Car Service and Repair Guide car maintenance, installation instruction, service, repair, fault-diagnosis and troubleshooting guide

The following passage outlines the engine in-car repair procedures for the Jaguar XJ6 sourced from the vehicle Service and Repair Manual published in 1997. The models covered are Jaguar XJ6 with 3.2 litre, 3.6 litre, 4.0 litre six-cylinder in-line DOHC petrol engines and automatic transmission.

To remove the valve cover, follow these steps:

1. Disconnect the battery negative cable. Caution: If the stereo system is equipped with an anti-theft system, ensure you have the correct activation code before disconnecting battery.
2. Detach the PCV hose from the valve cover. Disconnect the PVC hose (arrowed) from the valve cover, the pull the spark plug leads out by their boots, not the leads (refer to illustration).
3. Remove the spark plug leads from the spark plugs, handling them by the boots and not pulling on the wires.
4. Remove the valve cover mounting screws, then detach the valve cover and gasket from the cylinder head.  If the valve cover is stuck to the cylinder head, bump the end with a wood block and hammer to jar it loose. If this method does not work, try to slip a flexible putty knife between the cylinder head and valve cover to break the seal.

To refit the valve cover, follow these steps:

1. The mating surface of the cylinder head and valve cover must be clean when the valve cover is installed. Oil leaks may develop if there’s residue or oil on the mating surfaces when the valve cover is installed.
2. Apply RTV sealant around the two half circle rubber plugs at the rear of the cylinder head. Apply RTV sealant to the half-circle plugs and insert them into the cylinder head before refitting the valve cover.

   

3. Using a new gasket and spark plug tube seals, refit the valve cover. Press the valve cover gasket into the groove around the valve cover and fit a new set of spark plug tube seals (arrowed)

   

4. Tighten the screws to the torque.
5. Refit the remaining components, start the engine and check for oil leaks.

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