sensor INFINITI QX56 2008 Factory Service Manual

TIMING CHAINEM-45
< ON-VEHICLE REPAIR >
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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

CAMSHAFTEM-53
< ON-VEHICLE REPAIR >
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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-68
< ON-VEHICLE REPAIR >
CYLINDER HEAD
CYLINDER HEAD
Exploded ViewINFOID:0000000006055158
Removal and InstallationINFOID:0000000006055159
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-14, "
Drive Belt Auto Tensioner and Idler Pulley".
• Generator assembly and bracket. Refer to CHG-22, "
Removal and Installation".
• Fuel tube and fuel injector assembly. Refer to EM-40, "
Removal and Installation".
• Intake manifold. Refer to EM-26, "
Removal and Installation".
• Thermostat housing and hose. Refer to CO-22, "
Removal and Installation".
• Rocker cover. Refer to EM-38, "
Removal and Installation".
• Oil pan and oil strainer. Refer to EM-33, "
Removal and Installation".
3. Remove the crankshaft pulley, front cover, oil pump, and timing chain. Refer to EM-45, "
Removal and
Installation".
4. Remove the camshaft sprockets and camshafts. Refer to EM-53, "
Removal and Installation".
5. Remove the cylinder head bolts in reverse of order shown.
6. Remove the cylinder heads.
INSPECTION AFTER REMOVAL
Cylinder Head Bolts Diameter
1. Harness bracket 2. Engine coolant temperature sensor 3. Washer
4. Cylinder head gasket (LH) 5. Cylinder head (RH) 6. Cylinder head bolt
7. Cylinder head gasket (RH) 8. Cylinder head (LH)
KBIA2528E
PBIC0068E
Revision: March 2010 2008 QX56

EM-82
< DISASSEMBLY AND ASSEMBLY >
ENGINE UNIT
DISASSEMBLY AND ASSEMBLY
ENGINE UNIT
Disassembly and AssemblyINFOID:0000000001538832
1. Knock sensor sub-harness 2. Knock sensor3. Cylinder block
4. Main bearing upper 5. Top ring6. Second ring
7. Oil ring 8. Crankshaft key9. Piston
10. Connecting rod 11. Snap ring12. Piston pin
13. Connecting rod bearing 14. Connecting rod bearing cap 15. Main bearing cap
WBIA0471E
Revision: March 2010 2008 QX56

ENGINE UNITEM-83
< DISASSEMBLY AND ASSEMBLY >
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DISASSEMBLY
NOTE:
Explained here is how to disassemble with engine stand supporting transmission surface. When using differ-
ent type of engine stand, some steps may be different.
1. Remove engine assembly and mount to engine stand. Refer to
EM-78, "
Removal and Installation".
CAUTION:
Before removing the hanging chains, make sure engi ne stand is stable and there is no risk of over-
turning.
2. Drain engine oil. Refer to LU-9, "
Changing Engine Oil".
3. Drain engine coolant by removing the cylinder block drain plugs “A”, “B”, “C” and “D” as shown.
4. Remove the following components and associated parts (the parts referred to in step 1 are not included here).
• Oil pan (upper and lower) and oil strainer. Refer to EM-33, "
Removal and Installation".
• Crankshaft pulley, front cover and timing chain. Refer to EM-45, "
Removal and Installation".
• Camshaft. Refer to EM-53, "
Removal and Installation".
• Cylinder head. Refer to EM-68, "
Removal and Installation".
5. Remove knock sensor and sub harness. CAUTION:
Carefully handle sensor, avoiding shocks.
6. Check connecting rod side clearance. Refer to EM-90, "
Inspection After Disassembly".
7. Remove piston and connecting rod assembly as follows.
a. Position the crankshaft pin corresponding to the connecting rod to be removed onto bottom dead center.
b. Remove connecting rod cap.
16. Thrust bearing lower 17. Main bearing lower18. Crankshaft
19. Pilot converter 20. Thrust bearing upper21. Side bolt
22. Drive plate 23. Reinforcement plate24. Rear oil seal retainer
25. Rear oil seal 26. Transmission27. O-ring
28. Crankshaft position sensor (POS) 29. Gasket 30. Cylinder block heater
31. Connector cap
WBIA0419E
KBIA2549E
Revision: March 2010 2008 QX56

