INFINITI QX56 2007 Factory Service Manual

TIMING CHAINEM-41
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Check for cracks and any excessive wear
at link plates. Replace
chain if necessary.
• In the same way as for the LH bank, inspect the timing chain and associated parts on the RH bank.
INSTALLATION
NOTE:
• The above figure shows the relationship between the ma ting mark on each timing chain and that of the cor-
responding sprocket, with the components installed.
• To install the timing chain and associated parts, star t with those on the RH bank. The procedure for installing
parts on the LH bank is omitted because it is t he same as that for installation on the RH bank.
PBIC0282E
AWBIA0150ZZ
1. Camshaft sprocket RH bank INT
(VTC) 2. Camshaft sprocket RH bank EXH 3. Camshaft dowel pin RH bank
4. Timing chain RH bank 5. Timing chain slack guide RH bank 6. Chain tensioner (RH)
7. Crankshaft sprocket 8. Crankshaft key 9. Timing chain tension guide LH bank
10. Timing chain LH bank 11. Camshaft dowel pin LH bank 12. Camshaft sprocket LH bank EXH
13. Camshaft sprocket LH bank INT (VTC) 14. Chain tensioner LH 15. Timing chain tension guide RH bank
16. Timing chain slack guide LH bank A. LH bank B. RH bank
C. Alignment mark (Link color: copper) D . Alignment mark (Link color: copper) E. Alignment ma rk (Identification mark)
F. Alignment mark for LH bank (Notch) G. Alignment mark for LH bank (Link color: Yellow)H. Alignment mark for RH bank (Link
color: Yellow)
J. Alignment mark (Link color: copper) K. Alignment mark (Identification mark) L. Alignment mark (Identification mark)
M Alignment mark (Link color: copper) N. A lignment mark (Identification mark)

EM-42
< SERVICE INFORMATION >
TIMING CHAIN
1. Make sure the crankshaft key and camshaft dowel pin RH bankand camshaft dowel pin LH bank are facing in the direction
shown.
2. Install the camshaft sprockets. • Install the camshaft sprocket INT (VTC) (A) and camshaftsprockets EXH (B) by selectively using the groove of the
dowel pin according to the bank . (Common part used for both
exhaust banks.)
NOTE:
Use the groove marked "R" for RH bank and "L" for LH bank.
• Lock the hexagonal part of the camshaft in the same way as for removal, and tighten the bolts.
3. Install the crankshaft sprockets for both banks. • Install LH bank crankshaft sprocket (B) and RH bank crank-shaft sprocket (C) so that their flange side (A) (the larger diam-
eter side without teeth) faces in the direction shown.
NOTE:
The same parts are used but facing directions are different.
4. Install the timing chains and associated parts. • Align the alignment mark on each sprocket and the timing chain for installation.
CAUTION:
• Before installing timing chain tens ioner, it is possible to change the position of alignment mark
on timing chain and each sprocket. After the al ignment marks are aligned, keep them aligned
by holding them by hand.
• Install the slack guides and tension guides onto the co rrect side by checking the identification mark on
the surface.
• Install the chain tensioner with the plunger locked in with the stopper pin.
CAUTION:
• Before and after the installation of the chain tensioner, make sure that the alignment mark on
the timing chain is not out of alignment.
• After installing the chain tensioner, remove the stopper pin to release the chain tensioner.
Make sure the chain tensioner is released.
• To avoid chain-link skipping of the timing chain, do not move crankshaft or camshafts until the
front cover is installed.
5. In the same way as for the RH bank, install the timing chain and associated parts on the LH bank.
6. Install the oil pump.
SBIA0356E
AWBIA0151ZZ
WBIA0701E

TIMING CHAINEM-43
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7. Install the oil pump drive spacer as follows:
• Install so that the front mark on the front edge of the oil pump
drive spacer faces the front of the engine.
• Insert the oil pump drive spacer according to the directions of
the crankshaft key and the two flat surfaces of the oil pump
inner rotor.
• If the positional relationship does not allow the insertion, rotate the oil pump inner rotor to allow the oil pump drive spacer to
be inserted.
8. Install the front oil seal using suitable tool. CAUTION:
Do not scratch or make burrs on the circumference of the
oil seal.
9. Install the chain tensioner cover. • Apply liquid gasket as shown.
Use Genuine RTV Silicone Seal ant or equivalent. Refer to
GI-45, "
Recommended Chemical Product and Sealant".
10. Install the front cover as follows:
a. Install a new O-ring on the cylinder block.
KBIA2490E
PBIC0059E
KBIA2547E
KBIA2516E

