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May 20th, 2007, 04:13 AM   #1
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roller bearing removal

Just started putting my 2002 650 block back together and messed up already

I switched to roller bearings for the mains, heated up the inner bearing races ( hope this is the word, i mean the inner things on the bearings wich you can remove from the bearing and go on the crank), fitted them, and then put the block together, just to realise that I forgot the damned balancer!!

Problem now is how do I get the inner race back of of the crank, it's to close to the crank weight so I can't get a puller under it. If I try to heat it I warm up the crank also so it expands also, I tried covering the crank itself with some wet rags and try only to heat up the bearing race (using a heat gun for this), but still no succes. Anybody know a good trick to get the bearing race of?

If nothing works I'm gonna grind the bearing race of and order a new one, but would like to avoid this.

Thanks Christof.
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May 20th, 2007, 05:11 AM   #2
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Re: roller bearing removal

Hi Christof,

What you need to do is get a small billet of steal bore the centre out to the same size diameter as the bearing you are taking off then cut it in half heat these two pieces up to 150 degrees C then put the two pieces around the bearing and the sudden intence heat build up should expand the bearing enough so it will slide off but you will need the mass of metal to tranfer the heat quickly, this how you would do it if you bought the proper bearing removal tool. Good luck.


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May 20th, 2007, 05:21 AM   #3
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Save yourself a lot of headache and beg/buy/borrow or make an inner race tool.

Or take it to a KTM or Husaberg workshop who will have one of these tools, and give them the task.

If you insist on doing it without the right tool, and have no plans to use the inner race again I have heard that a quick blast of heat from an oxy/acetylene torch will allow the race to heat rapidly without heat soaking into the crank, and the inner race will drop right off.

Must be Oxy/Acetylene with a large tip to allow quick/intense heating of thethe inner race to heat expand real quick, ie a few seconds.

Apparently small propane torches do not generate heat quick enough to get the job done, as the heat soaks into the crank as you have found.

I understand the above procedure was supposedly standard instruction in earlier KTM 2 stroke workshop manuals for the same design roller bearings,or so I was told, but never verified.
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May 20th, 2007, 11:01 AM   #4
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Thanks for the tip, but got it off without damaging it. Heated the crank up in the oven and then was able to pry it off with a screwdriver until i was able to put a puller under it and pull it off.

Thanks for the tips anyway! Christof.
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