VL Crankpin Torque Specs

[tucker 34]

I can't find in the books what the crank pin torque specs are for a 1934 Big Twin. Also what is the torque for the flywheel shafts.

[Steve Slocombe]

I haven't seen any specification other than 'very tight'. On the crank pin, the idea seems to have been to keep pulling on the nuts until the end float of the rods between the wheels was reduced to say 0.010-0.015". I think that is a bit on the tight side, and the repro crankpins can be a shade longer than original, so if I can get to 0.025" end float without going past 150 pounds feet torque I'm happy. Likewise on the shaft nuts there is no torque specification, but 100-150 pounds feet torque snugs down the nuts and turns them so you get the lockwashers on.

[duffeycycles]

I agree most repro crankpins are slightly longer so you will not get original spec on clearance

[harleytoprock]

I have also seen where the outsides of the forked rod has been ground, making for more side play. 150 foot pounds sounds a bit scary.