tested .
Next his trans mission will fail after fixing motor.
Common on high milage stuff.
Excellent channel
The earlier model heads had this issue, but resolved it in the 03-04 year design I believe with the TUPY 0331 head.
@@VaporheadATC thanks I will save that info .
Great diagnostic, Ivan! It almost looks like the exhaust valve in #4 has a smaller diameter than the other ones (or has completely lost the valve seat). Didn't think you would tackle this, but now we're on to an interesting Part 2 :-)
Glad to hear the customer approved the repair.
Good one Ivan. I wish we had the Pico and the borescope 15-20 years ago! Would have saved a lot of time!
I agree about the gas. Except for an in tank fuel pump problem, PLEASE at least have half a tank of fuel!
Those 4.0L 6 cylinder engines were great! To bad they're using less than the best now.
On to part two.
A proper valve job on this run-out head would involve seat and valve replacement, resurfacing, and possibly a multitude of other expensive machine shop processes. This would sideline the vehicle for weeks or months and cost a small fortune. A good used or rebuilt head will fix the problem, so long as the lifters are working properly.
The 3.8 litre Buick L36 V6 engine which was Holdens ECOTEC version had the same valve seat recession problem at about 236,000 miles or 380,000 kilometres in his 2000 model Holden VX Commodore due to the use of LP gas which is hard on the exhaust valve seats.
His solution to fix the problem was to replace the whole engine which he got from a 2004 model Holden VY Commodore at the local auto dismantlers back in 2017, the engine had done 200,000 kilometres or 120,000 miles in that car
To be honest, I don't know why he didn't just replace the cylinder heads with reconditioned exchange cylinder heads, replace the pushrods which were scuffed & possibly the valve rockers as well, there were used cylinder heads for sale on eBay as well.
He was worried about reliability but he barely drives the car now because he's always driving his Colorado,he also decided to replace the 4L60E transmission with another one from a VY Commodore as well probably to fix the delay on takeoff that car seems to have but when the VY Commodore transmission was fitted (on the second go because he broke the pump rotor inside of the hydraulic pump because the tangs on the torque converter shaft were misaligned) it didn't make a difference so I don't know if that's GM or Holdens fault.
My VY Commodore has a tweaked 5.7 litre Chevrolet LS1 V8 engine & T56 Tremec manual transmission fitted, it's approaching 397,000 original kilometres (247,000 miles) on the odometer,I prefer to drive that car very much more than the 3.8 litre Buick L36 V6 powered Holden VX Commodore !
Yep LPG will do that to exhaust valves + seats.
Some brands more then others. But it will happen much faster if the heads are made of cast iron with the seats cut straight into the casting (like Ford Pinto OHC inline4). In such a case you can have special valve seats machined in.
If i remember correctly the material is sintered steel made by Schneider.
I could be wrong tho. It has been at least 15y ago since i had it done.
The accelerated wear is caused by micro welding that happens between valve and seat as they slam together and get ripped apart again. Specially at high revs.
Brother calls me yesterday with an 07 Silverado that has over 75 pounds of fuel pressure. I said need a regulator/pump. He said brand new pump. I asked the brand. He says Delphi. Sorry dude, if you got no FSCM, you got a bad regulator. Apparently it had the same issue with the old pump too. Both banks running rich. I haven't gotten over there yet to check it out.
Sounds fun!
I just don’t get it. For someone who supposedly considers you worth the effort to employ, and wants their vehicle fixed, they give it to you with an empty fuel tank. To me that’s the ultimate sign of disrespect. I’d tell them to turn around and go get some gas before dropping it off, or no work gets done. That’s just embarrassing to do what the owner did there
At my shop they just pay the hourly rate for me to go get gas, plus the cost of the gas.
@@tomjohnson6036 As they should...
I normally put $20 and charge $40.
Yeah, it's a thing, apparently. They get charged for it. DO they REALLY think you'll furnish a free tank of gas?
