service INFINITI QX56 2011 Factory Service Manual

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

PREPARATIONEM-7
< PREPARATION >
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PREPARATION
PREPARATION
Special Service ToolINFOID:0000000006289518
Tool number
(Kent-Moore No.)
Tool name
Description
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
(J26336-A), but part (2) is not so.
KV10107902
(J-38959)
Valve oil seal puller Removing valve oil seal
KV10115600
(J-38958)
Valve oil seal drift Installing valve oil seal
Use side A (G)
a: 20 (0.79) dia. d: 8 (0.31) dia.
b: 13 (0.51) dia. e: 10.7 (0.421)
c: 10.3 (0.406) dia. f: 5 (0.20)
H: Side B
Unit: mm (in)
EM03470000
(J-8037)
Piston ring compressor Installing piston assembly into cylinder bore
K V 1 0 1111 0 0
(J-37228)
Seal cutter Removing steel oil pan and front cover
KV10112100
(BT8653-A)
Angle wrench Tightening bolts for bearing cap, cylinder
head, etc.
PBIC1650E
S-NT011
JPBIA0396ZZ
S-NT044
S-NT046
S-NT014
Revision: 2010 May2011 QX56

PREPARATIONEM-9
< PREPARATION >
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Commercial Service ToolINFOID:0000000006289519
KV101197S0
(—)
Injector seal drift set
Installing fuel injector seal ring
EG15050500
(J-45402)
Compression gauge adapter Checking compresion pressure
Tool number
(Kent-Moore No.)
Tool name
Description
JPBIA3281ZZ
ZZA1225D
(Kent-Moore No.)
Tool name
Description
(—)
Tube presser Pressing the tube of liquid gasket
(—)
Power tool Loosening nuts and bolts
(—)
Spark plug wrench Removing and installing spark plug
a: 14 mm (0.55 in)
(—)
Manual lift table caddy Removing and installing engine
S-NT052
PBIC0190E
JPBIA0399ZZ
ZZA1210D
Revision: 2010 May2011 QX56

