timing chain installation INFINITI QX4 2001 Factory User Guide

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

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

CAUTION:
IWhen installing camshafts, chain tensioners, oil seals, or
other sliding parts, lubricate contacting surfaces with new
engine oil.
IApply new engine oil to threads and seat surfaces when
installing cylinder head, camshaft sprocket, crankshaft
pulley, and camshaft bracket.
IAttach tags to valve lifters so as not to mix them up.
RemovalNBEM00171. Remove engine from vehicle. Refer to EM-57, ªRemoval and
Installationº.
2. Remove exhaust manifolds in reverse order of installation.
Refer to EM-13, ªExhaust Manifoldº.
3. Place engine on a work stand.
4. Remove aluminum oil pan. Refer to EM-15, ªRemovalº.
5. Remove timing chain. Refer to EM-23, ªRemovalº.
SEM964F
6. Remove intake manifold in reverse order of installation. Refer
to ªTIGHTENING PROCEDURESº, EM-12.
7. Remove water outlet.
SEM442G
8. Remove rear timing chain case bolts.
ILoosen in numerical order as shown in the figure.
SEM168FA
9. Remove rear timing chain case.
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CYLINDER HEAD
Components (Cont'd)
EM-39

SEM867E
Lifter guide bore diameter:
35.000 - 35.021 mm (1.3780 - 1.3788 in)
SEM085D
AssemblyNBEM00201. Install valve component parts.
IAlways use new valve oil seal. Refer to ªVALVE OIL
SEALº, EM-35.
IBefore installing valve oil seal, install valve spring seat.
IInstall valve spring (uneven pitch type) with its narrow
pitch side toward cylinder head side (paint mark).
IAfter installing valve component parts, tap valve stem tip with
plastic hammer to assure a proper fit.
SEM891E
InstallationNBEM00211. Before installing rear timing chain case, remove old liquid gas-
ket from mating surface using a scraper.
IAlso remove old liquid gasket from mating surface of cylinder
block.
SEM161F
IRemove old liquid gasket from the bolt hole and thread.
SEM892E
2. Before installing cam bracket, remove old liquid gasket from
mating surface using a scraper.
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CYLINDER HEAD
Inspection (Cont'd)
EM-47

12. Apply sealant to the hatched portion of rear timing chain case.
IApply continuous bead of liquid gasket to mating surface of
rear timing chain case.
Refer to ªPOSITION FOR APPLYING LIQUID GASKETº,
EM-21.
IBefore 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 ClearanceNBEM0022CHECKINGNBEM0022S01Check 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.
IAlign pointer with TDC mark on crankshaft pulley.
CYLINDER HEAD
Installation (Cont'd)
EM-52