midshaft has bearing race stuck to it

[meatball]

I had to replace my midshaft housing because my grease seal popped out, and rusted/let the bearings fall out. Because of the severity of the rust, the inner bearing race is stuck/pretty much damn near welded to the midshaft. I tried pounding it very hard, with no luck. I dont have a press to get this fixed.

My thinking was that I could cut it off with a dremel, and try not to nick the midshaft it self. Is this method ok for such a repair? Would scratches on the midshaft result in the ruining of the part and why?

Is there any other way I could get it off?

Does anyone here have the tools (ie a press) to get it off? I would pay some money for them to fix it (as long as its like half the cost of another midshaft). And would the midshaft be ok after removing this race? (as in not scratched or other)

-Kevin

 

[FyrHazard]

I would avoid knicking the shaft itself. You don't have to cut all the way through the race. Just make a line with your dremel deep enough to get a chisel started in, and pound at an angle to the shaft (not straight down into it). Sometimes it helps to have another line 180 degrees from the first. Bearing races are very hard (meaning brittle) and will usually just break apart with this method. Just my $.02

 

[SuperJETT]

I'd cut it at 180 degrees apart, not all the way through, then snap it off. Even if you do nick up the shaft, it's not going to hurt things really since the inner race doesn't spin on it like a roller bearing does.

 

[leprechaunjohn]

heat?

 

[meatball]

then afterwards, how does the midshaft go into the new midshaft housing? Do I need a press for that? Or can I just slide it in by hand?

-Kevin

 

[Freakrider]

then afterwards, how does the midshaft go into the new midshaft housing? Do I need a press for that? Or can I just slide it in by hand?

-Kevin

the proper way is to use a press...give your local yamaha guy some lunch money to press it in....bet he says yes

 

[SuperJETT]

I always just whack it in with a hammer with a block of wood to prevent damage to it. Then again, I'm in Kentucky so you're required by law to do things like that.

 

[sflsurfrider]

i once had the midshaft bearing seize and the midshaft was spinning in the inner race. as you could probably imagine, this didnt last long. im not sure how much time there was from the time the bearing seized, to the time when (i thought) the engine completely locked up for no apparent reason.....

....after removing the engine, only to find that it was fine, i tried to turn the midshaft and it was seized. very seized.

this was the most stubborn thing ive ever had to press. the press couldnt handle it. i was practicly hanging on the lever. i had to put a piece of angle iron between the press and midshaft to simultaneously strike on either side, with two hammers while the pres was under pressure. when it finally did come out, it made a HUGE BANG!

i did have to clean up the surface of the shaft where the bearing sits, but it was still straight and usable.

have fun.... and wear an adult diaper. its the law where darin lives.