1998 JAGUAR X308 camshaft

28
.
Remove the secondary chain tensioner.
1. Remove the two bolts which secure the chain tensioner to the cylinder head.
2. Remove the tensioner.

29
.
Remove the primary chain guide.
1. Remove the bolt which secures the chain guide.
2. Note the orientation of the chain guide and remove it from the upper retaining pin.

30
.
Remove the camshafts.
1. Remove the bolts which secure the camshaft caps; loosen them evenly, in stages.
2. Remove the camshaft caps. Note their orientation and markings -
each is marked with its position (a number) and orientation (an
arrow).
3. Remove the camshafts from the engine.

31
.
Remove the tappets and shims.
1. Note the position of each tappet, for reassembly, and remove each
tappet and shim assembly - retain each shim with its original
tappet.
Mark
the inside face of each tappet in pencil or felt tipped pen, with its
original position within the cylinder head.
32. Disconnect the plug from the engine position sensor, at the rear of the
cylinder head.

15
.
Connect the plug to the engine position sensor, at the rear of the cylinder
head.

16
.
Install the tappet and shim assemblies.
Lu
bricate each tappet assembly.
1. Install each tappet and shim asse mbly to its previously identified
position in the cylinder head.

17
.
Apply oil (EP-90) to the camshaft and bearing surfaces, as follows:
To th
e upper face of each bearing surface (two places) in the cylinder
head.
To th
e upper face of each bearing surface (two places) in each bearing
cap.
On
the cam lobes ONLY, not on the base circle area.
18. Install the camshafts.
1. Install the camshafts to position in the cylinder head, with the timing flats uppermost.

2. In
stall the camshaft caps to their respective locations (inlet 0 to 4
and exhaust 5 to 9 from the front) and in the correct orientation
(arrow to front of engine).
3. Install and tighten the cap securing bolts. Tighten evenly, in stages, to 10 Nm.
19. Install the camshaft locking tool 303 - 530, align the camshafts as
necessary.

20 . Install the chain guide
.
The
c
hain guide must be installed so that the slotted hole is towards
the top, and the rais ed shoulder to the cylinder block.
1. Install the chain guide to the block and locate it onto the upper retaining pin.
2. Install the retaining bolt and tighten it to 12 Nm.

21. P
ush the secondary chain tensioner piston into the body to provide
clearance for installing the chain.
1. Insert a thin rigid wire through 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.
Rem
ove the wire.

22 . Ins
tall the secondary chain tensioner to the engine.
1. Fully seat the tensioner to the cylinder head.
2. Install the two bolts which secure the tensioner and tighten to 12 Nm.

23 . N
OTE: Assemble the VVT unit, the exhaust camshaft sprocket and the
secondary chain, in preparation for installing to the engine.
Install the VVT unit to the engine.
1. Install 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. Install, but do not tighten, each bolt which secures the VVT unit and the exhaust sprocket to the camshafts.
24. Install the chain tensioning tool 303 - 532 to the exhaust camshaft
sprocket.

Re
position the sprocket (and the VVT unit) for the most advantageous
position for use of the tool.
R
emove the tool.

25
.
Install the primary timing chain.
R
eposition the VVT unit forwards on the cam journal (do not rotate it)
to allow the chain to cl ear the head casting. Disconnect the primary
chain from the Ty-strap.
1. Install the primary chain to position over the crankshaft sprocket and the VVT unit sprocket. There mu st be no slack on the drive
side of the primary chain and the VVT unit must not be rotated on
the camshaft.

26
.
Install the primary chain tensioner blade.
1. Position the tensioner blade to the cylinder block.
2. Install the retaining / pivot bolt and tighten it to 14 Nm.

27
.
Push the primary chain tensioner piston into the body to provide clearance
for installing.
1. Insert a thin rigid wire through 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.
Re
move the wire.

28
.
Assemble the tensioner.
1. Install the two mounting bolts to the tensioner.
2. Locate the tensioner back-plate to the two bolts.
29. Install the tensioner to the cylinder block.
1. Position and align the tensioner to the cylinder block and to the mating slot on the rear face of the tensioner blade.
2. Install and tighten the two bolts to 12 Nm.

30. U
se a wedge 303 - 533 (or two if required) between the primary chain
tensioner and tensioner blade, to ta ke up the slack in the chain, for
tightening the VVT unit and exhaust camshaft sprocket.

