2006 INFINITI QX56 belt

EI-36
BODY SIDE TRIM
Revision: November 20092006 QX56
Installation
Installation is in the reverse order of removal.
CENTER PILLAR LOWER FINISHER
Removal
1. Remove front and rear door welts.
2. Remove seat belt anchor. Refer to SB-3, "
Removal and Installation of Front Seat Belt" .

On RH side, disconnect seat belt tension sensor.
3. Remove front and rear kicking plates. Refer to EI-36, "
KICKING PLATES" .
4. Remove center pillar lower finisher.
Installation
Installation is in the reverse order of removal.
CENTER PILLAR UPPER FINISHER
Removal
1. Remove center pillar lower finisher. Refer to EI-36, "CENTER PILLAR LOWER FINISHER" .
2. Remove assist grip.
3. Remove center pillar upper finisher.
Installation
Installation is in the reverse order of removal.
FRONT PILLAR FINISHER
Removal
1. Remove assist grip.
2. Remove front pillar finisher.
Installation
Installation is in the reverse order of removal.
KICKING PLATES
Removal and Installation
Release clips and remove front and/or rear kicking plates.
Installation
Installation is in the reverse order of removal.
MUDGUARD FINISHERS
Removal
Release clips and remove front and/or rear mudguard finishers.
Installation
Installation is in the reverse order of removal.
DOOR PARTING SEALS
Removal
1. Open front and/or rear doors fully.
2. Release clips and remove parting seals.
Installation is in the reverse order of removal.

FLOOR TRIMEI-37
C
DE
F
G H
J
K L
M A
B
EI
Revision: November 2009 2006 QX56
FLOOR TRIMPFP:74902
Removal and InstallationEIS004WS
REMOVAL
1. Remove front seats. Refer to SE-91, "FRONT SEAT" .

Remove subwoofer. Refer to AV- 5 9 , "SUBWOOFER" .

Remove navigation display control unit. Refer to AV- 1 6 7 , "DISPLAY CONTROL UNIT" .
2. Remove second row seats. Refer to SE-98, "
Second Row Outboard" and SE-98, "Second Row Center" ,
if equipped.
3. Remove third row rear seats. Refer to SE-105, "
THIRD SEAT" .
4. Remove lower seat belt anchors. Refer to SB-3, "
SEAT BELTS" .
5. Remove lower body side trim. Refer to EI-35, "
BODY SIDE TRIM" .
6. Remove luggage lower side finishers (left / right). Refer to EI-40, "
LUGGAGE FLOOR TRIM" .
7. Remove kicking plates. Refer to EI-35, "
BODY SIDE TRIM" .
8. Remove center console. Refer to IP-10, "
INSTRUMENT PANEL ASSEMBLY" .
9. Remove rear console, if equipped. Refer to IP-19, "
DISASSEMBLY AND ASSEMBLY" .
10. Remove rear lower finisher. Refer to EI-40, "
LUGGAGE FLOOR TRIM" .
11. Remove carpet.
12. Remove floor mat hook from front carpet.
INSTALLATION
Installation is in the reverse order of removal.
1. Carpet 2. Floor mat hook
WIIA0968E

LUGGAGE FLOOR TRIMEI-41
C
DE
F
G H
J
K L
M A
B
EI
Revision: November 2009 2006 QX56
REMOVAL
1. Remove 2nd and 3rd row seat belts. Refer to SB-3, "SEAT BELTS" .
2. Remove third row seat belt buckles.
3. Remove third row seat assembly. Refer to SE-105, "
THIRD SEAT" .
4. Remove back door weatherstrip. Refer to EI-42, "
BACK DOOR TRIM" .
5. Remove rear luggage room lamp. Refer to EI-38, "
HEADLINING" .

Disconnect harness from lamp.
6. Remove rear upper finisher. Refer to EI-38, "
HEADLINING" .
7. Remove rear door kicking plates. Refer to EI-35, "
BODY SIDE TRIM" .
8. Remove rear lower finisher.
9. Disconnect door open/close link. Refer to BL-135, "
BACK DOOR LOCK" .
10. Remove cargo net hooks.
11. Remove luggage side lower finishers LH/RH.

Disconnect power point, RH side.
12. Remove coat hooks.
13. Remove luggage side upper finishers LH/RH.

Disconnect harness to door open/close switch, LH side.
14. Remove tie down hooks LH/RH.
15. Remove floor side finishers LH/RH.
16. Remove luggage floor board.
17. Remove storage box.
18. Remove front luggage floor bracket.
19. Remove rear luggage box bracket.
INSTALLATION
Installation is in the reverse order of removal.
1. Rear lower finisher cap 2. Rear lower finisher3. Cap upper seat belt finisher RH
4. Luggage side finisher RH 5. Metal clip6. Plastic clip
7. Luggage side finisher lower RH 8. Luggage floor board 9. Latch luggage floor board
10. Leak check cap 11. Cup holder12. Tie down hook
13. Floor side finisher RH 14. Power point assembly 15. Cargo net hook
16. Rear luggage box bracket 17. Front luggage floor bracket 18. Storage box
19. Floor side finisher LH 20. Luggage side finisher upper LH 21. Luggage side finisher lower LH
22. Lid luggage side lower 23. Coat hook24. Cap lower seat belt finisher
25. Back door open/close switch 26. Cap luggage side upper 27. Cap upper seat belt finisher LH

EM-1
ENGINE MECHANICAL
B ENGINE
CONTENTS
C
DE
F
G H
I
J
K L
M
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
C
DE
F
G H
I
J
K L
M A
EM
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.

PREPARATIONEM-7
C
DE
F
G H
I
J
K L
M A
EM
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

NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTINGEM-11
C
DE
F
G H
I
J
K L
M A
EM
Revision: November 2009 2006 QX56
Use the Chart Below to Help You Find the Cause of the Symptom.EBS00RET
1. Locate the area where noise occurs.
2. Confirm the type of noise.
3. Specify the operating condition of 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
driv- ing
Top of
engine
Rocker
cover
Cylinder
head Ticking or
clicking
CA
—AB —Tappet noise Valve clearance EM-69
Rattle C A—ABC Camshaft
bearing noiseCamshaft journal clear-
ance
Camshaft runout EM-50EM-50
Crankshaft
pulley
Cylinder
block (Side
of engine)
Oil panSlap or
knock
—
A— BB —Piston pin
noise Piston and piston pin
clearance
Connecting rod bush-
ing clearance EM-95
EM-97
Slap or
rap
A
—— BBA Piston slap
noisePiston-to-bore clear-
ance
Piston ring side clear-
ance
Piston ring end gap
Connecting rod bend
and torsion EM-99EM-95
EM-95
EM-96
Knock A B C B B B
Connecting
rod bearing
noiseConnecting rod bush-
ing oil clearance (Small
end)
Connecting rod bear-
ing clearance (Big end)
EM-97EM-96
Knock A B
—ABC Main bearing
noiseMain bearing oil clear-
ance
Crankshaft runout EM-101EM-100
Front of
engine
Chain case
cover
Front coverTapping
or ticking
AA
—BBB Timing chain
and chain
tensioner
noiseTiming chain cracks
and wear
Timing chain tensioner
operation
EM-40
EM-37
Front of
engineSqueak-
ing or
fizzing
AB
—B— CDrive belts
(Sticking or
slipping) Drive belts deflection
EM-13
Creaking A B A B A B Drive belts
(Slipping)Idler pulley bearing
operation
Squall
Creaking AB
—BAB Water pump
noiseWater pump operation CO-19,
"INSPEC-
TION
AFTER
REMOVA
L"