belt INFINITI QX56 2011 Factory Workshop Manual

ELECTRICALLY-CONTROLLED COOLING FAN COUPLINGEC-495
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
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ELECTRICALLY-CONTROLLED COOLING FAN COUPLING
Component Function CheckINFOID:0000000006217997
1.CHECK COOLING FAN FUNCTION
WITH CONSULT-III
1. Start the engine.
2. Perform “FAN DUTY CONTROL” in “ACTIVE TEST” mode with CONSULT-III.
3. Check that cooling fan speed varies according to the percentage.
NOTE:
Speed changes gradually as the percentage changes.
WITHOUT CONSULT-III
1. Start the engine and warm up the engine until engine coolant temperature reaches at least 98°C (209 °F).
2. Check that cooling fan speed increase.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Proceed to EC-495, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006217998
1.CHECK DRIVE BELT
1. Turn ignition switch OFF.
2. Check that the drive belt is not broken.
Is inspection result normal?
YES >> GO TO 2.
NO >> Replace drive belt.
2.CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING POWER SUPPLY
1. Disconnect electrically-controlled c ooling fan coupling harness connector.
2. Turn ignition switch ON.
3. Check the voltage between electrically-controll ed cooling fan coupling harness connector and ground.
Is inspection result normal?
YES >> GO TO 3.
NO >> Perform trouble diagnosis for power supply circuit.
3.CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check the continuity between electrically-cont rolled cooling fan coupling harness connector and ground.
Is inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING CONTROL SIGNAL
WITH CONSULT-III
+ −Vo l ta g e
(Approx.)
Electrically-controlled cooling fan coupling
Connector TerminalF39 1 Ground Battery voltage
+ −Continuity
Electrically-controlled cooling fan coupling
Connector TerminalF39 6 Ground Existed
Revision: 2010 May2011 QX56

EM-1
ENGINE
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SECTION EM
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CONTENTS
ENGINE MECHANICAL
PRECAUTION ................ ...............................3
PRECAUTIONS .............................................. .....3
Precaution for Procedure without Cowl Top Cover ......3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................
3
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect .....................................
3
Precaution for Drain Engine Coolant and Engine
Oil ..............................................................................
4
Precaution for Disconnecting Fuel Piping .................4
Precaution for Handling High Pressure Fuel Sys-
tem ............................................................................
4
Precaution for Removal and Disassembly ................4
Precaution for Inspection, Repair and Replace-
ment ..........................................................................
4
Precaution for Assembly and Installation ..................4
Parts Requiring Angle Tightening .............................5
Precaution for Liquid Gasket .....................................5
Definitions of Bank Names ........................................6
PREPARATION ............................................7
PREPARATION .............................................. .....7
Special Service Tool ........................................... ......7
Commercial Service Tool ..........................................9
BASIC INSPECTION ...................................12
CAMSHAFT VALVE CLEARANCE ............... ....12
Inspection ............................................................ ....12
COMPRESSION PRESSURE ............................16
Inspection ............................................................ ....16
SYMPTOM DIAGNOSIS ..............................18
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING ........................ ....
18
NVH Troubleshooting - Engine Noise .............. ....18
Use the Chart Below to Help You Find the C
ause of the Symptom ........................................ ....
19
PERIODIC MAINTENANCE ........................20
DRIVE BELTS ...................................................20
Exploded View ..................................................... ....20
Checking ..................................................................20
Tension Adjustment ................................................20
Removal and Installation .........................................20
Inspection ................................................................21
AIR CLEANER FILTER .....................................22
Exploded View .........................................................22
Removal and Installation .........................................22
SPARK PLUG ...................................................23
Exploded View .........................................................23
Removal and Installation .........................................23
Inspection ................................................................24
REMOVAL AND INSTALLATION ...............25
ENGINE COVER ...............................................25
Exploded View ..................................................... ....25
Removal and Installation .........................................25
DRIVE BELT AUTO TENSIONER AND IDLER
PULLEY .............................................................
26
Exploded View .........................................................26
Removal and Installation .........................................26
AIR CLEANER AND AIR DUCT .......................27
Exploded View .........................................................27
Removal and Installation .........................................27
Inspection ................................................................28
IGNITION COIL .................................................29
Exploded View .........................................................29
Removal and Installation .........................................29
INTAKE MANIFOLD .........................................30
Exploded View .........................................................30
Revision: 2010 May2011 QX56

