2009 INFINITI QX56 engine

EM-42
< ON-VEHICLE REPAIR >
FUEL INJECTOR AND FUEL TUBE
• Lubricate O-ring with new engine oil.
• Do not clean O-ring with solvent.
• Make sure that O-ring and its mating part are free of foreign material.
• When installing O-ring, be careful not to scratch it with tool or fingernails. Also be careful not to
twist or stretch O-ring. If O-ring was stretc hed while it was being attached, do not insert it
quickly into fuel tube.
• Insert O-ring straight into fuel tube. Do not angle or twist it.
3. Install fuel injector to fuel tube.
a. Insert clip into clip mounting groove on fuel injector. • Insert clip so that lug “A” of fuel injector matches notch “A” ofthe clip.
CAUTION:
• Do not reuse clip. Replace it with a new one.
• Be careful to keep clip from interfering with O-ring. Ifinterference occurs, replace O-ring.
b. Insert fuel injector into fuel tube with clip attached. • Insert it while matching it to the axial center.
• Insert fuel injector so that lug “B” of fuel tube matches notch
“B” of the clip.
• Make sure that fuel tube flange is securely fixed in flange fixing groove on clip.
c. Make sure that installation is complete by checking that fuel injector does not rotate or come off.
• Make sure that protrusions of fuel injectors are aligned withcutouts of clips after installation.
4. Install fuel tube and fuel injector assembly to intake manifold. CAUTION:
Be careful not to let tip of injector nozzle come in contact with other parts.
• Tighten fuel tube assembly bolts “a” to “b” in illustration and in
two steps.
5. Install fuel hose assembly. • Follow the precautions for fuel injector when handling O-ring.
• Insert connectors straight, making sure that the axis is lined up with fuel tube side to prevent O-ring from
being damaged.
• Tighten bolts evenly in several steps.
• Make sure that there is no gap between flange and fuel tube after tightening bolts.
6. Installation of the remaining components is in the reverse order of removal.
INSPECTION AFTER INSTALLATION
After installing fuel tubes, make sure there are no fuel leaks at connections using the following steps.
1. Apply fuel pressure to fuel lines by turning ignition switch ON (with engine stopped). Then check for fuel leaks at connections.
2. Start the engine and rev it up and check for fuel leaks at connections. WARNING:
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1st step : 12.8 N·m (1.3 kg-m, 9 ft-lb)
2nd step : 24.5 N·m (2.5 kg-m, 18 ft-lb)
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FUEL INJECTOR AND FUEL TUBEEM-43
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Do not touch the engine imme
diately after stopping, as engine becomes extremely hot.
NOTE:
Use mirrors for checking on hidden points.
Revision: December 20092009 QX56

TIMING CHAINEM-45
< ON-VEHICLE REPAIR >
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Removal and InstallationINFOID:0000000005885887
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".
• Rocker cover. Refer to EM-38, "
Removal and Installation".
• Generator and generator bracket. Refer to CHG-20, "
Removal and Installation".
• Water pump. Refer to CO-20, "
Exploded View".
3. Disconnect and remove the camshaft position sensor.
4. Disconnect and remove the intake valve ti ming control position sensor (RH and LH).
5. Disconnect and remove the intake valve timing control solenoid valve (RH and LH).
6. 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 in reverse order 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 bank
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 sprockets
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. Refer to EM-45
Tool number : KV10111100 (J-37228)
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EM-50
< ON-VEHICLE REPAIR >
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.
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b. Apply liquid gasket as shown.
Use Genuine RTV Silicone Seal ant or equivalent. Refer to
GI-15, "
Recommended Chemical Products and Sealants".
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 Intake valve timing control solenoid valve cover (RH) (A) and Intake valve timing control solenoid valve cover (LH) (B)
as follows:
• Cross mark that can not be seen after assembly (C)
a. Apply liquid gasket (D) as shown. Use Genuine RTV Silicone Seal ant or equivalent. Refer to
GI-15, "
Recommended Chemical Products and Sealants".
CAUTION:
The start and end of the appl ication of the liquid gasket
should be crossed at a position (C) that cannot be seen
after attaching the chain case cover.
b. Install the bolts and tighten them to specification in the numeri- cal order shown.
• A: Intake valve timing control solenoid valve cover (RH)
• B: Intake valve timing control solenoid valve cover (LH)
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.
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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
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D : 2.6 - 3.6 mm (0.102 - 0.142 in) dia.
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EM-52
< ON-VEHICLE REPAIR >
TIMING CHAIN
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 the engine, check oil/fluid levels in cluding engine coolant and engine oil. If the levels are
lower 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 the fuel piping, check for fuel leakage at the 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. NOTE:
If hydraulic pressure inside timing chain tensioner drops after removal and installation, slack in the guide
may generate a pounding noise during and just after engine start. However, this is normal. Noise will stop
after hydraulic pressure rises.
• 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 the engine, again check oil/fluid levels including engine oil and engine coolant. Refill to
specified level if necessary.
• Summary of the inspection items:
*Transmission/transaxle/CVT fluid, 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
Other oils and fluids* LevelLeakage Level
Fuel LeakageLeakageLeakage
Exhaust gas —Leakage —
Revision: December 20092009 QX56

CAMSHAFTEM-53
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CAMSHAFT
Exploded ViewINFOID:0000000005885888
Removal and InstallationINFOID:0000000005885889
NOTE:
Do not remove the engine assembly to perform this procedure.
REMOVAL
1. Remove the power steering fluid reservoir tank bolts and position the power steering fluid reservoir tank
aside.
2. Remove the RH bank and LH bank rocker covers. Refer to EM-38, "
Removal and Installation".
3. Remove the spark plugs. Refer to EM-16, "
Removal and Installation".
4. Remove the drive belt. Refer to EM-13, "
Removal and Installation".
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1. Cylinder head RH bank 2. 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 INT9. 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. Refer to EM-53
Revision: December 20092009 QX56

EM-56
< ON-VEHICLE REPAIR >
CAMSHAFT
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.
14. 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.
15. Remove the RH (A) front cover bolts and LH (B) front cover bolts.
16. 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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Revision: December 20092009 QX56