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Damaged transmission gear bearing

  • Thread starter Thread starter caltrop
  • Start date Start date
C

caltrop

Guest
So this is the second time I've tried to get a transmission for my 450 off of eBay. First time, covered in rust spots (got my money back of course). This time, seems ok, except the first gear on the output shaft (which just slides off) was dinged while either being stored or shipped off of the shaft. The bearing material is dented and pushed up at the end of the oil distribution channel. Do folks think this is reparable, or should I try yet again?
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It's repairable.

Even though unlikely, your best bet would be to try and find someone with a bearing scraper to remove the damaged spot. Not having access to one of those, you could carefully file off the damage with a round file and polish the area with wet/dry sandpaper or a piece of crocus cloth; checking it for proper fit as you go along.
 
I'm in the process of rebuilding a transmission now. My philosophy is if a part is questionable, I would rather replace it now while the cases are split than have to go back in once the motor is assembled. If a new gear is available, I'd replace it. I had a damaged 3rd gear but after careful inspection, I ended up replacing 2nd and 5th also.Since one of the shift forks was also broken, I am installing all new forks,drum, and most of the shifter hardware. It may be possible to press that bushing out and replace it.You would have to see if one is available.
 
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You can repair this, but it is important to touch as little of the bearing surface as possible. Use a needle file (google it if you do not know what one is) to remove any material protuding into the oil channel, or that might snag on the shaft. Again, be careful not to alter any more of the bearing surface than you need to. The idea here to simply to remove any protuding material, and leave the rest of the bearing to do its job.

Sanding will not be needed.
 
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