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valve cover gasket on Allis B

O

old wheels

Member
Recently I had my motor on my B rebuilt & have it up & running but the valve cover gasket is leaking extremely bad. Is a rubber type gasket. Looking for suggestions on how to correct this? Would a cork type gasket work better? I've tightened it down snug but it does not seem to be seating. Is it possibly to take the valve cover off of the engine without taking the hood off? Thanks in advance.
 
Hood has to come off to do the job correctly. Not even sure you could get it off with out doing so and have not tried. As for the gasket the valve cover maybe twisted and if it is which is sort of common it can be very hard to get one to stop leaking. My self I like to use a small amount of silicone sealer on the gaskets and I also make sure that I do not tighten them down to hard or they will leak. there is a fine line between good and to tight
 
Check the top of your valve cover to make sure that some time or other it was tightened to tight and indented around the holes. Check to make sure that a thick washer was used under the rocker arm hold down nuts to cause the valve cover to set on the nuts tight rather than be tight on the gasket.(the bolt hole being indented will also cause this)
If all of this is not causing the problem check the oil line and fittings that go to the head. If a hardware Tee has been used instead of the original tee it would not have the restrictive orifice that limits the amount of oil going to the rocker arms. If that would be the case you could have more oil on the top of the head than can get away on the manifold side and ends.

The most common cause that I have seen is the thick washer under the rocker hold down nuts. I have taken them apart that had a flat washer then a lock washer under the nuts. That just don't work.
 
From what I have found the replacements were a little thin. A good coat of permetex on both sides solved my problem.
 
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