removing stationary sheave from crankshaft

[Barrie2777]

We have all been there once....how to remove the stationary sheave from the crankshaft. It has been on for 50 years and wants to stay there thank you very much. There are probably as many suggested methods as there are machines out there with sheaves to come off. A fellow was in here yesterday for some parts and suggested a method I have never heard of but I am sure it will work and this method seems to pose no potential damage to any other part. That is the brilliance of his method. He suggest taking the outer sheave off and in the case of a stationary sheave with no inner thread, tap out the hole. The end of the crank is at the bottom of the center hole. Now, fill the hole with oil (or water), put some Teflon tape on the appropriate sized bolt and thread it in. Using an impact driver, continue to thread in the bolt until the accumulated hydraulic pressure blows the sheave off the crank. My guess is that you may want to shield yourself from the sudden eruption of oil, but this should work without banging, bending or breaking anything. Lets here some thoughts on whether this is a good idea or not.

[BillNH]

If it's like the clutch on my Diablo, you wouldn't even have to take off the other parts, as the inner sheave shaft extends out thru the outer sheave, Another, less messy, method would be to put a piece of round stock in there and let the bolt push against it, just put a little penetrating oil in first, to give sleeve a little help coming loose. This would be almost e.xactly the same as the clutch on my 09 Cat

[jayvee43]

This method is used very rarely. We use it on TRA Clutches because they are threaded half way down, then loose to go into the crank end of the motor about 2 inches deeper.

So Halfway down the "fixed sheeve shaft" there are a few turns of threads. But not all clutches have these built in threads. So Be carefull you don't thread into the ENGINE CRANK instead.

See: https://www.youtube.com/watch?v=cc0wAMjNgow

[BillNH]

Right, if you measure from the end to the crank end depth, you will know how deep you can thread it. If you buy a bolt long enough, you could have the end turned to remove the threads in order to have a single piece tool. It would look a lot like the one we used to remove the clutch from my sons Arctic Cat. A long stepped bolt, you remove the bolt holding the clutch, screw this in and tighten with an impact wrench. The clutch comes off with only a few smacks from a dead blow hammer.

[Recoil]

IF your interested in a home made puller to get this off see this link...

viewtopic.php?f=5&t=1447

Recoil