Replacement of rear drive box seals

[Guzzirider]

I noticed when I arrived in Ulster that I had some oil on the right hand side of my rear wheel- nothing to write home about, but after a few hours at 80mph on the way home, the leak had got a little worse and there was some on the edge of the tyre. There was no flood of oil dripping down from the box, but just a small stain indicating a small leak.

 

All the bolts are tight, and I don't think it is the breather so I am guessing I may need to replace the seal(s), a job which I have never had to do before.

 

Looking at the parts manual there are two seals, part numbers 90403850 and 90706958.

 

Am I likely to need to replace both seals? Do I need any special tools for the job?

 

Any advice much appreciated.

 

Cheers

 

Guy

[pasotibbs]

I noticed when I arrived in Ulster that I had some oil on the right hand side of my rear wheel- nothing to write home about, but after a few hours at 80mph on the way home, the leak had got a little worse and there was some on the edge of the tyre. There was no flood of oil dripping down from the box, but just a small stain indicating a small leak.

 

All the bolts are tight, and I don't think it is the breather so I am guessing I may need to replace the seal(s), a job which I have never had to do before.

 

Looking at the parts manual there are two seals, part numbers 90403850 and 90706958.

 

Am I likely to need to replace both seals? Do I need any special tools for the job?

 

Any advice much appreciated.

 

Cheers

 

Guy

Its not a terrible job (unless the leak is from the pinion seal) as you should not need to remove the pinion gear ( a real pain).

 

Thread here

and here (the tread I posted pics in)

 

Seals for bevel box are...(prices are 3 years old)

 

BRTS70X85X8 OIL SEAL £1.64 +VAT

BRTS32X52X7 OIL SEAL £1.03 +VAT

BRTS37X55X8 OIL SEAL £1.64 +VAT

BS163 O RING £0.50 +VAT

from reading the thread it looks like I found one seal size to be wrong (38x50x7 instead of a 37x55x6 ) but as thats not on the list I'm not sure if there is another seal ?

I have a bearing puller if you need it (I can't remember) just PM me.

[richard100t]

The large outer seal is very easy to do. Just take the wheel off & pry the old one out & press a new one in.

The smaller inner seal will require a bearing puller to get at it. I just had this done to my drive & after watching how its done I would say..go get a puller & have a go at it.

Try just replacing the easy one first though to see if that does it

[Guzzirider]

Excellent! Thanks guys!

[mike wilson]

You should be able to hire one of these, in the correct size.

http://www.cromwell.co.uk/KEN5034720K

 

The separator part is also not so expensive to buy. The rest can be fabricated.

http://www.cromwell.co.uk/KEN5034520K