Main bearing removel help

[Bluesmoke250]

I need your help, suggestions or tricks for removeing the main bearings on a 2001 yz 250 they are the original bearings. I have tried heat as well as pounding on them. The dealers tech told me to heat them and they sould pound right out. This did not work for me I am thinking a bearing puller is going to be the only way any help is appriciated.

 

[IndyMX]

you shouldn't heat the bearing, but the cases..

last time I pulled bearings from a case, I just heated my oven in the kitchen to 250 and put the case in for 15 minutes..

Then took it out and used a hammer and large socket. Dropped right out.

Remember to use leather gloves or hot pad, the case will be quite warm when you take it out of the oven.

 

[whenfoxforks-ruled]

Put some wood under the case and knock it out like Indy said. You did take the seals out first? Check it that it stays square. The outer race drives better than the inner race, really big socket. Getting them off the crank is another matter.

 

[IndyMX]

There's an inexpensive tool that can be had to remove them from the crank..

Might even be able to borrow one from Autozone..

 

[Bluesmoke250]

Yes the seals are out i will try auto zone. Thanks for the info

 

[Ol'89r]

I have tried heat as well as pounding on them. The dealers tech told me to heat them and they sould pound right out. This did not work for me .

You didn't get the cases hot enough. Do like Indy said and heat them in an oven or take a large torch and heat them in a circular motion until you can sizzle a drop of water on them. If you use a torch, start at a point furthest away from the bearing and using a circular motion, heat the cases, working the torch inward towards the bearing so the bearing is the last thing to receive the heat. DON'T hold the torch in any one spot for any length of time. Aluminum melts at a very low temp.

If you get them hot enough the bearing should drop out or only take a light tap with a deep socket and hammer.

Install them the same way. Use a socket or driver that fits the outside diameter of the bearing. Never beat on the inside race of a new bearing.

Driving them out cold will wear out your cases.

 

[julien_d]

200 degree oven for 15 minutes and mine popped right out.

 

[IndyMX]

You didn't get the cases hot enough. Do like Indy said and heat them in an oven or take a large torch and heat them in a circular motion until you can sizzle a drop of water on them. If you use a torch, start at a point furthest away from the bearing and using a circular motion, heat the cases, working the torch inward towards the bearing so the bearing is the last thing to receive the heat. DON'T hold the torch in any one spot for any length of time. Aluminum melts at a very low temp.

If you get them hot enough the bearing should drop out or only take a light tap with a deep socket and hammer.

Install them the same way. Use a socket or driver that fits the outside diameter of the bearing. Never beat on the inside race of a new bearing.

Driving them out cold will wear out your cases.

I found that when heating the cases in the oven, they stayed hotter longer, and made the job less of a rush. When I get in any kind of a rush, I tend to screw things up.

Using a torch, I couldn't seem to get the damn things hot enough for long enough to really do a good job.

 

[Bluesmoke250]

The only problem i can see with putting them in the oven is that you have to remove everything on the case such as on the fly wheel side all the support bearings for the gearcase or are these ok to put in the oven?

 

[Bluesmoke250]

They are out.

 

[whenfoxforks-ruled]

When you are this far in, replacing the remaining seals is a given. It will not harm the other bearings.