EM-12
< BASIC INSPECTION >
CAMSHAFT VALVE CLEARANCE
BASIC INSPECTION
CAMSHAFT VALVE CLEARANCE
InspectionINFOID:0000000006289520
INSPECTION
Check valve clearance if applicable to the following cases:
Intake side:
 At the removal and installation of VVEL ladder assembly or valve-related parts, or at the occurrence of mal-
function (poor starting, idle malfunction, unusual noise) due to aged deterioration in valve clearance.
CAUTION:
Valve clearance check on the intake side is not required after replacing the VVEL ladder assembly &
cylinder head assembly with a new one. (Install new VVEL ladder assembly & cylinder head assembly
in factory-shipped condition because it is factory-adjusted and inspected.)
NOTE:
VVEL ladder assembly cannot be replaced as a singl e part, because it is machined together with cylinder
head assembly.
Exhaust side: At the removal, installation, and replacement of exhaus t camshaft or valve-related parts, or at the occur-
rence of malfunction (poor starting, idle malfunction, unusual noise) due to aged deterioration in valve clear-
ance.
1. Remove VVEL actuator motor assembly. Refer to EM-36, "
Removal and Installation".
2. Remove rocker covers (bank 1 and bank 2). Refer to EM-33, "
Removal and Installation".
3. Remove VVEL actuator housing assembly. Refer to EM-36, "
Removal and Installation".
4. Measure the valve clearance as per the following:  Use the feeler gauge (commercial service tool) of cu rved-tip. This allows the feeler gauge to access the
clearance between camshaft (drive shaft) nose and valve lifter with ease.
NOTE:
Be sure to note the following points when measuring valve clearance on the intake side.
 Before measuring, check that the position of drive shaft nose
is within the angle shown in the figure.
 Refer to the figure for the insertion direction of the feeler gauge since the direction depends on the bank.Valve clearance : Refer to
EM-133, "
Camshaft".
A: Bank 2
B : Feeler gauge (commercial service tool)
c : 45 degrees (drive shaft nose angle)
D: View D
: Insertion direction of feeler gauge on the bank 2
: Insertion direction of feeler gauge on the bank 1
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EM-14
< BASIC INSPECTION >
CAMSHAFT VALVE CLEARANCE
To measure valve clearance of No. 1 cylinder INT valve (front
side), insert feeler gauge (A) (commercial service tool) as shown
in the figure.
b. Rotate crankshaft 270 degrees clockwise (when viewed from engine front) to align No. 3 cylinder at TDC its compression stroke.
NOTE:
Crankshaft pulley mounting bolt flange has an angle mark (B)
every 90 degrees (c). They can be used as a guide to rotation
angle.
 By referring to the figure, measure the valve clearances atlocations marked “ ×” as shown in the table below (locations
indicated in the figure).
 No. 3 cylinder at compression TDC
c. Rotate crankshaft 90 degrees clockwise (when viewed from engine front) to align No. 6 cylinder at TDC of compression stroke.
NOTE:
: Engine front
JPBIA3489ZZ
A : Paint mark
JPBIA2066ZZ
: Engine front
Measuring position [bank 2 (A)] No. 2
CYL. No. 4
CYL. No. 6
CYL. No. 8
CYL.
No. 3 cylinder at com- pression TDC EXH
× (C)
INT × (D)
Measuring position [bank 1 (B)] No. 1
CYL. No. 3
CYL. No. 5
CYL. No. 7
CYL.
No. 3 cylinder at com- pression TDC INT
× (E) × (F)
EXH × (G) × (H)
JPBIA3490ZZ
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EM-16
< BASIC INSPECTION >
COMPRESSION PRESSURE
COMPRESSION PRESSURE
InspectionINFOID:0000000006289521
1. Warm up engine thoroughly. Then, stop it.
2. Release fuel pressure. Refer to EC-153, "
Work Procedure".
CAUTION:
If CONSULT-III is not used to release fuel pr essure leave the fuel pump fuse disconnected until
step 7.
3. Remove fuel pump fuse in IPDM E/R. NOTE:
 For the fuse number, refer to EC-114, "
Wiring Diagram".
 For the fuse arrangement, refer to PG-143, "
Fuse, Connector and Terminal Arrangement".
4. Remove engine cover. Refer to EM-25, "
Exploded View".
5. Remove ignition coil and spark plug from each cylinder. Refer to EM-29, "
Exploded View".
6. Connect engine tachometer (not required in use of CONSULT-III).
7. Install the compression tester with Tool [SST: EG15050500 (J- 45402)] into the spark plug hole.
8. Measure compression pressure using compressi on gauge connected with flexible type adapter (commer-
cial service tool).
9. With accelerator pedal fully depressed, turn ignition switch to “START” for cranking. When the gauge pointer stabilizes, read the compression pressure and the engine rpm. Perform these steps to check each
cylinder.
CAUTION:
 Measure a six-cylinder under the same conditio ns since a measurement depends on measure-
ment conditions (engine water temperature, etc.).
 Always use a fully changed battery to obtain the specified engine speed.
 If the engine speed is out of the specified range, c heck battery liquid for proper gravity. Check the
engine speed again with normal battery gravity. Refer to PG-159, "
How to Handle Battery".
 If compression pressure is below the minimum value, check valve clearances and parts associated with combustion chamber (valve, valve seat, piston, pi ston ring, cylinder bore, cylinder head, cylinder head
gasket). After checking, measure compression pressure again.
 If a cylinder has low compression pressure, pour a small amount of engine oil into the spark plug hole of the cylinder to re-check it for compression.
- If the added engine oil improves the compression, pi ston rings may be worn out or damaged. Check pis-
ton rings and replace if necessary. Refer to EM-107, "
Disassembly and Assembly".
- If the compression pressure remains at low level despite the addition of engine oil, valves may be mal- functioning. Check valves for damage. Replace valve or valve seat accordingly. Refer to EM-107, "
Dis-
assembly and Assembly".
 If two adjacent cylinders have respectively low co mpression pressure and their compression remains
low even after the addition of engine oil, cylinder head gaskets are leaking. In such a case, replace cyl-
inder head gaskets. Refer to EM-87, "
Removal and Installation".
10. After inspection is completed, install removed parts.
11. Start the engine, and check that the engine runs smoothly.
WBIA0605E
Compression pressure : Refer to EM-132, "GeneralSpecification".
Revision: 2010 May2011 QX56

EM-34
< REMOVAL AND INSTALLATION >
ROCKER COVER
 Loosen bolts in reverse order shown in the figure.
8. Remove rocker cover gasket from rocker cover.
9. Use scraper to remove all traces of liquid gasket from cylinder head & VVEL ladder assembly.
CAUTION:
Never scratch or damage the mating su rface when cleaning off old liquid gasket.
10. Remove PCV valve from rocker cover, if necessary.
11. Remove oil filler cap from rocker cover, if necessary.
INSTALLATION
1. Apply liquid gasket with the tube presser (commercial service tool) to VVEL ladder assembly (1).
Use Genuine RTV silicone seal ant or equivalent. Refer to
GI-22, "
Recommended Chemical Products and Sealants".
NOTE:
The figure shows an example of bank 1 side.
 Apply liquid gasket on the front and rear side of engine first. [5 mm (0.20 in) + 5 mm (0.20 in) side as shown in the figure]
2. Install rocker cover gasket to rocker cover.
3. Install rocker cover.  Check that rocker cover gasket does not drop fr om the installation groove of rocker cover.
A: Bank 2
B: Bank 1
: Engine front
JPBIA3481ZZ
A : Liquid gasket application point
F : End surface of VVEL ladder assembly
b : 4.0 mm (0.16 in)
c : 2.5 - 3.5 mm (0.098 - 0.138 in)
d : 5.0 mm (0.20 in)
e : 10.0 mm (0.39 in)
: Engine front
JPBIA3480ZZ
Revision: 2010 May2011 QX56

