Posted by fixerupper on November 13, 2015 at 18:29:52 from (100.42.82.100):
I have four Aluminum overbore pistons (3 7/8") out of an F20 I have started working on that I might or might not need to replace depending on how successful I am getting the rings off of them. One is eroded on top due to me screwing up not cleaning them thoroughly enough after a short dip in muriatic acid a few years ago but might be usable. I have no idea who made these pistons. They have three compression rings and one oil ring with the top compression ring being narrower than the next two compression rings. Inside the piston skirts is the letters MWM or WMW on one side and then the numbers A1002 on the other side. The rings are stuck very tight. I got the rings off of one piston in pieces but It took an hour and I still put a few small nicks in the piston in the process. The pistons were rusted and corroded in the bores very tight too but I don't see any damage on them from pounding them out after soaking them with every magic elixor known to man for a year. No water had sat on them as this tractor was shedded. I am not worried about finding rings, I'm sure Hastings can fix me up with new ones, but if I have to replace pistons I might have a harder time.
The sleeves and pistons have very little wear and the piston sidewalls are nice and smooth yet. The crank and crank bearings are fine.
Does any of the information about the pistons ring a bell with any of you guys? Of course the MWM makes me think of M&W but it might not be from that company. Thanks
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