So I am still trying to get a working motor in my FB. I picked up a 12a from an ex-racer who told me that his nephew rebuilt the motor from the best parts of 6 motors that they disassembled. He said that the chrome on the housings is good, the irons are good, the rotors and e-shaft are good. I went to install my freshly resurfaced flywheel, and realized that the threads are a bit boogered on the e-shaft where you thread on the flywheel nut. I was wondering if anyone knew off the top of their head what the thread was, so I could source a die and clean up the threads before attempting to install the flywheel.

Thanks

-Jim

 

I use a small triangle file to clean boogered e-shaft threads if I ever encounter any.

I just checked. Pitch is 1.5mm. Same as exhaust studs. It looks a lot finer than that, but only because it's so big! Anyway that is why the threads are easy to clean up with a small triangle file. So save yourself the trouble.

 

you can also use a thread file. they are usually produced with several thread sizes cast into the body. mine has eight different sizes and its produced by snap on.

 

rule #1 is always put the nut back on! threads can't get screwed up that way

 

Any idea what diameter it is? I know that the nut is ~42mm across the flats, so it's what, 30 or so mm in diameter? 30x1.5?

 

42 isn't the answer to everything. Have you ever actually measured the nut?

I can't measure the shaft dia for you now. I already threw a flywheel on it and dropped it in yesterday. lol

 

The outside of the threads measure 35.8mm, so I'm assuming that it's a 35x1.5.

I'm going to go to Granger tomorrow and pick up a 1.5 turn/mm thread file and give that a shot. If they don't have it, I'll order it from McMaster Carr.

 

1.5 is a common size. VWs use it for bellhousing bolts. I'm sure you'll fine one. Maybe I should get one.

 

McMaster Carr has the files listed with a set of small, metric dies for ~34.00 + Shipping. I'm going to bomb over to Granger tomorrow before they close and see if I can get one of theirs (with just the 1.5turn/mm cut profile) for ~16.00