31 . C
AUTION: Make sure that a new bolt is installed.
Tighten the exhaust camshaft sprocket securing bolt. 1. Install the chain tensioner tool 303 - 532 to the sprocket holes.
Apply
force to the tool in an anti
-clockwise direction to tension the
chain on its drive side.
2. Whilst applying the opposing force to the sprocket and chain, tighten the sprocket securing bolt to 20 Nm +90°.

32 . C
AUTION: Make sure that a new bolt is installed.
Tighten the VVT unit securing bolt. 1. Whilst still applying the opposing force to the sprocket and chain (using 303 - 532), check that the wedges are still in place, tighten
the VVT unit securing bolt to 20Nm +90°.
Re
move the chain tensioning tool and the wedge(s).
33
. R
emove the camshaft locking tool 303 - 530.
34. Raise the vehicle on the ramp.
35. Remove the crankshaft setting tool 303 - 531.

36 . In
stall the crankshaft position sensor.
1. Install the sensor to the flywheel housing and install the securing bolt. Tighten to 10 Nm.
2. Install the access grommet to the housing.
37. Lower the ramp.
38. Install and tighten the nuts which secure the exhaust manifold to the

E
ngine - Cylinder Head RH
In-ve
hicle Repair
Remova

l
CAU
TION: If a replacement cylinder head is to be installed to a
vehicle with variable camshaft timing (VCT) the cylinder head m ust have the
oil gallery blind rivet removed before installation.
Spe
cial Tool(s)

Cams

haft setting
303-530

Ti
ming chain tensioning
303-532

Wedges, prim
ary chain
303-533

Cr
ankshaft setting
303-531
1.
Open the engine compartment and install paintwork protection sheets.
2. Set the engine compartment cover to the service access position.

3.
Disconnect the battery ground cable.
Re

move the battery cover.
4. Remove the engine front cover.For additional information, refer to: Engine
Front Cover (303-01 Engi
ne, In-vehicle Repair).
5. Remove the Inlet Manifold. Refer to Operation 30.15.01 in this Section. This operation includes depressurising the fuel system and removing the throttle
housing.
6. Disconnect the hoses and multi-plug from the coolant outlet pipe.
1. Release and reposition the hose clip, and disconnect the heater hose.
2. Disconnect the multi-plug from the temperature sensor.
3. Release and reposition the hose clip along the bypass hose.

• N
OTE: Remove the sensor and allow it to hang free under the engine.

1

. Remove the bolt which secures the crankshaft position sensor to
the flywheel housing.
2. Remove the access grommet (for torque converter bolts) from the housing.
14. Install the damper securing bolt (old one) to the crankshaft, hand-tight
only.

15
.
Rotate the crankshaft until the triangular arrow indent on the drive plate is
visible through the access hole; confirm that the timing flat on each
camshaft is uppermost.

16
.
Install the crankshaft setting peg 3 03 - 531 to the crankshaft position
sensor location.
1. Install the crankshaft setting peg 303 - 531.
Position
the crankshaft so that the setting peg engages fully into the
timing slot.
2. Install and tighten the bolt to secure the setting peg.
17. Remove the damper securing bolt from the crankshaft.
18. Lower the vehicle on the ramp.

19
.
Install the camshaft locking tool 303 - 530 to the A-Bank camshafts,
aligning the shafts slightly as necessary.

20
.
Loosen the bolt which secures the sprocket to the camshaft.

21. L
oosen the bolt which secures the VVT unit to the camshaft.
22. Remove the camshaft locking tool 303 - 530 (installed for previous
operation).

23. R
emove the primary chain tensioner bolts.

24 . R
emove the tensioner assembly.
1. Remove the tensioner.
2. Remove the tens ioner back-plate.

25 . R
emove the primary chain tensioner blade.
1. Remove the pivot bolt which secures the tensioner blade.
2. Remove the tensioner blade.
26. Remove the primary chain from the VVT unit and from the crankshaft
pulley.

27 . R
emove the VVT unit and exhaust camshaft sprocket.
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 assembly (release the chain from the tensioner which is still
secured to the cylinder head).
Re
move the secondary chain from
the VVT unit and the sprocket.
28. Remove the secondary chain tensioner.