How Do You Destroy A 4.0L Jeep Engine THIS BAD? Intentional? Neglect? Ill-Repair? I Am IMPRESSED!
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- Опубликовано: 29 сен 2024
- For parts please go to www.Importapart.com or Email us at Importapartsales@gmail.com.
What the! A Jeep 4.0, in this condition? HOW! These engines are supposed to be bulletproof! However as we've seen on this channel, people can and will destroy everything including engines we deem indestructible.
The 4.0L is based on the old AMC 4.2 258ci, which was also a VERY good engine. The 4.0's suffer from some common issues mostly related to poor castings, but are overall regarded as one of the most reliable engines of all time. They are one of my favorites, but I still sell these engines for a reason. This particular core is from a late WJ, I believe a 2004 Grand Cherokee. These late 4.0's are probably the least reliable. I have never seen this kind of damage on such a low stress, low compression engine. How does this happen?
Why am I doing this? I own and run a full service auto salvage business called Importapart, and part of our model is dismantling bad engines to salvage the good parts to resell. We do not rebuild engines, merely supply parts to those that do.
I really hope you enjoyed this teardown. As always I love all the comments, feedback and even the criticism. Catch you on the next one !
-Eric 
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I have a 2001 XJ and it has been rattling for eight years, so bad I tell people that it's a Cummins swap. I paid a mechanic to drop the oil pan and take a peek. He couldn't find any loose so he buttoned it up and said to just ignore the rattle and keep driving it. That was eight years ago.
Good chance that rattle is the exhaust manifold. When they crack (and they all crack), it'll rattle like a diesel.
Rocker arms
Flex plate issue. They Crack and starts to tick.
Good to see an uncomplicated old style basic engine that anyone could work on without a shop full of electronic gadgetry and specialist tools..
Not too unlike the old Chevy 232 inline 6. I never liked the timing gears on those, though.
Wish is was still like that.
"Can't start in the back. That's how you get an infection." I laughed WAY too hard on that one!
What video is this referencing? I’m waaayy behind lol.
@@dbsranchr s*x
@@205rider8 oh shit…… I’m such a dumbass 🤣🤣🤣🤣
@@dbsranchr took me a minute... not gonna lie.
Yeah i had to stop, go back and replay ... it's a good thing this channel doesn't have many young viewers "Daddy why do you get an infection if you start in the back"
For a piston skirt failure, that one actually seems pretty tame. Usually the piston comes apart and the wrist pin hammers into the block until it either makes an inspection port or it seizes.
Yeah, that was VERY surprising the wrist pin didn't go sailing and lock the engine up.
"Makes an inspection port" lol that's a hilarious way to look at it.
No it doesn’t
@BB Sky it doesnt, which is exactly the problem. The piston around the wrist pin comes apart, and the rod starts hammering it into the sides of the bore until either the engine gets an inspection port, the rod lets go or the engine seizes.
@BB Sky, pins are pressed in by heating the rod. They can become worn over time and walk themselves out.
Got a 2001 Cherokee with 263,000 miles original motor daily driver rig. Impressive to see what abuse these motors can take til they let go.
Had a 95 GC with the 4.0 with 325k when I sold it. Only problem I ever had with was the water pumps shreading every 20-30k miles. I got very good at that routine maintenace.
Since that engine development was started in 1956 by Nash, then it was made by Hudson, then made by Rambler, then made AMC, then made by Chrysler for Jeep…
After 50+ years, they better have figured out how to make it work right!
The 4.0 actually was based on the 232 first put in 1965 model year AMC’s, and shares nothing with the earlier 6 cylinder engine.
@@nuttfarmgarage6434 Just to pick a nit, according to Wiki the new 232 was introduced in May of 1964.
@@JeffDeWitt What part of 1965 model year do you not understand?
@@nuttfarmgarage6434 the early engine was changed repeatedly to make improvements. Just 'cause new parts don't fit old junk doesn't mean the whole thing is different. One step leads to the next, and you can't get to the top without climbing the steps.
@@brandonupchurch7628 Last I looked 1964 was before 1965. The 232 was introduced in the special edition 1964 Rambler Typhoon. The article in Wiki even has a picture of the car and the license plate says "1964".
