Jaguar XJ (X350). Manual — part 353

Disassembly / assembly of subassemblies

Cylinder Head (12.29.22)

Special Service Tools

Valve Spring Compressor

303-252

Disassembly

1

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

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

Remove the bucket tappet and shim assemblies.

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

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Remove the valve collets.

3 . 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.

4 . Remove the valves from the cylinder heads.

4. Remove the intake valves.

5. Remove the exhaust valves.

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5 . Inspect the cylinder heads and the related components. <<303-00>>

6 . 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 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.

9. Install the valve springs.

10. Install the valve spring retainers.

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

•

Install the valve collets.

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