I know this has been discussed with “burping” but i wonder if any one can help me please with my specific problem…
As you can see from the photo I have a worryingly large amount of bevel drive oil escaping from the bottom plate, this after 160 miles and have cleaned and inspected the surfaces which look good… new gasket and Hylomar Blue. This may be a recurring problem with this bike as the previous owner has fitted a valve on the filler nut (which is clean and working). So despite this there must be an awful lot of pressure in there. Does anyone have any thoughts on this as Im getting increasingly wary of right hand bends!
Thanks David
been here, 850T3 - although I’m not so confident of my pyschic abilities that I can claim your problem to be the same as my problem!
First off, repeating advice passed to me, in similar circumstances: “a very small amount of oil can look like a lot”, so maybe breathe a wee bit.
Secondly: are you 100% sure this is coming from the final drive - again, advice given to me: clean the tyre (and wheel rim), clean the rear drive box, clean the rear of the gearbox, centre stand, and the sump (particularly in the area around the drain plug) and then go for a short run before inspecting again.
The reason for this advice, given to me, and (in my case) relevant to diagnosing the real problem, is to put yourself in a position to see where the oil is coming from, as opposed to be being distracted by where the oil is. In my case, with similar evidence on the back tyre and rim, I have had oil leaks (requiring attention) from the gearbox, and from the slot between gearbox and engine block. In both cases, a small amount of oil was easing out onto the sump and/or gearbox and rearwards to the wheel - but in both cases, oil on the centre part of the centre-stand was evidence that it was coming upstream of the final drive. Of course, in your case, it may be the final drive, but clean clean and inspect is, I think, still a good way to go in the first instance. HTH!
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Agree with the above advice. I had a persistent drip from the rear crank oil seal, through the drain slot at the bottom of the flywheel housing, onto the stand, and which found its way eventually to the tyre.
Presumably a gearbox leak could do the same.
Good luck!
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Barry… thanks so much for this very sensible advice… I’ll do as you say and see where we get to and if I may keep you posted.
Best David
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Thanks Simon… good to know this stuff has happened to other people!
Best David
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Take wheel off, if oil is on hidden inner part of hub and inside or around FD output shaft, is failed oil seal. If lucky wil be outer (large) only, which can be replaced without splitting the box. But again can also verify this by cleaning all areas then see if oil leak reccurs (and where).
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There is also an engine breather, if you have over filled the engine it could be coming from there.
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I had this happen with a modern V7 II (2015) model. Exactly the same pattern of oil streaks on the rear tyre that you show in your photos.
As suggested by Mike_H above it was the bevel box oil seal rather than the filler/pressure relief valve, and simple replacement fixed the problem.
I hope this helps,
Jim
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Have this on my T as well. Turns out one of the ancient Koni shocks has a knackered seal and is shedding oil onto the wheel. It’s not much, but looks like it is.
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There should be no need for a valve on final drive filler plug. It looks to me as it’s simply a breather though. Either way oil may be thrown out through this rogue part and drip down onto wheel rim. Difficult to overfill but check there isn’t excess oil in FD and it’s correct grade as well.
Richard
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Forgot to mention, if you are certain it’s from cover plate area, did you use paper gaskets each side of crown wheel shim?
Richard
