Yukon 2022 6.2 engine died at 75,000 miles.

[Matthew Jeschke]

I'm getting to this a bit late in the thread. Probably somebody already posted this but GM did a recall on these vehicles.

Manufacturers are pushing the viscosity too low! There was a recall and if the motors hadn't blown up yet the solution was to simply run higher viscosity oil. I don't recall exactly what viscosity it was. The problem is that low viscosity doesn't have enough film strength to suspend the metal contaminates that all motors create. It also doesn't do a good job of hydraulically floating the crank as it is intended to do. It ultimately tears up the bearings and the motor goes. About the only thing low viscosity oil is good for is, decreasing load from oil pump... aka a small improvement in gas mileage.

Another case of US EPA regulations pushing manufacturers in stupid directions. Also don't go so long between oil changes. I'd change at most every 5000 miles.

Wish I could drive like you can there! That sounds fun!

 

[Matthew Jeschke]

By the way, the inserts are the same. German ones, but they didn't go 1-10-20 thousand miles for me like everyone else, but 75,000 miles.

Well, are you ready for new horrors?))) The oil is to blame?) or fuel pollution?)) My new engine was disassembled, and there was this. Its mileage is 0 miles

Looking at photos of your bearings. Just for perspective, I tore down my engine a 5.3L LM7 from 2001 with 230,000 miles on it. I could still see the part number engraved on the bearings. There was very little wear on them as if the oil does it's job then it suspends the tiny tiny metal particles in it. And second it hydraulically suspends the crank and rods so they there's little if any direct contact with the crankshaft. When they go to too low a viscosity it diminishes the oil's ability do hydraulically suspend the crankshaft.

This guy gets into the nerdy details here:

 

[Vladimir2306]

I'm getting to this a bit late in the thread. Probably somebody already posted this but GM did a recall on these vehicles.

Manufacturers are pushing the viscosity too low! There was a recall and if the motors hadn't blown up yet the solution was to simply run higher viscosity oil. I don't recall exactly what viscosity it was. The problem is that low viscosity doesn't have enough film strength to suspend the metal contaminates that all motors create. It also doesn't do a good job of hydraulically floating the crank as it is intended to do. It ultimately tears up the bearings and the motor goes. About the only thing low viscosity oil is good for is, decreasing load from oil pump... aka a small improvement in gas mileage.

Another case of US EPA regulations pushing manufacturers in stupid directions. Also don't go so long between oil changes. I'd change at most every 5000 miles.

Wish I could drive like you can there! That sounds fun!

No, the recall action will concern the repair or replacement of the engine, and the transfer to 0-40 oil is just so that the cars reach the end of the warranty. But, just today we discussed with the service that the transition to 5-30 or 0-40 oil puts the lifters out of order, as it was on the 6.2 of the last generation on a mileage of 90-100 thousand miles

 

[Vladimir2306]

Looking at photos of your bearings. Just for perspective, I tore down my engine a 5.3L LM7 from 2001 with 230,000 miles on it. I could still see the part number engraved on the bearings. There was very little wear on them as if the oil does it's job then it suspends the tiny tiny metal particles in it. And second it hydraulically suspends the crank and rods so they there's little if any direct contact with the crankshaft. When they go to too low a viscosity it diminishes the oil's ability do hydraulically suspend the crankshaft.

This guy gets into the nerdy details here:

I believe that the reason is not in the oil or liners. The reason is something else, which makes the engine work without oil at all. Some kind of error, or a malfunction of some sensor. And in these conditions, it does not matter what kind of oil it will be 0-20, 0-40 or 75-90

 

[Kaminski]

Vlad - The defect is in the crank and wrist pins. If you keep the stock parts for these you will have issues again as your new engine was built before the cutoff date.

 

[Vladimir2306]

Vlad - The defect is in the crank and wrist pins. If you keep the stock parts for these you will have issues again as your new engine was built before the cutoff date.

No, we have already moved over this engine, the main defect is small temperature gaps. With a norm of 0.048, they are actually 0.02-0.03. The piston jams in the cylinder. And the connecting rod liners simply take on shock loads and fail

 

[Kaminski]

No, we have already moved over this engine, the main defect is small temperature gaps. With a norm of 0.048, they are actually 0.02-0.03. The piston jams in the cylinder. And the connecting rod liners simply take on shock loads and fail

Ah. So bearings too tight? Just don’t want to see your engine go down again when you might be able to avoid it by fixing now while engine open. Looks like you have really good mechanics though. Thanks for sharing and keep the pictures coming! Really helpful.

 

[Blackcar]

How many of these engines do you think they have taken back and went thru them with fine tooth comb.

They have rebuilt same engine and put them in vehicles ran thru all different kind of driving circumstances they have a plan, and they know what is causing most of these failures. This isn't GM first rodeo.

 

[Vladimir2306]

How many of these engines do you think they have taken back and went thru them with fine tooth comb.

They have rebuilt same engine and put them in vehicles ran thru all different kind of driving circumstances they have a plan, and they know what is causing most of these failures. This isn't GM first rodeo.

I don't know if they will handle old engines. In our experience, 9 engines out of 10 need to be improved, such as we are doing with my new engine

 

[Vladimir2306]

The next day, the engine was assembled and installed in the engine compartment.

 

[Vladimir2306]

More photos

 

[Vladimir2306]

And more

 

[Scarey]

I think it’s called blue printing, take everything to blue print specs. Anybody in the us ever explored that option?

 

[Vladimir2306]

I think it’s called blue printing, take everything to blue print specs. Anybody in the us ever explored that option?

I don't understand what you're talking about

 

[Scarey]

Dismantle the engine and take everything to as exact dimensions as the original drawings, blue prints, specified

 

[Vladimir2306]

Dismantle the engine and take everything to as exact dimensions as the original drawings, blue prints, specified

Why dismantle it? It is just being installed after the engine from the box was redesigned clearly according to the drawings and GM standards, since the new engines do not meet them.

 

[Scarey]

Why dismantle it? It is just being installed after the engine from the box was redesigned clearly according to the drawings and GM standards, since the new engines do not meet them.

I think there is a failure to communicate. You’ve indicated your making improvements to a brand new engine because of manufacturing defect, crooked hands I think you called it. I was making a general question to the forum population if anybody has explored blue printing as an option.

 

[Vladimir2306]

I think there is a failure to communicate. You’ve indicated your making improvements to a brand new engine because of manufacturing defect, crooked hands I think you called it. I was making a general question to the forum population if anybody has explored blue printing as an option.

Apparently yes, my English is probably not that good, and I don't understand what blue printing means. Here's what Google (blueprint) found – a detailed plan or diagram that describes the structure and functionality of the future system. Is that it?

 

[justchecking]

“This isn't GM first rodeo.”

Being an old retired engineer, my suspicion is that the new generation engineers knew it all already and the culture was that senior engineers didn’t make it to senior managers, accountants and retired military colonels with history degrees did, and so yes this IS GMs first rodeo all over again.

 

[justchecking]

Dismantle the engine and take everything to as exact dimensions as the original drawings, blue prints, specified

That is exactly what Vlad and his team are doing.