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MD problem identified How to fix

A

Anonymous-0

Well-known Member
Oil leak on gas side of my MD definitely coming from valve cover. I have tried to seal it with #2A permatex, tightening, etc. to no avail. I'm taking it apart today and starting over with a new gasket. Will also check trueness of valve cover. The replacement gaskets are not cork, they're sort of a fiber (I guess) so I'm wondering if any sealant should be used, and if so, what kind? I like the 2A permatex, but it just seemed to liquify when the engine got warm. Any advice appreciated.
 
Try some high temp silicone with no gasket.
Put a nice bead on but don't over do it so you don't get excess in the engine.
Put enough on so when it get's compressed it will spread nice and even without voids.

This will help if cover is not true.
Clean both surfaces with some acetone.
 

If the valve cover is straight and true, and the mating surface of the head is also straight and true, then the ONLY reason you would need any kind of sealer would be to keep the gasket in place while you install the valve cover.

If by chance there is a nick or two in the gasket surface on the head, a little dab of silicon gasket maker will cure it.

It might also be possible there is a stress crack in the valve cover.
 
Don't overtighten it, it'll warp the edge & cause leaks. You won't see the warping with the cover off, but it'll distort if you put too much pressure on it.

Keith
 
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