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Magneto body

Submitted by george_phillips on Wednesday, 10 February, 2016 - 00:00
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Just when I thought it was all up and running I've discovered a hair line crack in the sprocket cover of my MO1L magdyno. It is at the narrowest part of the housing on the top right when viewed from the timing side and goes right through judging by the gunge oozing from it. It runs across the bike (eft to right). Is this something that can be safely lived with? Is it repairable (not sure of the material). Or should I be looking for a magdyno body?One day it will all be up and running!

Submitted by george_phillips on Wednesday, 10 February, 2016 - 00:03

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It's the body, Dan. Right next to the top sprocket across the narrowest part (when viewed with the cover off). It just weeps a bit. What's JB welded?

Submitted by dan_field on Wednesday, 10 February, 2016 - 00:04

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JB weld is a metal based epoxy glue, http://www.jb-weld.co.uk/

I've made temporary repairs that have lasted for years, obviously not concours tho! If you do repair the crack it would be worth drilling a small hole at each end of the crack to stop it spreading.

Any chance of a photo?!

Submitted by george_phillips on Wednesday, 10 February, 2016 - 00:05

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I'll try Dan.The crack can be seen at the top right (about 2 O'clock) next to the upper sprocket location and running back across the casing.Attachments
p1000281-jpg

Submitted by dan_field on Thursday, 11 February, 2016 - 00:00

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George

i see what you mean, if you haven't had the mag rebuilt yet I'd get it rebuilt into another case. Not sure where you are but I used APL magnetos in Shaftesbury. You could try having the aluminium welded but I suspect you will always see the repair. I'd also check that the dynamo is tight in its seat and that the gears are ok.

ian

......oops!

Dan

Submitted by george_phillips on Thursday, 11 February, 2016 - 00:07

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Thanks Dan. I'll check APL out and also check the tightness of the unit. I'm halfway down Cornwall.

Submitted by ian_macdougall on Thursday, 11 February, 2016 - 00:08

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George,

It would be worth checking if your dynamo gear is running true. If the gear has been bored slightly off-centre, or if the armature shaft is not perfectly straight the resulting eccentric movement of the gear might stress the case at that point. If you connect the dynamo as a motor (off the bike) you should be able to see if there is a wobble on the gear.

Ian McD

 



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