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Magneto seal? #686820
03/05/17 12:17 am
03/05/17 12:17 am
Joined: Feb 2017
Posts: 4
Missouri, USA
P
Professor Fate Offline OP
BritBike Forum member
Professor Fate  Offline OP
BritBike Forum member
P
Joined: Feb 2017
Posts: 4
Missouri, USA
Putting a new magneto on my 48 model 18 and was wondering if there is suppose to be a seal of some type between the mag housing and the timing chain case. It' been a while since I removed the old mag and I can't recall if it had one. Seems like the oil/grease would migrate out without something there...

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Re: Magneto seal? [Re: Professor Fate] #686980
03/06/17 7:55 am
03/06/17 7:55 am
Joined: Aug 2014
Posts: 1,473
OZ
Triless Online content
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Triless  Online Content
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Joined: Aug 2014
Posts: 1,473
OZ
Well, probably not exactly applicable here, but there was a similar situation with my Model X Bigtwin. I simply cut a circular piece out of some felt of the requisite thickness I happened to have, and that worked well.

Re: Magneto seal? [Re: Professor Fate] #691554
04/13/17 2:29 pm
04/13/17 2:29 pm
Joined: Sep 2007
Posts: 1,109
Ottawa, Canada
gREgg-K Offline

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gREgg-K  Offline

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Joined: Sep 2007
Posts: 1,109
Ottawa, Canada
With your machine being a 1948 model, you will likely have a Lucas N1 magneto. The N1 has an internal rubber "seal" (of sorts) to keep things from entering the mag. This seal along with centrifugal force helps keep the bearing grease inside, so that is rarely a concern unless someone has massively over packed the bearings.

The mag is chain driven, so there is no provision to lube its chain positively with engine oil. As a result, you don't have to worry about leakage from the case, and you simply apply chain lube to keep it healthy.

As Triless suggests above, a piece of thick felt between the mag body and timing chain case will help keep moisture and other nasties from entering the timing case.

.. Gregg

Last edited by gREgg-K; 04/13/17 2:34 pm.

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Lucas, BTH, & Miller Magneto & Dynamo Restoration
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