EM-90
< DISASSEMBLY AND ASSEMBLY >
ENGINE UNIT
16. Install knock sensors.CAUTION:
If knock sensor is dropped, replace it with a new one.
• Make sure that there is no foreign material on the cylinderblock mating surface and the back surface of knock sensor.
• Install it with its connector facing the center of the cylinder
block side.
• Do not tighten knock sensor bolts while holding connector.
• Make sure knock sensor does not interfere with other parts.
• Position the sub-harness as shown before installing intake manifold.
17. Installation of the remaining components is in the reverse order of removal.
18. Remove engine assembly from engine stand.
19. Install drive plate. • Align dowel pin of crankshaft rear end with pin holes of eachpart to install.
• Install drive plate, reinforcement plate and pilot converter (if not installed in step 4) as shown.
• Face the chamfered or rounded edge side to the crankshaft.
Inspection After DisassemblyINFOID:0000000001538833
CRANKSHAFT END PLAY
KBIA2493E
KBIA2549E
KBIA2494E
KBIA2537E
Revision: March 2010 2008 QX56

EX-2
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000004857579
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inopera tive, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harn esses can be identified by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electri c power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers , always switch the Ignition OFF, disconnect the
battery, and wait at least 3 minu tes before performing any service.
Precaution Necessary for Steering W heel Rotation After Battery Disconnect
INFOID:0000000004857585
NOTE:
• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-
TEM).
• Remove and install all control units after disconnecting both battery cables with the ignition knob in the
″LOCK ″ position.
• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery pow er is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC ″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be rotated.
4. Perform the necessary repair operation.
Revision: March 2010 2008 QX56

EX-4
< PREPARATION >
PREPARATION
PREPARATION
PREPARATION
Special Service ToolINFOID:0000000001538869
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Commercial Service ToolINFOID:0000000001538870
Tool number
(Kent-Moore No.)
Tool name Description
KV10114400
(J-38365)
Heated oxygen sensor wrench Loosening or tightening heated oxygen sen-
sors:
a: 22 mm (0.87 in)
S-NT636
(Kent-Moore No.)
Tool name
Description
(J-43897-18)
(J-43897-12)
Oxygen sensor thread cleaner Reconditioning the exhaust system threads
before installing a new heated oxygen sensor
(Use with anti-seize lubricant shown below):
a: J-43897-18 (18 mm, 0.71 in) dia.
b: J-43897-12 (12 mm, 0.47 in) dia.
Anti-seize lubricant (Permatex 133AR
or equivalent meeting MIL specifica-
tion MIL-A-907) Lubricating oxygen sensor thread cleaning
tool when reconditioning exhaust system
threads
Power tool Loosening nuts and bolts
AEM488
AEM489
PBIC0190E
Revision: March 2010 2008 QX56

EX-6
< ON-VEHICLE REPAIR >
EXHAUST SYSTEM
ON-VEHICLE REPAIR
EXHAUST SYSTEM
Removal and InstallationINFOID:0000000001538872
Exhaust System
CAUTION:
• Be sure to use genuine exhaust system parts or equivalents which are specially designed for heatresistance, corrosion resistance, and shape.
• Perform the operation with the exh aust system fully cooled. The system will be hot just after the
engine stops.
• Be careful not to cut your hand on the heat insulator edge.
REMOVAL
Remove exhaust system components using power tool.
• Remove heated oxygen sensor as needed using Tool.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
• Always replace exhaust gaskets with new ones when reassembling.
• Before installing a new heated o xygen sensor, clean and lube the exhaust tube threads using Tool.
AWBIA0667GB
1. Tailpipe hanger bracket 2. Tailpipe3. Gasket
4. Main muffler 5. Right front exhaust tube6. Ring gasket
7. Heated oxygen sensor 2 (bank 2) 8. Heated oxygen sensor 2 (bank 1) 9. Left front exhaust tube
10. Center exhaust tube 11. Muffler hanger bracket front 12. Muffler hanger bracket rear
Front
Tool number : KV1011440 (J-38365)
Revision: March 2010 2008 QX56

EXHAUST SYSTEMEX-7
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O• Discard any heated oxygen sensor which has been dr
opped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a co ncrete floor; replace with a new one.
• Do not over-torque the heated oxygen sensor. Doing so may damage the heated oxygen sensor,
resulting in the MIL coming on.
• If any mounting insulator is badly deformed, repair or replace it. If deposits such as mud pile up on
the mounting insulators, clean and inspect them.
• Temporarily tighten the nuts on the exhaust manifold side and th e bolts on the vehicle side. Check
each part for interference with other components, an d then tighten the nuts and bolts to specifica-
tion.
INSPECTION AFTER INSTALLATION
• With the engine running, check exhaust tube joints for gas leakage and unusual noises.
• Check to ensure that mounting brackets and mount ing rubbers are installed properly and free from undue
stress. Improper installation could resu lt in excessive noise and vibration.
Tool number A: — (J-43897-18)
B: — (J-43897-12)
Revision: March 2010 2008 QX56