it depends on the era of the engine. starting around 1980 to 1982 tecumseh changed the flywheel taper on the small frame motors and also changed the flywheel nut size from 5/16-24 (5/8" socket) to 3/8-24 (3/4" socket.)
it depends on the era of the engine. starting around 1980 to 1982 tecumseh changed the flywheel taper on the small frame motors and also changed the flywheel nut size from 5/16-24 (5/8" socket) to 3/8-24 (3/4" socket.)
For our purposes, I think 5/16-24 is correct. I do have some BIG old Kohler and Briggs engines that are tapped 3/8NF.
But they are tall cast iron thumpers.
when tecumseh started drilling/taping the PTO for a bolt in the 1980s, they usually used 3/8-24, not 5/16-24. but when i drill the PTO i always use 5/16-24, because it's easier...
The two tecumseh engines I have that are factory drilled and tapped are 3/8-24. 1 is an ‘84 hs50 and the other is an h40 replacement engine that is a mid 90’s.
Keep in mind if your drilling one that doesn't have a threaded hole already going with the smaller 5/16 thread would give you a second chance later on if anything bad happened in the future and you needed to re-thread it. You could go 3/8 at that point.
Ha that is true. My briggs 3 h.p. from the 70s has a 1/4x20 i put in it. If i wasn't 12 or so then i would have knew to use a 1/4x28. Doesn't require much to keep a clutch from side stepping. I still remember buying the tap from a service star hardware store with grass cutting money i suspect.
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