Gearbox oil leak

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GaryK
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Gearbox oil leak

Postby GaryK » Fri May 08, 2020 12:16 pm

Hi all. I have quite a bad oil leak from 57 vh gearbox at the spocket end. Presumably it will be from the sprocket oil seal. Can this be replaced without removing the gearbox?
Thanks for any help
Gary

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Steven.Carter
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Re: Gearbox oil leak

Postby Steven.Carter » Fri May 08, 2020 12:36 pm

Yes you can, just about the whole gearbox can be dismantled in situ

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Re: Gearbox oil leak

Postby will_curry » Fri May 08, 2020 2:13 pm

There are three blanking plugs on the sprocket side of the gearbox which seal the
ends of the layshaft and selector forks. These are easily overlooked - it must be
easy, I did. In my case not only was the oil seal behind the sprocket mutilated
but the bottom selector fork plug was missing too.

GaryK
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Re: Gearbox oil leak

Postby GaryK » Fri May 08, 2020 4:48 pm

Thanks.
So presumably I would need to just take off the primary chain case to get to it.

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Re: Gearbox oil leak

Postby will_curry » Fri May 08, 2020 6:04 pm

Unfortunately yes. If you have the fully-enclosed rear chain some of that
has to come off too. I was lucky, mine didn't and I can confirm it is easier
the second time . . .

GaryK
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Re: Gearbox oil leak

Postby GaryK » Fri May 08, 2020 6:40 pm

OK thanks. I've no chain case either.
Right , I'd better get a new seal ordered.

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Re: Gearbox oil leak

Postby pete.collings » Fri May 08, 2020 7:44 pm

You might want to get a new sprocket spacer as well, if the oil seal rubber has hardened, it can wear a groove in the relatively soft metal of the spacer, and sometimes this can be the main point of an oil leak. The length of the spacer varies with the gearbox type, FWH models have a longer spacer, check that the two rear sprockets are in line after fitting the spacer to lessen any rear chain wear.

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Re: Gearbox oil leak

Postby JohnnyBeckett » Fri May 08, 2020 8:33 pm

HI you will have to take the inner and outer cases off and the clutch and sprockets off pull the oil seal spacer off then get two bent picks under the seal and pull it out or drill two small holes in the seal and put two screws in and pull the seal out and if the blanking plugs are leaking clean them and put some silicone on them :)

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Re: Gearbox oil leak

Postby GaryK » Sat May 09, 2020 9:53 am

Ok thanks for the advice

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Re: Gearbox oil leak

Postby GaryK » Tue May 26, 2020 7:38 pm

Hi all
I've removed the outer chain case, primary chain and chain wheel, but now struggling to take off the shock absorber nuts. Is there a easy way of removing them?
Also how easy is it to take the whole gearbox out?


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