Eric, Merry Christmas to you and your family. Thanks for taking us along with you this past year. I’ve enjoyed your videos, your humor and presentation style!
Eric, when you disappeared off screen pulling the cam, I expected you to edit it to look like the cam kept going on forever, you know how a magician pulls the endless handkerchief out of his hand,
It was fun to watch, just kept coming out.
We're just so used to seeing only 4 cylinders with worth of cam emerge from the engine.
Definitely not replacing one with the motor still in the body, without removing a whole lotta' stuff first....
That was some impressive damage! Great video as usual. There’s a couple 4.0’s in my driveway.
👍 thanks for making me feel better about my 4.0 with 319k miles on it! It's had a oil leak on the last 2 cylinders coming out the head gasket for about 60k miles. It's always been on my "I'll get around to it..." list.
The problem with these is the pistons crack (mostly starting in 95ish, the later, the more likely) and the non TUPY 0331 head casting used 99 on wj and 00-02.0 on all models is known for cracking randomly. Flawed casting, basically if you overheat it it'll do it but every time you heat cycle it, even to normal running temp, you roll the dice. The 02.5-06 TUPY 0331 head casting mostly fixed it.
The crack will form on the top of the head between the #3 and #4 rocker mounting bosses.
That block is probably still worth a little to someone building a stroker for a 00+ TJ or any WJ since they'll be overboring anyways, but otherwise I'd scrap it.
First 2 causes that jump to the top of the list:
1. Hydrolocking
2. Overheating
Clearly it was over heated. Bad 🔥
My uncle bought a Govt. Auction F250 from the Border Patrol with a seized triton v10. He swapped it with a Napa Crate rebuild and a Mitsubishi D-50 transmission. I shit you not, 18 years later and at least 300,000 miles later, that truck still runs to this day.
I recently bought a 06 tj one owner no accidents 7k miles. The engine is soo smooth I love it
I had a 4.0 in my 02 wj that cracked the skirt off the number four piston at 103,000miles. Lucky I noticed a change in the engine sound and shut her down right away. I ended up rebuilding the engine for about $600 in 2013. Put another 20k on it before I traded it in for a jku in 2015 that I still have. I loved how easy that engine was to work on.
Had one of these engines run on 0 water, started knocking. Let it cool and added water. The knock was gone. That was 3 years ago, she's still running fine
I put over 330,000 miles on my used, 1997, Cherokee Sport with the 4.0 ltr/6 cylinder. The same short block that was in my 1961 Rambler; I worked at a Chrysler Jeep dealership in 1991 when I got out of the NAVY. I still miss that Cherokee, it ran strong when I sold her even with more than 359 k miles.
Somebody sponsor this mans supply of brake clean!
Love the teardowns keep it up.
Sometimes your videos are so therapeutic I fall asleep to the sound and then go back and rewatch what I missed when I wake up 😅😂
Just lost my 1999 XJ, transmission died on me at 279k. Completely agree with your comments on the 4.0L; they're indestructible.
I have two XJ’s. 1996 and 1998 with 201k and 178k miles. Love them.
They fixed it with adding the flex pipe on the manifold and it helped a lot I always put a borla header on all my 4.0's I had a 89 xj4.0 bought a canceled performance computer for 50 bucks because it was a canceled part the year before cost me almost 500 it was ported had throttle body spaced cold air intake it moved I did 16.4 in the 1/4 mile with 32 inch bfg mudders I have the video I put that motor in a 2wd mj and smoked mustangs all day long ended up building a 4.7 stroker and it was bad ass the AW4 auto was the best transmission
The timing chain actually looks ok, thumbs up, great video
5:39 It looks like it wouldn't be overly difficult to bolt a carb onto that intake manifold....
ITB EFI?
"Chunky oil is not good oil."
Yep, belongs on a t-shirt, lol...
Thanks for showing the Jeep 4.0!
I try to take pan off and not flip it over to keep debris in pan.
Excellent channel 👍
Cool you help people.
