Jaguar XJ (X350). Manual — part 399

15

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CAUTION: During timing chain tensioner compression, do not release the ratchet

stem until the timing chain tensioner piston is fully bottomed in its bore or damage to the

ratchet stem will result.

Using a suitable tool, hold the right-hand timing chain tensioner ratchet lock mechanism

away from the ratchet stem.

16

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NOTE:

The timing chain tensioner piston should retract with minimal force. If binding occurs,

reposition the timing chain tensioner to eliminate side loading.

Slowly compress the right-hand timing chain tensioner.

17

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NOTE:

The retaining tool must remain in the timing chain tensioner until the timing chain

tensioner is installed to the engine with the piston bottomed in the bore.

Using a suitable tool, retain the right-hand timing chain tensioner piston.

18 . Install the primary timing chain tensioner assembly.

Tighten to 12 Nm.

19 . Release the tension in the right-hand timing chain tensioner.

Remove the retaining tool.

20

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CAUTION: While applying the opposing force to sprocket and chain, tighten the

sprocket bolt.

CAUTION: Make sure that a new bolt is installed.

Using the special tool apply force to the tool in an anti-clockwise direction to tension the

primary timing chain on its drive side.

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Tighten to 20 Nm + 90 deg.

21

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CAUTION: While applying the opposing force to sprocket and chain, tighten the

sprocket bolt.

CAUTION: Make sure that a new bolt is installed.

Using the special tool apply force to the tool in an anti-clockwise direction.

Tighten to 20 Nm + 90 deg.

22 . Remove the special tool from the right-hand cylinder head.

23 . Remove the special tool from the left-hand cylinder head.

Vehicles without supercharger

24 . Install the right-hand variable camshaft timing oil control unit housing.

Install new O-ring seals.

Tighten to 22 Nm.

All vehicles

25 . Remove the special tool.

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