Tuesday, May 27, 2014

How to change the valve cover gaskets on your Jaguar with a 4 liter engine

These are the parts for the non variable valve timing engine (1997 and 1998).
  1. Valve cover gasket passenger side: Passenger Right Engine Valve Cover Gasket Eurospare Brand NEW
  2. Valve cover gasket driver side: Eurospare Driver side Valve Cover Gasket
  3. Spark plug seals x 4: Eurospare NCA 2578BB Spark Plug Tube Seal
  4. Valve cover bolt rubber washers x 28: URO Parts NCA2575CA Valve Cover Bolt Seal
For an 1999 and up (4 liter motor not 4.2) there is a very convenient and cheap set available: Victor Reinz VS50397 Valve Cover Gasket Set

Here is the procedure for removing and replacing the valve cover gaskets on your 4 liter Jaguar engine.
  • Remove the air cleaner ducts:
    • remove the two bolts that secure into the throttle body
    • remove the clips that secure it to the air cleaner housing
    • unplug the Mass air flow sensor
    • unplug the engine breather hose 
  • Remove the air cleaner housing
  • Remove the six 7 mm bolts of the coil's cover:

  • Make sure your are putting all of the bolts in boxes and in an organized way (saves you headaches later). Remove the eight 7 mm bolts securing the coils, I don't like unplugging them since they love to come apart, so i just undo the bolts and place the whole harness with coils on top (you can see this on the next pic) As you can see the connectors on the coils of this car were already apart (I didn't do this!)

  • Remove and place the coils on top. Make sure you don't bend the wires too much, you do not want to create a misfire. A good tip is to spray the coils with brake cleaner if they are full of oil. Pulling the rubber boot out of the coil and stretching the spring slightly would ensure good contact with the spark plug.

  • Remove the fourteen 10 mm bolts and remove the valve cover. Notice that the only bolt that truly comes out is the top left one, the others remain in the valve cover. There are two harnesses that you have to detach before removing the valve cover, one in the back (this is the harness that holds the coils) and on in the front (for the maf). The harness in the front attaches in to places. If you can't find the then pull carefully on the valve cover and you'll see what's holding you from taking it out. As soon as is out, make sure you cover your engine so nothing falls in.

  • Place the valve cover on the work bench and remove the bolts and studs. Make sure you know the specific order in which they go back. If you lose the order just look at the top pics. Remove the old gaskets from the valve cover. Make sure you also replace the gaskets for the spark plug holes. When all fourteen bolts are removed, hit the valve cover with degreaser and a garden hose, wipe it with a rag as best as you can and let it dry in the sun (or air dry it if you can). Make sure is completely dry before putting it back.

  • Clean the bolts with some brake clean and a rag, remove the old rubber washers and put the new ones in place. With the valve cover dry place the new gaskets in place, don't forget the two gaskets for the four spark plug holes. Then push all the bolts back in place, the gasket will hold them.

  • Clean the Surface of the engine with brake clean and an emery cloth.

  • Place the valve cover back in place, and tighten the 14 bolts, first BY HAND, then with a 1/4 inch ratchet. Make sure they are tight but don't brake them. The exact torque if you have a torque wrench is 11 Nm. Place the coils carefully back in place, make sure you don't mess with those wires too much.

  • Place the coil cover and its six bolts back in place, and place all the air cleaner ducts back.

  • Now you can move to the other side. The difference is that you don't have to remove the air cleaner ducts. But you do have to remove a little nut that holds the dipstick tube in place, and wiggle the dipstick out of the way. Also you have to remove the pcv hose, and when you have the valve cover out, you want to make sure that the pcv tube is unclogged with a thin straw, like the one that comes with your brake cleaner. 


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