Smell, Of Death

[stepthrutuner]

Here's a pretty good page on 2t piston failure diagnosis and prevention thereof. Don't know if we've seen it before?

www.smellofdeath.com/lloydy/piston_diag_guide.htm

[90GTVert]

Never seen it. Cool find. Thank you!

[2strokd]

Very interesting!

[tomcas]

There's one they didn't show. On my cheap Chinese scooter the roll pin fell out that orientated the gap on the second piston ring and the ring rotated so that it aligned with the port openings. It didn't break the ring but hammered the piston groove so far out of shape it froze the ring in the groove so it lost all compression. I wish I could find the picture cause it wasn't a pretty sight.

[Fox]

Wrist bearing failure has got to be the worst thing to happen. It ruins the entire top end.

The protrusion in this pic is one of the rollers from the bearing completely fused in the piston.

[90GTVert]

I've holed 'em, scuffed 'em, had debris from a rod bearing get in there and bash around, screwed up the ring lands... Here are a few samples. Keep watching my builds threads and you're bound to see more.

[stepthrutuner]

Oct 12, 2010 19:41:28 GMT -5 tomcas said:

There's one they didn't show. On my cheap Chinese scooter the roll pin fell out that orientated the gap on the second piston ring and the ring rotated so that it aligned with the port openings. It didn't break the ring but hammered the piston groove so far out of shape it froze the ring in the groove so it lost all compression. I wish I could find the picture cause it wasn't a pretty sight.

A. G. Bell recommends knocking the inside corners of the piston ring(s) end gap(s) down slightly with a precision file so that the sharp corners don't catch and pull the locator pin out when the engine is hot.