2011 INFINITI QX56 engine

EM-52
< REMOVAL AND INSTALLATION >
FUEL INJECTOR AND FUEL TUBE
 Always install the back up ring (1) in the right direction as
instructed.
3. Install fuel injector (1) to fuel rail (2) as per the following:
a. Install fuel injector holder (5) to fuel injector. CAUTION:
 Never reuse injector holder. Replace it with a new one.
 Be careful to keep fuel inject or holder from interfering
with O-ring. If interfer ence occurs, replace O-ring.
b. Insert fuel injector into fuel rail with fuel injector holder attached.  Insert it while matching it to the axial center.
 Insert so that protrusion (A) of fuel injector is aligned to cutout
(B).
c. Check that installation is complete by checking that fuel injector does not rotate or come off.
 Check that protrusions of fuel in jectors and fuel rail are aligned
with cutouts of clips after installation.
4. Insert insulator into mounting hole of fuel injector of cylinder head.
5. Install fuel rail and fuel injector assembly to cylinder head.  Tighten mounting bolts and nuts in two steps in numericalorder as shown in the figure.
6. Connect injector harness connector.
7. Install fuel feed tube (bank side) to fuel rail. CAUTION:
 When inserting fuel feed tube (b ank side) to fuel rail, press the flange part to install the tube.
 Never use O-ring with any scoring.
 Never reuse fuel feed tube (ban k side), O-ring and back up ring.
JPBIA3864ZZ
3 : O-ring (blue)
4: Backup ring
JSBIA0352ZZ
: Engine front
1st step : 10.0 N·m (1.0 kg-m, 89 in-lb)
2nd step : 20.5 N·m (2.1 kg-m, 15 ft-lb)
JSBIA0353ZZ
Revision: 2010 May2011 QX56

FUEL INJECTOR AND FUEL TUBEEM-53
< REMOVAL AND INSTALLATION >
C
DE
F
G H
I
J
K L
M A
EM
NP
O
 Apply engine oil to O-ring.
 Tighten mounting bolts in numerical order as shown in the fig-
ure.
8. Install fuel feed tube (pump side) to fuel feed tube (bank side) as per the following:
CAUTION:
Never reuse fuel feed tube (pump side).
a. Apply engine oil to flare screw parts of high pr essure pump side and fuel feed tube (bank side) side.
b. Manually tighten 2 flare nuts without using a t ool until they are seated to screw thread.
c. Tighten mounting bolt (A).
d. Tighten flare nuts in numerical order as shown in the figure.
9. Install in the reverse order of removal.
InspectionINFOID:0000000006289558
INSPECTION AFTER INSTALLATION
Check for Fuel Leakage
1. Turn ignition switch “ON” (with the engine stopped). With fuel pressure applied to fuel piping, check that
there is no fuel leakage at connection points.
NOTE:
Use mirrors for checking at points out of clear sight.
2. Start the engine. With engine speed increased, check again that there is no fuel leakage at connection
points.
CAUTION:
Never touch the engine immediately after it is stopped because the engine is extremely hot.
JPBIA3924ZZ
: Engine front
JSBIA0355ZZ
B :To high pressure fuel pump
: Engine front
JSBIA0356ZZ
Revision: 2010 May2011 QX56

OIL PAN (LOWER) AND OIL STRAINEREM-55
< REMOVAL AND INSTALLATION >
C
DE
F
G H
I
J
K L
M A
EM
NP
O
Removal and InstallationINFOID:0000000006289560
REMOVAL
WARNING:
To avoid the danger of being scalded, never
drain engine oil when engine is hot.
1. Drain engine oil. Refer to LU-8, "
Draining".
2. Remove protector A and protector B. Refer to SCS-32, "
FRONT TUBE ASSEMBLY : Exploded View".
3. Remove front suspension rear cross member. Refer to TM-205, "
2WD : Exploded View" (2WD models) or
TM-208, "
4WD : Exploded View" (4WD models).
4. Remove oil pan (lower) as per the following:
a. Loosen mounting bolts in reverse order as shown in the figure to remove.
b. Insert the seal cutter [SST: KV10111100 (J-37228)] (A) between oil pan (upper) and oil pan (lower).
CAUTION:
 Be careful not to damage the mating surfaces.
 Never insert a screwdriver. This damages the mating sur-faces.
c. Slide the seal cutter by tapping on the side of tool with a ham- mer. Remove oil pan (lower).
5. Remove oil strainer.
INSTALLATION
1. Install oil strainer.
2. Install oil pan (lower) as per the following:
a. Use scraper (A) to remove old liquid gasket from mating sur- faces.
 Remove old liquid gasket from the bolt holes and thread.
CAUTION:
Never scratch or damage th e mating surfaces when clean-
ing off old liquid gasket.
: Engine front
JPBIA3495ZZ
JPBIA0276ZZ
JPBIA0025ZZ
Revision: 2010 May2011 QX56

