jb-chainsaws
Pinnacle OPE Member
just started tearing into an 046 that came in with “low compression”.
Piston looked scored from exhaust side so I was thinking maybe air leak, til I got the jug off:
The transfer might have cleaned up, but the bore is “peppered” with tiny pits. The culprit is below:
Big end bearing failure, if you zoom in on the photo you can see the retainer is starting to break up.
I figured I’d post this as it’s not something you see every day.
Thankfully I’ve a 460 in the boneyard with a good crank, otherwise it’d have been an even more costly repair. Fingers crossed the crank bearings survived
Piston looked scored from exhaust side so I was thinking maybe air leak, til I got the jug off:
The transfer might have cleaned up, but the bore is “peppered” with tiny pits. The culprit is below:
Big end bearing failure, if you zoom in on the photo you can see the retainer is starting to break up.
I figured I’d post this as it’s not something you see every day.
Thankfully I’ve a 460 in the boneyard with a good crank, otherwise it’d have been an even more costly repair. Fingers crossed the crank bearings survived