1998 JAGUAR X308 head bolt

Installation


12. Remove the bolt which secures the sprocket to the exhaust
camshaft.
Move the sprocket forward from the camshaft boss.

13. Remove the secondary chain tensioner.
1. Remove the two bolts which secure the tensioner.
Lift the tensioner, sprocket (release it fully from the
camshaft) and ch ain assembly.
2. Remove the tensioner rearward from between the chain.
14. Remove the sprocket if required, or leave it in the chain
resting on the cylinder head.
15. Clean and inspect all relevant components.

1. Install the sprocket to the secondary chain.
1. With the sprocket installe d to the chain, temporarily
position (do not install the securing bolt) the sprocket
onto the camshaft.
2. Adjust the position of the sprocket within the chain to
allow the chain tensioning tool 303-532 to be
approximately vertical, as shown.
Remove the chain tensioni ng tool; during future
operations, do not move the sprocket within the chain.
2. Push the tensioner piston into the body to provide clearance
for installing.
1. Insert a thin rigid wire th rough the hole in the end of
the tensioner piston to displace the ball from the non-
return valve seat.

Installation

removing the bolt which secures the sprocket. 1. Place a flat piece of stee l strip along the timing cover
horizontal jointing face, adjacent to the exhaust
camshaft sprocket.
2. Secure the steel strip in place with adhesive tape.

11. A ball-ended hexagon drive bit is required to remove the
sprocket securing bolt. A suitable tool is available from Snap On as (FABLM10E) Long Series 10mm AF.

12. Remove the bolt which secures the sprocket to the exhaust
camshaft.
Move the sprocket forward from the camshaft boss.

13. Remove the secondary chain tensioner.
1. Remove the two bolts which secure the tensioner.
Lift the tensioner, sprocket (release it fully from the
camshaft) and ch ain assembly.
2. Remove the tensioner rearward from between the chain.
14. Remove the sprocket if required, or leave it in the chain
resting on the cylinder head.
15. Clean and inspect all relevant components.
1. Install the sprocket to the secondary chain.
1. With the sprocket installe d to the chain, temporarily
position (do not install the securing bolt) the sprocket
onto the camshaft.
2. Adjust the position of the sprocket within the chain to

Installation


12. Remove the bolt which secures the sprocket to the exhaust
camshaft.
Move the sprocket forward from the camshaft boss.

13. Remove the secondary chain tensioner.
1. Remove the two bolts which secure the tensioner.
Lift the tensioner, sprocket (release it fully from the
camshaft) and ch ain assembly.
2. Remove the tensioner rearward from between the chain.
14. Remove the sprocket if required, or leave it in the chain
resting on the cylinder head.
15. Clean and inspect all relevant components.

1. Install the sprocket to the secondary chain.
1. With the sprocket installe d to the chain, temporarily
position (do not install the securing bolt) the sprocket
onto the camshaft.
2. Adjust the position of the sprocket within the chain to
allow the chain tensioning tool 303-532 to be
approximately vertical, as shown.
Remove the chain tensioni ng tool; during future
operations, do not move the sprocket within the chain.
2. Push the tensioner piston into the body to provide clearance
for fitting.
1. Insert a thin rigid wire th rough the hole in the end of
the tensioner piston to displace the ball from the non-
return valve seat.

Installation

removing the bolt which secures the sprocket. 1. Place a flat piece of stee l strip along the timing cover
horizontal jointing face, adjacent to the exhaust
camshaft sprocket.
2. Secure the steel strip in place with adhesive tape.

11. A ball-ended hexagon drive bit is required to remove the
sprocket securing bolt. A suitable tool is available from Snap On as (FABLM10E) Long Series 10mm AF.

12. Remove the bolt which secures the sprocket to the exhaust
camshaft.
Move the sprocket forward from the camshaft boss.

13. Remove the secondary chain tensioner.
1. Remove the two bolts which secure the tensioner.
Lift the tensioner, sprocket (release it fully from the
camshaft) and ch ain assembly.
2. Remove the tensioner rearward from between the chain.
14. Remove the sprocket if required, or leave it in the chain
resting on the cylinder head.
15. Clean and inspect all relevant components.
1. Install the sprocket to the secondary chain.
1. With the sprocket installe d to the chain, temporarily
position (do not install the securing bolt) the sprocket
onto the camshaft.
2. Adjust the position of the sprocket within the chain to

15. Loosen the bolt which secures the VVT unit.
Do not tamper with the three bolts which secure the VVT
mechanism to the sprockets. It is sealed at the factory to
the correct valve timing specif ication for the engine and is
supplied only as a complete unit.
16. Remove the primary chain tens ioner. Refer to operation
12.65.55, in this Section.

17. Remove the primary ch ain tensioner blade.
1. Remove the pivot bolt which secures the tensioner blade.
2. Remove the tensioner blade.
18. Reposition the VVT unit along the cam journal to allow the
chain to clear the head casting.
Disconnect the primary chain from the VVT unit and
reposition it against the crankshaft sprocket.

