urgent help needed please - rear wheel bearing

Mike Sands

Supercharged
Joined
Sep 18, 2009
Messages
243
Location
County Durham England
Ride
roadster 2012
I'm part way through assembling the rear wheel bearings spacers seals etc and here's the thing .... the bearing's in and seated properly on disk side. Circlip fitted. Wheel turned over and spacer dropped through centre. But now the spacer sits proud of the recessed shoulder by about 1.5mm. In other words if I were to push the bearing home, the end of the spacer would stop it going fully home by about 1.5mm. As it happens this would put the outside face of the bearing more or less flush with the outside edge of the housing, but it seems wrong to leave that 1.5mm air gap in there, and I would imagine the shoulder (which it ain't touching) is designed to ensure that the bearing sits properly square.
I measured the aluminium spacer at 17.8cm just in case they have sent me an incorrect one?
Any thoughts welcome
Thanks
Mike
 
can you have mixed up the spacer with another? did you measure the bearings or compare them against each other?
 
Offset inner race on either bearing?

Just guessing here but maybe it's not designed to hit the shoulder, hence the spacer.?
 
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That's what I'm hoping RnR. The spacer is the right length becuase it's the same as the old one taken out and damaged by the powder coater. I was wondering about an offset inner race if such a thing exists, but the part numbers seem to be right.
Mike
 
a weird one - the rear wheel takes 2 different sized bearings - 1 the same as the front two and 1 thicker one. If the bearing are correct, and as BigDoug says, the spacers are correct then they should fit in nicely. Its either the bearings arent correct (and in the correct sides) or the spacer is not the right one.
 
yeah .... don't forget the thinner bearing is already properly seated (and the circlip's in position) in the disk side. But with that side down and the spacer standing on the centre of that bearing, it's 1.5mm proud of the seat of the recess on the drive side. We've calculated (by measuring) that if the thick bearing was driven home until it mated with the end of the spacer, then the outer face of the bearing would be where it looks like it should be (ie flush with the machined hub). Taz is going to take a look tonight.
Mike
PS - it's almost as if there's supposed to be a thin oil seal inserted before the bearing, but nothing like that is shown on the diagrams
 
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