Wandhoop
Just got it firing!
I have a 1980 T3 with cast wheels - I suspect from a slightly later 1000 SP. All has been fine until an intermittent grinding noise from the rear wheel. At first I thought it was a stuck brake caliper catching on the disc but it wasn't that. Closer inspection with the caliper removed I found that the wheel only turned freely for perhaps half a turn before 'binding'. In the position where it could freely turn the wheel could be rocked side to side, suggesting a loose bearing.
I removed the wheel and found that the bearing on the right hand side (drive side) is loose in its housing. See picture.
The outer race of the bearing 'rocks' in the wheel (which is what I could feel when the wheel was on the bike). The Flexible Coupling Disk (GU14335203) or "Drive Plate" - the part that has the splines on the other side that fits into the cush drive rubbers - is locked solid onto the wheel. I would have expected to be able to slide it off? Looking at the parts list I think there is a 'hub' (GU14632250) that the drive plate slides over? Number 14 in this picture.
I'd then expect the wheel bearing itself to fit into this hub? That way the wheel is turning on the axle via the hub and the drive from the engine is via the drive plate and cush rubbers. Can anyone confirm if my understanding is correct?
Looking closer at the wheel bearing (picture below) it appears that some of the hub has broken away which is why the bearing is not fully supported and thus moves about.
To the bottom-right you can see metal between the bearing outer race and the drive plate splines but around the top this is missing - what metal you can see is further below the upper edge of the bearing.
I'm reasonably competent maintaining my own bikes (have Brits and previous Italian) *but* I really don't want to damage anything further nor buy any parts that I don't need (they're all expensive!) without getting advice from folks that have perhaps had one of these wheels apart before.
My questions in summary are:
1. Does the wheel bearing mount in the hub?
2. How does the hub fit into the rest of the wheel? Is it a 'fit once' or can it be replaced? If it is the root cause of my problem is the whole wheel basically scrap?
3. Should the drive plate 'just' lift off the hub?
4. Am I getting this completely wrong?
I'm in England, UK if anyone wants to recommend suppliers, etc.
Thanks in advance!
Miles