EM-56
< REMOVAL AND INSTALLATION >
OIL PAN (LOWER) AND OIL STRAINER
b. Apply a continuous bead of liquid gasket with the tube presser(commercial service tool) to the oil pan (lower) as shown in the
figure.
Use Genuine RTV silicone seal ant or equivalent. Refer to
GI-22, "
Recommended Chemical Products and Sealants".
CAUTION:
Attaching must be done with in 5 minutes after coating.
c. Install oil pan (lower).  Tighten mounting bolts in numerical order as shown in the fig-ure.
3. Install oil pan drain plug.  Refer to the figure of the components of on the prior page for installation direction of drain plug washer.Refer to EM-54, "
Exploded View".
4. Install in the reverse order of removal after this step. NOTE:
Wait at least 30 minutes after oil pan is installed before pouring engine oil.
InspectionINFOID:0000000006289561
INSPECTION AFTER REMOVAL
Clean oil strainer if any object is attached.
INSPECTION AFTER INSTALLATION
1. Check the engine oil level and adjust engine oil. Refer to LU-7, "Inspection".
2. Start engine, and check there is no leakage of engine oil.
3. Stop engine and wait for 15 minutes.
4. Check the engine oil level again. Refer to LU-7, "
Inspection".
a : 7.5 - 9.5 mm (0.295 - 0.374 in)
b: φ4.0 - 5.0 mm (0.157 - 0.197 in)
: Engine front
JPBIA3496ZZ
: Engine front
JPBIA3495ZZ
Revision: 2010 May2011 QX56

EM-58
< REMOVAL AND INSTALLATION >
OIL PAN (UPPER)
Removal and Installation
INFOID:0000000006289563
REMOVAL
WARNING:
To avoid the danger of being scalded, never drain engine oil when engine is hot.
1. Remove oil filter. Refer to LU-9, "
Removal and Installation".
2. Remove oil cooler. Refer to LU-11, "
Exploded View".
3. Move A/C compressor to the position without the hindrance for work. Refer to HA-30, "
Exploded View".
4. Remove oil level gauge and oil level gauge guide.
5. Remove oil pressure switch and oil temperature sensor if necessary.
6. Remove rear plate cover.
7. Remove protector A and protector B. Refer to SCS-32, "
FRONT TUBE ASSEMBLY : Exploded View".
8. Remove front suspension rear cross member. Refer to TM-205, "
2WD : Exploded View" (2WD models) or
TM-208, "
4WD : Exploded View" (4WD models).
9. Remove steering gear assembly. Refer to ST-41, "
Exploded View".
10. Remove front final drive assembly. Refer to DLN-162, "
Exploded View".
11. Remove oil pan (lower). Refer to EM-54, "
Exploded View".
12. Remove oil strainer. Refer to EM-54, "
Exploded View".
13. Remove bolts fixing oil pan (upper) to transmission assembly.
14. Remove oil pan (upper) as per the following:
a. Loosen mounting bolts in the reverse order as shown in the fig- ure with power tool to remove.
NOTE:
Disregard No. 9, 16 when loosening.
b. Insert a suitable tool into the notch at oil pan (upper) (1) as shown.
 Pry off case by moving a suitable tool.
CAUTION:
Be careful not to damage the mating surfaces.
15. Remove O-ring from bottom of cylinder block and oil pump.
16. Remove oil pressure switch and oil temperature sensor, if necessary.
INSTALLATION
1. Install oil pan (upper) as per the following:
: Engine front
JPBIA3502ZZ
: Engine front
JPBIA2299ZZ
Revision: 2010 May2011 QX56

OIL PAN (UPPER)EM-59
< REMOVAL AND INSTALLATION >
C
DE
F
G H
I
J
K L
M A
EM
NP
O
a. Use a scraper (A) to remove old liquid gasket from mating sur-
faces.
 Also remove the old liquid gasket from mating surface of cylin-der block.
 Remove old liquid gasket from the bolt holes and threads.
CAUTION:
Never scratch or damage th e mating surfaces when clean-
ing off old liquid gasket.
b. Install new O-rings on the bottom of cylinder block and oil pump.
c. Apply a continuous bead of liquid gasket with tube pre sser (commercial service tool) to the cylinder block
mating surfaces of oil pan (upper) to a limited portion as shown in the figure.
Use Genuine RTV silicone sealant or equivalent. Refer to GI-22, "
Recommended Chemical Prod-
ucts and Sealants".
CAUTION:
Attaching must be done with in 5 minutes after coating.
d. Tighten mounting bolts in numerical order as shown in the fig- ure.
CAUTION:
Install avoiding misal ignment of O-rings.
NOTE:
Tighten mounting bolts No. 1 and 2 in two steps. The numerical
order No. 9 and 16 shown second steps.
 There are four types of mounting bolts. Refer to the following for locating bolts.
e. Tighten transmission joint bolts.
f. Install rear plate cover.
2. Install oil strainer.
JPBIA3503ZZ
a. : 5.5 - 7.5 mm (0.217 - 0.295 in) b. : φ4.0 - 5.0 mm (0.157 - 0.197 in)
: Engine front
JPBIA3504ZZ
: Engine front
JPBIA3502ZZ
Order number for tightening 17, 18 2 (16), 3, 5, 6, 7, 8, 10,
11, 14, 15 1(9), 4 12, 13
Bolt size M6 M8
Bolt length 45 mm (1.77 in) 25 mm (0.98 in) 30.0 mm (1.18 in) 120 mm (4.72 in)
Tightening torque 9.0 N· (0.92 kg-m, 80
in-lb) 22.0 N·m (2.2 kg-m, 16 ft-lb)
Revision: 2010 May2011 QX56

