Lasted 268,000 Miles Then Catastrophic Failure! GM 6.2L L92 Engine Teardown With MASSIVE Damage!

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Today we have one for those who crave carnage. This is the 6.2L L92 V8 out of a 2009 GMC Yukon Denali I bought from a tow lot. This was an abandoned vehicle that I had ZERO history on, so once we pulled it in to check it out, we quickly realized why someone walked away from it. The engine is VERY VERY bad. At 268K, what killed this Denali engine? Let's take it apart and find out.

Why am I doing this? My name is Eric and I own and run Importapart, a full service auto dismantling business. Part of our model includes buying blown up and bad engines to dismantle for parts. We salvage the good, sellable parts and recycle rest. No, we don't rebuild engines but we do sell parts to people who do!

As always I hope you enjoyed this video. I love all of the comments, feedback and even the criticism. Catch you on the next one!

-Eric


00:00 Intro
04:00 Popping the plug wires off, removing plugs and inspecting
04:45 Malice in the combustion palace!
05:43 Removing the intake manifold and inspecting the intake ports
07:54 Peeling off the RH Valve cover. Did they EVER change the oil? Yikes
08:53 Cramming the rocker arms loose, removing valve train and pushing the pull rods out.
10:33 Crackin' the RH Headbolts loose and lifting the head
11:29 Inspecting the pistons, bores and cylinder head. This thing ATE something it wasn't supposed to!
13:14 FAILED THE SCIENCE TEST
13:35 unbolting the LH valve cover and it somehow looks worse!?
14:03 Cramming the left rocker arms loose and removing valve train. All looks better than I anticipated.
15:29 Crackin' the LH head bolts loose and lifting the head
16:00 We seem to be missing something important
18:02 SCIENCE 2.0, Its WORSE
18:11 Water pump removal and disposal
19:06 The Great Harmonic Balancer Fight Of 2025
24:57 Removing the timing cover, OH, Now it makes sense. Someone has been here.
25:48 Pulling the lifters and trays for inspection. Are these original? NO AFM HERE.
26:26 Unbolting the cam gear, removing and inspecting the camshaft
27:55 Block hole reveal
28:25 Unbolting the blast basket formally known as the oil pan
29:29 So. Much. Shrapnel
30:36 THE SMOKING GUN
31:45 Dropping the FULL windage tray. It broke a WHAT?
33:16 removing and dismantling the oil pump for inspection. Why did they replace this? what were they chasing?
35:26 Buy some cool shirts
36:10 Removing the first two connecting rods and pistons
37:01 Removing the second two disconnecting rods
39:50 Unbolting the third four rods and pistons
40:42 Removing the main cap bolts
41:28 Pulling the main caps and lifting the crank after not so dangerously adjusting the engine stand
43:58 Complete rotating assembly inspection. Crankshaft, bearings, pistons, rings, rods, block. ITS ALL JUNK!
48:54 Dismantling a cylinder head to reveal the extent of damage.
51:29 A Partial!
52:45 Summary