I had a similar engine failure on my 2019 with only 26k miles (thank God for waranties). I was told one of the pistons let go. Zero symptoms prior to failure. Went to start the engine, loud clunk and dead right there. Unfortunately the dealership was not interested in giving me any details for exploring why. I think they just wanted it to pretend it never happened.
Super rare, but machines are machines and given enough sample there's always outliers. But as a rule, engines rarely just blow up, something makes them blow up.
My guess is the wrist pin seized from lack of clearance or lack of lubrication and the resulting intense drag flexed the rod in opposing directions with each rotation of the crank, weakening first, then cracking and breaking it. See if you can press the wrist pin out and is the pin bore gauled? Jerry in Montana
Eeeewwww please no HDR. It burns eyeballs and it wastes battery! Love your content. I appreciate your sense of humor, sage advice, and knowledge of promasters.
I thought so too, but I saw nothing to indicate any kind of oiling issue. The bearing on the big end of the broken rod is flawless, though it does have side to side motion. I’m suspicious of the replaced head. And I’m suspicious of how much torque it took to crack the head bolts loose. But those are just guesses.
Man, I really enjoy your videos, great think you are teaching the kid, besides building knowledge, he will have memories that last a lifetime, hey, do you still have the sticker for maintenance?
I'm going to fix it soon on my 3500. Almost every 3.6 engine i have seen on scrap yard, has camshaft wear on firewall side. I'm assuming it happens because that side has less ventilation than front. Is it something that cannot be done without taking engine out ?
No. The problem is surprisingly evenly distributed among cylinders. We don't see it any more often on any one. I have a whole video on this, but it's also not caused by oil, since each cylinder has 2 intakes and 2 exhausts that have lived the same time, same miles, with the exact same oil yet only 1 goes bad. It has something to do with metalurgy or manufacturing tolerances in the rocker needles themselves.
I have a question. How do I keep water off the top of my 2022 Dodge Promaster 2500's engine? I chalked the seem on the cowl, put tape over the window gasket, and it still gets in. What the heck is wrong with the engineers who designed this thing.
If the cowl is doing it’s job, only a small amount of water gets in from the oval fresh air intake, not enough to do any harm. Make sure the cowl is sealed to the glass, and the center seam is sealed, and that should be enough.
Jeep guys throw turbos on these engines with stock rods. I must be missing something, I just know it. What if someone shot a bullet through the block? What if a ring collapsed on another cylinder and the block filled up with gas? Crazy weird stuff that I havent considered.
@@promastersonly1419 I've heard that a 10% turbo or supercharger boost will give quite a bit better gas mileage without putting an antagonistic amount of pressure on the engine. However. The cost of adding that hardware will cost more than the money in gas you'll save. Does this sound right to you?
I think it must have been Karma. The owner said something bad about the Promaster one too many times and “bam”. Not instant Karma but “Eventual Karma”. You have to be nice to them or they will leave you stranded and bite you in the wallet. ❤️😎
Possible, but not certain. If that happened I would think the thing to break wouldnt be the rod. It would be an axle or the flexplate or a valve would crash or something like that.
@@promastersonly1419 yeah it was just a guess I broke a rod in my parents caprice wagon when I was a teen by downshifting into 1st at high rpm it was a nice car chevy 454 pushrod engine with a turbo 400 tranny I guess newer cars have protections for stuff like that. Maybe there was a micro fracture from the factory on yours who knows. Too bad for the owner. Thanks for another great video 👍
I think the rod was flawed. Inspect break point. 250 hp in a 3.6L is close to the edge of the known multiverse. Down shifting on a steep hill with an existing crack in the weakest point of an aluminum (omg) rod; someone has to let go😮.
Maybe, but why didnt it break before 100k+ miles? Since I dont know, I’m inclined to blame the replaced head, though I dont have a reason to do so. The only evidence I have is that those headbolts were a lot tighter than stock. The spec is 60ft/lbs, plus 115 degrees of turn. Way less than what it took to get them out.
@@robertmorehead5771 nah. If it ate or crashed a valve, we’d see more valve damage, as the valve would lose in a contest with the rod. I went an looked closely after the video was done, looking for evidence of the piston crashing into the bottom of the head. No evidence of that. I also cant concoct a situation related to oil pressure. Like, if oil pressure got blocked to the crank bearing, that might seize the rod and make it snap. But the rod bearing is basically pristine. Somehow, the rod basically just snapped. Can it be that simple? I’m skeptical.
![โรงเรียนตอนตี 2 โคตรหลอน..!! [โรงเรียนไดเม่]](http://i.ytimg.com/vi/2MAEMwqVYh8/mqdefault.jpg)
Great job dr. Free Labor. Learn what you can from your dad and you will never be with out a job. Skilled labor is were its at.
Awesome thx... now back to the Dobro 😎
He's back! 😊
I had a similar engine failure on my 2019 with only 26k miles (thank God for waranties). I was told one of the pistons let go. Zero symptoms prior to failure. Went to start the engine, loud clunk and dead right there. Unfortunately the dealership was not interested in giving me any details for exploring why. I think they just wanted it to pretend it never happened.
Super rare, but machines are machines and given enough sample there's always outliers. But as a rule, engines rarely just blow up, something makes them blow up.
My guess is the wrist pin seized from lack of clearance or lack of lubrication and the resulting intense drag flexed the rod in opposing directions with each rotation of the crank, weakening first, then cracking and breaking it. See if you can press the wrist pin out and is the pin bore gauled? Jerry in Montana
Good lead. The chunk of rod is jammed the wristpin solid. Will try pounding it out.
