Jaguar XJ (X350). Manual — part 495

Disassembly / assembly of subassemblies

Cylinder Head (12.29.22)

Special Service Tools

Valve Spring Compressor

303-252

Disassembly

1

.

CAUTION: Do not use a magnet to remove shims. Failure to follow these

instructions may result in damage to the vehicle.

CAUTION: If the cylinder head valve components are to be reused, mark the

position of the valve components to make sure they are reassembled in the same position.

Remove the bucket tappet and shim assemblies.

2 . Remove the camshaft position (CMP) sensor.

•

Remove and discard the 'O' ring seal.

3 . Using the special tool, compress the valve springs.

•

Remove the valve collets.

4 . Remove the valve spring retainers and valve springs.

1. Remove the valve spring retainers.

2. Remove the valve springs.

3. Remove the valve stem oil seals.

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5 . Remove the valves from the cylinder head.

4. Remove the intake valves.

5. Remove the exhaust valves.

6

.

Inspect the cylinder heads and related components. For additional information, refer to

<<303-00>>

7 . Remove the pipe plugs and alignment dowels as necessary to clean the cylinder heads.

Assembly

1

.

WARNING: Eye protection is required during use of compressed air. Failure to follow

these instructions may result in personal injury.

CAUTION: The cylinder head surface finish is measured in microns. For correct head

gasket sealing, avoid any contact of finish with metallic objects.

Clean gasket material, dirt and foreign material from cylinder heads. Wash with a suitable

soap and water solution and dry the cylinder head completely using compressed air if pipe

plugs have been removed.

2 . Install the pipe plugs and alignment dowels to cylinder heads.

•

Apply pipe sealant to plugs prior to installation.

3 . NOTE:

Lubricate the valve stems before assembly.

Install the valves into the cylinder heads.

6. Install the intake valves.

7. Install the exhaust valves.

4 . Install the valve spring retainers and valve springs.

8. Install the valve stem oil seals.

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