rubber sealing 022703

Information relating to the Matchless G3 or AJS Model 16 350cc Heavyweight
The Vandal
Member
Posts: 79
Joined: Fri Sep 16, 2022 7:43 pm
Location: West Sussex UK

Re: rubber sealing 022703

Post by The Vandal »

Maybe I could fit two, and then a third over the top and once the mag is bolted in place sort of push the third one down between the two to apply some pressure? That make sense?
56G80S
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Posts: 3369
Joined: Wed Oct 12, 2005 10:45 pm
Location: N YORKS UK

Re: rubber sealing 022703

Post by 56G80S »

Apply pressure and the case could deform or something else comes under undue pressure and creates a problem in the long run. My mistake, back in the day, was not to play sufficient attention to the straightness of the chain run between the camwheel sprocket and the mag sprocket.

Personally, I think Pharisee's solution is best, foam, just to prevent water ingress. Maybe with some high melting point grease on the inside wouldn't do any harm?

Johnny B
The Vandal
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Posts: 79
Joined: Fri Sep 16, 2022 7:43 pm
Location: West Sussex UK

Re: rubber sealing 022703

Post by The Vandal »

For anyone thinking about going to oring route in the future, I have fitted two on the 'stub' and then a third over these, sort of sitting in the trough between them. Once my magneto is in place and staying there I'll push the third oring down a bit which should squidge the second one out and against the chaincase just right.
g80csp11
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Posts: 1580
Joined: Mon Jan 01, 1990 12:00 am
Location: WEST SUSSEX UK

Re: rubber sealing 022703

Post by g80csp11 »

I was looking at a SR1 mag the other day and the seal compressed to 0.5" between case and Mag body
Steven S
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Posts: 52
Joined: Mon Jan 01, 1990 12:00 am
Location: BEDFORDSHIRE UK

Re: rubber sealing 022703

Post by Steven S »

That sounds a bigger gap than normal. The correct thickness for the SR1 rubber should be 0.47", which ours (AMC Classic Spares) are, though someone mentioned in a previous post that it wouldn't compress enough. That may be due to modern rubber being less squishy than the old stuff but in my position it's very hard to compensate for that when commissioning a part for manufacture.
g80csp11
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Posts: 1580
Joined: Mon Jan 01, 1990 12:00 am
Location: WEST SUSSEX UK

Re: rubber sealing 022703

Post by g80csp11 »

Ill tell Ray his bike is wrong , or perhaps not it was measured in the garage with a 2 foot steel rule !
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