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r100gs - gear oil just won't stop leaking. WHY? r100gs - gear oil just won't stop leaking. WHY?
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  #1  
Old 30 May 2010
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Thanks for suggestions so far.

I am using a semi synthetic oil. 80/90 so I'll try and switch to plain oil to see if that works. I think the seal may be the older type. Speedo drive and earth screw are clear of blockages. The seal is mounted the correct way around with the spring facing the oil.

Alibaba, I was under the impression that the notch in the gearbox casing needn't be siliconed if it is of the newer small type. The last box I had required the silicon filling as it has a larger V shaped groove in it and then I drilled through a 1mm hole so that it could still breath out of this. This box has the newer smaller notch already and I thought the problem of oil leaking out had been corrected by the manufacturer so I didn't have to silicon this one. The notch is a lot smaller. You think it still needs doing? And you do still think I need to drill a hole back through it so that it can breath?

Thanks again
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Old 31 May 2010
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Quote:
Originally Posted by nico-la-vo View Post
Alibaba, I was under the impression that the notch in the gearbox casing needn't be siliconed if it is of the newer small type. The last box I had required the silicon filling as it has a larger V shaped groove in it and then I drilled through a 1mm hole so that it could still breath out of this. This box has the newer smaller notch already and I thought the problem of oil leaking out had been corrected by the manufacturer so I didn't have to silicon this one. The notch is a lot smaller. You think it still needs doing? And you do still think I need to drill a hole back through it so that it can breath?
The notch should always be completely filled (on a paralever).
All components have separated vents. The gearbox vents through the earlier mentioned bolt, bevel-box through the plastic-vent and the cardan-housing through the pivot bolts that attach it to the frame.

I have a bike with a late gearbox (1996) and when the notch was open it used 100 ml oil every 1000-2000 km. It's worse at high speed and mountain-passes.
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Old 31 May 2010
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Alibaba is as always on top of this

Yes - known BMW "personality"... or -fault-... depending on point of view.

You need to fill the hole with silicon.

I use Omega 690 80W/90.
www.smortknik.se
Magna Industrial Co. Limited
http://www.magnagroup.com/products/o...re/odis690.pdf

Surpriced that the shop that supplied the gearboxes to you did not know this... You -did- point out to them that you were replacing a GS/PD gearbox, right???...

Once sealed - no problem
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Old 31 May 2010
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Thanks guys, will seal the hole. Do you think there is any way of doing it without removing the driveshaft?
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Old 31 May 2010
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Originally Posted by nico-la-vo View Post
Thanks guys, will seal the hole. Do you think there is any way of doing it without removing the driveshaft?
Yes (read my first post).
It's even possible to do it with the swingarm in the frame but you will have a hard time to get the boot back on.
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Old 18 Jun 2010
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I Had a problem with oil leaking out of the "V" groove on the output seal casing had two atemps of trying it fill it with siconce but that did,nt work, when l changed the seal the third time l filled the groove with JB weld and sanded it with fine grade wet and dry to make a good finish, 10,000 miles later and i,ve had no leaks.
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Old 11 Aug 2010
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just out of interest, did you get the box from sherlocks?
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