Author Topic: Considering dynamo belt conversion  (Read 1596 times)

Online Greybeard

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Re: Considering dynamo belt conversion
« Reply #30 on: 30.05. 2018 19:26 »
My DRL belt drive arrived today, when fitting the small pulley, washer and supplied nut, the nut sticks out past the pulley  7/16", is this correct ?
I'm sure Mike, the proprietor will be able to answer you soon. How about a picture?

Offline RogerSB

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Re: Considering dynamo belt conversion
« Reply #31 on: 30.05. 2018 19:29 »
My DRL belt drive arrived today, when fitting the small pulley, washer and supplied nut, the nut sticks out past the pulley  7/16", is this correct ?

Roy, see reply no. 13 by Mike Hutchings, which shows a good picture of it and it looks like it does.
https://www.a7a10.net/forum/index.php?topic=3748.0

Also in the .pdf instructions after the 'Description of Features' on his 'Dynamo Belt Drive Kit' webpage it show the same picture but smaller.

1960 Golden Flash

Offline RoyC

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Re: Considering dynamo belt conversion
« Reply #32 on: 30.05. 2018 19:37 »
My DRL belt drive arrived today, when fitting the small pulley, washer and supplied nut, the nut sticks out past the pulley  7/16", is this correct ?
How about a picture?

I notice, on that picture that the boss has been half removed. Does this have to be done also ?


My bike is a 1958 A7SS
Stafford UK

Offline RogerSB

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Re: Considering dynamo belt conversion
« Reply #33 on: 30.05. 2018 20:00 »
Remembered I had a photo of my SRM version taken from above so easier to see without the pespective foreshortening it - and the nut on the SRM version sticks out quite a way as you can see. Must be a reason for it but  *dunno*. Maybe Mike Hutchings can tell us.

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Offline RogerSB

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Re: Considering dynamo belt conversion
« Reply #34 on: 30.05. 2018 20:06 »
I notice, on that picture that the boss has been half removed. Does this have to be done also ?

No Roy, it was done by a slack chain whipping up and down before the belt was fitted

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Offline RoyC

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Re: Considering dynamo belt conversion
« Reply #35 on: 30.05. 2018 21:13 »
Remembered I had a photo of my SRM version taken from above so easier to see without the pespective foreshortening it - and the nut on the SRM version sticks out quite a way as you can see. Must be a reason for it but  *dunno*. Maybe Mike Hutchings can tell us.
That does answer my question Roger. Thanks.
My bike is a 1958 A7SS
Stafford UK

Offline morris

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Re: Considering dynamo belt conversion
« Reply #36 on: 30.05. 2018 22:14 »
If I remember well, the nut sticks out indeed. The hole in the small pulley is quite deep and to small for a socket so with the nut tight you wouldn't have any hexagon left to get a spanner or socket on.
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Offline Dynamo Regulators Mike

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Re: Considering dynamo belt conversion
« Reply #37 on: 31.05. 2018 08:39 »
The 7/16" from end of dynamo nut to pulley face is quite normal. Still a long way from touching on the outer timing cover, and does not cause any real problem. The spring washer we supply is a thick one at about 1/10", and could be thinner. The base of nut to hex could be reduced by a tenth or so. There is a certain tolerance on the nut of course, and that distance has not been well controlled by the machinist. We might change the drawing to tighten things up. But little to gain from doing so, as this is pretty much a cosmetic issue I feel.
Mike Hutchings
A10, B50, T800; 1,2,3 (& DVR2)
Director, DRL www.dynamoregulators.com

Online Greybeard

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Re: Considering dynamo belt conversion
« Reply #38 on: 31.05. 2018 20:22 »
The kit plus a spare belt arrived today. Lovely grub!  *smile*

Online bsa-bill

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Re: Considering dynamo belt conversion
« Reply #39 on: 31.05. 2018 20:42 »
Back in the day as they say, I used to get through dynamo chains on piece, young and not to mechanically skilled of course so maybe my fault but I'm sold on belts, toothed
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 RoyC

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Re: Considering dynamo belt conversion
« Reply #40 on: 01.06. 2018 07:31 »
I have read that some people are still packing with grease to keep the belt cool,
Is this really necessary ?
My bike is a 1958 A7SS
Stafford UK

Offline muskrat

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Re: Considering dynamo belt conversion
« Reply #41 on: 01.06. 2018 07:56 »
Not since I run it loose.
Cheers
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Offline RoyC

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Re: Considering dynamo belt conversion
« Reply #42 on: 02.06. 2018 15:08 »
What holds the drive sprocket on (the one with rivets in) ?
I have removed the nut and washer and tried to pull it off with a puller, but it won't budge.  *help*
My bike is a 1958 A7SS
Stafford UK

Offline morris

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Re: Considering dynamo belt conversion
« Reply #43 on: 02.06. 2018 15:15 »
What holds the drive sprocket on (the one with rivets in) ?
I have removed the nut and washer and tried to pull it off with a puller, but it won't budge.  *help*
It's on a taper but can be a real bugger to get off  *ex*
I remember when I removed mine I completely destroyed it.
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Online berger

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Re: Considering dynamo belt conversion
« Reply #44 on: 02.06. 2018 15:25 »
treat it like you would a car ball joint taper, give it some pink Floyd a short sharp shock with a brass or copper drift