Eeeewwww please no HDR. It burns eyeballs and it wastes battery!
Love your content. I appreciate your sense of humor, sage advice, and knowledge of promasters.
But dont you want to see exactly how ugly I can be, in minute detail?
Could this failure simply have been a rod manufacturing defect. In the video it looked as if there was a casting defect in the rod itself???
Nah. Engine had many hundreds of thousands of miles.
Typically when a rod breaks; oiling issue. High rpm and the rings grab. Maybe it was low on oil?
I thought so too, but I saw nothing to indicate any kind of oiling issue. The bearing on the big end of the broken rod is flawless, though it does have side to side motion.
I’m suspicious of the replaced head. And I’m suspicious of how much torque it took to crack the head bolts loose. But those are just guesses.
Thanks for jamming your rod for our entertainment.
My rod has far too much clearance.
Man, I really enjoy your videos, great think you are teaching the kid, besides building knowledge, he will have memories that last a lifetime, hey, do you still have the sticker for maintenance?
I do, and a recent video on how to get it.
I'm going to fix it soon on my 3500. Almost every 3.6 engine i have seen on scrap yard, has camshaft wear on firewall side. I'm assuming it happens because that side has less ventilation than front. Is it something that cannot be done without taking engine out ?
No. The problem is surprisingly evenly distributed among cylinders. We don't see it any more often on any one. I have a whole video on this, but it's also not caused by oil, since each cylinder has 2 intakes and 2 exhausts that have lived the same time, same miles, with the exact same oil yet only 1 goes bad. It has something to do with metalurgy or manufacturing tolerances in the rocker needles themselves.
Is there a rev limiter to keep RPMs from destroying stuff.. one would think anyway. Great video..
Yes there is. Wont rev past 3000 in neutral, fuel cutoff at 6000 in gear.
Fascinating and entertaining :-)
Arguable, but thanks!
I have a question. How do I keep water off the top of my 2022 Dodge Promaster 2500's engine? I chalked the seem on the cowl, put tape over the window gasket, and it still gets in. What the heck is wrong with the engineers who designed this thing.
If the cowl is doing it’s job, only a small amount of water gets in from the oval fresh air intake, not enough to do any harm. Make sure the cowl is sealed to the glass, and the center seam is sealed, and that should be enough.
You are Doctor Proctor, The Engine Proctologist. Haha
Turn your head and cough!
One of those super invincible rods 😂
Jeep guys throw turbos on these engines with stock rods.
I must be missing something, I just know it. What if someone shot a bullet through the block? What if a ring collapsed on another cylinder and the block filled up with gas? Crazy weird stuff that I havent considered.
@@promastersonly1419 I've heard that a 10% turbo or supercharger boost will give quite a bit better gas mileage without putting an antagonistic amount of pressure on the engine. However. The cost of adding that hardware will cost more than the money in gas you'll save. Does this sound right to you?
@@craigsmithx sounds about right. A turbo would be completely custom and very expensive.
I think it must have been Karma. The owner said something bad about the Promaster one too many times and “bam”. Not instant Karma but “Eventual Karma”. You have to be nice to them or they will leave you stranded and bite you in the wallet. ❤️😎
Very well could be. I’m a big fan of sacrificing animals to the automotive gods. It cant hurt!
@@promastersonly1419 Totally agree. I recommend nothing larger than an armadillo. It gets messy if you go bigger. ❤️😎
My guess is down shift at high rpm
Possible, but not certain. If that happened I would think the thing to break wouldnt be the rod. It would be an axle or the flexplate or a valve would crash or something like that.
@@promastersonly1419 yeah it was just a guess I broke a rod in my parents caprice wagon when I was a teen by downshifting into 1st at high rpm it was a nice car chevy 454 pushrod engine with a turbo 400 tranny I guess newer cars have protections for stuff like that. Maybe there was a micro fracture from the factory on yours who knows. Too bad for the owner. Thanks for another great video 👍
Damn kids. You loan them the wagon and they return it with a blown engine!@@21millionreasons
@@promastersonly1419 🙄
I vote rod based MMF. (aka mystery metal failure)
Maybe, but that seems like a non-answer, or another way of saying “I dont know…shit happens yo!”
I think the rod was flawed.
Inspect break point.
250 hp in a 3.6L is close to the edge of the known multiverse. Down shifting on a steep hill with an existing crack in the weakest point of an aluminum (omg) rod; someone has to let go😮.
Maybe, but why didnt it break before 100k+ miles? Since I dont know, I’m inclined to blame the replaced head, though I dont have a reason to do so. The only evidence I have is that those headbolts were a lot tighter than stock. The spec is 60ft/lbs, plus 115 degrees of turn. Way less than what it took to get them out.
With the new head.
Maybe they didn't reset the camshaft sensor position (relearn)? And the timing was micro out? 🤔
@@robertmorehead5771 nah. If it ate or crashed a valve, we’d see more valve damage, as the valve would lose in a contest with the rod.
I went an looked closely after the video was done, looking for evidence of the piston crashing into the bottom of the head. No evidence of that.
I also cant concoct a situation related to oil pressure. Like, if oil pressure got blocked to the crank bearing, that might seize the rod and make it snap. But the rod bearing is basically pristine.
Somehow, the rod basically just snapped. Can it be that simple? I’m skeptical.
Both bearings ok?
Rod bearing and crank bearing are fine. Rod bearing has a sideplay. Wristpin is jammed solid.
So Awesome to see inside pentastar.....now I have a clear picture of everything that can go catastrophically wrong! 😅
@@wrackemexcept for the valvetrain, the damn things are bulletproof.
@@wrackem its like a snuff film for engines.