2008 INFINITI QX56 engine

TIMING CHAINEM-45
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Removal and InstallationINFOID:0000000001538821
NOTE:
• To remove timing chain and associated parts, start with those on the LH bank. The procedure for removing
parts on the RH bank is omitted because it is t he same as that for removal on the LH bank.
• To install timing chain and associated parts, start 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.
REMOVAL
1. Remove the engine assembly from the vehicle. Refer to EM-78, "Removal and Installation".
2. Remove the following components and related parts: • Drive belt auto tensioner and idler pulley. Refer to EM-13, "
Removal and Installation".
• Thermostat housing and water hose. Refer to CO-22, "
Removal and Installation".
• Power steering oil pump bracket. Refer to ST-26, "
Removal and Installation".
• Oil pan (lower), (upper) and oil strainer. Refer to EM-33, "
Removal and Installation".
• Ignition coil. Refer to EM-37, "
Removal and Installation".
• Rocker cover. Refer to EM-38, "
Removal and Installation".
3. Remove the Intake valve timing control solenoid valve cover (RH) (A) and Intake valve timing control solenoid valve cover
(LH) (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.
1. Camshaft sprocket (LH) bank EXH 2. Camshaft sprocket (LH) bank INT (VTC)3. Camshaft sprocket (RH) bank INT
(VTC)
4. Camshaft sprocket (RH) bank EXH 5. Front cover 6. Intake valve timing control solenoid
valve (RH)
7. Intake valve timing control solenoid valve cover (RH) 8. Intake valve timing control position
sensor (RH) 9. Intake valve timing control position
sensor (LH)
10. Intake valve timing control solenoid valve cover (LH) 11. Camshaft position
sensor (PHASE) 12 Cran kshaft pulley bolt
13. Crankshaft pulley 14. Chain tensioner cover 15. Front oil seal
16. Intake valve timing control solenoid valve (RH) 17. O-ring
18. Timing chain tension guide (RH)
bank
19. Timing chain slack guide (RH) 20. Timing chain (RH) bank 21. Timing chain (LH)
22. Chain tensioner (RH) 23. Timing chain slack guide (LH) bank 24. Timing chain tension guide (LH) bank
25. Chain tensioner (LH) 26. O-ring 27. Bracket
28. Oil pump drive spacer 29. Oil pump assembly 30. Crankshaft sprocket
A. To crankshaft B. To camshaft (LH) bank EXH C. To camshaft (LH) bank INT (VTC)
D. To camshaft (RH) bank INT (VTC) E. To camshaft (RH) bank EXH F. Apply sealant to mating side
G. Follow installation procedure
Tool number : KV10111100 (J-37228)
WBIA0798E
Revision: March 2010 2008 QX56

EM-50
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TIMING CHAIN
7. Install the oil pump drive spacer as follows:• Install so that the front mark on the front edge of the oil pumpdrive 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-15, "
Recommended Chemical Products and Sealants".
10. Install the front cover as follows:
a. Install a new O-ring on the cylinder block.
KBIA2490E
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Revision: March 2010 2008 QX56

EM-52
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TIMING CHAIN
a. Apply engine oil onto the threaded parts of the bolt and seating area.
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.
INSPECTION AFTER INSTALLATION
• Before starting engine, check oil/fluid levels incl uding engine coolant and engine oil. If less than required
quantity, fill to the specified level. Refer to MA-12, "
Fluids and Lubricants".
• Use procedure below to check for fuel leakage.
• Turn ignition switch ON (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leak- age at connection points.
• Start engine. With engine speed increased, che ck again for fuel leakage at connection points.
• Run engine to check for unusual noise and vibration.
• Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gas, or any oils/fluids including
engine oil and engine coolant.
• Bleed air from passages in lines and hoses, such as in cooling system.
• After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to spec-
ified level, if necessary.
• Summary of the inspection items:
*Power steering fluid, brake fluid, etc.
Crankshaft pulley bolt torque
Step 1 : 93.1 N·m (9.5 kg-m, 69 ft-lb)
Step 2 : additional 90 ° (angle tightening)
KBIA2519E
Item Before starting engine Engine runningAfter engine stopped
Engine coolant LevelLeakage Level
Engine oil LevelLeakage Level
Transmission/
transaxle fluid A/T and CVT Models
LeakageLevel/Leakage Leakage
M/T Models Level/Leakage LeakageLevel/Leakage
Other oils and fluids* LevelLeakage Level
Fuel LeakageLeakage Leakage
Exhaust gas —Leakage —
Revision: March 2010 2008 QX56

CAMSHAFTEM-53
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CAMSHAFT
ComponentsINFOID:0000000001538822
Removal and InstallationINFOID:0000000001538823
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-38, "Removal and Installation".
AWBIA0101GB
1. Cylinder head RH bank2. Camshaft bracket (No. 2, 3, 4, 5) 3. Valve lifter
4. Camshaft bracket (No. 1) 5. Seal washer6. 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) (VTC)12. Camshaft sprocket LH bank (INT)
(VTC)
13. Camshaft sprocket LH bank (EXH) 14. Camshaft position sensor (PHASE) 15. O-ring
16. Cylinder head LH bank A. Follow installation procedure
Revision: March 2010 2008 QX56

