Sump bolt thread restoration

[David Stepney]

I guess that's from the top of the coil?

Yes, as you will need the tang at the bottom to wind the helicoil in.

[falcott]

Gotcha.

[Ruairidh Dunford]

   

[falcott]

Thanks again Ruairidh.
If I do happen to use the 1.5D length, would it cause thread bind, do you think?
I haven't received the V-Coil kit yet, so I can't check.

[Alan]

You can put 1.5D in some of the holes but not all. It’s not worth the hassle. 0.5D Vcoils are cheap enough.

[Ruairidh Dunford]

You can put 1.5D in some of the holes but not all. It’s not worth the hassle. 0.5D Vcoils are cheap enough.

What Alan said...

[falcott]

Okay, no problems. Someone in the past was very heavy handed when drilling and tapping my crankcase to 5/16". It's broken through the back of the casting. So the threads are long, and I have no idea how long the original 1/4" was, hence my questions. Thanks.

[AustinWood]

Quite a few sump bolt holes go through into the sump. Some are blind.

[Chris KC]

Indeed. For those I would suggest a dab of thread sealant. A 1/2D helicoil is more than strong enough to hold the sump on, regardless of the screw length, but won't self-seal.