SOHC.co.uk Forums > CB500/550

rear hub snag

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mickwinf:
ok so i am rebuilding the rear hub on my 500 and have hit a snag. It is a refurbished hub with all new bearings and cush drive rubbers, the issue is when I try to replace the sprocket carrier assembly. If i use the d ring seal the carrier will not sit down enough even when i tighten the retainer ring down as tight as i can get it. If assembled without the seal everything looks fine. Is the seal too thick? is it necessary at all?
help please!

Oddjob:
Which way round have you got the D ring fitted Mick? round side up or round side down?

mickwinf:
Ken I am a bit confused about this, I have seen other posts, but if I am doing this correctly it fits around the bearing housing? The seal has the flat side on the inside diameter of the seal so both upper and lower edges of the outside diameter have a round edge, therefore either way up is the same? It seems to me an ordinary o ring would work just as well.

McCabe-Thiele (Ted):
Someone else here had this problem a couple of months ago iirc - was it the bearing not fully home?

Oddjob:
There is some debate on the forum Mick on which side of the ring sits uppermost. The groove it sits in is flat, so you'd think the flat side of the ring goes against the flat side of the groove leaving the round side uppermost. However it an also be fitted with the round side down, this leaves the flat side uppermost and it makes some sense for that to be the way as it would mean it seals better (more contact area) and the reduced profile would also allow the sprocket carrier to slide on easier.

Which as you say makes you wonder why they fitted a flat sided or D shaped oring in there in the first place, if it sat round side up then surely a round oring would do the job as well, or is it flat so it doesn't twist out of shape as the carrier slides over it.

My head says it fits flat side up, which way have you got it ?

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