@@HelicopterDad-u5b You know, that IS a good point! Though you'd think they'd ask if they should bring the car in on vapors or not.
Exactly... customer brought it in for a detailed diagnosis and analysis. Dude you need a new engine will not cut it here. Ivan knows how to run a business. 💯
I am floored that people will travel hours to see you and yet can't put a drop of gas in their car for testing????? Don't they watch your videos? You are a trooper and I hope that you charge them double per gallon for the fill up (LOL I know that you wont but you should)
Great videos as always
I love to watch your methodical step by step diagnosis and explanations. Always learn something.
These engines in that year range had all sorts of head issues, they would crack under where the oil cap is and leak coolant into the oil, the valves had carbon issues from low rpm, then they would burn and wear the seats, they had TSB’s for fuel vaporization after a hog soak, the list of issues just go on, great video as always Ivan👍
What years were good for the 4.0 in these Jeep models?
@@Garth2011they had head issues from 99 to about 2003 then they changed the head casting to fix the cracking issue. They still had carbon issues with the valves though, sometimes you could repair just with combustion chamber cleaner others got full valve jobs with new springs.
Sometimes what can cause a burnt exhaust valve is a partially plugged fuel injector. It causes the cylinder to run very lean and gets the valve hot to the point of burning a chunk off of it.
In-line 4.0 engines have iron heads and it has worn through the induction Hardening of the exhaust seats replacement seats can be put in fairly common
I'm not familiar with these engines but I did wonder if it was old enough that it had seats machined direct into the iron head. Fitting hardened seats won't be cheap, but will hopefully mean many more miles of life.
A freind of mine had a chevy truck he bought new . I heard it running and it sounded like a dead miss he said it sounded like that since he bought it. So we took the heads off and took them to a machine shop .The man said the one cylinder never had a valve seat installed from the factory.This was in the early 80s.Ran much better after we put back together.
Hi from England my friend and nice work.my XJ engine is still running great..looking forward to part 2.
Good job bro. I think you could remove the fuel pump relay and use the injector pulse as a reference for the compression test
Retired now but it was common to see exhaust valves receded that far or further on cast iron heads running on LPG in the days of leaded fuel. LPG has no lead, hence valve seat recession caused by "welding" of the valve seat to the head with no lead to intervene. Over time the seat material goes out the exhaust pipe and the valve becomes recessed. The ticking that goes with it is the valve clearance in the "lash" of hydraulic followers running out of clearance. Usual cure was to put inkonel or other hardened valve seats in the head and stainless or inkonel valves in. Since introduction of unleaded fuel and aluminium head the seats are induction hardened or in aluminium heads, hardened inserts.
I meant welding of valve face to the head.
Nice Ivan…I’m glad he approved the valve job for ‘us’! 😂🇺🇸
A Jeep that runs like shit? A real unicorn you have there.
wish I had these tools when I worked on cars. Nice work Ivan
Can you let us know if the head casting no. Is 0331? If it is - is there a TUPY casted under oil filler neck?
If not - make sure you get a TUPY unit. Non tupy are cracking, causing issues on cylinder 3 and 4
Wow, that exhaust valve is sunken deep into that head. I had a YJ once upon a time that had a soft valve seat that caused the same problem. The Indiana salt eventually rotted that Jeep away.
Hi Ivan, always good to see your videos!! Ive noticed you've shifted over to multi-part series over the last few months...did that just work out thay way from the nature of the jobs or was that a conscious choice? Thanks as always! Would love to see you and Eric collaborate again sometime!
Nice!!! Ivan is doing a cylinder head on a Jeep 4.0! Place your bets now. Will this be a 3 or 4 episode repair? Thanks Ivan for bringing us along!
Cool Ivan I kinda wanted to see the head off and your continued diagnosis on the bad exhaust valve
Replacement engine, had a cylinder head that was not correctly serviced ( el cheapo). Pretty normal. If the engine does not have excess blow by (lift oil cap at idle) and poor compression, its going through the valve seats. At least one valve is recessed back into the valve seat. Recessed valves are simply lots of miles and the head needs new valve seats or replacement.
