HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
acarter92

Removing Crankcase bearings?

9 posts in this topic

Well, I have to get the bearings out of my new (well, ok it's used) crankcase that I have so I can put in new ones so it's ready when I put it on my bike. This means that all the bearings i nthe case have to come out. I couldn't care less if I damage the bearing themselves (they're just getting thrown away, but I can't damage the case at all. Anyone have any suggestions on getting these pressed bearing out without screwing up my case. And while I'm on the subject how do I get the new ones back in without wrecking my case or my bearings.

Thanks in advance,

Austin

Share this post


Link to post
Share on other sites

a puller ,or grind them down with a dremel till there is a hair left then crack them with a cold chisel they will fall out .

new ones , put them in the freezer . at work we hit them with liquid nitrogen . then tap them in with a socket that is the same size as the bearing . or a bearing installer .

note: never taken bearings out of a wr450 , these are just some ways to get out bearings . some times i just cut them off with a torch , still never cut the base material . just have to know what the metal will do .

Share this post


Link to post
Share on other sites

It might work. you heat the case (not the bearing). aluminum gets hot faster than steel and expands more, so with care, it may work. Expediency is key

Reinstall, I put the bearings in a ziplock in the freezer the day before. I heat the case in the over to 250, and the large bearings will fall in. Be sure to orient them right as you get once chance. As soon as the cold bearing touches the hot case, they warm/cool each other in a second. The smaller the bearings, you may need to have a bearing tool or socket and a hammer handy to tap it in. You have to be quick.

Share this post


Link to post
Share on other sites

For installation of the new bearings, if you can't find a socket the correct size I find grinding the outer face of the old bearings so they slip in without jamming is a good tool for tapping the new bearings in. I do this with wheel bearings and it works a treat.

Share this post


Link to post
Share on other sites
Thanks, I just got done reading the article linked below. They heat the whole case and it said the bearings just fall out. Would it work for my bike (99' wr400). http://www.oldbritts.com/b_removal.html

Thanks,

Austin

you might still have to tap them out with a punch and hammer .

with vehicle and machine axles i hang them from a crane heat the bearing while spinning the shaft and ya they fall off and hit you in the foot if your not carefull

Share this post


Link to post
Share on other sites

It worked! Much to my surprise they fell right out. Instead of a keroseen heater I used my two burner camping stove. I just positioned it so the burner was right under the bearing and about 10 minutes later I would hear it fall. I would then move it over the next bearing. Both halves took about an hour. Maybe not as quick as punching them out or using a press but it sure it better for the case and takes less effort. I think an oven would be where it's at but unless you have one in your shop your going to really piss the women folk off with that nice smell of burning oil.

Austin

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0