What Could Go Wrong?? Blown Head Gaskets, Cracked Heads, Cracked Blocks... Or Absolutely Nothing??
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- Опубликовано: 2 окт 2024
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#misfire #checkenginelight #checkengine #cooling #cracked #maintenance
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Those people that thinks that will blow a gasket will absolutely pass out watching a dyno test
yes true , dyno test is under load , free pedal has no load on engine .
I was thinking the same thing.
You don't hear about it much, but many engines have blown on a dyno.
Define "many"
@@Nick-ue7iw you tube engines blowing up on dyno's .
You gotta love IGNORANCE and you can't fix STUPID.
GREAT CHANNEL!!!
Amazing what arm chair mechanics on YT will say.
Can't fix stupid...was one of my great grandfather's favorite sayings!! Oh my goodness..he would lose his mind over the clown world we're living in now!! Grandma always said "bless their heart" as if everyone didn't know exactly what she meant by it lol!! I sure do miss them but I try to teach my grandkids all the stuff my parents and grandparents taught me!! It's ruff prying them kids of the electronics! God bless y'all
That is true.
Most new cars have a rev limiter at 4000rpm if you're idle to prevent engine damage.
With poor maintenance cars you don't have to revv engine above 3000 to blow Head gasket.
A lot of cars have "rev limiters". Often at 4,000 RPM
You hit all the points.... To the commenters go home with your bag of old wives tales 😂😂😂
How is reving the engine up to 4000 rpm going to blow a head gasket when the redline appears to be 6700 rpm? That means that it is safe to rev the engine up to 6700 rpm with or without it being under load.
Car probably having problems owner undetected. All it needs just a little push then things will fall apart
Most car owners are clueless they have problems with their cars and they always say it’s the battery or a head gasket that’s like all they know. Most car owners think the battery powers the car and an alternator is a turbo 🤦♂️. They have no clue cars can have many problems it ain’t always the battery or a headgasket.
I remember a TSB on a diesel that could have improperly installed freeze plug in an inaccessible spot. It called for the engine to be cold started, once oil pressure is up, floor it to the rev limiter. Then if it didn’t blow the freeze plug it’s fine. If it did blow, replace it.
Excellent conversation and demonstration of the capabilities of a modern day motor (or is that engine?, whatever), you can rev to the rpm limit which varies by engine. Check the engine specifications to know what your specific engine does. Not you Kenny ,but the viewers. The 2008 Dodge Grand Caravan 3.8 V6 engine produces 197 horsepower at 5200 rpm and 230 pounds of torque at 4000 rpm. Kenny, is only reving to 4000 rpm, well below it's threshold. You can't hurt the engine unless it gets overheated, already has mechanical problems or exceed 10 to 20 minutes of continuous reving. On a dynamometer, you will exceed these rpms in order to get the results. Great video with very valuable explanation! Keep Wrenching!!!
That why there’s a rev limiter in park. You notice it’s not revving past 4000 that’s keeping the engine in a safe place not to be damaged. You actually risk hurting the engine more while it’s in gear than in park. Some people have such a heavy foot while driving they will hammer on the gas hard then when the engine breaks they complain the cars garbage.
Arm chair warriors would have an absolute heart attack before electronic fuel injection. The “rev limiter” back then was the valve springs, 6 - 7 grand you got into valve float and that’s all you got. Auto Service teacher held 1 of the shop cars at WOT for about a minute, exhaust pipes after the manifolds started glowing red hot.
Commercial generators you find in hospitals and distribution centres for example debunk 2 things.
This subject matter and the, "Ooooo don't drive it hard till it warms up".
Those genies go from zero to flat out the moment grid power drops out and will continue to run flat out for as long as required.
As always Kenny spot on, Gr8 vid 😎
🇬🇧🇬🇧🇬🇧
KENNY DO A LEAKDOWN TEST Louie from Meadowland😂
LOUIE! how are you my brothet?! Kate, Meg & I were just reminiscing about Ghettolands the other day 🤓
Incidentally with a 4 cylinder VW engine it is kind of common to have cracks form between cylinders in the head, especially if it had overheated, and you slapped in water before allowing the engine to cool down completely. You find it when cleaning the head prior to machining, and do a crack test on the unit. Easiest fix is a new head, or else you end up stitching it, which may work.
this video was very useful and perfectly timed since I just learned recently what free revving is and I was concerned if it was harmful or not since the internet made it sound more towards the side of being harmful to the engine
Yup, we got more than 250,000 on the transmission of 2 different Caravans. Unfortunately, I don't think that can be said about 2012 and newer with the Italian transmissions.
