"This engine was rebuild last
"This engine was rebuild last season do to a bad crank, it rotted out and the splines stripped. A locating pin on piston #4 was found to be missing at that time, bearings were replaced as well. Engine had 125-130 compression after the rebuild.
In spring compression was good low 120's or so on all; ran it approx. 25 hours. Just recently decarbed it. On sunday, it developed a knock and was shut down immeadiatly. Compression on engine was found to be about low 120's on all except bottom, which was 80.
Bearings all seem tight, spin nice, and look good. Upper and lower crank bearings a bit noisy, but I think they just want lube, both spinning perfectly. Nothing strange I can find with any other part, just this piston, missing a big chunk and pieces of it everywhere.. cylinder even looks good - just needs cleaning, no scoring found yet.
Bad Cylinder:
"
"This engine was rebuild last season do to a bad crank, it rotted out and the splines stripped. A locating pin on piston #4 was found to be missing at that time, bearings were replaced as well. Engine had 125-130 compression after the rebuild.
In spring compression was good low 120's or so on all; ran it approx. 25 hours. Just recently decarbed it. On sunday, it developed a knock and was shut down immeadiatly. Compression on engine was found to be about low 120's on all except bottom, which was 80.
Bearings all seem tight, spin nice, and look good. Upper and lower crank bearings a bit noisy, but I think they just want lube, both spinning perfectly. Nothing strange I can find with any other part, just this piston, missing a big chunk and pieces of it everywhere.. cylinder even looks good - just needs cleaning, no scoring found yet.
Bad Cylinder: