INFINITI QX4 2001 Factory Service Manual

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

SEM431G
5. Install secondary timing chain and sprocket to one of the banks
(Right bank shown in the figure) as described below.
a. Align mating marks (golden links) on secondary timing chain
with those (punched marks) on the intake and exhaust sprock-
ets.
b. Align camshaft knock pins with the sprocket groove and hole.
IBecause camshaft sprocket mounting bolts are tightened in
step 7, perform manual tightening to the extent necessary to
keep camshaft knock pin from dislocating.
SEM432G
IMatching marks of the intake sprocket are on the back side of
the secondary sprockets. There are two types of the marks;
round and oval types, which should be used for right and left
banks respectively.
Right bank: Round
Left bank: Oval
SEM433G
IIt may be difficult to visually check the dislocation of mating
marks during and after installation. To make the matching
easier, make a mating mark on the sprocket teeth in advance
using paint.
SEM434G
6. Install secondary timing chain and sprocket to the other bank.
Install primary timing chain at the same time.
IInstallation of the secondary timing chain follows the procedure
described in step 5.
IInstall primary timing chain so that mating mark (punched) on
camshaft sprocket is aligned with that (yellow link) on the tim-
ing chain, and mating mark (notched) on crankshaft sprocket
is aligned with that on the timing chain, respectively.
IWhen it is difficult to align mating marks of the primary timing
chain with each sprocket, gradually turn the camshaft hexago-
nal head using a spanner so it is aligned with the mating mark.
IDuring alignment, be careful to prevent dislocation of mating
marks on the secondary timing chain.
TIMING CHAIN
Installation (Cont'd)
EM-30

SEM426G
7. After confirming the mating marks are aligned, tighten the cam-
shaft sprocket mounting bolts.
ISecure the camshaft hexagonal head using a spanner to
tighten mounting bolts.
SEM425G
8. Pull out the stopper pin from the secondary timing chain ten-
sioner.
SEM919EA
9. Install internal guide.
10. Install upper tension guide and slack guide.
SEM967F
11. Install timing chain tensioner, then remove the stopper pin.
IWhen installing the timing chain tensioner, engine oil
should be applied to the oil hole and tensioner.
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TIMING CHAIN
Installation (Cont'd)
EM-31

SEM435G
12. Install O-rings on rear timing chain case.
13. Apply liquid gasket to front timing chain case.
IRefer to ªPOSITION FOR APPLYING LIQUID GASKETº,
EM-21.
IBefore installation, wipe off the protruding sealant.
SEM436G
14. Install rear case pin into dowel pin hole on front timing chain
case.
15. Tighten bolts to the specified torque in order shown in the fig-
ure.
ILeave the bolts unattended for 30 minutes or more after
tightening.
SEM437G
16. Install CVTC cover.
a. Install O-rings at front timing chain case.
b. Install seal ring at CVTC covers.
c. Apply liquid gasket to CVTC covers.
Use genuine RTV silicone sealant Part No. 999MP-A7007 or
equivalent.
IBeing careful not to move the seal ring from the installation
groove, align the dowel pins on the chain case with the holes
to install the CVTC cover.
SEM438G
ITighten in numerical order as shown in the figure.
TIMING CHAIN
Installation (Cont'd)
EM-32

