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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Common problem when the gearbox sprocket leaks oil out and down behind the primary side.
How it would weep out of the crossover l/h gearchange bracket that runs thru the cover is a mystery. . .
There is an o-ring to be usedto help seal this problem,
Problem is - you have to go in deep to get to it.
The rather large o-ring is the same part # as is a Trident something or other?
Memory fades. . .
Seems very strange. Even if a lot of gearbox oil was making its way along the crossover shaft into the chaincase, it would surely first of all run into the bottom of the case and come out of the drain hole (which you say has the plug removed). There seems no rational reason why it should progress horizontally (or even at a slight angle if leaning to the left) along the 'U' portion of the shaft and then the final straight piece to the outside world!
I suppose if there is greatly excessive clearance between the shaft and the bore in the chaincase cover, any internal pressure could cause any oil mist to escape (if it weren't for the fact that no pressure could build up if the drain plug has been omitted). So sorry, no idea, but please do let us know when you've sussed it!
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