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Old Apr 3, 2011 | 08:12 PM
  #42 (permalink)  
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onehundred80
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Joined: Apr 2006
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From: Ontario
Default Re: Valve cover leak...

Originally Posted by MikeR
Nope.....

Funny that you should pop this up today.... I just re-did both sides on the Aero yesterday. They were leaking again and when I pulled the breather covers the gasket was stuck very well to the breathers but not to the valve covers.... so I made sure that I cleaned both really good again and used naptha on the valve covers to get all the oil off.... then I used a little(?) extra RTV material to make sure I got a good 'squish' on the bottom sides where they always seem to leak..
The secret to a good seal with RTV is a consistently wide and thick bead. That way when the parts are clamped together there is an equal force all around on the RTV. If you have a thick and thin bead the thin areas will have hardly any clamping force on them and blow easily.
An evenly spaced bolt pattern, evenly torqued bolts and evenly applied RTV will provide the best seal. I would say the breathers may possibly be unevenly clamped due to the screw spacing just by looking at them.
That's my opinion anyway.
 
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