EM-56
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CAMSHAFT
c. Remove the bolts and the RH bank timing chain tensioner (A).NOTE:
If it is difficult to push plunger on RH bank timing chain tensioner
(A), remove the plunger under extended condition.
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 side
• D: Intake side
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EM-62
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CAMSHAFT
5. Install the camshaft sprockets using the following procedure:• A: LH bank shown
a. Install the camshaft sprockets aligning them with the matching marks painted on the timing chain (B) and the camshaft sprock-
ets (C) before removal. Align the camshaft sprocket key groove
with the dowel pin on the camshaft front edge at the same time.
Then temporarily tighten camshaft sprocket bolts.
• Install the intake (VTC) (A) and exhaust (B) side camshaft
sprockets by selectively using the groove of the dowel pin
according to the bank for exhaust (B) side camshaft sprockets.
(Common part used for both banks.)
b. Lock the hexagonal part of the camshaft in the same way as for removal, and tighten the camshaft sprocket bolts.
c. Check again that the timing alignment mark on the timing chain and on each sprocket are aligned.
6. Install the chain tensioner using the following procedure: NOTE:
LH is shown.
a. Install the chain tensioner. • Compress the plunger and hold it using a stopper pin when
installing.
• Loosen the slack guide side timing chain by rotating the cam- shaft hexagonal part if mounting space is small.
b. Remove the stopper pin and release the plunger, and then apply tension to the timing chain.
c. Install the RH bank timing chain tensioner cover onto the front cover.
• Apply liquid gasket as shown.Use Genuine RTV Silicone Seal ant or equivalent. Refer to
GI-15, "
Recommended Chemical Products and Sealants".
7. Check and adjust valve clearances. Refer to EM-18, "
Va l v e
Clearance".
8. Installation of the remaining components is in the reverse order of removal.
Inspection after InstallationINFOID:0000000001538824
INSPECTION OF CAMSHAFT SPROCKET (INT) OIL GROOVE
CAUTION:
• Perform this inspection only when DTC P0011 is detected in self-diagnostic results of CONSULT III
and it is directed accordi ng to inspection procedure of EC section. Refer to EC-90, "
On Board Diag-
nosis Logic".
• Check when engine is cold so as to pr event burns from any splashing engine oil.
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Chain tensioner bolts : 6.9 N·m (0.70 kg-m, 61 in-lb)
Tensioner cover bolts : 9.0 N·m (0.92 kg-m, 80 in-lb)KBIA2479E
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Revision: March 2010 2008 QX56

CAMSHAFTEM-63
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1. Check engine oil level. Refer to
LU-8, "Inspection".
2. Perform the following procedure so as to prevent the engine from being unintentionally started while checking.
a. Release fuel pressure. Refer to EC-494, "
Fuel Pressure Check".
b. Disconnect ignition coil and injector harness connectors if practical.
3. Remove IVT control solenoid valve.
4. Crank engine, and then make sure that engine oil comes out from IVT control cover oil hole. End cranking after checking.
WARNING:
Be careful not to touch rotating parts (drive be lts, idler pulley, and crankshaft pulley, etc.).
CAUTION:
• Engine oil may squirt from IVT control solenoid valve installation hole during cranking. Use a
shop cloth to prevent engine oil from splash ing on worker, engine components and vehicle.
• Do not allow engine oil to get on rubber components such as drive belts or engine mount insula- tors. Immediately wipe off any splashed engine oil.
5. Clean oil groove between oil strainer and IVT control solenoid valve if engine oil does not come out from IVT control valve cover oil hole. Refer to LU-7, "
Schematic".
6. Remove components between IVT control solenoid valve and camshaft sprocket (INT), and then check each oil groove for clogging.
• Clean oil groove if necessary.
7. After inspection, installation of the remaining components is in the reverse order of removal.
Revision: March 2010 2008 QX56

EM-64
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OIL SEAL
OIL SEAL
Removal and Installation of Valve Oil SealINFOID:0000000001538825
REMOVAL
1. Remove the camshaft relating to the valve oil seal to be removed. Refer to EM-53, "Removal and Installa-
tion".
2. Remove the valve lifters. Refer to EM-53, "
Components".
• Correctly identify the location where each part is removed from. Keep parts organized to avoid mixing
them up.
3. Turn the crankshaft until the cylinder requiring new oil seals is at TDC. This will prevent the valve from
dropping into the cylinder.
4. Remove the valve collet using Tool.
CAUTION:
Do not damage the valve lifter holes.
5. Remove the valve spring retainer and valve spring. CAUTION:
Do not remove the valve spring seat from the valve spring.
6. Remove the valve oil seal using Tool.
INSTALLATION
Installation is in the reverse order of removal.
• Install the valve oil seal using Tool.
• Apply new engine oil on the new valve oil seal joint and seal lip.
• Install the valve oil seal to the specified height "H".
Removal and Installation of Front Oil SealINFOID:0000000001538826
REMOVAL
1. Remove radiator. Refer to EM-24, "Removal and Installation".
2. Remove drive plate cover. Tool number : KV10116200 (J-26336-A)
: KV10115900 (J-26336-20)
: KV10109220 ( — )
WBIA0578E
Tool number : KV10107902 (J-38959)
WBIA0478E
Tool number : KV10115600 (J-38958)
Height"H" (without valve spring installed)Intake and exhaust : 14.3 - 14.9 mm (0.563 - 0.587 in)
WBIA0490E
Revision: March 2010 2008 QX56