INFINITI QX56 2006 Factory Service Manual

EI-42
BACK DOOR TRIM
Revision: November 20092006 QX56
BACK DOOR TRIMPFP:90900
Removal and InstallationEIS004WV
REMOVAL
1. Disconnect door open/close link. Refer to BL-135, "BACK DOOR LOCK" .
2. Open back door glass.
3. Remove inside weatherstrip around back door glass.
4. Remove assist handle.
5. Release clips and remove back door lower finisher.
6. Release clips and remove back door upper finisher.
7. Release clips and remove back door side finishers LH and RH.
Installation is in the reverse order of removal.
1. Back door upper finisher 2. Back door glass weatherstrip 3. Back door side finisher RH
4. Back door lower finisher 5. Back door bumper 6. Back door pull handle
7. Back door mask 8. Back door side finisher LH
WIIA0971E

EM-1
ENGINE MECHANICAL
B ENGINE
CONTENTS
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SECTION
A
EM
Revision: November 2009 2006 QX56
PRECAUTIONS .....................................................
..... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ............................................................. ..... 3
Precautions for Drain Engine Coolant ................. ..... 3
Precautions for Disconnecting Fuel Piping ......... ..... 3
Precautions for Removal and Disassembly ........ ..... 3
Precautions for Inspection, Repair and Replace-
ment .................................................................... ..... 3
Precautions for Assembly and Installation .......... ..... 3
Parts Requiring Angular Tightening .................... ..... 4
Precautions for Liquid Gasket ............................. ..... 4
REMOVAL OF LIQUID GASKET SEALING ..... ..... 4
LIQUID GASKET APPLICATION PROCEDURE ..... 4
PREPARATION ...................................................... ..... 6
Special Service Tools .......................................... ..... 6
Commercial Service Tools ................................... ..... 8
NOISE, VIBRATION, AND HARSHNESS (NVH)
TROUBLESHOOTING ........................................... ... 10
NVH Troubleshooting —Engine Noise ................ ... 10
Use the Chart Below to Help You Find the Cause
of the Symptom. .................................................. .... 11
ENGINE ROOM COVER ....................................... ... 12
Removal and Installation ..................................... ... 12
REMOVAL ........................................................ ... 12
INSTALLATION ................................................ ... 12
DRIVE BELTS ........................................................ ... 13
Checking Drive Belts ........................................... ... 13
DRIVE BELT TENSION ................................... ... 13
Removal and Installation ..................................... ... 13
REMOVAL ........................................................ ... 13
INSTALLATION ................................................ ... 14
Drive Belt Auto Tensioner and Idler Pulley .......... ... 14
REMOVAL ........................................................ ... 14
INSTALLATION ................................................ ... 14
AIR CLEANER AND AIR DUCT ............................ ... 15
Removal and Installation ..................................... ... 15
REMOVAL ........................................................ ... 15INSTALLATION ................................................
... 15
Removal and Installation (Viscous paper type) ... ... 16
REMOVAL ........................................................ ... 16
INSTALLATION ................................................ ... 16
INTAKE MANIFOLD .............................................. ... 17
Removal and Installation ..................................... ... 17
REMOVAL ........................................................ ... 17
INSTALLATION ................................................ ... 19
INSPECTION AFTER INSTALLATION ............. ... 20
EXHAUST MANIFOLD AND THREE WAY CATA-
LYST ....................................................................... ... 21
Removal and Installation ..................................... ... 21
REMOVAL ........................................................ ... 21
INSPECTION AFTER REMOVAL .................... ... 22
INSTALLATION ................................................ ... 22
OIL PAN AND OIL STRAINER .............................. ... 24
Removal and Installation ..................................... ... 24
REMOVAL ........................................................ ... 24
INSPECTION AFTER REMOVAL .................... ... 25
INSTALLATION ................................................ ... 26
INSPECTION AFTER INSTALLATION ............. ... 27
IGNITION COIL ...................................................... ... 28
Removal and Installation ..................................... ... 28
REMOVAL ........................................................ ... 28
INSTALLATION ................................................ ... 28
SPARK PLUG (PLATINUM-TIPPED TYPE) .......... ... 29
Removal and Installation ..................................... ... 29
REMOVAL ........................................................ ... 29
INSPECTION AFTER REMOVAL .................... ... 29
INSTALLATION ................................................ ... 30
FUEL INJECTOR AND FUEL TUBE ..................... ... 31
Removal and Installation ..................................... ... 31
REMOVAL ........................................................ ... 31
INSTALLATION ................................................ ... 32
INSPECTION AFTER INSTALLATION ............. ... 34
ROCKER COVER .................................................. ... 35
Removal and Installation ..................................... ... 35
REMOVAL ........................................................ ... 35
INSTALLATION ................................................ ... 36