EM-2
Removal and Installation ........................................30
ROCKER COVER ..............................................33
Exploded View ..................................................... ...33
Removal and Installation ........................................33
VVEL ACTUATOR ASSEMBLY ........................36
Exploded View ..................................................... ...36
Removal and Installation ........................................36
Inspection ...............................................................39
EXHAUST MANIFOLD AND THREE WAY
CATALYST ........................................................
40
Exploded View ..................................................... ...40
Removal and Installation ........................................40
Inspection ...............................................................42
HIGH PRESSURE FUEL PUMP AND FUEL
HOSE .................................................................
43
Exploded View ..................................................... ...43
Removal and Installation ........................................43
Inspection ...............................................................46
FUEL INJECTOR AND FUEL TUBE .................48
Exploded View ..................................................... ...48
Removal and Installation ........................................49
Inspection ...............................................................53
OIL PAN (LOWER) AND OIL STRAINER .........54
Exploded View ..................................................... ...54
Removal and Installation ........................................55
Inspection ...............................................................56
OIL PAN (UPPER) .......................................... ...57
Exploded View ..................................................... ...57
Removal and Installation ........................................58
Inspection ...............................................................60
TIMING CHAIN ............................................... ...61
Exploded View ..................................................... ...61
Removal and Installation ........................................62
Inspection ...............................................................72
CAMSHAFT .......................................................74
Exploded View ..................................................... ...74
Removal and Installation ........................................75
Inspection ...............................................................77
CYLINDER HEAD ..............................................86
Exploded View ..................................................... ...86
Removal and Installation ........................................87
Disassembly and Assembly ....................................89
Inspection ............................................................. ...92
OIL SEAL ...........................................................96
FRONT OIL SEAL .................................................. ...96
FRONT OIL SEAL : Removal and Installation ........96
REAR OIL SEAL .................................................... ...96
REAR OIL SEAL : Removal and Installation ...........97
UNIT REMOVAL AND INSTALLATION ....98
ENGINE ASSEMBL Y ..................................... ...98
Exploded View ..................................................... ...98
Removal and Installation .........................................99
Inspection ..............................................................102
UNIT DISASSEMBLY AND ASSEMBLY ..103
ENGINE STAND SETTING ..............................103
Setting .................................................................. .103
ENGINE UNIT ...................................................105
Disassembly ......................................................... .105
Assembly ..............................................................105
CYLINDER BLOCK ..........................................106
Exploded View ..................................................... .106
Disassembly and Assembly ..................................107
Inspection ..............................................................115
HOW TO SELECT PISTON AND BEARING ...125
Description ........................................................... .125
Piston ....................................................................125
Connecting Rod Bearing .....................................126
Main Bearing ........................................................128
SERVICE DATA AND SPECIFICATIONS
(SDS) ........ .................................................
132
SERVICE DATA AND SPECIFICATIONS
(SDS) .............................................................. ..
132
General Specification .......................................... .132
Drive Belts .............................................................132
Spark Plug ............................................................132
Exhaust Manifold ..................................................133
Camshaft ...............................................................133
Cylinder Head ......................................................135
Cylinder Block ......................................................137
Main Bearing ........................................................141
Connecting Rod Bearing .....................................142
Revision: 2010 May2011 QX56

PRECAUTIONSEM-3
< PRECAUTION >
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PRECAUTION
PRECAUTIONS
Precaution for Procedur
e without Cowl Top CoverINFOID:0000000006289506
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006417202
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 severi ty 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 whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.
WARNING:
• To avoid rendering the SRS inoper ative, which could increase the risk of personal injury or death in
the event of a collision that would result in air ba g 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 unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the “SRS AIR BAG”.
 Do not use electrical test equipm ent on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied 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 Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the
ignition ON or engine running, DO NOT use air or electric 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 minutes before performing any service.
Precaution Necessary for Steering Wh eel Rotation after Battery Disconnect
INFOID:0000000006289508
NOTE:
 Before removing and installing any control units, first tu rn the push-button ignition switch to the LOCK posi-
tion, then disconnect both battery cables.
 After finishing work, confirm that all control unit connectors are connected properly, then re-connect both
battery cables.
 Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If a DTC is detected, perform trouble diagnos is according to self-diagnosis results.
For vehicle with steering lock unit, if the battery is disconnected or discharged, the steering wheel will lock and
cannot be turned.
PIIB3706J
Revision: 2010 May2011 QX56

