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Old 12-20-2022, 07:18 PM   #7
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Location: Laval QC
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Originally Posted by seningen View Post
My guess is you have thrust wear. The motion of the pistons going up and down have a component of pushing against the wall. Partly due to geometry of the rods/wrist pins and probably gravity as well...
That makes sense. All of the scuff marks are on the top (as in top of the engine, not top of the cylinder) and bottom, which is what I would expect for thrust wear.

I had a closer look at the pistons. There is only normal wear on the skirts as far as I can see (not that I am an expert), the rings look like new and turn easily in their grooves, the rod bushings are tight when I try wiggling the rods laterally.
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Last edited by elgyqc; 12-23-2022 at 06:43 AM. Reason: correction
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