EM-2Revision: November 20092006 QX56
TIMING CHAIN .......................................................
... 37
Removal and Installation ..................................... ... 37
REMOVAL ........................................................ ... 38
INSPECTION AFTER REMOVAL ..................... ... 40
INSTALLATION ................................................. ... 41
CAMSHAFT ............................................................ ... 46
Removal and Installation ..................................... ... 46
REMOVAL ........................................................ ... 46
INSPECTION AFTER REMOVAL ..................... ... 50
INSTALLATION ................................................. ... 52
Valve Clearance ................................................... ... 55
INSPECTION .................................................... ... 55
ADJUSTMENT ................................................. ... 58
OIL SEAL ............................................................... ... 60
Removal and Installation of Valve Oil Seal .......... ... 60
REMOVAL ........................................................ ... 60
INSTALLATION ................................................. ... 60
Removal and Installation of Front Oil Seal .......... ... 61
REMOVAL ........................................................ ... 61
INSTALLATION ................................................. ... 61
Removal and Installation of Rear Oil Seal ........... ... 61
REMOVAL ........................................................ ... 61
INSTALLATION ................................................. ... 62
CYLINDER HEAD .................................................. ... 63
On-Vehicle Service .............................................. ... 63
CHECKING COMPRESSION PRESSURE ......... 63
Removal and Installation ..................................... ... 64
REMOVAL ........................................................ ... 64
INSPECTION AFTER REMOVAL ..................... ... 65
INSTALLATION ................................................. ... 65
Disassembly and Assembly ................................. ... 66
DISASSEMBLY ................................................ ... 66
ASSEMBLY ...................................................... ... 67
Inspection After Disassembly .............................. ... 68
CYLINDER HEAD DISTORTION ..................... ... 68
VALVE DIMENSIONS ....................................... ... 69
VALVE GUIDE CLEARANCE ........................... ... 69
VALVE GUIDE REPLACEMENT ...................... ... 70
VALVE SEAT CONTACT .................................. ... 71
VALVE SEAT REPLACEMENT ........................ ... 71
VALVE SPRING SQUARENESS ...................... ... 73
VALVE SPRING DIMENSIONS AND VALVE
SPRING PRESSURE LOAD ............................ ... 73
ENGINE ASSEMBLY ................................................ 74 Removal and Installation ..................................... ... 74
REMOVAL ........................................................ ... 74
INSTALLATION ................................................. ... 76
INSPECTION AFTER INSTALLATION ............. ... 76CYLINDER BLOCK ................................................
... 78
Disassembly and Assembly ................................. ... 78
DISASSEMBLY ................................................. ... 79
ASSEMBLY ....................................................... ... 82
How to Select Piston and Bearing ....................... ... 87
DESCRIPTION ................................................. ... 87
HOW TO SELECT PISTON .............................. ... 87
HOW TO SELECT CONNECTING ROD BEAR-
ING .................................................................... ... 88
HOW TO SELECT MAIN BEARING ................. ... 90
Inspection After Disassembly ............................... ... 94
CRANKSHAFT END PLAY ............................... ... 94
CONNECTING ROD SIDE CLEARANCE ........ ... 94
PISTON AND PISTON PIN CLEARANCE ........ ... 94
PISTON RING SIDE CLEARANCE .................. ... 95
PISTON RING END GAP ................................. ... 95
CONNECTING ROD BEND AND TORSION .... ... 96
CONNECTING ROD BEARING (BIG END) ..... ... 96
CONNECTING ROD BUSHING OIL CLEAR-
ANCE (SMALL END) ........................................ ... 96
CYLINDER BLOCK DISTORTION ................... ... 97
MAIN BEARING HOUSING INSIDE DIAMETER ... 98
PISTON TO CYLINDER BORE CLEARANCE . ... 98
CRANKSHAFT JOURNAL DIAMETER ............ ... 99
CRANKSHAFT PIN DIAMETER ....................... .100
OUT-OF-ROUND AND TAPER OF CRANK-
SHAFT .............................................................. .100
CRANKSHAFT RUNOUT ................................. .100
CONNECTING ROD BEARING OIL CLEAR-
ANCE ................................................................ .100
MAIN BEARING OIL CLEARANCE .................. .101
CRUSH HEIGHT OF MAIN BEARING ............. .102
CRUSH HEIGHT OF CONNECTING ROD
BEARING .......................................................... .102
MAIN BEARING CAP BOLT DIAMETER .......... .102
CONNECTING ROD BOLT DIAMETER ........... .103
SERVICE DATA AND SPECIFICATIONS (SDS) ... .104
Standard and Limit ............................................... .104
GENERAL SPECIFICATIONS .......................... .104
DRIVE BELTS ................................................... .104
EXHAUST MANIFOLD ..................................... .104
CAMSHAFT AND CAMSHAFT BEARING ........ .105
CYLINDER HEAD ............................................. .107
CYLINDER BLOCK ........................................... .109
PISTON, PISTON RING AND PISTON PIN ..... .110
CONNECTING ROD ......................................... .110
CRANKSHAFT .................................................. . 111
MAIN BEARING ................................................ .112