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTINGEM-19
< SYMPTOM DIAGNOSIS >
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Use the Chart Below to Help You Find the Cause of the SymptomINFOID:0000000006289523
1. Locate the area where noise occurs.
2. Confirm the type of noise.
3. Specify the operating condition of the engine.
4. Check specified noise source.
If necessary, repair or replace these parts.
A: Closely related B: Related C: Sometimes related —: Not related Location
of noise Type of
noise Operating condition of engine
Source of noise Check item Refer-
ence page
Before
warm- up After
warm- up When
start- ing When
idling When
racing While
driving
Top of en-
gine
Rocker
cover
Cylinder
head Ticking or
clicking
CA—AB— Tappet
noiseValve clearance
EM-12
Rattle C A — A B C Camshaft
bearing
noiseCamshaft runout
Camshaft journal oil
clearance
EM-77
Crank-
shaft pul-
ley
Cylinder
block
(Side of
engine)
Oil panSlap or
knock
—A—B B—
Piston pin
noisePiston to piston pin oil
clearance
Connecting rod bushing
oil clearance
EM-115
Slap or
rap
A——B B A
Piston
slap noisePiston to cylinder bore
clearance
Piston ring side clear-
ance
Piston ring end gap
Connecting rod bend
and torsion
EM-115
Knock A B C B B B
Connect-
ing rod
bearing
noiseConnecting rod bushing
oil clearance
Connecting rod bearing
oil clearance
EM-115
Knock A B — A B C
Main bear-
ing noiseMain bearing oil clear-
ance
Crankshaft runout
EM-115
Front of
engine
Timing
chain caseTapping or
ticking
AA—BBB Timing
chain and
timing
chain ten-
sioner
noiseTiming chain cracks
and wears
Timing chain tensioner
operation
EM-72
Front of
engineSqueak-
ing or fizz-
ing
AB—B—C Drive belts
(Sticking
or slip-
ping)Drive belts deflection
EM-20
CreakingABABAB Drive belts
(Slipping)Idler pulley bearing op-
eration
Squall
Creak AB—BAB Water
pump
noiseWater pump operation
CO-19
Revision: 2010 May2011 QX56

EM-20
< PERIODIC MAINTENANCE >
DRIVE BELTS
PERIODIC MAINTENANCE
DRIVE BELTS
Exploded ViewINFOID:0000000006289524
CheckingINFOID:0000000006289525
WARNING:
Be sure to perform the these steps when engine is stopped.
 Check that the indicator (C) (notch on fixed side) of each auto-tensioner is within the possible use range (A).
NOTE:
 Check the each auto-tensioners indication when the engine is cold.
 When new drive belts is installed, the indicator (notch on fixed side) should be within the range (B) in the\
figure.
 Visually check all drive belts for wear, damage or cracks.
 If the indicator (notch on fixed side) is out of the possible use range or drive belts are damaged, replace drive
belts.
Tension AdjustmentINFOID:0000000006289526
Refer to EM-132, "Drive Belts".
Removal and InstallationINFOID:0000000006289527
REMOVAL
1. Move reservoir tank to the position without the hindrance for work. Refer to CO-13, "Exploded View".
1. Drive belt 2. Power steering oil pump pulley 3. Alternator pulley
4. Crankshaft pulley 5. A/C compressor 6. Idler pulley
7. Cooling fan pulley 8. Water pump pulley 9. Drive belt auto-tensioner
A. Possible use range B. Range when new drive belt is in-
stalledC. Indicator
D. View D
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Revision: 2010 May2011 QX56

DRIVE BELTSEM-21
< PERIODIC MAINTENANCE >
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2. Install wrench (A) on drive belt auto tensioner pulley bolt, move
in the direction of arrow (loosening direction of tensioner) as
shown.
CAUTION:
 Never place hand in a location where pinching may occurif the holding tool accidentally comes off.
 Never loosen the hexagonal part in center of auto ten- sioner pulley (1) (Never turn it clockwise). If turned clock-
wise, the complete auto tensioner must be replaced as a
unit, including the pulley.
3. Under the above condition, insert a metallic bar (B) of approxi- mately 6 mm (0.24 in) in diameter (hexagonal bar wrench shown
as example in the figure) through the holding boss to lock auto tensioner pulley arm.
4. Remove drive belt.
INSTALLATION
Note the following item, and install in the reverse order of removal.
CAUTION:
 Check drive belts are securely installed around all pulleys.
 Check drive belts are correctly engaged with the pulley groove.
 Check for engine oil and engine coolant ar e not adhered drive belts and pulley groove.
InspectionINFOID:0000000006289528
INSPECTION AFTER INSTALLATION
 Turn crankshaft pulley clockwise several times to equalize tension between each pulley, and then confirm
tension of drive belts at indicator (notch on fixed side) is within the possible use range. Refer to EM-20,
"Exploded View".
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Revision: 2010 May2011 QX56

