1994 JAGUAR XJ cam timing

AJ16 Engine Service Manual
4.4 Cylinder Head Gasket, Renew
SRO 12.29.01
Drain the cooling system, see Section 4.1 and depressurize
the fuel system,see Section 5.1 (thesesections are in the ap- propriate Vehicle Service Manual). Disconnect the exhaust
system with the vehicle supported on axle stands. Remove
components as required for access to the cylinder head and
proceed as follows.
1 Rotate the engine to TDC No. 1 cylinder.
1 Remove the camshaft cover, see Section 4.2.
1 Push backthe lock tabs and remove the camshaft sprocket
securing bolts (2 Fig. 1). Remove the tab washers (1 Fig. 1).
1 Remove the upper chain tensioner valve clamp bolt (1 Fig. 2), remove the clamp (2 Fig. 2) and remove the
valve (3 Fig. 2).
1 Using a 3 mm Allen key, wind back the tensioner (turn
clockwise) until the snail engages in the park position.
1 Remove the tensioner housing securing bolt (4 Fig. 2) and
withdraw the tensioner assembly.
1 Re-position thetiming chain between the upper dampers.
1 Remove the cylinder head front securing bolts.
1 Remove the remaining cylinder head securing bolts/ nuts.
Remove the upper static damper pedestal assembly and
remove the cylinder head.
0 1 Fit an elastic band to retain the dampers and chain.
. Remove and discard the head gasket.
1 Remove and discard the exhaust manifold sealing rings.
1 Place the cylinder head on suitable blocks on a bench.
Clean the cylinder head thoroughly and check the cylinder
head and cylinder block for warping, bowing or cracks.
Renew if defective.
1 Fit a new cylinder head gasket.
1 Fit the cylinder head assembly to the engine, ensure no
hoses or cables are trapped.
A2616
Fig. 1
Fin. 2
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AJ16 Engine Service Manual
= Refit the upper static damper assembly.
lighten the cylinder head bolts with reference to the se- quence shown in Fig. 1.
CAUTION: The cylinder head bolts MUST be renewed dur- ing assembly and torque tightened as de-
scribed in Section 2.1, SPS Joint Control
System.
Ensure that the camshaft is still on TDC using Ser
-
vice Tool 18G 1433 (1 Fig. 2).
Fit the harness clip and hose bracket to the cylinder head
front securing bolts.
Fit and tighten the front securing bolts.
1433 (1 Fig. 2).
b:
= Check the camshafts are set atTDC using Service Tool 18G
= Raise the timing chain from between the upper dampers.
Remove the elastic band.
= Fit and engage the sprockets to the chain and camshafts.
. Move all the chain free play to the tensioner side.
Fit upper chain tensioner tool 18G 1436/A (2 Fig. 3).
Fit and tighten the tool securing bolts (1 Fig. 3).
Tension the timing chain.
sprocket
(1 1 Fig. 4) and align the securing bolt holes.
bolts
(2 Fig. 4). Lock over the tabs.
Release the tension on the timing chain.
Re
-position the
chain over the camshafts.
. Remove the camshaft coupling (12 Fig. 4) from the
. Fit the tab washers (1 Fig. 4). Fit and tighten the securing
. Slacken off the upper chain tensioner tool securing bolts.
Remove the upper chain tensioner tool 18G 14361A (2 Fig.
Clean the tensioner assembly and gasket faces.
3).
Fit a new housing gasket (10 Fig. 4). Lubricate andfita new '0' ring (9 Fig. 4).
. Fit the tensioner to the cylinder head.
. Fit and tighten the tensioner assembly securing bolt
Clean the valve assembly and fit new '0' rings.
Using an Allen key, release the tensioner, ie turn the Allen
(4 Fig. 3).
Lubricate the tensioner valve.
key
anti-clockwise.
I
104 2 5 7 I l2
I Fig. 1
1
Fig. 2
Fig. 3
Fig. 4
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AJ16 Engine Service Manual
b:
1 Secure with new snap-rings, never re-use old ones.
1 Fit the rings to the pistons ensuring that gaps are posi-
tioned as shown in Fig. 1.
