6.2 engine destroyed 25000km

[MaverickZ71]

10 hours ago, brendon444 said:

Looks to be known issue.

 

Condition

Some customers may comment on a malfunction indicator lamp (MIL) on and/or an engine misfire/tick noise.

Technicians may find DTC P0300 set or in history.

Cause

This may be the result of an active fuel management (AFM) lifter that is mechanically collapsed and/or stuck all of the time.

 

This may be the result of internal locking pin damage in the lifter, due to oil aeration.

 

This may be the result of a lifter that has collapsed and is stuck in the lifter bore.

Correction

Note: Inspect the camshaft for damage while the lifters are removed from the engine. If damage is found, replace the camshaft per SI.

 

If SI diagnosis does not isolate the cause of this concern, technicians should inspect for valve operation.

 

If the valve(s) are not moving, replace the valve lifter oil manifold and affected bank of AFM lifters. Refer to Valve Lifter Oil Manifold Replacement and Valve Lifter Replacement in SI.

 

If the lifter has spun the bore, the guides should also be replaced.

This confirms what I have been afraid of.  The new generation of engines for the GM 'light duty' trucks have the same AFM problems that the GMT 900's did.  I have asked the new owners on here from time to time, and most have said NOOOOO, the new engines are completely different with no AFM trouble.  I'm calling BS on that! 

[8lugCT]

HD trucks for everyone

[brendon444]

30 minutes ago, Donstar said:

I chuckled when I saw op's choice of signature picture when thinking about his engine issue.  There is still lots of warranty available and he can expect many more miles of trouble free, "normal" driving.  

It's a daily driver and not driven hard, not a track car. Regardless should not have to tear into a motor with 25000km.  

[sdeeter19555]

It's a daily driver and not driven hard, not a track car. Regardless should not have to tear into a motor with 25000km.  

It happens, have it repaired and move on...the only thing is that it sucks it happened to you. But that is why they offer a warranty.

We had a Subaru lunch a turbo 2.5l at 10k miles, they repaired it and we traded that car with over 100k and zero issues many years later. There is always one that has a problem...

Sent from my SAMSUNG-SM-G900A using Tapatalk

[MIDNITEZ71]

On 10/27/2017 at 7:07 AM, brendon444 said:

Yes still under warranty. Just concerned about future reliability. The most worn lifter was a solid one without the spring i'm assuming this was a non AFM one. Not familiar with internals of new engine.   Also I'm sure metal went through the bottom end. 

 

 

 

 

 

i am a old hot rod guy.when cams/lifters went out on those old chevy big blocks/small blocks.most guys would do a complete tare down of the motor.reason being is that the metal shaving from the wore out parts.they get into the motor and destroy the bottom end over time.

[brendon444]

3 minutes ago, MIDNITEZ71 said:

i am a old hot rod guy.when cams/lifters went out on those old chevy big blocks/small blocks.most guys would do a complete tare down of the motor.reason being is that the metal shaving from the wore out parts.they get into the motor and destroy the bottom end over time.

My thought exactly. Oh well run it after repairs and don't plan to keep it off warranty. 

[MIDNITEZ71]

4 minutes ago, brendon444 said:

My thought exactly. Oh well run it after repairs and don't plan to keep it off warranty. 

the "F"ed up thing about it is that GM knows better.any good mechanic know what happens to these motors when parts fail like this.were do you think all this metal goes into the oil filter?

   no what really happens is that it clogs the oil ports and journals thru out the motor.which will lead to oil pressure lose.not to mention that these new motors have tighter spec tolerances then the old motors.that is why they use 0w-20 compared to the old 10w-30 motor oils.if it were me i would make them replace the whole motor or do a complete tare down.but we know that aint going to happen.......good luck man

[2017SierraSLT]

Sounds like three issues. One is a soft cam, which is not as prevalent on the roller lifter engines as it was with the flat tappet. Two, a defective lifter, which was due to poor assembly, or lack of oiling, and third, poor lubrication, which could have contributed to the whole mess.

[L86 All Terrain]

Oil aeration in these new DI engines is typically due to higher crankcase pressures. If this wasn't an issue on the LS family, I don't see how GM could go backwards with the new LT family, considering the LS was the first kick at the Cat and they nailed it. I am still trying to ponder how a bit of oil aeration would lead to a damaged AFM lifter locking pin, like above, perhaps there is an entirely separate oil system issue that doesn't provide enough oil to the lifters. Sorry for your loss, if they aren't even going to give you new heads or tear down the bottom end to look, let alone give you a complete new crate engine then I would trade that in faster than greased lightning. 

[brendon444]

2 hours ago, 10SierraA.T. said:

Oil aeration in these new DI engines is typically due to higher crankcase pressures. If this wasn't an issue on the LS family, I don't see how GM could go backwards with the new LT family, considering the LS was the first kick at the Cat and they nailed it. I am still trying to ponder how a bit of oil aeration would lead to a damaged AFM lifter locking pin, like above, perhaps there is an entirely separate oil system issue that doesn't provide enough oil to the lifters. Sorry for your loss, if they aren't even going to give you new heads or tear down the bottom end to look, let alone give you a complete new crate engine then I would trade that in faster than greased lightning. 

Opened a case with gm to see if they could offer me anything. Extended warranty or good trade on a new one. Will keep everyone updated. They called today to say they are working on my case and no other details. Have had a lot of new gm vehicles currently a 14 and 16. 

[brendon444]

Got the truck back today. Replaced all 16 lifters + cam and even the oil pump + other associated parts. Install looks clean, impressed with the dealership. Valve train sounds a lot quieter than before. Oil pressure looks good. 

Haven't put many km on yet. 

 

Still waiting to hear back from gm if they will offer me anything. Been polite through the whole process as I no things happen. But future reliability still a concern and if you don't ask you don't get. 

[brendon444]

Gm called me today and asked if I wanted to trade it and would give me numbers. Not sure if this will work out to a good deal and better than what a dealer would offer? Anyone have experience with this? 

[Donstar]

15 hours ago, brendon444 said:

Gm called me today and asked if I wanted to trade it and would give me numbers. Not sure if this will work out to a good deal and better than what a dealer would offer? Anyone have experience with this? 

I have experience with a major engine repair on a newer vehicle but not on a GM trade deal.  I was extremely apprehensive about having major work done to my truck and my fears proved unfounded.  I owned that truck for an additional 100 k trouble free kms before trading it on my current truck.  If you want a new truck then  this GM offer may be a great opportunity.  You will end up with a newer truck at a good price but it will still cost you!  My vote is for you to keep your current truck.

[brendon444]

12 hours ago, Donstar said:

I have experience with a major engine repair on a newer vehicle but not on a GM trade deal.  I was extremely apprehensive about having major work done to my truck and my fears proved unfounded.  I owned that truck for an additional 100 k trouble free kms before trading it on my current truck.  If you want a new truck then  this GM offer may be a great opportunity.  You will end up with a newer truck at a good price but it will still cost you!  My vote is for you to keep your current truck.

Yeah I may end up keeping it. But if I can get into a new one at a better than market price i might take it. I will see when they get back to me. 

[midwestdave33]

On 10/27/2017 at 7:10 AM, 2017SierraSLT said:

Thus the reason for warranties. A small percentage fail.

i've had two fail within 6 months of each other, 2nd one failed last night. 45k on the odometer. i'm installing a AFM delete kit asap.