Replacing crankcase bearings

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J

jg97986

Joined
Jul 1, 2015
Messages
5
Location
New Hampshire
I'm replacing my 2010 FX450 big end & main crankcase bearings. The manual says to heat the crankcase halves in an oven to 150 degrees C (302 degrees F) and the bearings will fall out. I don't really want to replace transmission or balance shaft bearings as well. Will heating them to this temperature cause any future issues? I see some of them have plastic looking parts to them. There's also a balance shaft seal that's plastic & stuck behind a bearing. Will that cope with 150 degrees?

Or do I have to replace EVERY bearing & seal if I do this? :cry:
 
About 60 seconds with a MAP gas torch, and a couple of gentle taps with a dead blow and drift (I use the dowel from the closet, but don't tell the wife).
 
Best practice is to heat the whole case evenly rather than just a small area.
Potential distortion etc.
I am not saying a heat gun wont work...... just not best practice.
 
I never seen the inside of these cases but can you use a press if supported right way ?
 
I don't want to heat sections, that could result in crankcase warping. Pressing out the main bearings isn't possible. And pressing out the other transmission bearings before heating the case isn't possible without damaging them as they're also pressed into holes with lips (so you can't get pressure to the outer shell). I guess that's why they say heat the case so they fall out.
 
Last edited:
The SKF website has loads of info. on operating temperature ranges for their bearings. Not all the bearings in the case are SKF but assuming they all have similar properties, it looks like they should all withstand up to 150 degrees C (302 degrees F). Which is what the manual says to heat the cases up to.

Just to safe, I think what I'll try is heating the cases up to something like 105C/220F first and see if I can get some purchase on the main bearings with a wooden dowel & tap them out. If not, raise the temp. a little each time up to 150C/302F.
 
Last edited:

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