Rick,
I have the same valve cover & had the exact same problem. The fix for me
was to rebuild the engine. Yea, it was blow by. I had three sets of
cracked rings. Before I realized the real problem I filled the hole,
made an aluminum oil baffle under the valve cover cap opening & used a
full cork gasket to seal off the blow-by. Eventually the oil still oozed
out from under the cap. For some reason these covers & the filler cap
don't seal as well as the originals & are susceptible to pressure build up.
Rebuilt motor, same valve cover, no problem.
--
Mitch Seff
Oceanside, N.Y.
75 TR6
http://www.angelfire.com/ny4/triumph5/
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