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Leaking valve cover & thermostat

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A

aroostok

Jedi Hopeful
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I have got a leaking valve cover problem I just can't seem to beat. I've replaced the valve cover gasket 3 times, the last time with one of the silicone rubber gaskets and I just can't seem to get the darn thing to stop spraying oil all over everything. I've got one of those nice chrome plated thingys with knurled cover nuts. Should I go back to an original (this was an original that was just chromed) and put another gasket on? If so, what kind of gasket should I use (cork or rubber?).
Last question, what temp thermostat should I be using for the winter up here in central Pennsylvania. It gets pretty cold.
 
Number one, I use a cork gasket sprayed with Permatex High Tac and have no leaks. Removes easly also.
Number two, I'd use at least a 180 degree thermostat up there, maybe even a 190. The 190 might be a little high when summer comes though. JMHO. PJ
 
You may have a crankcase pressure issue. There should be no pressure in the valve cover to make the oil spray out. A leaky valve cover gasket should only weep oil slowly. Check your crankcase breather. You should be able to blow through it easily. If not, soak it in acid or cut it open and replace the media, then weld shut again. Also check the PCV valve if you have one.

FWIW, I use cork gaskets with nothing on them and have no leaks.
 
If you are going to use the high tac, I would only put it on the side that goes to the VC, not to the head. I have always had good luck with the cork gaskets, but you may have other issues.

I would check the system for pressure as well. An easy way to check is to take the VC cap off while the car is running. If you feel a huge push of air, then you have an issue with the PCV/breather system.

As for the t-stat, a 180 should do nicely.
 
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