Board index Flathead Power-Technical Questions, Answers, and Suggestions Big Twin Flatties UL 40`s valve covers....

UL 40`s valve covers....

Moderators: Curt!, Pa

Post Mon Apr 10, 2006 11:45 am

Posts: 158
Location: athens,greece
Hi there,the rebuild of my U engine,tranny has finished at last......its running great so far(150miles)but i cannot get the the valve covers to seal,all the parts are good used oem ,but the springs are new.....i tapped them down onto the cork washer with the front of a screw driver gently a couple of times but this did`nt there any tricks???could they need more miles to sit right???any help would be great......Thanks....

Post Mon Apr 10, 2006 6:44 pm

Posts: 146
Location: Utah,USA

Post Tue Apr 11, 2006 12:38 am

Posts: 630
Location: belgium
YP you probably know but ... did you flatten the bottom cups(that hold the cork)so they sit flat on the gasket, when you assemble for the first time put the corks(inner tube cork also) in hot oil/water so they get flexible , or just change the corks for O-rings.
Mine is staying clean with the O-rings.

Post Tue Apr 11, 2006 11:07 am

Posts: 1643
Location: Interlaken, NY USA

I switched to o rings some years ago also. It stays pretty dry. If it's reallyl blowing oil, you might want to double check the breather timing. excess crancase pressure will force oil out all the cracks.
Dr. Dick

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