timing chain INFINITI QX4 2001 Factory User Guide

ComponentsNBEM0011
JEM410G
1. Rear timing chain case
2. Left camshaft chain tensioner
3. Internal guide
4. Timing chain (Secondary)
5. Right camshaft chain tensioner
6. Timing chain tensioner
7. Slack guide
8. Timing chain (Primary)9. Crankshaft sprocket
10. Lower tension guide
11. Upper tension guide
12. Front timing chain case
13. Crankshaft pulley
14. Water pump cover
15. Chain tensioner cover
16. Exhaust camshaft sprocket17. CVTC cover
18. Intake camshaft sprocket
19. PHASE sensor
20. CVTC sensor
21. Variable induction air control valve
control solenoid valve
22. Swirl control valve control solenoid
valve
TIMING CHAIN
Components
EM-20

POSITION FOR APPLYING LIQUID GASKET=NBEM0011S01Refer to ªInstallationº in ªOIL PANº, EM-18.
IBefore installation, wipe off the protruding sealant.
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TIMING CHAIN
Components (Cont'd)
EM-21

SEM411G
TIMING CHAIN
Components (Cont'd)
EM-22

CAUTION:
IAfter removing timing chain, do not turn crankshaft and
camshaft separately, or valves will strike piston heads.
IWhen installing camshafts, chain tensioners, oil seals, or
other sliding parts, lubricate contacting surfaces with new
engine oil.
IApply new engine oil to bolt threads and seat surfaces
when installing camshaft sprockets and crankshaft pulley.
IBefore disconnecting fuel hose, release fuel pressure.
Refer to EC-39, ªFuel Pressure Releaseº.
IBe careful not to damage sensor edges.
IDo not spill engine coolant on drive belts.
RemovalNBEM00121. Release fuel pressure.
Refer to EC-39, ªFuel Pressure Releaseº.
2. Remove battery.
3. Remove radiator.
Refer to LC-19, ªREMOVAL AND INSTALLATIONº.
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.
IVacuum gallery
IWater bypass pipe
IBrackets
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TIMING CHAIN
Components (Cont'd)
EM-23

SEM421G
SEM422G
13. Remove camshaft position sensor (PHASE), CVTC sensors
and crankshaft position sensor (REF).
IAvoid impact such as dropping.
IDo not disassemble the components.
IDo not place them on areas where iron powder may adhere.
IKeep away from the objects susceptible to magnetism.
SEM412G
14. Remove upper intake manifold collector in reverse order of
installation. Refer to EM-12, ªUpper Intake Manifold Collectorº.
SEM413G
15. Remove intake manifold collector support bolts.
SEM414G
16. Remove lower intake manifold collector in reverse order of
installation. Refer to EM-13, ªLower Intake Manifold Collectorº.
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, ªFuel Tubeº.
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.
IAlign pointer with TDC mark on crankshaft pulley.
SEM418G
ICheck that intake and exhaust cam nose on No. 1 cylinder are
installed as shown left.
If not, turn the crankshaft one revolution (360É) and align as
above.
SEM485G
22. Remove starter motor, and set ring gear stopper using the
mounting bolt hole.
IBe careful not to damage the signal plate teeth.
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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, ªRemovalº.
26. Temporarily install the suspension member bolts and engine
mounting nuts.
SEM423G
27. Remove CVTC covers.
ILoosen bolts in numerical order as shown in the figure.
IIn 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.
ILoosen bolts in numerical order as shown in the figure.
SEM156F
29. Remove front timing chain case.
IDo not scratch sealing surfaces.
TIMING CHAIN
Removal (Cont'd)
EM-26

SEM919EA
30. Remove internal chain guide.
31. Remove upper tension guide.
32. Remove timing chain tensioner and slack guide.
SEM966F
IRemove timing chain tensioner. (Push piston and insert a suit-
able pin into pinhole.)
SEM425G
33. Attach a suitable stopper pin to RH and LH camshaft chain
tensioners.
SEM426G
34. Remove intake and exhaust camshaft sprocket bolts.
IApply paint to timing chain and camshaft sprockets for
alignment during installation.
ISecure the hexagonal head of the camshaft using a span-
ner to loosen mounting bolts.
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TIMING CHAIN
Removal (Cont'd)
EM-27

SEM427G
35. Remove primary and secondary timing chains along with the
camshaft sprockets.
IDo not disassemble the intake camshaft sprocket.
IAvoid damaging the signal mark protrusion area at the front of
the left bank intake camshaft sprocket. Keep it away from
magnetized objects.
SEM924E
36. Remove lower chain guide.
37. Remove crankshaft sprocket.
SEM428G
38. Use a scraper to remove all traces of liquid gasket from front
timing chain case.
SEM161F
IRemove old liquid gasket from the bolt hole and thread.
SEM429G
39. Use a scraper to remove all traces of liquid gasket from CVTC
cover.
TIMING CHAIN
Removal (Cont'd)
EM-28

SEM928E
InspectionNBEM0013Check for cracks and excessive wear at roller links. Replace
chain if necessary.
SEM930E
InstallationNBEM00141. Position crankshaft so that No. 1 piston is set at TDC on com-
pression stroke.
SEM929E
2. Install crankshaft sprocket on crankshaft.
IMake sure that mating marks on crankshaft sprocket face
front of engine.
SEM931E
3. Install lower chain guide on dowel pin, with front mark on the
guide facing upside.
SEM430G
4. Press and shrink the secondary chain tensioner sleeve, and fix
it using stopper pins.
ILubricate threads and seat surfaces of camshaft sprocket bolts
with new engine oil.
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TIMING CHAIN
Inspection
EM-29