? on some stripped threads

[toddyfresh]

i bought a crankshaft off here and guy said the flywheel side had some threads cut off but nut screwed on just fine.. i go to put my motor back together today and the nut doesnt go on to the shaft.. upon closer inspection the threads are a little boogered up and this nut probably is screwed now too.. well i just ordered a new nut but i was wondering what you guys think i should try.. should i try chasing the threads? if so do u guys know the nut size? just pissed off and wanna get this thing going..

[bansheesandrider]

i bought a crankshaft off here and guy said the flywheel side had some threads cut off but nut screwed on just fine.. i go to put my motor back together today and the nut doesnt go on to the shaft.. upon closer inspection the threads are a little boogered up and this nut probably is screwed now too.. well i just ordered a new nut but i was wondering what you guys think i should try.. should i try chasing the threads? if so do u guys know the nut size? just pissed off and wanna get this thing going..

If you had a factory service manual, it would tell you the threads are 12X1.25 and the torque spec is 58 foot pounds. I would try to find a RETHREADING die to chase the threads. A rethreadind die will try to reshape the existing metal back into good threads and not just cut new threads.

[Larry's Shee]

Might try thread file , not sure if they're available in metric . Did you get it from someone in the Detroit area ? Seen one on CL , same description. Just wondering.

[toddyfresh]

Yeah believe it was. He's a member on here but I emailed him about it and didn't wanna roast him till I talked to him. I see harbor freight got a complete die and tap set for 19 bucks. I'll proabbly go that route or see what he has to say.

[bansheesandrider]

Yes thread files come in metric. If you want a rethreading die you will have to go to a Snap On truck or Mac, Matco,etc. I would not use a tap and die set from Harbor Freight, you might end up with a bigger mess than you have now.

[12 0 Clock P I M P]

Yes thread files come in metric. If you want a rethreading die you will have to go to a Snap On truck or Mac, Matco,etc. I would not use a tap and die set from Harbor Freight, you might end up with a bigger mess than you have now.

 

 

I am sure the Harbor freight set will be fine for you....Snap - ON stuff is wayy overpriced...but it is a great product.....You will rarely use the set if you don't have one now already .....just match up the die and center it properly ......and you will be back in business.

[sleeper06]

Im a snap-on guy but not the piont make sure the kit your buying has that size

[bansheesandrider]

I am talking about a RETHREADING die not a CUTTING die.

[blowit]

IMO, if the threads are only "buggered", the "only" way to fix them is the thread file. Once you give them a shot, you will love them. I would not try to force a chase on there but I have seen some slick to piece chases that clamp down and work well but are too pricey for the home shop.

 

 

Also watch the end of the crank. Many people will smack the end or they get damaged in shipping and it mushrooms the end and increases the diameter at the end. It can all be fixed though. Just don't make it worse.

 

 

Brandon