Dialing in a repower bellhousing

[grahamf]

Steve
The best way is to align the bellhousing first with the offset dowel pins, mark where the pins are, thoroughly clean the pins and holes with a solvent, then add loctite when the pins are replaced. Denis and I achieved +/- 0.001" concentricity this way, and repeatable too. I wouldn't weld precision machined parts if you wanted accuracy - it moves too much. I've tried this, before you ask!!!!

Besides, you can't weld steel washers to an ally bellhousing, cast steel (i think) doesn't weld either, but you can braze it which needs more heat, but I may yet be corrected on this point! Whichever, heat = movement = no accuracy.

Dowel pins with interference and slip fits in accurately machined holes are the way to go, which is why I'm having so much trouble!

HTH
Graham

[tallyho]

Originally Posted by grahamf

Steve
The best way is to align the bellhousing first with the offset dowel pins, mark where the pins are, thoroughly clean the pins and holes with a solvent, then add loctite when the pins are replaced. Denis and I achieved +/- 0.001" concentricity this way, and repeatable too. I wouldn't weld precision machined parts if you wanted accuracy - it moves too much. I've tried this, before you ask!!!!

Besides, you can't weld steel washers to an ally bellhousing, cast steel (i think) doesn't weld either, but you can braze it which needs more heat, but I may yet be corrected on this point! Whichever, heat = movement = no accuracy.

Dowel pins with interference and slip fits in accurately machined holes are the way to go, which is why I'm having so much trouble!

HTH
Graham

Cheers Graham, useful info and very clear regarding approach.

Steve