Posted by Jim Becker on October 20, 2011 at 08:25:51 from (173.57.144.251):
In Reply to: 4H project update posted by pete 23 on October 19, 2011 at 10:59:29:
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Same suiggestion as made earlier on the cylinders, have the kids measure and decide what is needed. Check valve stem clearance, if excessive measure the stem diameter to determine if it is the stem, the guide or both. Replace as needed. Even if the valves/seats look good, reface them. If the step wasn't really needed, the material removed to dress them up will be almost nothing. (It can be a surprise how out of round or off center a good looking valve can be. Stem wear is often on one side.)
The cylinder bore almost looks like the cross hatching is still showing! If so, you might want to consider just doing a valve job and leaving the pistons in place. You don't want to pull the pistons then reinstall the old rings. It is possible somebody reringed (or sleeved) it and didn't do the valves, leaving it as a oil burner just because of valve stem wear. If you leave the pistons/rings alone, I would still check the main and rod bearings. You won't know if they were recently replaced until you check.
(I know, a lot of this is just repeating what you or others have already said.)
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