Ivan , you are dealing with a Virginian , smart and fast decision maker, let's put it this way, after spending tons on $ , replacing so many parts and a new engine , I wouldn't take it back to my previous mechanic either !.
I wonder how many miles were on that "replacement" engine before it was installed? The combustion chamber honestly doesn't look that bad aside from that pooched valve. I have a 98 (same Jeep) with 190k on it and I just pulled the plugs to take a peek at It's heath and they are golden! I added an Accel High Energy (Hot spark) ignition coil about 30k miles ago and the difference in combustion is considerable.
Nice video of another case study. It will be interesting to see what lurks in the dark to surprise you.
It looks like it might have ingested the valve seat on that exhaust valve.
Synch can still be used by pulling a spark plug and use in-cylinder pressure transducer alongside RC. Then with firing order identify the weak ones.
Nice 👍🏼 one ! Thanks for sharing your time and expertise with us Ivan ! Can I ask you about identifying / determining the intake & exhaust valves please ? Did you use look it up in a schematic or were you able to find out by visual analysis ?
I do car my own repairs (as a DIY), and occasionally for family only. My standing rule is, if the the fuel tank is empty (or battery is spanked), I charge $25 labor, plus gas. (PS: I otherwise, don’t charge labor for family, and won’t work on anyone else’s cars).
Did someone redo that head already and put an undersized valve in it? Not sure how a valve that otherwise looks ok could sink below the head surface. I'd love to see the valve train on that particular valve. Almost like a rocker slipped off but that doesn't fully explain the valve bypassing the seat. Even with a working valve in cylinder 4 that head still wouldn't run too great given those other cylinder pressures. Hopefully a valve job solves the compression issues and it isn't leaking/stuck rings. Thanks for the video Ivan, always love to see a new PHAD's post.
That cranking sound and those codes, yikes. Cylinder 1 low compression...That's my guess at 4:21 in. :)
And again a spot on diagnostic. You are good man!
Part 1 on the title of this video was the dead giveaway of a part 2, where the customer definitely wants you to fix it!
Lotta miles for the inline, I always liked the straight 6, this looks like a rebuild that got done pretty fast, fresh head might be worth it and shouldn't be too expensive
Wow, that's a dead-on diagnosis, Ivan! I have never seen a phenomenon like this before. If it's the valve seat, why is this one so bad or is it missing? Could it be that this is a reman head and either the valve seat was not put back in or the wrong size valve was put in? I guess we'll find out in part two.
BTW, I just watched a video on replacing valve seats and it looks like it's a job for an experienced and equipped machine shop. I would hope that you can just get a new head or just replace the valve if it is the wrong size. 😊
Fascinating stuff, thanks Ivan.
I'm no expert, but it strikes me that in cases like this of very poor engine performnace, it makes more economic sense to go straight for a compression test to avoid the ignition system & fuel system parts cannon?
Cool case study ivan
Rain or shine or snow, Ivan gets it done. I couldn’t help it. I’m a mailman.
Merry Christmas lol. , going to be 18 degrees today vancouver.
bc ,.great channel 🍺🍺
Nice diag Ivan!
Hypothesis: tappet stuck, making the exhaust valve slightly leaky. This caused hot exhaust gasses erode away the valve, but not the seat. End result is a recessed valve that is (still) not sealing properly even if the tappet unstuck itself.
@@Google_Is_Evil That could very well explain it, & the ticking sound.
Lack of valve clearance would typically end up with a burnt valve rather than an evenly recessed valve seat. This looks like a material problem, like you get from running a head with cast iron seats on unleaded fuel.
