Infiniti QX4 (R50). Manual — part 423
SEM885EA
SEM886EA
I
Tighten the camshaft brackets in the following steps.
Step
Tightening torque
Tightening order
1
1.96 N·m (0.2 kg-m, 17 in-lb)
Tighten in the order of 7 to 10,
then tighten 1 to 6.
2
5.88 N·m (0.6 kg-m, 52 in-lb)
Tighten in the numerical order.
3
9.02 - 11.8 N·m (0.92 - 1.20 kg-m,
79.9 - 104.2 in-lb)
Tighten in the numerical order.
SEM443G
9.
Install CVTC valves.
SEM534G
10. Install O-rings to cylinder block.
SEM447G
11. Install O-rings to cylinder head.
GI
MA
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
CYLINDER HEAD
Installation (Cont’d)
EM-51
12. Apply sealant to the hatched portion of rear timing chain case.
I
Apply continuous bead of liquid gasket to mating surface of
rear timing chain case.
Refer to “POSITION FOR APPLYING LIQUID GASKET”,
EM-21.
I
Before installation, wipe off the protruding sealant.
SEM448G
13. Align rear timing chain case with dowel pins, then install on
cylinder head and block.
14. Tighten rear chain case bolts.
a.
Tighten bolts in numerical order shown in the figure.
b.
Repeat above step a.
15. Reinstall all removed parts in reverse order of removal.
SEM868E
Valve Clearance
NBEM0022
CHECKING
NBEM0022S01
Check valve clearance while engine is cold and not running.
1.
Remove engine cover.
2.
Remove air duct with air cleaner case, collectors, hoses, wires,
harnesses, connectors and so on.
3.
Remove intake manifold collectors.
4.
Remove ignition coils and spark plugs.
5.
Remove RH and LH rocker covers.
6.
Set No. 1 cylinder at TDC on its compression stroke.
I
Align pointer with TDC mark on crankshaft pulley.
CYLINDER HEAD
Installation (Cont’d)
EM-52
SEM418G
I
Check that valve lifters on No. 1 cylinder are loose and valve
lifters on No. 4 are tight.
If not, turn crankshaft one revolution (360°) and align as above.
SEM893E
7.
Check only those valves shown in the figure.
Crank
position
Valve
No. 1
No. 2
No. 3
No. 4
No. 5
No. 6
INT EXH INT EXH INT EXH INT EXH INT EXH INT EXH
No. 1 TDC
q
q
q
q
SEM139D
I
Using a feeler gauge, measure clearance between valve lifter
and camshaft.
I
Record any valve clearance measurements which are out of
specification. They will be used later to determine the required
replacement adjusting shim.
Valve clearance for checking (Cold):
Intake
0.26 - 0.34 mm (0.010 - 0.013 in)
Exhaust
0.29 - 0.37 mm (0.011 - 0.015 in)
GI
MA
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
CYLINDER HEAD
Valve Clearance (Cont’d)
EM-53
SEM894E
8.
Turn crankshaft 240° and align as above.
9.
Set No. 3 cylinder at TDC on its compression stroke.
10. Check only those valves shown in the figure.
Crank
position
Valve
No. 1
No. 2
No. 3
No. 4
No. 5
No. 6
INT EXH INT EXH INT EXH INT EXH INT EXH INT EXH
No. 3 TDC
q
q
q
q
SEM958E
11. Turn crankshaft 240° and align as above.
12. Set No. 5 cylinder at TDC on its compression stroke.
13. Check only those valves shown in the figure.
Crank
position
Valve
No. 1
No. 2
No. 3
No. 4
No. 5
No. 6
INT EXH INT EXH INT EXH INT EXH INT EXH INT EXH
No. 5 TDC
q
q
q
q
14. If all valve clearances are within specification, install the fol-
lowing parts. If they are out of specification, adjust the valve
clearances.
I
Intake manifold collectors
I
RH and LH rocker covers
I
All spark plugs
I
All ignition coils
SEM449G
ADJUSTING
NBEM0022S02
Adjust valve clearance while engine is cold.
1.
Turn crankshaft, to position cam lobe on camshaft of valve that
must be adjusted upward.
2.
Thoroughly wipe off engine oil around adjusting shim using a
rag.
3.
Using a extra-fine screwdriver, turn the round hole of the
adjusting shim in the direction of the arrow.
CYLINDER HEAD
Valve Clearance (Cont’d)
EM-54
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