I am working on rebuilding "Jumping JaKK". Its the K341 that had the front of the snapper 1650 jumping around. Sometime it had sheared the flywheel key, unknown to me, and I kept trying to figure out why it was jumping all over the place. Well I guess I am the one to boogger up the crankshaft taper. It has many deep scores in it where the key ate it up. The fly wheel too. Everything I read said that I was screwed and needed a new crank and fly wheel. Yall know me, if its broke I cant make it much more broke by trying something.
So here is what I am trying. I have filled all the score marks with braze. I will file down the heavy stuff, then I will use lapping compound to finish it up. I will use JB weld in the fly wheel to fix the score marks in it and use the lapping to fit it to the crank.
My preliminary test indicated that it was a go on the crank. I hit a few of the divots with braze, let it cool, and lapped it in with the fly wheel. I had nice even marks on everything. The braze wore away nicely and I had fit on all surfaces, no file marks were left from taking the heavy stuff off.
After that, I fired up the torch and hit the few other places that needed it. Its out in the shop waiting for me to have some time to go through the process again.
My biggest concern will be warpage. I heated evenly and cooled slowly. I have no way to really test it until I put it in the block. Then I can use a Dial indicator to see what TIR looks like.
I aint puttin alot of faith in this, I think its gonna be warpped bad. So I hope somebody here has a crank and fly wheel that they will part with when this doesnt work out.
I will get pics of the process when I have time to go out and work on it. Hopefully sometime this week.