Years ago i had a very well built 350 sbc and made tons of money betting people i could hold 7000rpm in park or neutral and not hurt it at all made alot of quick cash that way
Absolutely! I knew a guy with a professionally built 289 sbf that would rev it up to 11000. Those old small blocks were bulletproof. Thanks for your comment! It brought back some great memories. Keep wrenching 🔧
Ever perform a crank learn on a GM LS engine? That’ll make your butt pucker. Especially when done inside a one car garage.
Lol! Anyone who's done actual field work knows the distinct smells, we also know what a lot of the fluids taste like as well. Not voluterally of course. ... I remember my first transmission fluid shower like it was yesterday!
LOL !! I've often done the "Taste Test" to verify if a leak was brake fluid ... Can't forget that taste lol
How do those people think a boat motor works or an airplane! And yes I said MOTOR!
So many people think that they know how an entire car works, after changing the oil.... And I freely admit that I don't know that much as a shadetree. But even I know that as long as you stay out of the redline (on vehicles that have a tachometer) you'll be OK regardless of what gear you're in, or none at all.
I don’t know everything either but I teach myself there’s a difference a lot of people act like they know and they have no clue.
I told everyone you have 41 years experience 😮 hope I wasn't wrong lol that would make you and I old and senile 😊. I'm just playing Mr Kenny hope this made you smile 😅
Kenny, revving this lady's grocery getter engine under no load proves nothing. Put head sealer and AT205 in the oil and call it a day. YOU HAVE BETTER CHECK THE OIL FILTER ASSEMBLY AND INTERCOOLER (just done one last week). Also some hack/con could of put oil in the overflow! Therefore put things in perspective here, change the fluids add the chemicals and move on. YOU BETTER NOT RIP HER OFF ON A REBUILD! Those head gaskets seldom blow, especially little old ladies driving them. I know your main stable is American junk but European are different. Keep the updates coming...
Social media,where people talk out of their a$$.
Thanks Kenny!!
Why would you not change transmission fluid in that amount of miles?
I bought it at 100k. It hadn't had a service before. At this point, dirt & debris is stuck in some very important places. I don't want to disturb anything at this point. Thanks for asking & watching the channel. Keep wrenching 🔧
Don't poke the bear!... If you have a high mileage transmission that hasn't been regularly maintained/serviced, you could cause more harm than good. There is more friction in the old transmission fluid that could be keeping any slippage issues at bay.
Perfectly said! Thanks for your comment & watching the channel. Keep wrenching 🔧
Gotta ignore the keyboard warriors...they don't know jack or very little and think they know everything. But if it weren't for them we wouldn't have anything to laugh at...
Great information!
Don't need to be a mechanic to see you have a low tire or faulty something. Lol
As I recall you only had him hold it around 250o rpm or so anyway.
Armchair mechanics that if you don't do it the way they know how then your doing it wrong..
I had a cracked head once that caused white smoke out the exhaust.
Have seen headgaskets bad from a bad waterpump ignored.Find the fins rotted away if metal.Plastic,find the fins broken
Murpheys Law, if it breaks, it needed changed anyway...
KENNY YOU HAVE A LOW TIRE IN YOUR DODGE!!!! LOL 😂
I enjoy your methodical approach to diagnosis. I am still striving not to get frustrated one third through a diagnostic process. You serve as a good example to the rest of us to stay calm, especially with electrical issues.
Yep, when I first started watching Kenny, I thought he was just old school. He did prove to me that he is pretty up on things and knows how to use those scanners.
@@jthonn he is old school, but very educated on today's tech
mine goes up to 5 k then the ecu shuts the fuel off
Lot of cars the computer wont let it redline
I figured you get some flack for reving that car It pains my ears to hear a engine reving like that but yea its not going to hurt it. Look at the RPM the engine turns going down the interstate for hours on end
Exactly! Thanks for commenting & watching the channel. Keep wrenching 🔧
It won't. I redline mine every time I drive. The VW was held at about 3k RPM for MINUTES...
