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Author Topic: Very stubborn front sprocket  (Read 567 times)

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Offline Dirty Steve

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Very stubborn front sprocket
« on: April 29, 2019, 09:26:09 PM »
Hello all,
I’m trying to take off the original front sprocket and it is nature welded on there and refuses to budge.
I took off the big nut/oil lubrication thingie and the two bolts and the tricky washer. I have been led to believe at this point it should just slide off, but it aint a sliding...
I tried placing a flat bar behind the sprocket and threaded a couple of longer bolts through the bolt holes to try to push it out-one broke and the other is mushrooming at the point where it’s coming into contact with the flat bar. I am being careful not to damage the oil seal behind the sprocket and I’m trying not to push it to the point where I crack the aluminum.
Anyway, I guess my next move it to apply some heat and see if that helps.
I’m open to any other ideas.
Thanks,
Steve
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Offline Don R

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Re: Very stubborn front sprocket
« Reply #1 on: April 29, 2019, 09:33:45 PM »
Maybe borrow a gear puller if you can find one that fits in there. Put a bolt in the shaft, maybe with a center divot for the puller to center on.  Have you tried tapping the edges to rock it?
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Offline Tracksnblades1

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Re: Very stubborn front sprocket
« Reply #2 on: April 30, 2019, 03:24:37 PM »
Quote from: Dirty Steve on April 29, 2019, 09:26:09 PM
Hello all,
I’m trying to take off the original front sprocket and it is nature welded on there and refuses to budge.
I took off the big nut/oil lubrication thingie and the two bolts and the tricky washer. I have been led to believe at this point it should just slide off, but it aint a sliding...
I tried placing a flat bar behind the sprocket and threaded a couple of longer bolts through the bolt holes to try to push it out-one broke and the other is mushrooming at the point where it’s coming into contact with the flat bar. I am being careful not to damage the oil seal behind the sprocket and I’m trying not to push it to the point where I crack the aluminum.
Anyway, I guess my next move it to apply some heat and see if that helps.
I’m open to any other ideas.
Thanks,
Steve

When applying heat, I like to shield those seals with an extremely wet rag.
Directing very intense heat quickly, to the sprocket in this case, while shielding (sheet metal) direct flame from rag side of shaft and sprocket, aluminum case, and etc. Not heating for very long, and quickly cooling with water during unsuccessful attempts.

Persistence and determination are usually quicker than hope and luck.
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Offline jgger

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Re: Very stubborn front sprocket
« Reply #3 on: April 30, 2019, 06:07:44 PM »
Might try a hammer and a brass drift. Position the punch as deep as you can in a tooth and tap it with the hammer so it can move clockwise (opposite from the driven rotation ) with the trans in gear. The splines on the sprocket may have worn and rotated slightly before it "nature welded"..........worth a try.
« Last Edit: April 30, 2019, 06:09:48 PM by jgger »
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Offline spotty

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Re: Very stubborn front sprocket
« Reply #4 on: April 30, 2019, 07:37:46 PM »
put the chain back on, take it for a ride, that should shift it........
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Offline robvangulik

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Re: Very stubborn front sprocket
« Reply #5 on: May 01, 2019, 04:24:33 AM »
Let it sit for a few hours after spraying it with a good penetrating oil.
NOT WD40......
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