6:19 If they don't crack, they warp. The Ford 300 does the same thing for the same reason. My 85 F150 will have an exhaust leak for as long as it retains the factory exhaust log because it's so badly warped #1 exhaust port will never even attempt to seal. It's a good thing I don't really care about exhaust leaks haha
Replaced a 4.0 in my 96 xj with 370k. #3 piston decided it was tired of being a piston. It was really loud but surprisingly wasn't missing and still ran. Up till then, didn't use much oil (maybe 1\2 qrt every 5k). I used mobile one in it from when I bought it at 90k (don't know if that made any real difference). Didn't pull engine completely apart but visual with the pan off showed surprisingly little wear. Lobes didn't look to bad and hardly any play in the rod bearings. The little bit of cylinder wall I could see still showed some crosshatching. It would still be going if not for the one piston letting go.
I had one of these that was running with a rocker that came loose and punched a hole in the Valve cover. It was running on the remaining 5 like a champ though.
My best guess would be that this motor got torched by the incorrect AFR due to NOS boosting.
I'm a retired mechanic. In my many decades of wrenching the two engines I've seen disembowel themselves with the most frequency are the Small block Chevy and the Jeep 4.0L. I'll never understand where that engine gets it's 'Bullet-Proof' reputation. They are definitely reliable. But far from bulletproof. I have one in my 2000 WJ. Reliable, dependable. Gutless, gas hog. I'm currently rebuilding an AMC gen-III 360 V8 to swap into it. I also have an AMC Eagle with the 258 engine in it. The 4.0L and 42re, from the WJ, will eventually go into the eagle. And the WJ will get the 360 with a 46R or possibly a Ford AOD. Not sure yet. . . . Anyway, 🎄 I hope everyone has a Merry Christmas and a Happy New Year 🎄 . . ❄ Greetings from Alaska ☃
My buddy had a TJ with the 4.0 and a 5 speed and sold it with almost 350k miles and still ran great
I bet that engine was a 2001-2002. Those were the years Chrysler went cheap on the piston alloy and they were known for destroying pistons. That block is an excellent candidate for a 4.7 stroker. It'll need boring, but there are a lot of machine shops that can handle it. It would need a TUPY or Edelbrock head, and 250/258 cam.
I replaced the pistons in my 2001 as soon as the piston slap started instead of letting it get that bad. Dingle ball hone, sealed power pistons and it's still running.
I could stand there taking engines apart all day long. Just tear down and skip the reassembly, count me in any day. That's a dream job.
The dipstick! It's a Christmas miracle!
I am in Australia and an ad popped up for a Jeep Grand Cherokee. Karma.
thanks you for doing this awesome tear down. im a xj guy and love these engines.
Hey, you answered my question about where the milage was stored on the Corvette. You are amazing!! I love to learn and you are great at educating.
That is some crazy piston damage
Just bought an 01 XJ with almost 400k miles. And aside from a few oil leaks, it's in very good shape.
9:53 Eh. If it was an older carburetted one, yeah, it'd still run. Given its vintage there's a non-zero chance the computer said 'uuuh no' and cut spark.
Going through my 88 and keep finding things to replace lol.
I knew one that ran on what ever lubricant was left over in the shop that week. It survived a year like that.
Rebuilding a 2000 Cherokee 4.0 right now , # 2 piston cracked , harmonic balancer broken , bent crankshaft. Nope didn't overheat.
The AMC 4.2L was the almost indestructible Jeep 6, also know as the small block Chevy of 6 cylinders. It wasn't until Chrysler got a hold of it, reduced it to 4.0 and turned it into another MOPAR slug that it was never the same. Nobody understands "If it aint broke, don't fix it"
Im new to your chanel, enjoying everyone of your videos. I loved rebuilding engines in my younger days and may rebuild my 4.7 in my 2000 jeep wj.
Never had one of these Injection 4.0 engines....only every drove a 4.2 in my AMC Eagle. The 4.2 never ran good, but it always ran.
1997 Cherokee Sport 4.0 6cyl, I had wwll over 330k miles when I sold mine; best car I Ever owned.
Great tear down, Merry Christmas!
casting sand , was hell . i worked at jeep dealer in '99. the shit would eat the impeller from water pump and clog everything
had one and loved it. great vid
I want to see you tear down a SAAB B204.