Unfortunately this is very common due to most "facts" on the internet are nothing more than opinions from those having zero actual knowledge on the topic. Once folks learn 75% of what's written on the internet simply isn't true.
"I read it somewhere"
"My friend told me"
"I read it on a forum"
"It was on CNN"
1 of my brothers , had bought his wife a brand new Toyota Camry with the V6, back when. He always took it to the dealer for service or repairs. So he takes it in 1 time for a leaky water pump, and light overheat under 100k mileage. They changed the W.P., he got it back, still running hot. Next trip to Toyota dealer, they sold him a $600 radiator + labor. returns car, SAME hot issue, but it had gotten worse than before after they had changed the pump.
He calls me about this problem, I told him they probably didn't burp the system good enough the 1st time, and it had air bubbles trapped.....Toyota dealer again, NOW they try to sell him a head gasket job ($2,000)....In the end I go to his house, check it out, and run it to burp out the massive amount of air bubbles trapped in the cooling system, took maybe an hour+ just to be sure I got em all out.
Well, the overheating issue is NOW fixed, by my work (all I got was free dinner hahaha).....He went back griping to the head general manager, how they screwed the pooch. he got refunded the cost of the radiator only, and a "sorry" Car was fine ever since, until his wife wanted the Toyota Sequoia SUV....Traded in the Camry, I told him "Yepp how ya like your "dealer" now bro??
well said
Agree with free reving does not harm engine.
Changing all filters and oil in car keeps the car healthy and owner wealthy.
Having said that, I would change transmission oil n filter at 100,000 miles.
I remember driving on a motorway in Spain once.
Very steep decline.
4 lanes. I passed 3 other cars all with their brakes applied trying to slow their cars.
I in a manual shift put car into 3rd gear and let the engine rev itself at 3500 RPM.
Wheels turning the engine into a compressor. I did not need to apply brakes,and was in full control of the car.
As my driving instructor told me 50 odd years ago, you go down a hill in the same gear you would use if you were going up the same hill.
Manual g boxes are great for giving you engine braking.
When i first got my 02 Saturn SC2 5 speed i was able to exceed the 6500 redline up to about 7250 in 3rd (83 mph). I was trying to find the limiter or fuel cutoff but never found it. When i tried a 2nd time it wouldn't go above 6500.
Those who say free revving will hurt the engine sure never have had to set timing on an engine. They'd completely freak out at the race track.
Now revving Harleys on a cold engine can very much blow the head gasket due to thermal expansion differences.
With poor maintenance it will hurt
@@1Jomarcel your deserve what you tolerate.
I drive a diesel. Once a week or so I blast it up to the rev limiter at 5000rpm or so to clean ou the injectors. It has had a top end rebuild but that happened because some fool (me) managed to,damage a small coolant hose.....
Leak Down Testing.
Use your preferred method of clocking each piston's TDC, I learned to love an old school combination vacuum/pressure gauge, like for carb'd fuel pumps connected through an air hold.
As a piston moves up (with closed valves, compression stroke) low pressure will build, dissipate. Hand crank until vacuum shows, rock back & forth pressurevacuum like it's a dial indicator over zero.
To minimize hand cranking, test in the firing order, you're done after two full crank rotations.
Grab some latex/nitrile gloves to use as balloons, balloons could be good too.
Remove the intake duct from the throttle body. Tape a glove/balloon, as air tight as you can, over the throttle body.
Tape a glove over each tailpipe.
Tape a glove to a crankcase breather, get creative.
Remove the cooling system pressure cap, tape a glove.
Have a stethoscope handy, or just a length of hose for listening inside cylinders adjacent to the one under test.
Why go through all this? To get advance information regarding an engine's upper end internal condition prior to removing its head. If you should happen to find crankcase leakage along with head leakage, isn't time to estimate a complete engine rather than pulling a head?
In the Passat's case, you expect leak down test pressure to show in the cooling system (I don't), if it does show there, you know where to scrutinize closely for cracks.
Should you hear cross talk between cylinders, assume a warped head (and possibly cracked head and/or block) until you can confirm or reject that assumption with a straight edge.
