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Discussion Starter #1
Hi all:

I'm back to the re-building stage of my 650. Riddler set me up with a 2nd hand crank in good condition. Managed to get the old crank out with a bit of pounding and persuasion. Didn't mind pounding on the old one as I figure that bearing has served its time - and the crank was toast.

The second hand crank has the bearing in place, not really interested in replacing that bearing, seems to be in great shape. Given that the bearing is on the crank, is there an easy way to get the bearing/crankshaft back into the casing without too much heavy pounding? I'm going to heat the casing with a propane torch and I've got the crank in the freezer for overnight. Hoping that temperature difference is enough to make it fairly easy. Does anybody have any experience with this? Is this approach do-able? Any other suggestions?

The AC service manual suggests that if the bearing is pressed into the case, the inner race can be heated with propane and the crank should slide right in - but I'm not reassembling it that way.

Many thanks!!

PS. And extra thanks to Riddler for supplying the replacement crank - hope your own engine problems get resolved without too much grief.
 

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It came out with a propane torch and a press the way you see it.
And I had the press on the crank so I would imagine the way you are doing it is the same way I would go back together with it.
I have done several bearings that way and it works very well.
Do you have one of those infared heat guns?
With propane you would probbibly be ok but if using mapp gas I would defintely have a temp gun.
 

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Discussion Starter #3
Thanks John, I have propane or oxy-acetylene. Was thinking that the propane would be the safest option, probably no danger of overheating the case anyway. I'm going to try and get my hands on some co2 today, thought that might help to keep the crank cold. I don't have easy access to a press. Could take the parts to work and do the crank reinstall but that isn't the most convenient option.
 

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The bearing is still on the crank he wants to install the crank/bearing as one into the case. So he don't risk damage to the bearing pulling it.

When I pressed the crank from the case it came out with the bearing on the crank.
 

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Discussion Starter #7
So now I've got some dry ice which should help to shrink the bearing/crank, and with some heat on the case to expand the bore, hopefully it will go together fairly smooth. Will be giving it a shot in a few hours....hope this part of the rebuild doesn't eat up too much time. Should be pretty straight forward after this.
 

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I am with you on not damaging it. That was kinda the point if the case is hot and the bearing cold it should not need enough force to hurt anything.
The bearing is still on the crank he wants to install the crank/bearing as one into the case. So he don't risk damage to the bearing pulling it.

When I pressed the crank from the case it came out with the bearing on the crank.


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Discussion Starter #12
lol....hold onto that xtz motor for now. The crank dropped in like a %^$# in a schoolteacher!! That was a relief...thanks for the encouragement all!! :)

As an aside, even my wife didn't mind putting the crank in the freezer!! :D Easy to see who enjoys the side by side in this household.
 
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