rear wheel bearings

[Bevel bob]

From memory one of the bearing outers does not sit tight against the hub but is spaced out a fraction by the internal spacer ,this ensures that the ball bearings are not pinched and pre loaded by the axle nuts . Well ,thats my theory anyway !!.

[LaceyDucati]

Bob
You are correct with your theory
Nigel

[Bevel bob]

Thanks Nigel, but I don't think I can claim credit for the theory, Most likely you told me in the dim and distant past.!!.

[tonyduc]

Following this post since I’m working on my MK III wheels and forks at the moment. The PO give me the rear wheel in pieces, there are 3 sealed type bearings, does that eliminate the need for the protective washer 77.210 which goes between the felt washer and the 060 bearing ? I assume it might because I don’t see that washer available anywhere. Also, does the 84mm distance pipe goes between the two hub bearings inside the hub? So this distance pipe causes the two bearings to stick out a bit rather than be fully seated ?
Thanks
Tony

[Duccout]

Hi Tony,

You do not need the protective washer if you are fitting sealed bearings. When fitting the bearings, I warm the hub up to make fitting the bearings easier, drive one home in the housing, fit the spacer that goes between them, and then tap the other bearing in, feeling for play in the spacer, until the spacer is just held in place by the bearings. If you drive it in too far, the bearings will be side-loaded and will not rotate smoothly.

Colin

[tonyduc]

Interestingly after pulling the bearings in the hub on my Mkiii, the internal spacer is not 84 but 60 mm in length. Everything else matches the sizes in the parts diagram and the whole assembly with Cush drive and brake drum fits right in the swingarm. The entire width of the hub alone is 92 mm, definitely not wide enough to fit 2 11mm wide bearings and a 84mm spacer. Just wondering if this hub might be from another bike ?

[Scottish888]

Need some help regarding the sprocket side spacers.
It looks like the spacer (with a smaller and larger dimension oppsite ends) to the inside of the hub at the cush drive side, is that correct?
It would seem to be correct according the the parts diagram and the Haynes manual
If so I do not have a spacer that fits between the swing arm and the cush drive, can anyone tell me the dimensions of this spacer please.

Kind regards
correct position?

d1.jpg

wrong position?

d2.jpg

[Duccout]

Hi Alex,

The internal spacer is a 'top hat' type, which slides inside the cush bearing, and the spacer that fits between the cush bearing and the swinging arm measures 15 x 25 x 13.5.

Colin

[Geordie]

This has got me thinking that what I assembled over a year ago is not what the parts diagram shows.

I think there is one constant and that is all the compression induced by the wheel nuts is transmitted through the inner ring of the bearings and their spacer tubes. The outer spacer on the cush side has a slight step which matches up to an inner ring. I made a new one with a flange to increase the contact area on the swing arm.

IMG_outer.jpg

That fits through a lip seal and bears on an insert in the 20x42 bearing secured by circlip. In the reverse side of the cush drive, there is a 15x35 bearing tight up to the 20x42.

IMG_inner.jpg

Although the assembly is as I received it, I now think it may be missing a shim of 15 ID and 20 OD to carry the thrust into the hub bearing. Its thickness I have to work out. It cant be much however as the whole assembly is a sliding fit in the arm.

I think you have to follow the logic of what was intended and assemble to suit, obtaining parts as necessary.

Ian

[Scottish888]

Thanks all,
I have that top hat spacer that fits inside the cush drive, so my top pic is correct.
I am missing that outer spacer, thanks for the dimensions. I'll need to have one made or try and buy a used one.
Regards,

Alex