Signed,
CLT D'Vivre
Yep! That smell, drove another 100 000 km with that smell, so it depends if you want to drive it to death and throw away or change the gasket ASAP. Had to change water pump, as with blown gasket original one got corroded and started to leak.
Your are a young man I have I have owned my shop when full service gas pumping was alive and the epa did nothing. I'm going side 1976 and in retiring in December.
Engine rev range is there to use. Yes high revs in drive with brakes on will heat up the trans fluid fast, but most modern ones will very rapidly tell you trans overheat, and limit engine RPM. Driving in my car there are times it will be sitting close to the limiter for a few seconds, then I will change gear, because torque peak is high up, and power peak is somewhere around there, so use them when you need to. Long term not great to run there, most engines are designed to run around half the rev range, but are fine with the occasional spirited drive cycle, here called a free State tune up, because it causes peak pressures in the cylinders, and does a bit of work to clear out carbon build up inside, and on the exhaust side. GDI it does nothing for the inlet side, that you still have to clean.
Howdy Mr Kenny hope you're enjoying your weekend even though Monday is right around the corner 😅😊
That’s awesome I remember as a kid when a buddy got a few wobbly pops in he would rev his small block Chev like a motorcycle, like every day seemed like lol, would cringe waiting for a rod come out the side but nope never blew up just eventually turned into a oil burner lol
Yup, that will happen. Thanks for commenting & watching the channel. Keep wrenching 🔧
I’m a retired engine design engineer & program supervisor. The principal danger to components in an engine that is revved with no load is to the connector rod assembly, specifically the connecting rod bolts.
Think about the loads imposed on a rod bolt (or stud). You have rotational forces trying to stretch the bolt and decrease the clamping load on the joint. Free revving the engine means the engine is making zero bhp - the engine is producing only enough power to overcome friction. When you load the engine, combustion pressure is pushing on the piston crown and opposing the stretching forces on the rod bolts caused by rotational forces.
4,000 rpm won’t be a problem, but I wouldn’t want to be around an engine being free revved to, say, 7 grand.
I recall as a kid going to grudge night at the Atco NJ drag strip. The hot cars were virtually all manual transmission vehicles. There were plenty of blown engines, and they almost always happened at the shift. High revs, and suddenly the engine is unloaded as the clutch is thrown in to make a shift - and boom.
@@stevenslater2669Makes perfect sense. Im under the belief that if you want your engine to last, don’t make a habit of running it at red line. And I never free-rev my engines, especially in my motorcycles.
too many of the commentor's never put arear end in there car , but do put there rear end in the couch and comment nonsense .
Entropy at it's finest
Original transmission fluid at 250k!? 😮
Does it smell like varnish yet?
Yeah, I get your point Kenny, but if you take Aunt June's clunker that is running on 8 oil firing plugs and an inch of sludge, it will throw a rod right now.
Never heard of such.
why do your videos stop start at various times throughout don't have any probs at my end and no its not playing on the down load it's something to do with your videos also just wasted my time asking you as you DON"T answer questions or leave a thumbs up to any one Cheers
Likely it's due to him getting ready to show us something and it's his way of showing by stopping on his face and then restarting on the what he's ready to show. It's not an issue. It's just his way just as "What am I working on today" is his signature line.
You need to go back to your optometrist. Evidently your glasses don't fit well because you constantly push your glasses back at the nose piece. Or is it just a habit?
Dude, leave Kenny alone.
I'm an eye doctor. Pretty sure Kenny just has readers so he can see what the camera is doing and see his work in front of him. He looks over top of them to see far away when driving.
I'd heartily recommend getting some bifocals. It's the right tool for your job. Readers are like trying to fix a car with pliers.
To the guy that said leave Kenny alone. There's no problem in making suggestions. The other guy is right. Get some frames that fit. I'd suggest Oakley ophthalmic frames. They just work.
You have no doubt heard of perspiration, anytime you temperature and humidity levels get high, your glasses will regularly slip( or slide) down the bridge of your nose as it is gravity at play.
@@billmalec Better than bifocals is multifocals.
@@SeanBZA you think I don't know what they are? I was using a generic for the crowd. 😉