EM-60
< REMOVAL AND INSTALLATION >
OIL PAN (UPPER)
3. Install oil pan (lower). Refer to EM-55, "Removal and Installation".
4. Install in the reverse order of removal. NOTE:
At least 30 minutes after oil pan is installed, pour engine oil.
InspectionINFOID:0000000006289564
INSPECTION AFTER DISASSEMBLY
Clean oil strainer if any object is attached.
INSPECTION AFTER ASSEMBLY
1. Check the engine oil level and adjust engine oil. Refer to LU-9, "Inspection".
2. Start engine, and check there is no leakage of engine oil.
3. Stop engine and wait for 15 minutes.
4. Check the engine oil level again. Refer to LU-9, "
Inspection".
Revision: 2010 May2011 QX56

EM-62
< REMOVAL AND INSTALLATION >
TIMING CHAIN
Removal and Installation
INFOID:0000000006289566
REMOVAL
1. Release fuel pressure. Refer to EC-153, "Work Procedure".
2. Drain engine coolant from radiator. Refer to CO-8, "
Draining".
3. Remove fan shroud (lower). Refer to CO-13, "
Exploded View".
4. Remove fan bracket. Refer to CO-16, "
Exploded View".
5. Remove drive belt auto-tensioner. Refer to EM-26, "
Exploded View".
6. Remove oil level gauge and oil level gauge guide. Refer to EM-57, "
Exploded View".
7. Move power steering oil pump to the posit ion without the hindrance for work. Refer to ST-48, "
Exploded
View".
8. Remove alternator, alternator bracket and alternator stay. Refer to CHG-25, "
Exploded View".
9. Move power steering reservoir tank to the position without the hindrance for work, and then remove Res- ervoir tank bracket. Refer to ST-54, "
Exploded View".
10. Remove camshaft position sensors.
CAUTION:
 Handle carefully to avoid dropping and shocks.
 Never disassemble.
 Never allow metal powder to adhere to magnetic part atsensor tip.
 Never place sensors in a lo cation where they are exposed
to magnetism.
11. Remove high pressure fuel pump and lifter. Refer to EM-43, "
Exploded View".
CAUTION:
After removing lifter, replace lifter with a new one.
12. Remove radiator hose (upper) and radiator hose (lower). Refer to CO-13, "
Exploded View".
13. Remove water suction pipe. Refer to CO-20, "
Exploded View".
14. Remove valve timing control cover as per the following:
a. Disconnect valve timing control solenoid valve harness connector.
10. Slack guide (bank 2) 11. Timing chain tensioner (bank 2) 12. Exhaust camshaft sprocket (bank 1)
13. Timing chain (bank 1) 14. Intake camshaft sprocket (bank 1) 15. Timing chain tensioner (bank 1)
16. Slack guide (bank 1) 17. Tension guide (bank 1) 18. Oil pump
19. Camshaft position sensor (bank 2) 20. O-ring 21. Seal ring
22. Valve timing control cover (bank 2) 23. Intake valve timing control solenoid
valve (bank 2)24. Crankshaft pulley
25. Front oil seal 26. Intake valve timing control solenoid
valve (bank 1)27. Valve timing control cover (bank 1)
28. Timing chain tensioner cover 29. Front cover 30. O-ring
31. Camshaft position sensor (bank 1) 32. Camshaft bracket 33. Oil filter (for valve timing control so-
lenoid valve)
34. Crankshaft sprocket 35. Oil pump drive spacer
A. Comply with the installation proce-
dure when tightening. Refer to
EM-
62, "Removal and Installation".
Refer to GI-4, "
Components" for symbol marks in the figure.
A : Keep free from magnetic materials
JPBIA0454ZZ
Revision: 2010 May2011 QX56