aham2003
Member
It appears the threads on a used motor I picked up are trashed. Has anyone every drilled and tapped the shaft on a 212?
Anybody ever tapped a shaft thread?
- Thread starter aham2003
- Start date
Flyinhillbilly
The great cornholio
Yes, In fact I’ve shortened cranks and redrilled them for use with an outboard clutch.
It’s not too bad really, just work slow with plenty of oil.
It’s not too bad really, just work slow with plenty of oil.
Last edited:
aham2003
Member
Did you go a size up when you did it? It looks like an M8x1.25 is slightly larger than the 5/16 (M7.9). Being that there would be less material to bore due to being so close in size, would going with an M8x1.25 tap be a good idea? It doesnt look like I have much room to work with.
Jwarren357
New member
I had to do this to one of mine, re drilled crank in a lathe, then taped it with a 5/16-24 bolt
Flyinhillbilly
The great cornholio
I didn’t, up the size at all, but I can’t really see where it would hurt anything.
Bansil
Painter of gnomes....
is the hole deep enough you can chase it with the current thread pitch and just use a longer bolt? you only really need 1-1/2 X the diameter of thread engagement so ~1/2 inch of good threads is fine