Trued & welded crank

[Shee-Male]

OK this might be a stretch but has anyone done their own truing and welding on their crankshaft?, I work at an engine machine shop and I'm sure we have the eqiupment.

Can anyone walk me through it or maybee tell me if there are things to watch for when pressing it apart or together, or bearings , or anyting I should be aware of?

Any help would be great.

Thanx

[dawarriorman]

I've thought about it, although when I do, i'll still probably send it off, cheap, and I'd like to have someone thats done it before do it.

 

That being said, I believe you would take out the crank, set it up somehow so you can spin it, and use a dial indicator to see which way it is out of true. The repair manual shows where to check at. Then use a hammer to bang it straight. Then simply TIG weld the crank together. Not exactly rocket science, but I can see how someone could screw one up.

[Shee-Male]

I know how the theroy goes, I'm supprised no one on this forum has done the procedure.

The Yamaha service manual dose not tell me a damn thing, I think once I get the crank out and to the shop it will probably be a peice of cake.

I'll post pics of the whole thing when I get into it.

[fast500#12]

pm passion re he did my engine work and is a hell of a guy. i'm sure he would answer any questions you may have.

[brock_fuzzy_69]

i got to watch a crank get assembled once

i would personally only do it if i replaced the rods or had to rebuild the crank

 

he used a big brass hammer

 

do not use a steel hammer

[ssanddemon]

It's really not that big a deal; just a good idea to watch a guy do it before you do your own. Louie Swann at Twister Cranks let me stand around while he did mine, years ago. First, it goes on the v-blocks to check out-of-round with a dial indicator. Just gotta be close. Then a few minutes with a TIG, spotting around the press-fits. Then back on the blocks with a dial indicator and a BIG lead hammer. He smacked it around until it spun true, and that was it. Total time, like 15 minutes.

[Cotton eyed Joe]

It's really not that big a deal; just a good idea to watch a guy do it before you do your own. Louie Swann at Twister Cranks let me stand around while he did mine, years ago. First, it goes on the v-blocks to check out-of-round with a dial indicator. Just gotta be close. Then a few minutes with a TIG, spotting around the press-fits. Then back on the blocks with a dial indicator and a BIG lead hammer. He smacked it around until it spun true, and that was it. Total time, like 15 minutes.

445818[/snapback]

I've always wondered, but why in the hell don't they make cranks with keyways in them so all you have to do is align the keyway, put the key in, and press the damn thing together? I make shafting for all sorts of shit from conveyors, power transmission ect, and ALL of them get keyways. That would make aligning a crank easy as hell, plus it probably wouldn't need to be welded if you used a 5/16" key.

 

Anyone know how much press those cranks have between the counterweight and the journal?