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1978 115hp Fly wheel nut, what is the threading?

comet424

Regular Contributor
hi
so I cant find online what the threading of the crankshaft or nut is.


I bought a 3/4"-16 die to thread that crank shaft to fix a couple threads but it doesn't even go on it.

is there a special marine threading?? as the marine cant tell me what size of nut it is from the listing just that its 15 bucks

its for the 9b8b model
 
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