Those engines are pretty good if you change the oil on time and handle stupid amounts of power on stock internals.
Most drivers, dont understand that warming up the engine is paramount !
They crank the engine and drive top speed.
2 min summertime and 5-7 min wintertime, will save lots of money. Plus the oil change every 5-10,000 km depending of the year mfd.
Decently quick in a Jeep XJ and they sound so good 👌
Now we're on the topic of 4.0 I6s, you should try getting your hands on a Ford Australia 4.0 I6 😉
I didn’t think I would see a 4.0 jeep on here. I know these engines inside and out and they are awesome! But they do not like heat.
When you get to the 4Ls that have no distributor- just the 6 coils it's nearly impossible near me to find one intact. However you can at any moment locate 6 jeeps (usually grand cherokee) in need of a fresh 4l. Almost all have the side window feature and self draining oil pan as well, with or without external connecting rod. Don't know how chrysler managed to weaken the piston skirts and or wrist pins to gaurantee they all grenade by 175k but they sure did. "OH they all tick on startup even from new" yeah no that's the slop in the wrist pins having the pistons clang around in the bore until they warm and swell up enough. So really around 98ish, later in the wrangler that 4l became a liability rather than a feature. Just more chrysler garbage at that point.
That Jeep 4.0 looks very similar to the Australian 3.3 from GM Holden 1972-1982
Luckily ax15 manual swap xj is fairly easy and would look oe. And 4 doors sold like wildfire.
I have a total rust bucket mj, but it's a unicorn. 89 pioneer with the ax15, 4wd, working clock, smoker windows, factory Cruise control... I would rather it rust away than sell it. Slowly restoring it and fixing the rust, tempted to HO head swap it
But the "anti-sieze" in the oil pan helped it to turn over. L0L I like your non-verbal (or sound effects) observations. Another informative and entertaining production. Thanks!
the 4.0L were compatible with AMC 232 inline 6 and 258 inline 6
Had a 2000 XJ and then a 1998 XJ. I bought the 98 with a blown head gasket (early stages just sucking down coolant) got about 20k then swapped the engine out due to who knows how bad I fucked the block. Next one I put under water three times and blew out the cylinders. New plugs and oil and she fired right back up and got another 150k before I sold it
Another excellent video, good job! Have you considered doing a series on putting some back together?
That block is very much like me. Pissed N Broke.
Did you prep that dipstick tube off camera??? I call BS!!! lol
My favorite engine is BMW M70 (S3/2/) mind in tearing down this one ? V12
Love your tear downs ! Great shows
Luckily cause could be fuel boosters or a nitro base additive?.
It would be nice if you could some day take apart the Toyota 4.0 liter V6 (1GR-FE) found in the 4runner and others. It's supposed to be a super reliable engine so I don't know if there are many out there to find.
I have a bad one! It’s just still in the truck. Future teardown for sure
The inline 6 cylinder is making a comeback in general. Just maybe not this one. Just developing the inline 6 between 3 and 4 litres.
Enjoy your content. You are the coroner of deceased engines. Interesting postmortem.
Would love for you to do a 2.5L V6 out of the IS250
Think about it, it make one hell of an aircompressor
pleses do a a 6.9 idi and a 390 /360 fblock and 95 and up 7.5 that would be so so cool thank you i have had all the engine in all my trucks
Curious what people think about the nuts that were bouncing around the engine... Cause or effect?
IE: They were not tighten when previously taken apart. OR Somehow the failing of the pistons backed them off... ?
I suppose unrelated could be it as well.
@6:46, do I see a few lichens/mushrooms in there? On the left, the little yellow stuff.
That dipstick tube had no honor.
Been waiting for this one
ERIC YOU WOULD HAVE BEEN A REAL GREAT PROCTOLOGIST !
Dude, older 4.0 Jeep 1987 ish, 1987 3.8 buick, ford 2.4 tempo engine. Bullet proof, all of them.
