You seem to be replicating Hugo's findings, I think it might be time to remove the crank seal.
Gearbox oil level rising/Primary falling
- Thread starter tim welsh
- Start date
I'd just add at this stage that the Maughans crank seal I have if a turned ali component that takes a std G24 seal, and seals onto the back of the sprocket. The bearings themselves are standard.It has worked very well for many years.
Trev - know anyone that sells red dye?!! (cheaper than ATF?)
I guess that type of seal could act as a flap valve as it did on Hugo's machine, it would depend on which way round the seal was fitted and also whether the crankcase pressure has suddenly increased for some reason, oh the joys of Vincent ownership, never a dull moment.
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Peter, I think a standard lip seal would be too strong to act like a flap valve here. However, with the current trend of fitting non return valves in breathers to form a partial crankcase vacuum, maybe the crankcase would suck all the oil out of the primary case and the gearbox. 
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seal wear, due to high speed Tim, and since I drove behind you at Mischi's last year, I think thats the case.... anyway good that you made it all the way.
I would just strip the whole thingie down and start rebuilding....
thats why we need at least two driving vinnies...
all the best
Vincent
I would just strip the whole thingie down and start rebuilding....
thats why we need at least two driving vinnies...
all the best
Vincent
Hi, Tim- Judy and I too enjoyed our 103rd French rally( well, it feels like that) . I can't find out how to start a new topic on this forum!! We had a good slow ride home-apart from some issues with a back tyre that went flat for no reason! Thanks to Werner and the French section for the rally! See you all at the annual!
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Update on findings after stripping the primary:
Found the orange silicon I had put over the head of crankcase stud K had gone, so could explain loss of primary case oil (was leaking from near gearchange cover )(usual very relevant question Trev!), Re siliconed it.
Retaining ring for bearing in gearbox cover plate only finger tight (but split pins still in place). Tightened and loctited.
Replaced G24 seals in my crank seal, and in coverplate, both gone a bit hard.
Replaced 5 broken inner esa springs.
Gearchange pawl spring broken, explains slightly sloppy change recently.
Done 50mile test run, all back to "normal", levels ok so far. No idea how gearbox level went up!?
Glad you got back OK Alan and Judy, at least you had a centre stand for changing tyre?
Hello Vincent- are you going to Austria this year?
Found the orange silicon I had put over the head of crankcase stud K had gone, so could explain loss of primary case oil (was leaking from near gearchange cover )(usual very relevant question Trev!), Re siliconed it.
Retaining ring for bearing in gearbox cover plate only finger tight (but split pins still in place). Tightened and loctited.
Replaced G24 seals in my crank seal, and in coverplate, both gone a bit hard.
Replaced 5 broken inner esa springs.
Gearchange pawl spring broken, explains slightly sloppy change recently.
Done 50mile test run, all back to "normal", levels ok so far. No idea how gearbox level went up!?
Glad you got back OK Alan and Judy, at least you had a centre stand for changing tyre?
Hello Vincent- are you going to Austria this year?