XJ (X350) V8-4.2L (2005)
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Position the fingers on the outer edges of the tappet. Make sure the recessed step on each finger locates on the edge of the tappet.
8. Tighten the special tool to compress the valve springs.
9. WARNING: The following operations require the use of compressed air. Always wear suitable eye protection.
CAUTION: Do not use a magnet to remove shims. Failure to follow these instructions may result in damage to the vehicle.
Remove, clean and measure the shim.
1. Surround the immediate working area with a cloth to retain any loose shims displaced by the compressed air.
2. Use special tool aimed at the edge of the shim to lift it from the tappet. Remove the shim from each tappet, noting the position of each one.
10. NOTE: Two shims within each procedure are possible to be replaced using the special tool.
Use the following formula to calculate the required shim thickness.
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Original shim thickness + measured shim clearance - desired clearance = required shim thickness.
11. CAUTION: Do not use a magnet to install shims. Failure to follow these instructions may result in damage to the vehicle
NOTE: Shims must be fitted with the size markings facing the tappet, not the camshaft.
Apply a light coat of engine oil to the replacement shim(s) and install.
12. Loosen the special tool to allow the valve springs to return to their normal position.
