2006 INFINITI QX56 check oil

EC-628Revision: November 2009
IGNITION SIGNAL
2006 QX56
12. CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between ignition coil terminal 2 and ground. Refer to Wiring Diagram.
3. Also check harness for short to power.
OK or NG
OK >> GO TO 13.
NG >> Repair open circuit or short to power in harness or connectors.
13. CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminals 46, 60, 61, 62, 65, 79, 80, 81 and ignition coil terminal 1.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 14.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
14. CHECK IGNITION COIL WITH POWER TRANSISTOR
Refer to EC-628, "
Component Inspection" .
OK or NG
OK >> GO TO 15.
NG >> Replace ignition coil with power transistor.
15. CHECK INTERMITTENT INCIDENT
Refer to EC-144, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>> INSPECTION END
Component InspectionUBS00L1D
IGNITION COIL WITH POWER TRANSISTOR
CAUTION:
Do the following procedure in the place where ventilation is good without the combustible.
1. Turn ignition switch OFF.
2. Disconnect ignition coil harness connector.
3. Check resistance between ignition coil terminals as follows.
4. If NG, replace ignition coil with power transistor.
If OK, go to next step.
5. Turn ignition switch OFF.
6. Reconnect all harness connectors disconnected. Continuity should exist.
Continuity should exist.
Terminal No. (Polarity)
Resistance Ω [at 25 °C (77 °F)]
1 and 2 Except 0 or \b
1 and 3 Except 0
2 and 3
PBIB0847E

IGNITION SIGNALEC-629
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7. Remove fuel pump fuse in fuse block No. 1 to release fuel pres-
sure.
NOTE:
Do not use CONSULT-II to release fuel pressure, or fuel pres-
sure applies again during the following procedure.
8. Start engine.
9. After engine stalls, crank it two or three times to release all fuel pressure.
10. Turn ignition switch OFF.
11. Remove all ignition coil harness connectors to avoid the electri- cal discharge from the ignition coils.
12. Remove ignition coil and spark plug of the cylinder to be checked.
13. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
14. Connect spark plug and harness connector to ignition coil.
15. Fix ignition coil using a rope etc. with gap of 13 - 17 mm between the edge of the spark plug and grounded metal portion
as shown in the figure.
16. Crank engine for about 3 seconds, and check whether spark is generated between the spark plug and the grounded metal por-
tion.
CAUTION:

Do not approach to the spark plug and the ignition coil
within 50cm. Be careful not to get an electrical shock
while checking, because the electrical discharge voltage
becomes 20kV or more.

It might cause to damage the ignition coil if the gap of more than 17 mm is taken.
NOTE:
When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.
17. If NG, replace ignition coil with power transistor.
CONDENSER-1
1. Turn ignition switch OFF.
2. Disconnect condenser-1 harness connector.
3. Check resistance between condenser-1 terminals 1 and 2.
Removal and InstallationUBS00L1E
IGNITION COIL WITH POWER TRANSISTOR
Refer to EM-28, "IGNITION COIL" .
Spark should be generated.
BBIA0380E
PBIB2325E
Resistance
Above 1 MΩ at 25 °C (77 °F)
PBIB0794E

EI-1
EXTERIOR & INTERIOR
I BODY
CONTENTS
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SECTION
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B
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Revision: November 2009 2006 QX56
PRECAUTIONS .....................................................
..... 3
Service Notice .......................................................... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ............................................................. ..... 3
PREPARATION ...................................................... ..... 4
Special Service Tools .......................................... ..... 4
Commercial Service Tools ................................... ..... 4
SQUEAK AND RATTLE TROUBLE DIAGNOSES ..... 5
Work Flow ................................................................ 5 CUSTOMER INTERVIEW ................................ ..... 5
DUPLICATE THE NOISE AND TEST DRIVE .. ..... 6
CHECK RELATED SERVICE BULLETINS ...... ..... 6
LOCATE THE NOISE AND IDENTIFY THE
ROOT CAUSE ................................................. ..... 6
REPAIR THE CAUSE ...................................... ..... 6
CONFIRM THE REPAIR .................................. ..... 7
Generic Squeak and Rattle Troubleshooting ...... ..... 7
INSTRUMENT PANEL ..................................... ..... 7
CENTER CONSOLE ........................................ ..... 7
DOORS ............................................................ ..... 7
TRUNK ............................................................. ..... 8
SUNROOF/HEADLINING ................................ ..... 8
OVERHEAD CONSOLE (FRONT AND REAR) ..... 8
SEATS .............................................................. ..... 8
UNDERHOOD .................................................. ..... 8
Diagnostic Worksheet ......................................... ..... 9
CLIP AND FASTENER .......................................... ....11
Description .......................................................... .... 11
FRONT BUMPER .................................................. ... 13
Removal and Installation ..................................... ... 13
REMOVAL ........................................................ ... 13
INSTALLATION ................................................ ... 14
REAR BUMPER .................................................... ... 15
Removal and Installation ..................................... ... 15
REMOVAL ........................................................ ... 16
INSTALLATION ................................................ ... 16FRONT GRILLE .....................................................
... 17
Removal and Installation ..................................... ... 17
REMOVAL ........................................................ ... 17
INSTALLATION ................................................ ... 17
COWL TOP ............................................................ ... 18
Removal and Installation ..................................... ... 18
REMOVAL ........................................................ ... 18
INSTALLATION ................................................ ... 19
FRONT FENDER ................................................... ... 20
Removal and Installation ..................................... ... 20
REMOVAL ........................................................ ... 20
INSTALLATION ................................................ ... 20
OVER FENDER ...................................................... ... 21
Removal and Installation ..................................... ... 21
REMOVAL ........................................................ ... 21
INSTALLATION ................................................ ... 21
FENDER PROTECTOR ......................................... ... 23
Removal and Installation ..................................... ... 23
REMOVAL ........................................................ ... 23
INSTALLATION ................................................ ... 23
LICENSE LAMP FINISHER ................................... ... 24
Removal and Installation ..................................... ... 24
REMOVAL ........................................................ ... 24
INSTALLATION ................................................ ... 24
RUNNING BOARDS .............................................. ... 25
Removal and Installation ..................................... ... 25
REMOVAL ........................................................ ... 25
INSTALLATION ................................................ ... 25
REAR SPOILER ..................................................... ... 26
Removal and Installation ..................................... ... 26
REMOVAL ........................................................ ... 26
INSTALLATION ................................................ ... 26
ROOF RACK .......................................................... ... 27
Removal and Installation ..................................... ... 27
REMOVAL ........................................................ ... 27
INSTALLATION ................................................ ... 27
DOOR OUTSIDE MOLDING .................................. ... 28
Removal and Installation ..................................... ... 28
......................................................................... ... 28
......................................................................... ... 29

EM-1
ENGINE MECHANICAL
B ENGINE
CONTENTS
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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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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

NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTINGEM-11
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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"