19. Remove the VVT unit.
1. Remove the securing bolt from the VVT unit and the exhaust cam sprocket.
2. Remove the VVT unit, exhaust sprocket and secondary chain as an asse mbly (release the chain
from the tensioner which is still secured to the
cylinder head).
Remove the secondary chain from the VVT unit and the
sprocket.

Installation
20. Clean and inspect all relevant components.

1. Push the tensioner piston (secon dary chain) into the body to
provide clearance for fitting.
1. Insert a thin rigid wire th rough the hole in the end of
the tensioner piston to displace the ball from the non-
return valve seat.
2. With the wire in position, press the piston fully into the tensioner body.
Remove the wire.

2. Fit the VVT unit to the engine.
Assemble the VVT unit, the exhaust camshaft sprocket
and the secondary chain, in pr eparation for fitting to the
engine.
1. Fit the above assembly to the camshafts with the chain correctly positioned over the tensioner; VVT
unit to the inlet and the sprocket to the exhaust.
2. Fit, but do not tighten, each bolt which secures the VVT unit and the exhaust sprocket to the camshafts.
Allow the VVT unit sufficien t space to fit the primary
chain, in a la ter operation.

3. Fit the chain tensioning tool 303 - 532 to the exhaust camshaft
sprocket.
Reposition the sprocket (and the VVT unit) for the most
advantageous position for use of the tool.
Remove the tool.

4. Refit the primary timing chain.
1. Lift the primary chain an d position it over the VVT
unit sprocket (the VVT unit mu st be pulled forward to
clear the cylinder head casting). There must be no
slack on the drive side of the primary chain and the
VVT unit must not be rotated on the camshaft.
2. Slide the VVT unit fully on to the camshaft.
5. Fit the primary chain tensioner blade.
1. Position the tensioner blade to the cylinder block.

Installation

15. Remove the primary ch ain tensioner blade.
1. Remove the pivot bolt which secures the tensioner blade.
2. Remove the tensioner blade.
16. Disconnect the primary chain from the VVT unit and the
crankshaft sprocket, and remove it completely.
17. Do not tamper with the three bolts which secure the VVT
mechanism to the sprockets. It is sealed at the factory to the
correct valve timing specificatio n for the engine and is supplied
only as a complete unit.

18. Remove the VVT unit.
1. Remove the securing bolt from both the VVT unit and
the exhaust cam sprocket.
2. Remove the VVT unit, exhaust sprocket and secondary chain as an asse mbly (release the chain
from the tensioner which is still secured to the
cylinder head).
Remove the secondary chain from the VVT unit and the
sprocket.
19. Clean and inspect all relevant components.

1. Push the tensioner piston (secon dary chain) into the body to
provide clearance for fitting.
1. Insert a thin rigid wire th rough the hole in the end of
the tensioner piston to displace the ball from the non-
return valve seat.
2. With the wire in position, press the piston fully into the tensioner body.
Remove the wire.
2. Fit the VVT unit to the engine.
Assemble the VVT unit, the exhaust camshaft sprocket
and the secondary chain, in pr eparation for fitting to the
engine.
1. Fit the above assembly to the camshafts with the chain correctly positioned over the tensioner; VVT
unit to the inlet and the sprocket to the exhaust.
2. Fit, but do not tighten, each bolt which secures the VVT unit and the exhaust sprocket to the camshafts.

ENSURE THAT ALL FIRE PREVENTION PROCEDURES ARE ACTIVE.
BEFORE PROCEEDING, IT IS ESSENTIAL THAT THE WARNING NOTES GIVEN IN SECTION 100-00 (UNDER THE
HEADING 'SAFETY PRECAUTIONS') ARE READ AND UNDERSTOOD.

9. Depressurise the fuel system.
Ensure that the ignition is switched off and remove the
valve cap from the fuel cross-over pipe. Place a cloth
under the valve to collect any spillage.
Place a closed container, su itable for collecting fuel,
adjacent to the vehicle. Remove the lid.

10. Connect the fuel injection pressure test equipment 310 - 058
(or other suitable type). Insert the drain / bleed tube into the
fuel container. Follow the ma nufacturer's instructions and
depressurise the fuel system.
11. Store the drained fuel safely and ensure that the lid is closed
securely. Remove the equipmen t and discard the cloth from
beneath the valve. Refit the valve cap.

12. Disconnect the breather pipe from the A-Bank camshaft
cover.
1. Disconnect the breather pipe from the stub pipe.
2. Remove and discard the O-ring seal from the breather
pipe.
13. Disconnect the air flow meter multi-plug.
14. Cut and remove the strap which secures the vacuum pipe to
the induction elbow.
15. Disconnect the intake tube from the throttle body.
1. Remove the two bolts which secure the intake tube to the throttle body.
2. Disconnect the intake tube from the throttle body.