The valve cover gasket seals the engine head to help it run smoothly and prevent any oil leakage. A good indication of when it's time to replace the valve cover gasket on your Jaguar XJ6 is when oil begins to leak out of the engine head. You can replacing the valve cover gasket easily in a matter of a few minutes. With the right tools and instructions you'll be able to change your own valve cover gasket with no hassle.
Park your car on a level surface and open the hood. Disconnect the negative terminal battery cable.
Gently detach the PCV hose from the valve cover located on the engine head. Disconnect the spark plug leads attached to each spark plug by pulling on the boot (do not pull on the wires to avoid damaging the spark plug leads). Note: It's essential you remember exactly which lead goes to which spark plug.
Loosen and remove the valve cover mounting screws using a flat screw driver. Detach the valve cover and valve cover gasket from the head by firmly pulling it off (if the seal will not break, use a putty knife between the engine head and the valve cover to break the seal).
Clean the mating surface using a shop rag and engine degreaser until no oil or sealant residue remains. Apply a coat of RTV sealant to the pristine mating surface.
Install the new valve cover gasket, it will only fit in one way. Reattach the valve cover. Reconnect each spark plug lead in the exact manner in which they were plugged in before disconnection. Reattach the PCV hose to the valve cover. Reconnect the negative battery cable.
Turn the car on and allow it to run for a few minutes. Check the valve cover for any leakage.