EM-26
< REMOVAL AND INSTALLATION >
DRIVE BELT AUTO TENSIONER AND IDLER PULLEY
DRIVE BELT AUTO TENSI ONER AND IDLER PULLEY
Exploded ViewINFOID:0000000006289536
Removal and InstallationINFOID:0000000006289537
Removal
CAUTION:
The complete drive belt auto-tensioner must be replaced as a unit, including the pulley.
1. Remove drive belts. Refer to EM-20, "
Exploded View".
 Keep auto-tensioner pulley arm locked after drive belt is removed.
2. Remove drive belt auto-tensioner.  Keep auto-tensioner pulley arm locked to install or remove auto-tensioner.CAUTION:
Never loosen the hexagonal part in center of dri ve belt auto tensioner pulley (Never turn it clock-
wise). If turned clockwise, the complete drive belt auto tensioner must be replaced as a unit,
including the pulley.
3. Remove idler pulley.
Installation
Installation is the reverse order of removal.
CAUTION:
Never swap the pulley between new an d old drive belt auto tensioner.
1. Drive belt auto-tensioner 2. Idler pulley 3. Fan bracket
Refer to GI-4, "
Components" for symbols in the figure.
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Revision: 2010 May2011 QX56

INTAKE MANIFOLDEM-31
< REMOVAL AND INSTALLATION >
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 Never spill engine coolant on drive belts.
NOTE:
When removing only intake manifold, move electric
throttle control actuator without disconnecting the
water hoses.
7. Remove electric throttle control actuator.  Loosen mounting bolts in reverse order as shown in the figure.
NOTE:
The figure shows the electric throttle control actuator viewed
from the air duct side.
CAUTION:
 Handle carefully to avoid an y impact to electric throttle
control actuator.
 Never disassemble.
8. Remove intake manifold, using a power tool.  Loosen mounting bolts in reverse order as shown in the figure.
9. Remove intake manifold gaskets. CAUTION:
Cover engine openings to avoid entry of foreign materials.
10. Remove manifold absolute pressure (MAP) sensor, if necessary. CAUTION:
Handle carefully to avoid any impact to manifold absolute pressure (MAP) sensor.
INSTALLATION
Note the following item, and install in the reverse order of removal.
Intake Manifold
Tighten in numerical order as shown in the figure.
Electric Throttle Control Actuator
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: Engine front
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: Engine front
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Revision: 2010 May2011 QX56

EM-40
< REMOVAL AND INSTALLATION >
EXHAUST MANIFOLD AND THREE WAY CATALYST
EXHAUST MANIFOLD AND THREE WAY CATALYST
Exploded ViewINFOID:0000000006289550
Removal and InstallationINFOID:0000000006289551
REMOVAL
WARNING:
Perform the work when the exhaust and cooling system have cooled sufficiently.
1. Drain engine coolant from radiator. Refer to CO-8, "
Draining".
CAUTION:
 Perform this step when the engine is cold.
 Never spill engine coolant on drive belt.
2. Remove reservoir tank. Refer to CO-13, "
Exploded View".
3. Remove drive belt. Refer to EM-20, "
Removal and Installation".
4. Remove power steering oil pump. Refer to ST-48, "
Exploded View".
5. Remove radiator. Refer to CO-13, "
Exploded View".
6. Remove front under cover. Refer to EXT-25, "
Exploded View".
7. Remove front wheels and tires. Refer to WT-64, "
Exploded View".
8. Remove A/C compressor. Refer to HA-30, "
Exploded View".
9. Remove alternator and alternator bracket. Refer to CHG-25, "
Exploded View".
10. Remove exhaust front tube (bank 1 and bank 2). Refer to EX-5, "
Exploded View".
1. Air fuel ratio sensor 1 (bank 2) 2. Exhaust manifold cover (bank 2) 3. Exhaust manifold and three way cat-
alyst (bank 2)
4. Gasket 5. Exhaust manifold and three way cat-
alyst (bank 1)6. Exhaust manifold cover (bank 1)
7. Air fuel ratio sensor 1 (bank 1)
Refer to GI-4, "
Components" for symbols in the figure.
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Revision: 2010 May2011 QX56