Hi all,
Any ideas how I can removet a sprag clutch which appears to have seized onto the engine sprocket? I want to replace both, but can't use the puller which goes into the holes in the sprocket, and my only other hope is an external puller which currentlylooks as though it will need me to cut the chain to allow the legs to sit squarely behind the sprocket. Aaargh!
Also, would it be easier to buzz off a couple of chain link rivet heads or will I need to go through the links if it does come to chopping the chain (which would be a shame since it looks like it is virtually new)?
I've had three of these g…
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Previously norman_lorton w…
Previously norman_lorton wrote:
I've had three of these go over centre and jam in my time, but they were never seized. A bit of firm tapping on the sprags (which will have flipped and will now be jammed tight by the cage springs) should get them to release their grip and enable you to haul the sprag assembly out with suitable levers.
The sprocket will (should) be firmly seated on the crank but I find that a good torque on the extractor tool and then a few firm thumps on the centre bolt has it off; once I did have to apply moderate heat to the sprocket. Yes you would have to remove the chain first (I have never attempted that) if you wanted to put a puller on the engine sprocket.
Rather than buy a new sprocket and centre you could have them ground and redimensioned to stop them flipping over again. There is a copy of a Roadholder article from a couple of years ago in one of these discussion threads detailing how to go about it. Just search 'sprag' in the top left box and its the third link down.
Thank you for this: I got a local guy from the Triumph dealership to have a look. The sprag was firmly jammed and despite my gentle ministrations woulldn't shift. He suggested that since I was putting a new sprocket in, I should just chisel out the inner race of thesprag t release itand then use the extractor on the sprocket, thus avoiding cutting/destroyingthe chain. So I had a go and have succeeded in removing the sprag and the washer behind, thus exposing the sprocket face. Now waiting for the extractor for the next step. I will investigate the refacing suggestion, and see what can be be done locally. I have found the thread you mentioned. Thank you once again for your help. Watch this space!
Andy
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I've had three of these go over centre and jam in my time, but they were never seized. A bit of firm tapping on the sprags (which will have flipped and will now be jammed tight by the cage springs) should get them to release their grip and enable you to haul the sprag assembly out with suitable levers.
The sprocket will (should) be firmly seated on the crank but I find that a good torque on the extractor tool and then a few firm thumps on the centre bolt has it off; once I did have to apply moderate heat to the sprocket. Yes you would have to remove the chain first (I have never attempted that) if you wanted to put a puller on the engine sprocket.
Rather than buy a new sprocket and centre you could have them ground and redimensioned to stop them flipping over again. There is a copy of a Roadholder article from a couple of years ago in one of these discussion threads detailing how to go about it. Just search 'sprag' in the top left box and its the third link down.