1 Lubricate and compress the rings using Service Tool 18G 55A (Fig. 2).
1 Insert the piston skirt into the bore and using a suitable im- plement such as a wooden hammer shaft, gently tap the
piston into
the cylinder bore.
1 Ensure that the connecting rod does not foul either the cyl-
inder block or camshaft.
Lubricate (using clean engine oil) and fit the bearing shells
to the connecting rod and the connecting rod bearing cap.
Fit the rod to the crankshaft, and fit the connecting rod
bearing cap to the connecting rod.
CAUTION: The connecting rod bearing nuts and bolts
MUST be renewed during assembly and torque
tightened asdescribed in Section2.1, SPS Joint
Control System.
Pistons are marked
'FRONT'. Ensure
that the mark- ing faces the front of the engine.
1 Fit and tighten the connecting rod bearing nuts.
1 Repeat the operation for the remaining pistons.
1 Ensure crankshaft rotation during assembly.
1 Clean and fit the windage trays. Fit and tighten the secur- ing bolts.
1 Removethe oil pumpandoverhau1,seeSection 4.32. Refit
when serviceable.
1 Lubricate the lower timing chain. Fit the chain to the inter- mediate sprocket, fit the chain to the lower sprocket and
then assemble the intermediate sprocket and chain to the
cylinder block.
= Should the intermediate sprocket be worn or damaged,
the assembly must be renewed.
= Fit the spacers to the lower pivoting damper and fit the as-
sembly to the cylinder block.
1 Fit the tab washer and securing bolts.
1 Tighten the bolts and lock over the tabs.
1 Renew the lower tensioner assembly, see Section 4.22.
Fit a dial gauge to the top of the cylinder block and turn the
1 Lubricate the upper chain with clean engine oil and fit to
1 Fit an elastic band around the upper dampers tosecurethe
1 Renew the crankshaft front oil seal, see Section 4.13.
1 Refit the timing cover.
= Lubricate and fit the oil seal distance spacer. Fit and seat
1 Renew the rear housing oil seal, see Section 4.14.
1 Refit the oil pan, see Section 4.27.
1 Refit the cylinder head, see Section 4.4.
1 Remove the engine from the stand.
1 Refit the transmission unit to the engine.
1 Refit the engine/ transmission unit to the vehicle, see Sec-
engine over until No.1 piston is at TDC (Fig. 3).
the intermediate sprocket.
chain.
the crankshaft pulley woodruff key.
tion 3.1 in the appropriate Vehicle Service Manual.
V'
ill'.,
Fia. 1
Fig.
2
Fig. 3
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D
Drive belt tensions, xvi
F
Fau It diagnosis
Diagnostic procedures, 3
Introduction, 3
Foreword, iii
General description
Construction, 1
Cooling system, 2
Crankcase breather, 1
Cylinder head, 1
Lubrication system, 1
Supercharger, 2
S
Service data, xiii
Service materials, xii
Service operations
Check & adjust
Crankshaft end
-float, 27
Valve clearances, 10
Cylinder head, 16
Engine assy., 33
Oil pump, 52
Auxiliary shaft, 44
Auxiliary shaf? rear seal, 45
Camshaft, 7
Camshaft cover gasket, 9
Connecting rod bearings, 22
Crankshaft, 24
Crankshaft damper /pulley assy., 26
Crankshaft front oil seal, 28
Crankshaft rear oil seal, 29
Cylinder head casting, 19
Cylinder head gasket, 13
Drive-plate, 31
Flywheel, 30
Main bearings, 23
Oil filter head gasket, 46
Oil pan gasket, 47
Oil pick-up strainer, 49
Oil pressure relief valve, 50
Oil pump, 51
Oil pump pipe ‘0’ ring, 48
Pistons &connecting rods, 20
Timing chain damper, 40
Timing chain tensioner
Overhaul
Renew
Lower,
42
Upper, 41
Timing chain, gear & tensioner, 37
Timing sprocket, Intermediate, 43
Transmission adapter plate, 32
Service procedures
Sealants, 2
SPS joint control system, 2
Service tools & equipment iv
T
Torque tightening specifications,
53