Posted by RN on July 17, 2013 at 09:47:27 from (205.213.104.118):
In Reply to: WD9 crusted pistons posted by Wheaty on July 17, 2013 at 09:15:17:
acetone 50/50 mix with the ATF works better than ATF alone. A propane torch apllied to pistons to heat and let cooled with a shot of WD40, PB blaster or a squirt of ATF/Acetone at side of cylinder walls /top edge of cooling piston a couple heat and cooling cycles. Put engine on stand and turn upside down, do the heat and lube as cooled drill from bottom. Then the wood block and light to heavier taps with a large (Harley sized) hammer. Old machinist had some friends doing antique restoring- they didn"t have any replacement pistons available for 1920s/1930s engines so were taking a litle extra time to save as much as possible- a slightly to severely but mostly there damaged piston could be used in a mold form to make a sand mold to cast a new piston while broken pieces were difficult to measure and use. He was mentor for the 1937 Harley UL restore/rebuild I did- funny thing was the local Harley dealer had the valve guides in stock. Use some sandpaper, emory on tops, side of cylinder to remove as much crud as possible- a thump upward might move 1/8 inch up when can"t move down- but that is enough to get some more lube into the new opening crack and then 1/8 inch down thump, 1/4 inch up thump, 1/2 inch down thump-- and so on until piston is freed. Watch for top of cylinder ridge- might want to ridge ream and get piston out the top since cylinder taper tends to be a bit larger toward top. Have fun, save the head. RN
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