PRECAUTIONSEM-3
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Revision: November 2009 2006 QX56
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EBS00REI
The Supplemental Restraint System such as “AIR 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 whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:

To avoid rendering the SRS inoperative, 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 per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions for Drain Engine CoolantEBS00REJ
Drain engine coolant when engine is cooled.
Precautions for Disconnecting Fuel PipingEBS00REK

Before starting work, make sure no fire or spark producing items are in the work area.

Release fuel pressure before disconnecting and disassembly.

After disconnecting pipes, plug openings to stop fuel leakage.
Precautions for Removal and DisassemblyEBS00REL

When instructed to use special service tools, use the specified tools. Always be careful to work safely,
avoid forceful or uninstructed operations.

Exercise maximum care to avoid damage to mating or sliding surfaces.

Cover openings of engine system with tape or the equivalent, if necessary, to seal out foreign materials.

Mark and arrange disassembly parts in an organized way for easy troubleshooting and assembly.

When loosening nuts and bolts, as a basic rule, start with the one furthest outside, then the one diagonally
opposite, and so on. If the order of loosening is specified, do exactly as specified. Power tools may be
used where noted in the step.
Precautions for Inspection, Repair and ReplacementEBS00REM
Before repairing or replacing, thoroughly inspect parts. Inspect new replacement parts in the same way, and
replace if necessary.
Precautions for Assembly and InstallationEBS00REN

Use torque wrench to tighten bolts or nuts to specification.

When tightening nuts and bolts, as a basic rule, equally tighten in several different steps starting with the
ones in center, then ones on inside and outside diagonally in this order. If the order of tightening is speci-
fied, do exactly as specified.

Replace with new gasket, packing, oil seal or O-ring.

Thoroughly wash, clean, and air-blow each part. Carefully check engine oil or engine coolant passages for
any restriction and blockage.

Avoid damaging sliding or mating surfaces. Completely remove foreign materials such as cloth lint or dust.
Before assembly, oil sliding surfaces well.

Release air within route when refilling after draining engine coolant.

EM-4Revision: November 2009
PRECAUTIONS
2006 QX56

Before starting engine, apply fuel pressure to fuel lines with turning ignition switch ON (with engine
stopped). Then make sure that there are no leaks at fuel line connections.

After repairing, start engine and increase engine speed to check engine coolant, fuel, oil, and exhaust
systems for leakage.
Parts Requiring Angular TighteningEBS00REO

For final tightening of the following engine parts use Tool:
–Cylinder head bolts
–Main bearing cap bolts
–Connecting rod cap bolts
–Crankshaft pulley bolt (No angle wrench is required as the bolt flange is provided with notches for angle
tightening)

Do not use a torque value for final tightening.

The torque value for these parts are for a preliminary step.

Ensure thread and seat surfaces are clean and lightly coated with engine oil.
Precautions for Liquid GasketEBS00REP
REMOVAL OF LIQUID GASKET SEALING

After removing the bolts and nuts, separate the mating surface
and remove the old liquid gasket sealing using Tool.
CAUTION:
Do not damage the mating surfaces.

Tap the seal cutter to insert it.

In areas where the Tool is difficult to use, lightly tap to slide it.
LIQUID GASKET APPLICATION PROCEDURE
1. Remove the old liquid gasket adhering to the gasket applicationsurface and the mating surface using suitable tool.

Remove the liquid gasket completely from the groove of the
liquid gasket application surface, bolts, and bolt holes.
2. Thoroughly clean the mating surfaces and remove adhering moisture, grease and foreign material.
3. Attach the liquid gasket tube to the Tool. Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-46, "
Recommended Chemical Products and Sealants" .
4. Apply the liquid gasket without breaks to the specified location with the specified dimensions.Tool number : KV10112100 (BT-8653-A)
Tool number : KV10111100 (J-37228)
WBIA0566E
PBIC0003E
Tool number : WS39930000 ( — )
WBIA0567E

PRECAUTIONSEM-5
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Revision: November 2009 2006 QX56

If there is a groove for the liquid gasket application, apply the
liquid gasket to the groove.

As for the bolt holes, normally apply the liquid gasket inside
the holes. If specified in the procedure, it should also be
applied outside the holes.

Within five minutes of liquid gasket application, install the mat-
ing component.

If the liquid gasket protrudes, wipe it off immediately.

