1998 JAGUAR X308 VVT

1.
Fit the crankshaft setting peg 303 - 531.
Position the crankshaft so
that the setting
peg engages
fully into the timing slot.
2. Fit and tighten the bolt to secure the setting peg.
12. Remove the damper securing bolt from the crankshaft.
13. Lower the vehicle on the ramp.

14. F
it the camshaft locking tool 303 - 530 to the A-Bank
camshafts, aligning the shafts slightly as necessary.

15. L
oosen the bolt which secures
the sprocket to the camshaft.

16. Loosen
the bolt which secure
s VVT unit to the camshaft.
17. Remove the primary ch ain tensioner bolts.

I
nstallation


18
.
Remove the tensioner assembly.
1. Remove the tensioner.
2. Remove the tensioner back-plate.

19
.
Remove the chain tensioner blade.
1. Remove the pivot bolt which secures the tensioner blade.
2. Remove the tensioner blade.
20. Remove the chain from the VVT unit and from the crankshaft
sprocket.

21
.
If necessary, remove the sp rocket from the crankshaft.
No
te the orientation of the
sprocket relative to the
sprocket for the B-Bank drive (half a tooth out of line) and
remove the sprocket.
22. Clean and inspect all relevant components.
1. If removed previously, fit the sprocket to the crankshaft.

The
teeth of the A-Bank and the B-Bank sprockets on the
crankshaft must be out of phas e with each other. If they
are in-phase after fitting, remo ve the sprocket, turn it on
its vertical axis and refit it.

2. Fi
t the chain tensioning tool 303 - 532 to the exhaust camshaft
sprocket.
Re po
sition the sprocket (and
the VVT unit) for the most
advantageous position for use of the tool.
R e
move the tool.

3. Re
fit the primary timing chain.
1. Fit the primary chain to position over the crankshaft sprocket and the VVT unit sprocket. There must be no
slack on the drive side of the primary chain and the
VVT unit must not be rotated on the camshaft.

4. Fit the primary chain tensioner
blade.
1. Position the tensioner blade to the cylinder block.
2. Fit the retaining / pivot bolt and tighten it to 12-16 Nm.
5. Refit the primary chain tensione r assembly. Refer to Operation
12.65.54 in this Section.
U s
e a wedge 303 - 533 (or two if required) between the
primary chain tensioner and te nsioner blade, to take up
the slack in the chain.

6. Tigh
ten the exhaust camshaft
sprocket securing bolt.
1. Fit the chain tensioner tool 303 - 532 to the sprocket holes.
Appl
y 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 sprock et securing bolt to 115 -
125 Nm.

7. Tigh
ten 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 115 - 125 Nm.
R
emove the chain tensioning
tool and the wedge(s).
8. Remove the camshaft locking tool 303 - 530.
9. Raise the vehicle on the ramp.
10. Remove the crankshaft setting tool 303 - 531.

11
.
Refit the crankshaft position sensor.
1. Fit the sensor to the fl ywheel housing and fit the
securing bolt. Tighten to 8-12 Nm.
2. Refit the access grommet to the housing.
12. Lower the ramp.
13. Fit new seals to the VVT bush carrier.
1. Fit the new sealing ring (scarf jointed) to the carrier bush groove.

2.
Fit a new O-ring to the carrier oil-way.

14. F
it the VVT bush carrier to the cylinder block.
Lubric

ate the seal (scarf
jointed) and the bush.
1. Fit the bush carrier assembly.
Check that th e seals are in pl ace an
d that the ring dowels
are engaged squarely. Fully locate the assembly as much
as possible by hand pressure.
2. Fit the three securing bolts. Tighten to 19-23 Nm.
15. Refit the Timing Cover. Refer to Operation 12.65.01 in this
Section.
16. Move the engine compartment cover from the service position
and connect the gas struts.
17. Remove the paint protection sheets and close the cover.
18. Connect the battery and fit the battery cover.
Refe
r to the Battery Reconnection Procedure in Section
414-01.

7.
Remove the coolant outlet pipe.
1. Remove the four bolts which secure the outlet pipe.
2. Remove the outlet pipe from the bypass hose and from the cylinder heads.
8. Remove and discard the sealing ring s from the outlet pipe grooves.

9.
Remove the nuts which secure the catalytic converter to the B-Bank
exhaust manifold flange.

10 . Re
move the VVT bush carrier.
1. Remove the two bolts and one nut which secure the carrier to the cylinder block.
2. Release the carrier from the two ring dowels and remove it.

11. R
emove the seals from the bush carrier.
1. Remove the sealing ring (scarf jointed) from the carrier bush groove.
2. Remove the O-ring from the carrier oil-way recess.
12. Raise the vehicle on a ramp.
13. Remove the crankshaft position sensor.

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. Reposition the VVT unit along the cam journal to allow the chain to clear
the head casting.
Di s
connect the primary chain from the VVT unit and secure it to the
bypass hose retaining clip, using a Ty-strap.
27. Remove 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.

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.