6.2 failure

[Snakeboyaz]

Yeah I need to dig into it further for sure. I’ve always done all my own work from general maintenance to rebuilding the 5.3 in our 07 Tahoe and building a 408 stroker we put in my father in laws 06 Chevy. I didn’t want to have to work on a daily driver anymore which is why I bought this car so I didn’t have to worry about anything.

 

[Stbentoak]

No drivetrain warranty?

 

[Geotrash]

No drivetrain warranty?

He's at 67K. Factory powertrain warranty stops at 60K unless it's CPO or has a private extended warranty on it, which I assume he's already thought through. He mentioned above he's hoping that GM will work with him on it but doesn't know yet.

 

[Stbentoak]

He's at 67K. Factory powertrain warranty stops at 60K unless it's CPO or has a private extended warranty on it, which I assume he's already thought through. He mentioned above he's hoping that GM will work with him on it but doesn't know yet.

Sorry, On the LM2 it's a 100K warranty so I kinda thought this one was too. With proper care, there is no reason under the sun that a long time produced V8 should ever need to be replaced at 67k miles.

 

[Fless]

With proper care, there is no reason under the sun that a long time produced V8 should ever need to be replaced at 67k miles.

Yet here we are.

 

[Geotrash]

Sorry, On the LM2 it's a 100K warranty so I kinda thought this one was too. With proper care, there is no reason under the sun that a long time produced V8 should ever need to be replaced at 67k miles.

100% agree, so it begs the question if anyone yet knows the root cause of the recent failures.

 

[StephenPT]

From what I’ve read, it’s out of spec bearing clearances.

Here’s what I found from a GM Tech.

When I was at Chevy, we found a lot of the 6.2 bearing clearances were well out of spec. Pump provides the flow, bearing provides the pressure — excessive bearing clearance… oil pressure drops and the downstream bearings get starved.

Usually see excessive clearance in 1-3 and spun bearing / catastrophic damage 4-8.

At one point we had 3 new Escalades in the shop for spun bearings / rod knock or failed lifters, each below their recommended interval for first oil change.

 

[WalleyeMikeIII]

Sounds like there may have been a bad batch of bearings at some point in the production cycle.

 

[Geotrash]

From what I’ve read, it’s out of spec bearing clearances.

Here’s what I found from a GM Tech.

When I was at Chevy, we found a lot of the 6.2 bearing clearances were well out of spec. Pump provides the flow, bearing provides the pressure — excessive bearing clearance… oil pressure drops and the downstream bearings get starved.

Usually see excessive clearance in 1-3 and spun bearing / catastrophic damage 4-8.

At one point we had 3 new Escalades in the shop for spun bearings / rod knock or failed lifters, each below their recommended interval for first oil change.

Hmmm… I wonder if the newer variable displacement oil pumps are a contributing factor. Seems to be happening to folks when they’re on the highway at higher RPMs.

 

[WalleyeMikeIII]

Hmmm… I wonder if the newer variable displacement oil pumps are a contributing factor. Seems to be happening to folks when they’re on the highway at higher RPMs.

Not convinced being on the highway means “higher RPM.” My Denali sits around 1200-1400 when cruising on the highway at 65MPH.