I'm in the middle of swapping out my '02's WJ 4.0, due to a failed piston skirt on Cylinder 4(a known issue on the '99-04 4.0's due to them cheaping out on the material the pistons were made of. Can't say parts stores are still keeping parts in stock, as it recently took me 3 different stores to come up with 6 spark plugs. I will admit that the engine was severely overheated about a year and a half ago, when I left it idling at work while I plowed out my parking spot and the radiator tank blew, and it idled until it stalled before anyone got my attention.
You say these cores have value, any place in the northeast buying them? I've got 3, including the 1 that the piston skirt came off(drove 45+miles like that, and haven't seen the bore to even know if it's rebuild-able.) I also have a 97k mile spare that will be going in, and another 250k+ spare engine, that ran when parked.
You had a lot better luck with the dipstick tube than I am having with the spare, as the dipstick handle is snapped off just below the top of the tube, and I can't seem to get the tube to even budge.
As far as the coil pack on these engines go, there is now an upgrade to using a viper coil for under $200, that adds in spark plug wires, so you can enable/disable cylinders for testing, and it also alleviate the expansion/contraction of such a long block causing cracking internally of the factory coil pack.
What you called the cam position sensor is actually the cam syncro. The cam sensor screws on top of it and was already missing.
lean out. check the O2 sensors see if they were working right.
Some 4.0's do ha e water coming out of the rear hole
You talk so good about that 4.0 but you don't talk about the leaking rear main seal and the ever so unreliable electronics....$2,500 DOLLARS WORTH OF ELECTRONICS AND A LEAKING MAIN SEAL AT 15,000 MILES....My 2005 Wrangler is plagued with both....
You can buy every piece of electronics that run this engine for less than 1K
Can’t say that about most engines.
Rear main seals leak on tons of engines, hardly a 4.0 thing
Have you done a 2007ish Chrysler 3.8 yet? Pacifica and Caravan motors. I'll search, but I'd love to see one if you would.
“Rocket surgeon” LOL
“Religious piston” it’s holy. 10/10 dad joke
HI PLEASE CAN YOU EXPLAIN WHAT IS HIGH MILES ON THIS ENGINES,,THANKS FOR THE GREAT VIDEO
I'm sure it's a lot easier to work on, compared to the 2006 fird 4.0 SOHC. LOL Stay away from the fird 4.0! It's a nightmare! After all the work I did on it, I guess I know how to rebuild one at least. LOL
I had a Gremlin that had that engine. I sold it to a guy I worked with, since the alternator went out on me, and I was getting ready to PCS from Guam. He tells me he needed the cam. So he fixed the Jeep he was working on and told me he wanted his money back and wanted to give me back the car. He said he decided not to use the cam from my car, but it didn't run when he put it back together. But the Jeep ran fine. I called his lie. LOL
BTW I spelled it fird on purpose. LOL
Piston slap! Had this happen to me.
I have friend same engine 2001 grand Cherokee 4.0. That engine is best. Still running smooth. Anyway. That post video engine telling been overheat I meaning that engine blew very high overheat crazy. But I know the problems 4.0 engine has electric radiator fan there no clutch fan. The problem is electric fan is heavy amp make wire get hot then shut off itself until engine over heat. So. That grand Cherokee had V8 i did look at they had clutch. Why they didn’t put fan clutch on 4.0 it better than electric fan. That company factory duh. So I did change to my friend grand Cherokee heavy duty clutch fan. And turn off electric fan. Then never had issue. I love that engine. Now I don’t know why no longer I-6 engine make.
My friend has 2001 4.0 has many problems with over heat due electric fan fail often. So I look at V8 has clutch fan so I order clutch fan to installer on water pump. And remove electric fan. Then has no issue. Engine still best.
The engines themselves are bombproof, it's the electronics and junk sensors that bite you in the ass
One should be able to put a carb and a distributor on this, I mean the camshaft has the worm gear drive for it and the block has the hole.
Every 4.0 iv seen blown its always cyls 3 and 4 wrist pins locking up
I'd like the 6 piece Pistons McNuggets with fries and a large coke please!
one could suspect they boosted it and when it broke they put the na system back before gt rid of it? as i cant look away on we know this engine might been bubbah tuned
why did those nuts come off? vibrations?
NOS oxide . Perfect for melting pistons.
14:43...Piston McNuggets!