Wow, what happened to that seat? Those were actually pretty good engines, but if it was a “used” swap who knows how many miles it actually has. I’ve seen a couple of these with broken piston skirts, which creates a pretty distinctive noise. Very short skirts for whatever reason. Considering the compression on the other cylinders, I would be a bit reluctant to even put a used head on it, but it is of course the owners decision. 👍👍🇺🇸
What does the frame look like with 300k mile’s on it. Ready for the crusher? Not sure I’d put more money in it.
More information about this engine would be preferred regarding age/miles however, if it was used when installed, I would rebuild the entire engine. If it was rebuilt and only had 90,000 miles on it then, the valve job seems to be a fair limit.
I know these old Jeeps were infamous for dropping valve seats. Usually brought on by overheating issues. The Jeep Liberty with the 3.7 V6 had a bad rap for that. But when a valve seat drops out, mass destruction follows. I'm not seeing that here. So, did this valve seat pound it way deeper into the head? Or did it just burn it away? Ivan, I hope you take us along on a tear down. I'd really like to see what happened here.
i was thinking the head is cast iron, there are no replaceable seats on those, the seats are induction hardened, sure you can machine them for replaceable seats, I ve seen machined/ replaceable seats come loose over time. better off getting a whole new TUPY head
Ivan, thank you for sharing the amazing work you do. Will you consider dumbing it down for us mere mortals and reduce the abbreviations and jargon? ASD ?? Etc. Thank you!
Automatic Shutdown Relay. It shuts off fuel and ignition when off, or removed. It's supposed to help prevent engine fires and hydrolocking in accident/rollover conditions.
My 97 sounded like that exhaust once, but it was because I'd pulled one of the plug wires off to get it out of my way when changing the oil filter adapter o-rings and forgot to put it back on... 🤣
Working in falling snow, that is dedication!
I would have been so disappointed (and shocked) if the owner didn't authorized you to do the repair.
Seen a valve wear the seat more than once. Olds diesel years ago, #1 intake, so bad had to junk the head, engine had 50k miles. Soft seat can do that.
Use the rubber glove trick on exhaust pipe Alvin... some people don't know that .. watch the glove blow up ...
Reman head is relatively inexpensive. You just need the right one, I think there are 3 different ones. Check the casting numbers.
Hi again Ivan. To be polite your diagnostic was correct, at 100% sensitivity there was no misfires on any cylinders which was correct which leads you bad compression if its firing correctly or am I wrong?
Regards Richard 🇬🇧
These engines are just too old.. The misfire counter doesn't work very well. Plus I think it only goes by a meter reading inside the coils.. As long as the spark plug is still sparking-- it won't read a misfire. Because I don't think these even have a knock sensor-- so it's not reading misfires in the same way as a more modern vehicle. ( I could be wrong though.. :)
@@calholliit uses the crank sensor to detect misfire. It's hit or miss... as in detects misfire when there isn't and doesn't when it should lol.
@@v12alpine Yeah.. When there's no knock sensor, your misfires are not reliable
It looks like the owner loves driving their Jeep, so I'm not surprised he or she wants you to continue the fix. Especially after driving it for four hours
😅😅😂The sound effects at 4:00 into the video. Otherwise great video as usual.
I learned years ago back in the mid 90's my neighbor had a 77 dodge motorhome with a 440 4bbl engine and it was running on 4 cylinders and when I pulled the heads the exhaust valve seats in 4 cylinders were gone but I couldn't figure out the fuel smell and I took the heads to the local machine shop and Larry called me and asked what fuel was ran through it so I called the owner and he said methanol fuel he got in the State of Ohio and by the time he got home in Pa 4 cylinders had no compression so I called Larry and told him and he said yep, you can't run methanol in any Chrysler Product, I got the heads back with a valve job done and the heads planed .015 thousands and that 440 would scream in that motorhome!!!! Let it be a lesson to all you Chrysler guys to never run methanol gas in your engines!!!!!!
as an entrepreneur you are watching the world CLOSELY and seeing what people need. Capitalism is just that; finding what people need and supplying it; and then getting REWARDED for it.
