Posted by Janicholson on April 03, 2013 at 19:36:36 from (74.60.94.18):
In Reply to: F-20 Block question posted by pdinius001 on April 03, 2013 at 18:12:35:
Sleeves need to nave no ridge that you can feel with a fingernail to be considered reasonable to use. The use a a small square of 320 grit paper, and a bore gauge of the correct range is needed. If it seems to have little ridge, (measured or felt where the top piston ring stops on the up stroke) then measure the actual taper. Sand the unworn area above the ring wear, and measure it for diameter (4 ways across and carefully) then measure the same directions lower where the rings stop. If the difference is less than .005" it will be OK. If less than .002" they are pretty good. If more than .005" they are worn and will use oil. Ridge ream the top of the sleeve if you decide to own it, or you will break the pistons or crack something taking them out. Tiny pits from rust that are pepper grain size make little difference. bigger pits that will take a sharpened pencil point are not acceptable. Obviously cracks or broken spigots (bottom end of sleeve) are a show stopper. Sleeves are modest in cost, So use care in deciding to use marginal used parts. Jim
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