Do not retighten after the installation.

Wait 30 minutes or more after installation before refilling the
engine with engine oil and engine coolant.
CAUTION:
If there are specific instructions in this manual, observe them.SEM159F

EM-6Revision: November 2009
PREPARATION
2006 QX56
PREPARATIONPFP:00002
Special Service ToolsEBS00REQ
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.Tool number
(Kent-Moore No.)
Tool name Description
KV10111100
(J-37228)
Seal cutter Removing steel oil pan and rear timing chain
case
—
(J-44626)
Air fuel sensor Socket Loosening or tightening air fuel ratio A/F sen-
sor
a: 22 mm (0.87 in)
EG15050500
(J-45402)
Compression gauge adapter Inspecting compression pressure
KV10116200
(J-26336-A)
Valve spring compressor
1. KV10115900
(J-26336-20)
Attachment
2. KV10109220
( — )
Adapter Disassembling valve mechanism
Part (1) is a component of KV10116200 (J-
26336-A), but part (2) is not.
KV10112100
(BT-8653-A)
Angle wrench Tightening bolts for cylinder head, main bear-
ing cap and connecting rod cap
KV10107902
(J-38959)
Valve oil seal puller Removing valve oil seal
S-NT046
LBIA0444E
ZZA1225D
PBIC1650E
S-NT014
S-NT011

PREPARATIONEM-7
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Revision: November 2009 2006 QX56
KV10115600
(J-38958)
Valve oil seal driftInstalling valve oil seal
Use side A.
a: 20 (0.79) dia. d: 8 (0.31) dia.
b: 13 (0.51) dia. e: 10.7 (0.421) dia.
c: 10.3 (0.406) dia. f: 5 (0.20) dia.
Unit: mm (in)
EM03470000
(J-8037)
Piston ring compressor Installing piston assembly into cylinder bore
ST16610001
(J-23907)
Pilot bushing puller Removing crankshaft pilot bushing
WS39930000
( — )
Tube presser Pressing the tube of liquid gasket
—
(J-45476)
Ring gear stopper Removing and installing crankshaft pulley
16441 6N210
(J-45488)
Quick connector release Removing fuel tube quick connectors in en-
gine room
(Available in SEC. 164 of PARTS CATALOG:
Part No. 16441 6N210)
—
(J-46535)
Drive belt tension releaser Releasing drive belt tension
Tool number
(Kent-Moore No.)
Tool name
Description
S-NT603
S-NT044
S-NT045
S-NT052
PBIC1655E
PBIC0198E
WBIA0536E

EM-8Revision: November 2009
PREPARATION
2006 QX56
Commercial Service ToolsEBS00RER
(Kent-Moore No.)
Tool nameDescription
Power tool Loosening bolts and nuts
Spark plug wrench Removing and installing spark plug
(J-24239-01)
Cylinder head bolt wrench Loosening and tightening cylinder head bolt,
and use with angle wrench [SST:
KV10112100 (BT-8653-A)]
a: 13 (0.51) dia.
b: 12 (0.47)
c: 10 (0.39)
Unit: mm (in)
Valve seat cutter set Finishing valve seat dimensions
Pulley puller Removing crankshaft pulley
Piston ring expander Removing and installing piston ring
Valve guide drift Removing and installing valve guide
Intake & Exhaust:
a: 9.5 mm (0.374 in) dia.
b: 5.5 mm (0.217 in) dia.
PBIC0190E
S-NT047
NT583
S-NT048
ZZA0010D
S-NT030
S-NT015

PREPARATIONEM-9
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Revision: November 2009 2006 QX56
Valve guide reamer1: Reaming valve guide hole
2: Reaming hole for oversize valve guide
Intake & Exhaust:
d
1 : 6.0 mm (0.236 in) dia.
d
2 : 10.175 - 10.196 mm (0.4006 - 0.4014 in)
dia.
Front oil seal drift Installing front oil seal
Rear oil seal drift Installing rear oil seal
(J-43897-18)
(J-43897-12)
Oxygen sensor thread cleaner Reconditioning the exhaust system threads
before installing a new A/F sensor and heated
oxygen sensor (Use with anti-seize lubricant
shown below.)
a: J-43897-18 (18 mm dia.) (0.71 in) for zir-
conia heated oxygen sensor
b: J-43897-12 (12 mm dia.) (0.55 in) for tita-
nia heated oxygen sensor
Anti-seize lubricant (Permatex 133AR
or equivalent meeting MIL specifica-
tion MIL-A-907) Lubricating A/F sensors and heated oxygen
sensor thread cleaning tool when recondition-
ing exhaust system threads
(Kent-Moore No.)
Tool name
Description
S-NT016
ZZA0012D
ZZA0025D
AEM488
AEM489