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Re: Oil leak

Yes indeed Joe you have to strip the box to fit a modern double sealed bearing (I remove the inner seal). Also the sleeve gear bush #54 might be worn which could also allow oil to pass. Ron

Scan_150628_0002
delete ebay

email (option): ronpier@talk21.com

Re: Oil leak

Thank you so much for the reply .

It is too big a job for me so I’m going to try and just live with it (and not put the bike on the side stand, lol)

Cheers,

Joe.

Re: Oil leak

The gearbox without any form of working seal (in other words a standard box) can lose its oil very quickly, reaching a level that is low enough to result in premature wear of various components...

I would recommend you check the level and top up as required every 300-350 miles maximum...Ian

email (option): ian@wright52.plus.com

Re: Oil leak

Thanks for that.

Joe.

Re: Oil leak

Does anyone have a step by step write-up on how to change this seal (Haynes manual style?) for the main tranny, I know it entails taking the whole thing out.

Also can someone let me know the product number and where I can obtain one to replace the seal with a modern double one.

All help will be gratefully accepted. I will need to do this myself as I can’t find a mechanic that works on old BSAs near me here in Arizona.

Thanks,

Joe.

email (option): Se98jl@hotmail.com

Re: Oil leak

Hi Joe,
Have a look in the tech docs section, some good pointers there.
The bearing you want is 6207RS or 62072RS(and pop out one of the seals), not very expensive at all, £5.50 in the UK.
https://www.bearingboys.co.uk/Dunlop-Ball-Bearings/62072RS-Dunlop-Sealed-Ball-Bearing-1903-p
Scott

email (option): larkesATgmail.com

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