BSA 1953 Golden Flash

[anjimehra]

Hi
Am restoring a 1953 plunger BSA Golden Flash in Pune, India & would greatly appreciate help on the following:

Does the main roller bearing , drive side, have a seal on one end ( end facing primary drive case ) ?

Thanks in anticipation
Anji

[Goldy]

Yes. it is a single lip oil seal part number 67-674

[L.A.B.]

Yes. it is a single lip oil seal part number 67-674

I too would have expected to find a primary oil seal, however, the '49-'53 parts book doesn't appear to list or illustrate any (67-674) seal?

[Blue]

Although I haven't had much to do with the semi-unit BSA twins, I'm pretty sure there is not an oil seal between the crankshaft and primary chaincase.  To my recollection the splined sleeve that fits on the crankshaft has a flange on the crankcase end which butts up to the main bearing and encourages some sort of 'splash' lubrication to the engine sprocket.  This flange should have a swirl machined into the perimeter I think.

I hope this helps (and I hope it is accurate)

Blue

[L.A.B.]

Anji,

I suggest that you contact C&D Autos, who, I am sure, will be able to give you the correct information?

C&D Autos: http://pages.eidosnet.co.uk/~canddautos/

[anjimehra]

Goldie.L.A.B & Blue
Thanks a ton for your prompt replies. Much obliged & am investigating the various alternatives suggested by you guys.
Take care
anji