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LM1 alternator brushes.

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TheWrongTrousers View Drop Down
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    Posted: 28 Dec 2018 at 11:51
Morning all

I have taken the alternator cover off the bike and am having a look inside. The reason for having a look is that the alternator light stays on rather longer than I would like it to when riding the bike. 

I can see that the alternator brushes are about 10mm in length, but it is hard to judge how worn down this is, not knowing how long they were when new.  It all looks pretty filthy in there. 

Should I replace them ?

And another thing. If I do replace them, will a regular household soldering iron be sufficient for fixing the wires into place or do I need something more beefy ? 

Perhaps there is an alternative way of fixing the wires in place. if so could someone tell me ?
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Ken-Guzzibear View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken-Guzzibear Quote  Post ReplyReply Direct Link To This Post Posted: 28 Dec 2018 at 12:04
If replace these get it done by a specialist, no way will a domestic iron work, Guzzi charge a fortune for these, they are a Bosch part  look for a local Bosch Auto service place, the brushes are the same as BMW use in their older airheads and BMW are alot less than Guzzi ones It costs way less to have them fitted than to buy the specialist solder and soldering iron and and of course the skills to actually do the job 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TheWrongTrousers Quote  Post ReplyReply Direct Link To This Post Posted: 28 Dec 2018 at 13:31
Thanks for that KGB. At about 10mm - do you reckon they need replacing or are there many more miles of happy motoring to be had on my stumps ?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpc Quote  Post ReplyReply Direct Link To This Post Posted: 28 Dec 2018 at 15:37
The brush length when new is 17mm, and the minimum usable quoted as 7mm in my source.

Also note that the "normal" spring pressure is achieved with 1/2 turn preload for all models, but for the LeMans the preload is 1 full turn.

I have some spare pairs of BMW-origin brushes, part number is 21 31 1 244 480.

The alternator light issue could be something else, regulator, connexions ?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ianboydsnr Quote  Post ReplyReply Direct Link To This Post Posted: 28 Dec 2018 at 16:37
I  never solder them, though I have never replaced them on my guzzis I have done it a few times to BMW’s, you can buy them that have an eyelet on them, from motoworks.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TheWrongTrousers Quote  Post ReplyReply Direct Link To This Post Posted: 28 Dec 2018 at 20:33
Thanks guys for these super helpful comments. I too have seen brushes with eyes on them. They sound a good idea to me. 

Do you have a link to the motoworks website you could put up ?


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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 28 Dec 2018 at 21:20
https://www.motorworks.co.uk

Edited by Brian UK - 29 Dec 2018 at 09:50
Brian.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote ranton_rambler Quote  Post ReplyReply Direct Link To This Post Posted: 29 Dec 2018 at 08:39
Maybe not the same, but I resoldered the brushes in a friend's Fiat alternator with an old screwdriver heated on a gas ring.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpc Quote  Post ReplyReply Direct Link To This Post Posted: 29 Dec 2018 at 08:52
And I used to heat my apartment with flower pots stood upside-down over the cooking range, but we seem to grow more sophisticated with the years passing... Smile
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TheWrongTrousers Quote  Post ReplyReply Direct Link To This Post Posted: 29 Dec 2018 at 09:17
Originally posted by ranton_rambler ranton_rambler wrote:

Maybe not the same, but I resoldered the brushes in a friend's Fiat alternator with an old screwdriver heated on a gas ring.

I like that very much. Improvisation and versatility. The sure signs of a problem solving mindset.  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TheWrongTrousers Quote  Post ReplyReply Direct Link To This Post Posted: 29 Dec 2018 at 09:18
Originally posted by Brian UK Brian UK wrote:

https://www.motorworks.co.uk/vlive/Home/index.php

Brian, the link would not work. Do you have a part number you could give me ? 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 29 Dec 2018 at 09:51
Brian.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ianboydsnr Quote  Post ReplyReply Direct Link To This Post Posted: 29 Dec 2018 at 10:49
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TheWrongTrousers Quote  Post ReplyReply Direct Link To This Post Posted: 29 Dec 2018 at 17:07
Ian, that worked. So the ones I found were the 'Alternator brush set' number ELA44480 at a price of £5.30 inc VAT. And these will fit a LM1 right ?

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ianboydsnr Quote  Post ReplyReply Direct Link To This Post Posted: 31 Dec 2018 at 16:14
Originally posted by TheWrongTrousers TheWrongTrousers wrote:

Ian, that worked. So the ones I found were the 'Alternator brush set' number ELA44480 at a price of £5.30 inc VAT. And these will fit a LM1 right ?


Yes, they should fit a lm1
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