Grand Prix 500
Main Motorcycle: 1976 Triumph Bonneville
Join Date: Feb 2009
Location: Canoga Park, CA
|Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.|
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Give this a thought, there is no seal where the front sprocket go's on the main shaft high gear splines, I know it's a pain, but to seal this at least you don't have to take the tranny apart, just the primary, with the front sprocket off - clean it's splines and then the splines it slides onto, a very light coat of RTV on both sets of splines should clear up tranny oil coming out and getting whipped around by the chain making a mess.
I just went through all this myself.
Your Youtube video reveals the problem - your mainshaft 5th gear or the roller bearing it runs in, or more likely both, are absolutely shot. That is miles too much movement in all directions, and will definitely let oil spew out - there can be barely a moment's 360 degree contact between the sprocket and the oil seal when the bike is moving, or even just running.
You're going to have to strip the gearbox I'm afraid. But don't worry about it - it is not difficult to do and you won't need any special tools beyond what you must already have. The genuine Triumph manual explains reasonably well how to do it all, and it is virtually impossible to reassemble it wrong.
If you want better pics and instructions, Plewsy's videos almost ecertainly include a gerabox strip & rebuild, and if you go onto the T140.com forum, you can find an excellent illustrated gearbox strip & rebuild on there.
Don't despair - you've got to the bottom of the problem, just hope that the 5th gear bearing hasn't spun in the housing as that would mean an expensive repair.
Good luck with it, and let us know how you get on!
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