free website stats program Rocker box gaskets leaking | Harley Davidson Forums

Rocker box gaskets leaking

goody

goody

New Member
1995 FLHTC-U, my rocket box gaskets are being pushed out after I had rebuilt the cylinders due to a blown head gasket. I rebuilt everything according to the manual, and have no problems with the exception of the gaskets. The rocker covers were placed on, centered and torqued to specs. I havent horsed on the engine and the gaskets was pushed out very quickly.
What could cause this?
 
Normally the lower rocker gaskets are the ones that leak there is a one piece metal gasket as a replacement this doesn't seem to have any problems
i bought a rocker box gasket kit using the hd part number for the kit and got the new gaskets in it

Brian
 
This isnt the lower gasket. I do have the metal gasket on the lower case. The gasket pushing out is the one between the top and middle case.
Mike
 
I remember it was a reoccuring Evo problem, seems like it was most often the left rear.
Harley made many revisions, and I don't think they ever got it right, problem seems that the mating area is very narrow and they squish. I think the ones I used on my '92 were Comotec, still dry. There were also some other good ones James and Janes? Gosh, that was 14 or more years ago.
 
On my `89 the middle part became warped, it was bowed out so that the gasket would not seal. Into the scrap pile they went. I replaced them with units from Drag Specialties, quite a bit less money than the dealer wanted.
 
I had a similar prob. with an evo motor. The top rocker cover gasket did the same thing when i tightend the bolts. The gaskit surface seemed to have a groove. except in a radiused area in the front of the head. And this is where it pushed out or in. Gaskits didnt cost that much. So I got a new one until it finally sealed. One thing that helped though. I cleaned the surface area real good with brake cleaner removeing all the oil. With the rocker cover real clean and dry it sealed. It drove me crazy til I got it to stop leaking. The gaskit that did the trick was a gray one, the black ones didnt work. Best of luck.
 
I had real good luck with a simular problem on my '07 sportster. My front valve cover started to seep, so I did some research on different gasket companys. I ordered a rocker box gasket set from a company called "Cometic" and had very good success with a good seal 1st time around.
If you're interested check them out on the Web or their phone # is (440)354-0777. They have all types of Gaskets for Harleys... Good Luck.
 
Thanks for the info. I did all the above (cleanliness, etc) It just seems like there is too much pressure in the rockers? somehow? Someone was talking too high crank pressure, but I dont know how that could occur or be corrected. I will look into Cometic and new covers at Drags to see how different they are.
Mike
 
You must log in or register to reply here.
Back
Top