The BSA A7-A10 Forum

Technical => Lucas, Electrical, Ignition => Topic started by: Spitfiremk9 on 24.03. 2013 16:49

Title: dynamo belt tension
Post by: Spitfiremk9 on 24.03. 2013 16:49
Anyone help me remember how much play there should be in my dynamo belt ,i've just looked at it and there was way too much and so have adjusted to approx 1/4" up and down in the middle top run, is this enough or to tight, Regards BobH.
Title: Re: dynamo belt tension
Post by: chaterlea25 on 24.03. 2013 17:00
Hi Bob
What kind of belt drive is fitted?? vee or toothed?

John
Title: Re: dynamo belt tension
Post by: warmshed on 24.03. 2013 18:49
Depends on what one you have fitted. The one made by Dynamo regulators .com (who make the DVR")  say "Correct tension is such that it is easy
to turn the belt at the middle of the lower run by about 45 degrees each way."

Their full instructions are here http://www.dynamoregulators.com/documents/belt_drive_data.pdf
Title: Re: dynamo belt tension
Post by: Spitfiremk9 on 24.03. 2013 19:23
Hi John, vee , from sean miller , advertises in the BSA "star " but for life of me can't find paperwork Thanks everyone BobH
Title: Re: dynamo belt tension
Post by: chaterlea25 on 24.03. 2013 23:53
Hi Bob
Rekon a 1/4 in or so would do ???

John
Title: Re: dynamo belt tension
Post by: Topdad on 25.03. 2013 11:16
Thanks John, it actually from Hawker electricals ,Regards BobH.
Title: Re: dynamo belt tension
Post by: mayes on 25.03. 2013 18:53
John no more than 1/4 play
Title: Re: dynamo belt tension
Post by: Smithgd on 01.04. 2013 15:32
If I am reading this correct - The toothed belt is going to be set to run pretty tight. I think mine might have been too loose and the belt failed rather soon.
Any on had any experience with the stardard chain driving an Alton alternator??