You designed and marketed that pressure transducer you DEMONSTRATED. It works with 21st century Pico Scopes to yield accurate results. Folks need to appreciate that such a transducer is subject to your production. It may not always be available so interested folks should get one will supplies last.
that 4.0 straight 6 is still the best one jeep ever built compared to all the 4 cyl and v6 engines ....i'd pick the straight over any of the other garbage engines
0331 head prone to cracking if overheated, I remember that much. The old head was 0630 wasn't it, or am I mistaken? It's been awhile since the Jeep ownership days, 12 and a half years to be precise.
Seen a brand new Jeep that ran like garbage when I worked for a Chrysler dealership.
Wonder why?
The exhaust was plugged up because someone didn't make the hole on main pipe for the 1 cylinder that it goes to.
You said they already replaced the motor. Was it a junk yard motor or a rebuilt from a reputable company? If it already is having a problem it wasn't from a reputable rebuilder then. There has to be a warranty on it if it's a rebuilt RIGHT ?
378 on the clock... The machine is a trooper.
I have just shy of 340k on a 97 XJ
Strange... Looks like the head of the valve eroded away making it appear that the valve was recessed. Hence it's weird button shape. The seat looked semi ok. Maybe excessive heat from something caused the erosion?
Can;t you use the CKP sensor for syncing the relative compression test?
No gass! That is the one thing that would set me off. I've had vehicles run out of gas while driving from the parking lot to the shop door. So sad.
looking foreward to part 2 , valve pounded into seat , valve train noise also mmmmm intresting .
Many cars will disable the misfire monitor with fuel level below 15%. It might be why the misfire monitor did not work.
Great point!
🍿for part 2
The variation of compression is too wide too, notwithstanding #4 being practically dead. New/refurb head time.
Thanks Ivan!
thank you customer for giving us closure i hate thing left up in the air
Side note… exhaust valve leaking to other cylinders with 15psi imagine a combustion event 💥
JEEP: Just Expect Expensive Problems 😂🤦🏻♂️😂
wonderin' why you don't use a differential leakdown tester set up?
Can you get actual starter current from the relay? Or is it just measuring the voltage while cranking?
I do not like the way how you did the compresión check by removing all Spark plugs 9:07 .
With all plugs out you can miss some important information as per example how about if the companion cylinder had any issues on exhaust as worn lobe exhaust flow issues normally will be reflected on the brother cylinder but with all plugs out can conpress any thing on exhaust if will be the case
Even gasoline has gotten complicated, there's 85 87 88 89 91 and 93. WTF! Here in New Jersey we have 87 89 and 93 that's it when i go to Pennsylvania the pump is like one of those soda dispensers with a million different options. A recent video from watchjrgo, he had a Chevy equinox that wouldn't run, he tried everything and was almost ready to call a bad engine, a guy was helping him and it was his sisters vehicle they even walnut blasted the valves because they were ll carboned up it being a GDI engine, she had recently put gas in the tank, after exhausting all other options they g]kept cranking the engine and it would kind of run for a second, he then sprayed starting fluid in and it ran, they decided to siphon some gas out and it didn't look right, they drained most of the gas and put new gas in and it ran, they realized that she had put the wrong gas in, this was a non flex fuel engine and she put in 85 or something, it requires 91 octane, they managed to drive it to a gas station and filled it with the proper fuel and it ran perfect, it was a 2016 model, my sister had one and it required premium, I don't think that's the case with all of them, i wonder if this ever happened to anyone else and was sold a new engine when all it was was the wrong gas. ruclips.net/video/1J4ssn0hQ6Q/видео.htmlsi=-qhUpe1KOmNrgmvH
Well done 👍
Cool diag!
Though pricey the Kwik-way seat cutter set-up is well worth it. I believe I paid $1700 plus here and there as u go.
it was 👍🏻
on Ivan! Today the jacket is not Colombia, what kind of jacket is Ivan wearing today!?)))
you're the man Ivan!