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DuratecMan10

GFY! I'll never be straight !!!
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2016 Escalade. Collapsed the #4 exhaust lifter, pretzeled the pushrod and broke it off.
Not sure where the rest of the pushrod is right now.
I shoved it out back next the the 15 Silverado that collapsed #1 and #7 exhaust lifters.
Lifters are on national backorder.
I've already had 4 cylinder heads off for the same issue since 2020 started.

Damn, fun times. Is there a recall on these motors or just a major design flaw? It's almost like the crappy DCT transmissions.


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leadfarmer

Hot Rod !!!
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GM is having us replace what it known as the valve lifter oil manifold any time we get an active fuel management lifter failure.
It sits in the valley and has solenoids which dierct oil to the lifters to "unlatch" them during cylinder shutdown.
It's thought that slight internal oil leaks are causing the latches to fail.

I personally think its asking 1 thing to do too much. Ive seen the lifters blown apart into 3 pieces, I've seen them stuck in their "on" positions, and I've seen them collapsed.
Sometimes it pretzels a pushrod, sometimes not.

These engines have them on 4 cylinders, #1, #4, #6 & #7.
The new gen engines in the 2020's have them on all cylinders and can effectively shut down up to 6 cylinders if everything is met...yes, it will run down the road as a V-2.
Yeh . Put a chip in your obd2 an turn that *s-word off.

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USMC615

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