INFINITI QX56 2004 Factory Service Manual

EM-38Revision: August 2007
TIMING CHAIN
2004 QX56
10. Remove the oil pump drive spacer.

Hold and remove the flat space of the oil pump drive spacer
by pulling it forward.
11. Remove the oil pump. Refer to LU-13, "
Removal and Installation" .
12. Remove the chain tensioner on the left bank using the following steps.
NOTE:
To remove the timing chain and associated parts, start with those on the left bank. The procedure for
removing parts on the right bank is omitted because it is the same as that for the left bank.
a. Squeeze the return-proof clip ends using suitable tool and push
the plunger into the tensioner body.
b. Secure the plunger using stopper pin.

Stopper pin is made from hard wire approximately 1 mm (0.04
in) in diameter.
c. Remove the bolts and chain tensioner.
WAR NIN G:
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.
NOTE:

Stop the plunger in the fully extended position by using the
return-proof clip 1 if the stopper pin is removed.

Push the plunger 2 into the tensioner body while squeezing
the return-proof clip 1. Secure it using stopper pin 3.
13. Remove the chain tension guide and slack guide.
14. Remove the timing chain and crankshaft sprocket.
15. Loosen the camshaft sprocket bolts as shown and remove the
camshaft sprocket.
CAUTION:
To avoid interference between valves and pistons, do not
turn crankshaft or camshaft when timing chain is discon-
nected.
16. Repeat the same procedure to remove the right timing chain and
associated parts.
KBIA2512E
KBIA2479E
KBIA2483E
KBIA2513E

TIMING CHAIN
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INSPECTION AFTER REMOVAL
Check for cracks and any excessive wear at link plates. Replace
chain if necessary.

In the same way as for left bank, inspect timing chain and asso-
ciated parts on right bank.
INSTALLATION
NOTE:

The above figure shows the relationship between the mating mark on each timing chain and that of the
corresponding sprocket, with the components installed.

To install timing chain and associated parts, start with those on the right bank. The procedure for installing
parts on the left bank is omitted because it is the same as that for installation on the right bank.
1. Make sure the crankshaft key and dowel pin of each camshaft
are facing in the direction as shown.
PBIC0282E
KBIA2514E
SBIA0356E

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TIMING CHAIN
2004 QX56
2. Install camshaft sprockets.

Install intake and exhaust camshaft sprocket by selectively
using the groove of dowel pin according to the bank (common
part used for both banks).

Lock the hexagonal part of camshaft in the same way as for
removal, and tighten bolts.
3. Install crankshaft sprockets for both banks.

Install each crankshaft sprocket so that its flange side (the
larger diameter side without teeth) faces in the direction as
shown.
NOTE:
The same parts are used but facing directions are different.
4. Install timing chains and associated parts.

Align the mating mark on each sprocket and the timing chain for installation.
CAUTION:

Before installing chain tensioner, it is possible to change the position of mating mark on tim-
ing chain and each sprocket. After the mating marks are aligned, keep them aligned by hold-
ing them by hand.

Install slack guides and tension guides onto correct side by checking with identification mark on sur-
face.

Install chain tensioner with plunger locked in with stopper pin.
CAUTION:

Before and after the installation of chain tensioner, make sure that the mating mark on timing
chain is not out of alignment.

After installing chain tensioner, remove the stopper pin to release tensioner. Make sure ten-
sioner is released.

To avoid chain-link skipping of timing chain, never move crankshaft or camshafts until front
cover is installed.
5. In the same way as for right bank, install the timing chain and associated parts on the left side.
6. Install the oil pump.
7. Install the oil pump drive spacer as follows:

Install so that the front mark on the front edge of oil pump
drive spacer faces the front of the engine.

Insert oil pump drive spacer according to the directions of the
crankshaft key and the two flat surfaces of oil pump inner
rotor.

If the positional relationship does not allow the insertion,
rotate oil pump inner rotor to allow the oil pump drive spacer
to be inserted.
KBIA2480E
KBIA2515E
KBIA2490E

TIMING CHAIN
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8. Install front oil seal using suitable tool.
CAUTION:
Do not scratch or make burrs on the circumference of the
oil seal.
9. Install chain tensioner cover.

Apply liquid gasket as shown.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-45, "
Recommended Chemical Products and Seal-
ants" .
10. Install front cover as follows:
a. Install new O-ring on cylinder block.
b. Apply liquid gasket as shown.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-45, "
Recommended Chemical Products and Sealants".
c. Check again that the timing mating mark on timing chain and
that on each sprocket are aligned. Then, install front cover.
PBIC0059E
KBIA2547E
KBIA2516E
KBIA2517E

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TIMING CHAIN
2004 QX56
d. Install bolts in the numerical order shown.
e. Tighten to the specified torque.
CAUTION:
Be sure to wipe off any excessive liquid gasket leaking onto
surface mating with oil pan.
11. Install chain case cover (right bank) and (left bank) as follows:
a. Apply liquid gasket as shown.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-45, "
Recommended Chemical Products and Sealants".
CAUTION:
Both the start and end of application of liquid gasket should
be crossed at an invisible position after attaching the chain
case cover.
b. Install 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 belt is installed (outer circumference).
13. Tighten the crankshaft pulley bolt.

