Question:
Why do my valve cover gaskets keep leaking?
I have an 89 Ford Crown Vic with the 5.0 engine and ny valve cover gaskets keep leaking. I have tried different gaskets(cork, heavy duty rubber and the ones with the metal inside) and after a couple of months the start leaking again all done by shop mechanics. Are they and I overlooking something?
Answer by gabriel
try replacing the PCV (positive crankcase ventilation) Valve
the pcv valve releases the excess pressure that develops under the pistons where the oil pan is
if you noticed , when you put oil in your car you pour it up top , yet the oil ends up in the oil pan which is on the bottom
when the pistons move up and down a pressure develops under them, which is in the oil pan, but that pressure moves up to the valve cover and , if the pcv valve is bad that pressure cannot escape through it and it starts busting out seals, in your case the valve cover seals
the pcv valve is that plastic fitting that comes out of the valve cover and has a hose attached to it and goes into the air intake somewhere
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The valve cover is made of sheet metal and probably has been over tightened and warped. Try a new valve cover or a lot of silicon gasket maker.
Even in the newest engines, a certain amount of combustion gases find their way down past the pistons and into the crankcase,causing gaseous pressure to build up in the engine. This pressure can easily cause gaskets to fail. To prevent this, all engines are fitted with a positive crankcase ventilation tube. The tube is fitted with a one way valve, and normally runs from the top of the rocker cover into the throttle housing of the carby. The expelled gases are recycled back through the carby and burnt. Suspect PCV valve blocked! Hope this helps. OZ
Like the other responses, I would first look in the pcv system. To check the pcv valve you have to pull the plastic or metal valve out of the valve cover. Start the motor and cover the bottom of the valve and feel the suction. You should here the valve clicking as you cover and uncover the bottom of the valve. If the suction feels weak, then spray a good carburetor cleaner through the bottom of the valve. The car may have a tendency to want to stall. Just grab the throttle and open it wider. You want to look at the blow-by coming out of the valve cover. If it seems excessive, then a compression test will tell if the piston rings are worn. The maximum differential between the highest and lowest cylinders should not be more than 20% or for example if the highest is 150 then the lowest should not be lower than 120. If you have a low one, you can do a wet test by squirting oil into the cylinder via the spark plug hole. If you get a marked increase in compression, then the rings are worn out. If a slight increase is noted then the problem lies in the valves. The best gasket to use is the rubber with the metal in the middle. Check for warpage by getting a straight-edge and see if you can get a feeler gauge to slide between the straight-edge and the cover. Check the condition of the grommet that holds the pcv valve. A dried out one will let oil seep and run to the corner of the valve cover. Too many times I have seen people change oil pan gaskets that are still good because the drip is on the lip of the oil pan. The same principle applies to your valve cover. Something may be leaking around the valve cover making it look like it is the cover gasket. The best way to check the source of the leak is the dye that glows when a black light is shown on it. Good luck on fixing the leak.