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[Rodders]

I know this topic has been aired plenty of times. I just wondered if anyone has had success with using a sealant (like Permabond 130) instead of the rubber O ring? On my 500 Twin I've tried just about everything - larger size O ring, sealant and no sealant, had the face of the outer case shimmed (surprisingly it was bowed outwards creating a gap in the centre, which it from where it still leaks). Using a torque wrench I've tried low tension on the central bolt, starting at about 8 lbs, checking for leaks and then trying more rising to 14.
I suppose the inner case might be deformed.
Anything I haven't tried? (positive suggestions only please).
Thanks

[stinkwheel]

How about checking how the two halves meet with engineers blue so you can see where the gap is.

[Rodders]

ok thanks for that- will give it a try

[Pike]

The same problem I had with my 500 Twin. I realized finally that the leak was between the mainshaft and the inner primary cover. Worth checking. Solved after installing new sealing there.

[PeteF]

Pike beat me to it.
Gearbox shaft seal!
Check by cleaning everything first then after a run you will see where it's coming from.

[Creaky45]

How about checking how the two halves meet with engineers blue so you can see where the gap is.

I agree. I presume your twin is similar but on my Bullet I had to grind down the part where the bolt goes through when I found the two surfaces were still not touching no matter how tight the nut was. . Check this with no gasket and you will probably even be able to run a feeler gauge round the edge. I cheat a bit and put silicone sealer on the rubber gasket as well but it it now pretty much sealed.

[Rodders]

Thanks for those suggestions. I've just had the gearbox out and replaced the oil seal. It's definitely running our of the bottom of the casing - I'll try the engineers blue and make sure the bolt facings are obstructing the sea. Chapter 10 in the battle commences!

[stinkwheel]

Incidentally. I don't actually have any engineers blue so I degrease the surfaces then scribble on one with a sharpie....

[vince]

Hi, had the same problem, to level the outer plate I sanded it down on a wet paving stone. Use a circular motion. It was surprisingly quick to do. Vince