Lock crankshaft using suitable tool, then tighten the bolt.

Perform the following steps for angular tightening:
a. Apply engine oil onto threaded parts of bolt and seating area.
b. Select one most visible notch of the four on bolt flange. Corre-
sponding to the selected notch, put a mating mark (such as
paint) on crankshaft pulley.
14. Rotate 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 order
of removal.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
KBIA2481E
WBIA0468E
Crankshaft pulley bolt torque
Step 1 : 93.1 N·m (9.5 kg-m, 69 ft-lb)
Step 2 : additional 90° (angle tightening)
KBIA2519E

CAMSHAFT
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CAMSHAFTPFP:13001
Removal and InstallationEBS00ILN
* Refer to GI-45, "Recommended Chemical Products and Sealants" .
REMOVAL
1. Remove rocker cover (right bank) and (left bank). Refer to EM-33, "ROCKER COVER" .
2. Obtain compression TDC of No. 1 cylinder as follows:
a. Turn crankshaft pulley clockwise to align the TDC identification
notch (without paint mark) with timing indicator on front cover.
1. Cylinder head (right bank) 2. Camshaft bracket (No. 2, 3, 4, 5) 3. Valve lifter
4. Camshaft bracket (No. 1) 5. Seal washer 6. Camshaft (right bank EXH)
7. Camshaft (right bank INT) 8. Camshaft (left bank INT) 9. Camshaft (left bank EXH)
10. Camshaft sprocket (right bank EXH) 11. Camshaft sprocket (right bank INT) 12. Camshaft sprocket (left bank INT)
13. Camshaft sprocket (left bank EXH) 14. Camshaft position sensor (PHASE) 15. O-ring
16. Cylinder head (left bank)
WBIA0469E
KBIA2476E

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CAMSHAFT
2004 QX56
b. At this time, make sure both intake and exhaust cam lobes of
No. 1 cylinder (top front on left bank) point outside.

If they do not point outside, turn crankshaft pulley once more.
3. Remove the chain case cover (right bank) and (left bank).
a. Loosen and remove the bolts in the reverse order shown.
b. Cut the liquid gasket to remove covers using Tool.
CAUTION:
Do not damage mating surfaces.
4. Paint matching marks on the timing chain links aligning with
camshaft sprocket matching marks.
5. Remove the chain tensioner on the left bank using the following steps.
WAR NIN G:
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 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.
KBIA0400J
Tool number: KV10111100 (J-37228)
KBIA2475E
KBIA2488E
KBIA2479E

CAMSHAFT
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NOTE:

Stop plunger in the fully extended position using return-proof clip
1 if stopper pin is removed.

Push the plunger 2 into the tensioner body while squeezing the
return-proof clip 1. Secure it using stopper pin 3.
6. Remove the right chain tensioner cover from the front cover
using Tool.
CAUTION:
Use care not to damage mating surfaces.
7. Remove chain tensioner on right bank using the following steps.
WAR NIN G:
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 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 right bank chain tensioner.
NOTE:
If it is difficult to push plunger on right bank chain tensioner,
remove the plunger under extended condition.
KBIA2483E
Tool number : KV10111100
KBIA2521E
KBIA2479E
KBIA2484E

EM-46Revision: August 2007
CAMSHAFT
2004 QX56
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 front cover bolts.
10. Remove 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.
11. Remove camshaft.
12. Remove valve lifters if necessary.

Correctly identify location where each part is removed from.
Keep parts organized to avoid mixing them up.
KBIA2485E
KBIA2486E
KBIA2522E

CAMSHAFT
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INSPECTION AFTER REMOVAL
Camshaft Runout
1. Put V block on precise flat work bench, and support No. 1 and
No. 5 journal of camshaft.
2. Set dial gauge vertically to No. 3 journal.
3. Turn camshaft to one direction with hands, and measure cam-
shaft runout on dial gauge.

1/2 of runout is bend.

If measurement exceeds specification, replace camshaft.
Camshaft Cam Height

Measure camshaft cam height.

If measurement is not within the specifications, replace cam-
shaft.
Camshaft Journal Clearance
Camshaft Journal Diameter

Measure diameter of camshaft journal.
Camshaft Bracket Inner Diameter

Tighten camshaft bracket bolt to specified torque.

Measure inner diameter of camshaft bracket.
Calculation of Camshaft Journal Clearance
(Journal clearance) = (camshaft bracket inner diameter) – (camshaft
journal diameter)

If measurement is not within specification, replace either or both
camshaft and cylinder head.
NOTE:
Inner diameter of camshaft bracket is manufactured together with cylinder head. Replace the whole cylin-
der head assembly.Camshaft runout : Less than 0.02 mm (0.0008 in)
EMK0641D
Standard cam height
(intake & exhaust): 44.465 - 44.655 mm
(1.7506 - 1.7581 in)
Cam wear limit
(intake & exhaust): 0.02 mm (0.0008 in)
PBIC0039E
Standard diameter : 25.953 - 25.970 mm
(1.0218 - 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