BSA Owners' Club Forum

The BSA Workshop => Singles => Topic started by: Calum on 09 May, 2021, 18:57:54

Title: QD rear hub bearings
Post by: Calum on 09 May, 2021, 18:57:54
Hi all

Whilst I've been taking the gearbox out of the B31 I also stripped the rear plunger units (they've currently got no shrouds fitted and I wanted to check them for condition anyway). Good news is the bushes and columns are good woth only a very small amount of play detectable on the left hand one when dry.

Anyway whilst I had the rear wheel out I noticed the bearings feel quite stiff, and slightly 'notchy' but there is no play there at all. The bearings are sealed units, and look fairly recent (probably cheap ones). In my experience this feeling is usually as a result of too much interference on the bearing fit or a housing that is slightly out of round. I can check all that when I've got it apart but... I can't seem to get them out. Both bearings sit directly on the wheel spindle, not on a tube as shwon in the service sheets I have. Between the bearings is a spacer tube and as this is the same (or very similar) ID to the bearings I cannot get behind either bearing to drive them out. I assume they both butt up against shoulders in the hub itself. Does this sound right? If so how do I remove them? I have got bearing race extractors at work that I could probably employ if I removed the rubber seals...

From memory the bearings are RLS7 but don't quote me on that.
Title: Re: QD rear hub bearings
Post by: DAVE BRADY on 09 May, 2021, 21:16:36
Hi Calum,

Once the spindle is out the spacer tube can be moved to the side slightly so that a drift can be used against the inner race.  Moving it around to try to keep it square.  Obviously this renders the bearing useless. Make sure that you do not loose the spacer/ring washer thing that sits inboard of the right hand side bearing.

Title: Re: QD rear hub bearings
Post by: Calum on 09 May, 2021, 22:14:48
Hi Dave

Thanks for the reply, I did think the tube would move sideways but it didn't seem to want to when I tried... at least you've confirmed that it should so I'll give it another go and knock the bearings out. Yes the bearings will be getting replaced, fear not!