Worked on quite a few of these, back in the day, and found a lot of them had rings stuck and gunked up. No real wear, and assumed it was caused by start/stop operation, and never getting up to temp.
If compression checks low, I had good luck pulling nozzles, and soaking top end with BG44k, or GM Top Engine cleaner, to loosen up carbon, then blow out, reassemble, and get it started.
Cardboard over radiator and let it get hot...not meltdown hot, but up to about max safe temp, and let it run that way.
That would usually free things up enough to bring compression up.
Also, tap muffler with rubber mallet while running at hi idle....these will accumulate an unbelievable amount of soot and carbon!
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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