EM-44
< SERVICE INFORMATION >
TIMING CHAIN
b. Apply liquid gasket as shown.Use Genuine RTV Silicone Seal ant or equivalent. Refer to
GI-45, "
Recommended Chemical Product and Sealant".
c. Check again that the timing alignment marks on the timing chain and on each sprocket are aligned. Then install the front cover.
d. Install the bolts in the numerical order shown.
e. After tightening, re-tighten to the specified torque. CAUTION:
Be sure to wipe off any excessive liquid gasket leaking onto
surface mating with oil pan.
11. Install the timing chain case cover RH bank (A) and timing chain case cover LH bank (B) as follows:
• *: Cross mark (c) that can not be seen after assembly
a. Apply liquid gasket (a) as shown. Use Genuine RTV Silicone Seal ant or equivalent. Refer to
GI-45, "
Recommended Chemical Product and Sealant".
CAUTION:
The start and end of the appl ication of the liquid gasket
should be crossed at a position that cannot be seen after
attaching the chain case cover.
b. Install the bolts in the numerical order shown.
12. Install the crankshaft pulley. • Install the key of the crankshaft.
• Insert the pulley by lightly tapping it.
CAUTION:
Do not tap pulley on the side surface where th e belt is installed (outer circumference).
13. Tighten the crankshaft pulley bolt. • Lock the crankshaft using suitable tool, then tighten the bolt.
• Perform the following steps for angular tightening:
a. Apply engine oil onto the threaded parts of the bolt and seating area.
KBIA2517E
M6 × 50 mm (1.97 in) : No. 1, 20, 25, 26, 27
M6 × 80 mm (3.15 in) : No. 4, 5, 7
M6 × 20 mm (0.79 in) : Except the above
KBIA2478E
D : 2.6 - 3.6 mm (0.102 - 0.142 in) dia.
WBIA0800E
WBIA0798E

TIMING CHAINEM-45
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b. Select the one most visible notch of the four on the bolt flange.
Corresponding to the selected notch, put a alignment mark
(such as paint) on the crankshaft pulley.
14. Rotate the crankshaft pulley in normal direction (clockwise when viewed from engine front) to check for parts interference.
15. Installation of the remaining components is in the reverse of order of removal.Crankshaft pulley bolt torque
Step 1 : 93.1 N·m (9.5 kg-m, 69 ft-lb)
Step 2 : additional 90
° (angle tightening)
KBIA2519E

EM-46
< SERVICE INFORMATION >
CAMSHAFT
CAMSHAFT
Removal and InstallationINFOID:0000000003531534
NOTE:
Do not remove the engine assembly to perform this procedure.
REMOVAL
1. Remove the RH bank and LH bank rocker covers. Refer to EM-35, "Removal and Installation".
2. Obtain compression TDC of No. 1 cylinder as follows:
a. Turn the crankshaft pulley clockwise to align the TDC identifica- tion notch (without paint mark) with the timing indicator on the
front cover.
1. Cylinder head RH bank 2. Camshaft bracket (No. 2, 3, 4, 5) 3. Valve lifter
4. Camshaft bracket (No. 1) 5. Seal washer 6. Camshaft RH bank EXH
7. Camshaft RH bank INT 8. Camshaft LH bank INT 9. Camshaft LH bank EXH
10. Camshaft sprocket RH bank EXH 11. Camshaft sprocket RH bank INT 12. Camshaft sprocket LH bank INT
13. Camshaft sprocket LH bank EXH 14. Camshaft position sensor (PHASE) 15. O-ring
16. Cylinder head LH bank A. Follow installation procedure
WBIA0801E
KBIA2476E

CAMSHAFTEM-47
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b. At this time, make sure both intake and exhaust cam lobes of
No. 1 cylinder (top front on LH bank) point outside.
• If they do not point outside, turn crankshaft pulley once more.
3. Remove the chain case cover RH bank (A) and chain case cover LH bank (B) as follows:
a. Loosen and remove the bolts as shown.
b. Cut the liquid gasket and remove the covers using Tool.
CAUTION:
Do not damage mating surfaces.
4. Paint alignment marks on the RH bank (A) timing chain links (C) LH (B) timing chain links (D) and aligning with the camshaft
sprocket alignment marks (E) and (F).
5. Remove the chain tensioner (LH) using the following steps. WARNING:
Plunger, spring, and spring seat pop out when squeezing return -proof clip without holding
plunger head. It may cause serious injuries. Always hold plunger head when removing.
a. Squeeze return-proof clip ends using suitable tool and push the plunger into the chain tensioner body.
b. Secure plunger using stopper pin. • Stopper pin is made from hard wire approximately 1 mm (0.04in) in diameter.
c. Remove the bolts and the chain tensioner.
NOTE:
KBIA0400J
Tool number : KV10111100 (J-37228)
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KBIA2479E

