Infiniti QX4 (R50). Manual — part 416
CAUTION:
I
After removing timing chain, do not turn crankshaft and
camshaft separately, or valves will strike piston heads.
I
When installing camshafts, chain tensioners, oil seals, or
other sliding parts, lubricate contacting surfaces with new
engine oil.
I
Apply new engine oil to bolt threads and seat surfaces
when installing camshaft sprockets and crankshaft pulley.
I
Before disconnecting fuel hose, release fuel pressure.
Refer to EC-39, “Fuel Pressure Release”.
I
Be careful not to damage sensor edges.
I
Do not spill engine coolant on drive belts.
Removal
NBEM0012
1.
Release fuel pressure.
Refer to EC-39, “Fuel Pressure Release”.
2.
Remove battery.
3.
Remove radiator.
Refer to LC-19, “REMOVAL AND INSTALLATION”.
4.
Drain engine oil.
5.
Remove drive belts and idler pulley with brackets.
6.
Remove cooling fan with bracket.
7.
Remove engine cover.
8.
Remove air duct with air cleaner case, collector, blow-by hose,
vacuum hoses, fuel hoses, water hoses, wires, harnesses,
connectors and so on.
9.
Remove the air compressor, and tie it down using rope or the
like to keep it from interfering.
10. Remove the power steering oil pump and reservoir tank. Tie
them down using rope or the like to keep them from interfer-
ing.
11. Remove alternator.
12. Remove the following.
I
Vacuum gallery
I
Water bypass pipe
I
Brackets
GI
MA
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TIMING CHAIN
Components (Cont’d)
EM-23
SEM421G
SEM422G
13. Remove camshaft position sensor (PHASE), CVTC sensors
and crankshaft position sensor (REF).
I
Avoid impact such as dropping.
I
Do not disassemble the components.
I
Do not place them on areas where iron powder may adhere.
I
Keep away from the objects susceptible to magnetism.
SEM412G
14. Remove upper intake manifold collector in reverse order of
installation. Refer to EM-12, “Upper Intake Manifold Collector”.
SEM413G
15. Remove intake manifold collector support bolts.
SEM414G
16. Remove lower intake manifold collector in reverse order of
installation. Refer to EM-13, “Lower Intake Manifold Collector”.
TIMING CHAIN
Removal (Cont’d)
EM-24
SEM415G
17. Disconnect injector harness connectors.
18. Remove fuel tube assembly in reverse order of installation.
Refer to EM-12, “Fuel Tube”.
SEM416G
19. Remove ignition coils.
20. Remove RH and LH rocker covers from cylinder head.
SEM417G
21. Set No. 1 piston at TDC on the compression stroke by rotat-
ing crankshaft.
I
Align pointer with TDC mark on crankshaft pulley.
SEM418G
I
Check that intake and exhaust cam nose on No. 1 cylinder are
installed as shown left.
If not, turn the crankshaft one revolution (360°) and align as
above.
SEM485G
22. Remove starter motor, and set ring gear stopper using the
mounting bolt hole.
I
Be careful not to damage the signal plate teeth.
GI
MA
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TIMING CHAIN
Removal (Cont’d)
EM-25
SEM419G
23. Loosen the crankshaft pulley bolt.
SEM420G
24. Remove crankshaft pulley with a suitable puller.
25. Remove aluminum oil pan.
Refer to EM-15, “Removal”.
26. Temporarily install the suspension member bolts and engine
mounting nuts.
SEM423G
27. Remove CVTC covers.
I
Loosen bolts in numerical order as shown in the figure.
I
In the cover, the shaft is engaged with the center hole of the
intake cam sprocket. Remove it straight out until the engage-
ment comes off.
SEM424G
28. Remove front timing chain case bolts.
I
Loosen bolts in numerical order as shown in the figure.
SEM156F
29. Remove front timing chain case.
I
Do not scratch sealing surfaces.
TIMING CHAIN
Removal (Cont’d)
EM-26
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