Found this in the oil pan of a stock bottom end 4g63, 2005 evo 8.

Set the razor blade next to it for size reference.

Wrist pins are press fit, so any idea what it is?

 

Holy crap.

Looks like a wrist pin clip

I dont know anything else that uses a snap ring in a 4g63

 

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Its very small tho. Like the size of a dime.

Im starting to think foreign object dropped in the head and made it thru an oil galley

 

ive never seen a stock wrist pin from a evo but they arent too big ine the motors ive seen.

 

How did you find it? Drop the pan or drain oil?

 

But 4g63 are press fit, no clips.

Drop the pan. Found it in the bottom.

 

Looks like just the drain plug crush washer

 

Oh ok good so its not from the wrist pin.

Maybe its been there for a while

 

Don't think so, the outer diameter would be wider.

 

Maybe. I dropped the pan to inspect bearings because the motor has a noise on throttle that seems similar to developing rod knock. The bearings looked great, but I found this when cleaning the pan to reassemble it.

 

Maybe the noise is related. Maybe the block has pistons and does take a wrist pin clip or is it 100 percent stock that you know of?

 

Its a completely stock head, stock turbo, stock intake manifold.

Rods are definitely stock too. I'd be shocked if someone did pistons only.

 

What kind of noise are you hearing?

 

Hard to describe. Metal on metal repetitive clicking like my rod knock sounded in my own car, but the bearings checked out. Checked timing tensioner for dead spots, replaced it anyways. Maybe balance shaft bearings. Sounds under the intake manifold.

 

This piece is steel, not rubber?