Author Topic: dynamo sprocket removal.  (Read 2034 times)

Offline GuyboA10

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dynamo sprocket removal.
« on: 01.03. 2008 10:59 »
Hey guy's,Re: 53' A10. i am trying to remove the dynamo driving sprocket from the idler pinion spindle which are both still on the inner timing cover. I cant work out how it comes apart, without doing damage. is the sprocket on a thread or does it slide off after taking off the nut and washer? Can anyone help me out ?
cheers Guy.

Online bsa-bill

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Re: dynamo sprocket removal.
« Reply #1 on: 01.03. 2008 15:18 »
It's just a good fit on a taper, best to leave the chain on, remove nut and washer and turn engine while at the same time applying (gentle) sideways force to sprocket, ( like a very small pry bar behind sprocket).
You could heat the sprocket prior to this with a heat gun if you have one, it's not usually a great problem to remove.

If you have unlimited funds take the sprocket off the dynamo as well, throw both of them in a bin and buy a toothed belt system.

all the best - Bill 
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline a101960

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Re: dynamo sprocket removal.
« Reply #2 on: 01.03. 2008 15:19 »
The dynamo chain drive sprocket is a taper fit. Once the retaining nut and tab washer have been removed the drive sprocket should be able to be removed by tapping the sprocket with a hammer and a soft drift (copper for example). The dynamo sprocket is small enough to pass through the crankcase opening. I have a belt drive kit fitted to my bike, and the drive is drilled and tapped to permit removal by a puller. As I said though with the original chain set up removal is best achieved with a hammer and a soft drift. It should not prove to be to difficult. I hope it goes well. good luck.

Offline a10gf

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Re: dynamo sprocket removal.
« Reply #3 on: 01.03. 2008 23:15 »
I remember heating the pinion with a small blowtorch, tapping gently on it all around with a small hammer, all while having it under some pressure using an extractor (that I had to grind down to get the 'claws' behind the sprocket teeth. Suddenly it went "click" and got loose, took some time and patience.

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Offline farmboyuk

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Re: dynamo sprocket removal.
« Reply #4 on: 11.03. 2008 11:28 »
I was just about to ask the same question, since I needed to align the timing marks. The heat gun worked at treat with a couple of taps with a rubber hammer!