SEM439G
SEM440G
17. Install RH and LH rocker covers.
Rocker cover tightening procedure:
ITighten in numerical order as shown in the figure.
a. Tighten bolts 1 to 10 in that order to 6.9 to 8.8 N´m (0.7 to 0.9
kg-m, 61 to 78 in-lb).
b. Then tighten bolts 1 to 10 as indicated in figure to 6.9 to 8.8
N´m (0.7 to 0.9 kg-m, 61 to 78 in-lb).
18. Hang engine using the right and left side engine slingers with
a suitable hoist.
19. Set a suitable transmission jack under the suspension mem-
ber.
20. Remove right and left side engine mounting nuts.
21. Remove right and left side suspension member bolts.
22. Install aluminum oil pan. Refer to EM-18, ªInstallationº.
23. Set ring gear stopper using the mounting bolt hole.
IBe careful not to damage the signal plate teeth.
SEM417G
24. Install crankshaft pulley to crankshaft.
IAlign pointer with TDC mark on crankshaft pulley.
SEM531G
25. Install crankshaft pulley bolt.
ILubricate thread and seat surface of the bolt with new
engine oil.
a. Tighten to 39 to 49 N´m (4.0 to 5.0 kg-m, 29 to 36 ft-lb).
b. Put a paint mark on the crankshaft pulley.
SEM963E
c. Again tighten by turning 60É to 66É, about the angle from one
hexagon bolt head corner to another.
26. Install camshaft position sensor (PHASE), crankshaft position
sensors (REF)/(POS) and CVTC sensors.
27. Reinstall removed parts in the reverse order of removal.
IWhen installing fuel tube and intake manifold collectors, refer
to EM-12, ªTIGHTENING PROCEDURESº.
IAfter starting engine, keep idling for three minutes. Then
rev engine up to 3,000 rpm under no load to purge air from
the high-pressure chamber of the chain tensioners. The
engine may produce a rattling noise. This indicates that
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TIMING CHAIN
Installation (Cont'd)
EM-33

air still remains in the chamber and is not a matter of
concern.
TIMING CHAIN
Installation (Cont'd)
EM-34

SEM948E
ReplacementNBEM0015CAUTION:
When removing the oil pans, oil pump assembly and timing
chain from engine, first remove the camshaft position sensor
(PHASE), CVTC sensor and the crankshaft position sensors
(REF)/(POS) from the assembly.
Be careful not to damage sensor edges.
VALVE OIL SEALNBEM0015S011. Remove timing chain. Refer to ªRemoval, EM-23.
2. Remove camshaft brackets and camshaft. Refer to
ªDisassemblyº, EM-41.
3. Remove valve lifters and shims.
4. Remove valve spring with Tool.
5. Reinstall any parts removed in reverse order of removal.
Before removing valve spring, fix valve as follows.
Method A:
Piston concerned should be set at TDC to prevent valve
from falling.
SEM826E
Method B:
Remove spark plug, then install air hose adapter into
spark plug hole and apply air pressure to hold valves in
place. Apply a pressure of 490 kPa (5 kg/cm
2, 71 psi).
SEM983D
Method C:
Install spark plug with suitable washer into spark plug
hole from combustion chamber side.
SEM827E
6. Remove valve oil seal.
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OIL SEAL
Replacement
EM-35

SEM828E
7. Apply engine oil to new valve oil seal and install it with Tool.
SEM715A
OIL SEAL INSTALLATION DIRECTIONNBEM0015S02IInstall new oil seal in the direction shown in the figure.
FRONT OIL SEALNBEM0015S031. Remove the following parts:
IEngine undercover
ISuspension member stay
IDrive belts
ICrankshaft position sensor (REF)
Be careful not to damage sensor edge.
ICrankshaft pulley
IRadiator
ICooling fan
SEM829E
2. Remove front oil seal using a suitable tool.
Be careful not to scratch front cover.
3. Apply engine oil to new oil seal and install it using a suitable
tool.
SEM830E
REAR OIL SEALNBEM0015S041. Remove transmission. Refer to AT-277, ªRemovalº.
2. Remove drive plate.
3. Remove oil pan. Refer to EM-15.
4. Remove rear oil seal retainer.
OIL SEAL
Replacement (Cont'd)
EM-36

SEM831E
5. Remove old liquid gasket using scraper.
IRemove old liquid gasket from the bolt hole and thread.
SEM832EA
6. Apply liquid gasket to rear oil seal retainer.
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OIL SEAL
Replacement (Cont'd)
EM-37