EM-48
< SERVICE INFORMATION >
CAMSHAFT
• Stop plunger in the fully extended position using return-proof clip 1if stopper pin is removed.
• Push the plunger 2 into the chain tensioner body while squeezing
the return-proof clip 1. Secure it using stopper pin 3.
6. Remove the chain tensioner cover from the front cover using Tool.
CAUTION:
Do not damage mating surfaces.
7. Remove the chain tensioner (RH) using the following steps. WARNING:
Plunger, spring, and spring seat pop out when squeezing return-proof clip without holding
plunger head. It may cause serious injuries. Always hold plunger head when removing.
a. Squeeze return-proof clip ends using suitable tool and push the plunger into the chain tensioner body.
b. Secure plunger using stopper pin. • Stopper pin is made from hard wire approximately 1 mm (0.04
in) in diameter.
c. Remove the bolts and the chain tensioner (RH) (A). NOTE:
If it is difficult to push plunger on chain tensioner (RH) (A),
remove the plunger under extended condition.
KBIA2483E
Tool number : KV10111100 (J-37228)
KBIA2521E
KBIA2479E
WBIA0705E

CAMSHAFTEM-49
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8. Loosen camshaft sprocket bolts as shown and remove camshaft
sprockets.
CAUTION:
To avoid interference between valves and pistons, do not
turn crankshaft or camshaft with timing chain discon-
nected.
9. Remove the RH front cover bolts (A) and LH front cover bolts (B).
10. Remove RH (A) camshaft bracket bolts and LH (C) camshaft bracket bolts in the reverse of order shown to remove camshaft
brackets.
• Remove No. 1 camshaft bracket.NOTE:
The bottom and front surface of bracket will be stuck because
of liquid gasket.
• ⇐ : Engine front
• B: Exhaust
• D: Intake
11. Remove the camshaft.
12. Remove the valve lifters if necessary. • Correctly identify location where each part is removed from.
Keep parts organized to avoid mixing them up.
INSPECTION AFTER REMOVAL
Camshaft Runout
KBIA2485E
WBIA0706E
WBIA0707E

EM-50
< SERVICE INFORMATION >
CAMSHAFT
1. Put V block on precise flat work bench, and support No. 1 andNo. 5 journals of the camshaft.
2. Set dial indicator vertically to No. 3 journal.
3. Turn the camshaft to one direction, and measure the camshaft runout on dial indicator (total indicator reading).
• If measurement exceeds specif ication, replace the camshaft.
Camshaft Cam Height
• Measure the camshaft cam height.
• If measurement is not within the specifications, replace the cam-
shaft.
Camshaft Journal Clearance
Camshaft Journal Diameter• Measure the diameter of the camshaft journal.
Camshaft Bracket Inner Diameter• Tighten the camshaft bracket bolt to the specified torque.
• Measure the inner diameter of the camshaft bracket.
Calculation of Camshaft Journal Clearance
(Journal clearance) = (camshaft bracket inner diameter) – (camshaft
journal diameter)
• If measurement is not within spec ification, replace either or both
camshaft and cylinder head.
NOTE:
The inner diameter of the camshaft bracket is manuf actured together with the cylinder head. Replace the
whole cylinder head as an assembly.
Camshaft End Play
Camshaft runout : Less than 0.02 mm (0.0008 in)
EMK0641D
Standard cam height
Intake: : 45.865 - 45.055 mm
(1.7663 - 1.7738 in)
Standard Cam height
Exhaust: : 45.075 - 45.265 mm
(1.7746 - 1.7821 in)
Cam wear limit
(intake & exhaust) : 0.02 mm (0.0008 in)
PBIC0039E
Standard diameter : 25.950 - 25.970 mm
(1.0217 - 1.0224 in)
PBIC0040E
Standard : 26.000 - 26.021 mm (1.0236 - 1.0244 in)
Standard : 0.030 - 0.068 mm (0.0012 - 0.0027 in)
PBIC1645E