1998 JAGUAR X308 chain

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.

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

29
.
Remove the 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
.
Remove residual coolant from the cylinder head.
1. Place a drain tray under the engine.
2. Use a syringe with a length of thin rubber pipe connected, to drain the residual coolant from the outlet pipe water-way.
A s
uitable syringe is Snap On YA 745.
33. Remove the cylinder head.
1. Place cloth around the area of th e cylinder head to absorb coolant
spillage, when removing the head.
2. Remove the bolts (10xM10 and 2xM8) which secure the cylinder

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.

17
.
Install the camshafts.
1. Install the camshafts to position in the cylinder head, with the timing flats uppermost.
2. Install 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.
18. Install the camshaft locking tool 303 - 530, align the camshafts as
necessary.

19
.
Install the chain guide.
• NOTE: The chain guide must be installed so that the slotted hole is
towards the top, and the raised 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.

20
.
Push 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.
Re
move the wire.

21
.
Install 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.
22. Install the VVT unit to the engine.
A
ssemble the VVT unit, the exhaust camshaft sprocket and the

se
condary chain, in preparation for installing 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.

23 .
Install the chain t
ensioning tool 303 - 532 to the exhaust camshaft
sprocket.
Re p
osition the sprocket (and the VVT unit) for the most advantageous
position for use of the tool.
Re
move the tool.

24 . Install the
primary timing chain.
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.

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

26 . P
ush 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.
Rem
ove the wire.
27. Assemble the tensioner.
1. Install the two mounting bolts to the tensioner.
2. Locate the tensioner back-plate to the two bolts.

28
.
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.

29
.
Use 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.

30
.
CAUTION: Make sure that a new bolt is installed.
Tighten the exhaust camshaft sprocket securing bolt. 1. Instal the chain tensioner t ool 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 sprocket securing bolt to 20 Nm + 90°.

31
.
CAUTION: 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 20 Nm + 90°.
R
emove the chain tensioning tool and the wedge(s).
32

.
Remove the camshaft locking tool 303 - 530.
33. Raise the vehicle on the ramp.
34. Remove the crankshaft setting tool 303 - 531.
35. Install the crankshaft position sensor.
1. Install the sensor to the flywheel housing and Install the securing bolt. Tighten to 10 Nm.

Engine - Exhaust Camshaft Sprocket LH4.0L NA V8 - AJ27
In-vehicle Repair
Removal
Special Tool(s)

Camshaft setting
303-530

Crankshaft setting
303-531

Timing chain tensioning
303-532
1. Open the engine compartment and fit paintwork protection
sheets.

2. Disconnect the batt ery ground cable.
Remove the battery cover.
3. Remove the Cam Cover from Ba nk 2. Refer to Operation
12.29.43.
4. Raise the vehicle on a ramp.

5. Remove the crankshaft position sensor.
1. Remove the bolt which secures the crankshaft position sensor to the flywheel housing.
Remove the sensor and allow it to hang free under the
engine.
2. Remove the access grommet (for torque converter bolts) from the housing.

Installation


12. Remove the bolt which secures the sprocket to the exhaust
camshaft.
Move the sprocket forward from the camshaft boss.
Remove the sprocket and leav e the chain resting on the
cylinder head.
13. Clean and inspect all relevant components.

1. Push the tensioner piston into the body to provide clearance
for installing. Tensioner fitted to cylinder head.
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. 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.
3. Install the cams haft sprocket.
Apply force to the tool (303-532) in an anti-clockwise
direction to tension the chain on its drive side.
Whilst applying the opposing force to the sprocket and
chain, tighten the sprocket securing bolt to 115-125 Nm.
Remove the chain tensioning tool.

Engine - Exhaust Camshaft Sprocket LH4.0L SC V8 - AJ26/3.2L NA V8 -
AJ26
In-vehicle Repair
Removal
Special Tool(s)

Camshaft setting
303-530

Crankshaft setting
303-531

Timing chain tensioning
303-532
1. Open the engine compartment and fit paintwork protection
sheets.

2. Disconnect the batt ery ground cable.
Remove the battery cover.
3. Remove the Cam Cover from Ba nk 2. Refer to Operation
12.29.43.
4. Raise the vehicle on a ramp.
5. Remove the crankshaft position sensor.
1. Remove the bolt which secures the crankshaft position sensor to the flywheel housing.
Remove the sensor and allow it to hang free under the
engine.
2. Remove the access grommet (for torque converter bolts) from the housing.