Mysterious Oil Pan Findings

paulwaul1369 · Sep 22, 2024

For my Z71 Tahoe LT V8 5.3 I was replacing the oil pump. And you know that means you have to drop the pan to do this amongst other things like the xfer case, a cross member and the axle shaft. In the oil pan, I found this broken piece of something... some pins, andwhat looks like a lock ring. (All metal) Check out the pics and lemme know if you know what these might be. There is a backstory though. I just did a top end and replaced all the lifters, guides and all gaskets for the exhaust manifold, intake manifold, and valve covers. I'm hoping these were there from a previous job before I bought the damm thing. I did a pretty clean and thorough job. Enough of the blabbing. Here are the pics.

mikez71 · Sep 22, 2024

rocker arm needle bearings. I have heard about these falling out..
Since that chunk of what I think is a rocker is in there, I'll bet it's from a previous job.
Have heard of the bearings showing up and everything still running fine...

strutaeng · Sep 22, 2024

Yikes. Agree with @mikez71

Why did you replace the oil pump? Did you have oil pressure issues? Was that resolved?

Time to remove the valve cover, but you just replaced the top end and would have seen the rocker issue. So it's possible that was from a previous job, yes.

j91z28d1 · Sep 22, 2024

yep.. I've heard of it, but never seen it in real life.

wow. definitely inspect all the rockers.

solli5pack · Sep 23, 2024

That looks like the remains of a failed non afm lifter. Here's a pic of a bad one I pulled out of my Yukon.

paulwaul1369 · Sep 23, 2024

That's it. I gotta double check those lifters just to make sure the new ones are still good. Thanks everyone. I'm still putting the xfer case back on right now. Once I get it all back together I'll check those lifters before starting her up.

donjetman · Sep 24, 2024

You do know? the only way to visually do that is to pull the heads off and pull the lifters out.

mikez71 · Sep 24, 2024

Though if the roller broke apart on his new lifter, the rocker would likely have play?

solli5pack · Sep 25, 2024

mikez71 said:
Though if the roller broke apart on his new lifter, the rocker would likely have play?

I'm thinking if the roller detonated while the engine was running there is going to be quite of bit of internal damage to the cam, bearings and maybe crankshaft? Looks like he only found half the roller so the other half is somewhere up in the engine. The rocker for that lifter should definitely be acting funny.

mikez71 · Sep 25, 2024

Makes sense.. Too many bearings fell out and the roller was loose and banging.. Paulwaul would have noticed that!

Hopefully the previous owner replaced the cam too..

Maybe Paulwaul got a look at the cam lobes when he replaced lifters?

Mysterious Oil Pan Findings

paulwaul1369

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