Posted by KEB1 on September 14, 2008 at 09:32:53 from (63.228.80.19):
In Reply to: Serial number question posted by Marjorie Van Fossen on September 13, 2008 at 18:22:34:
F-20's use bearing inserts like a modern engine, not babbitt bearings. I believe its possible to change them through the hand holes on the side of the engine, but if you do have a rod knock you might be better off to tear the engine all the way down & make sure there aren't any other problems.
What's the oil pressure look like? A rod will knock when the bearing wears enough to be loose, at which point you'll also have low oil pressure.
If you do decide to just change the rod bearings, check the crankshaft journals carefully for wear, and mic them to make sure someone hasn't had the crank turned & put in undersize bearings at some time in the past. These old slow turning engines are pretty forgiving, and if you're not using it to actually work you can get away with a lot of shortcuts.
I find it interesting that at a time when most automobiles still had flathead engines, babbitt bearings, and splash lubrication, agricultural engines had overhead valves, insert bearings and pressure lubrication.
Babbitt is a metal alloy similar to solder. Babbitt bearings are poured in place and then scraped by hand or bored to provide the proper clearance. Its an interesting process, but a real pain if you're not set up for doing it.
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