EM-42
< REMOVAL AND INSTALLATION >
EXHAUST MANIFOLD AND THREE WAY CATALYST
 Tighten mounting nuts in numerical order as shown in the figure.CAUTION:
All exhaust manifold nuts are tightened at twice.
Air Fuel Ratio Sensor 1, Heated Oxygen Sensor 2
CAUTION:
 Before installing new sensors, clean exhaust system threads usin g oxygen sensor thread cleaner
(commercial service tool: J-43897-18 or J-43897-12), and apply anti-seize lubricant (commercial ser-
vice tool).
 Sensors are not reusable. Replace them with a ne w one after removal. When replacing them, handle
with care not to impact on them.
 When installing the new air fu el ratio sensors 1 (1), set the
heated oxygen sensor wren ch [SST: KV10117100(J-44626)] (A)
in the hexagonal part to tighten the them.
 Never over torque sensors. Doing so may cause da mage to the sensors, resulting in “MIL” coming
on.
InspectionINFOID:0000000006289552
INSPECTION AFTER DISASSEMBLY
Surface Distortion
 Check the surface distortion of the exhaust manifold mating sur- face with a straightedge (A) and a feeler gauge (B).
 If it exceeds the limit, replace exhaust manifold.
A: Bank 1
B: Bank 2 : Engine front
JPBIA3475ZZ
JPBIA3492ZZ
Limit : Refer to EM-133, "ExhaustManifold".
JPBIA0018ZZ
Revision: 2010 May2011 QX56

EM-56
< REMOVAL AND INSTALLATION >
OIL PAN (LOWER) AND OIL STRAINER
b. Apply a continuous bead of liquid gasket with the tube presser(commercial service tool) to the oil pan (lower) as shown in the
figure.
Use Genuine RTV silicone seal ant or equivalent. Refer to
GI-22, "
Recommended Chemical Products and Sealants".
CAUTION:
Attaching must be done with in 5 minutes after coating.
c. Install oil pan (lower).  Tighten mounting bolts in numerical order as shown in the fig-ure.
3. Install oil pan drain plug.  Refer to the figure of the components of on the prior page for installation direction of drain plug washer.Refer to EM-54, "
Exploded View".
4. Install in the reverse order of removal after this step. NOTE:
Wait at least 30 minutes after oil pan is installed before pouring engine oil.
InspectionINFOID:0000000006289561
INSPECTION AFTER REMOVAL
Clean oil strainer if any object is attached.
INSPECTION AFTER INSTALLATION
1. Check the engine oil level and adjust engine oil. Refer to LU-7, "Inspection".
2. Start engine, and check there is no leakage of engine oil.
3. Stop engine and wait for 15 minutes.
4. Check the engine oil level again. Refer to LU-7, "
Inspection".
a : 7.5 - 9.5 mm (0.295 - 0.374 in)
b: φ4.0 - 5.0 mm (0.157 - 0.197 in)
: Engine front
JPBIA3496ZZ
: Engine front
JPBIA3495ZZ
Revision: 2010 May2011 QX56

OIL PAN (UPPER)EM-59
< REMOVAL AND INSTALLATION >
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a. Use a scraper (A) to remove old liquid gasket from mating sur-
faces.
 Also remove the old liquid gasket from mating surface of cylin-der block.
 Remove old liquid gasket from the bolt holes and threads.
CAUTION:
Never scratch or damage th e mating surfaces when clean-
ing off old liquid gasket.
b. Install new O-rings on the bottom of cylinder block and oil pump.
c. Apply a continuous bead of liquid gasket with tube pre sser (commercial service tool) to the cylinder block
mating surfaces of oil pan (upper) to a limited portion as shown in the figure.
Use Genuine RTV silicone sealant or equivalent. Refer to GI-22, "
Recommended Chemical Prod-
ucts and Sealants".
CAUTION:
Attaching must be done with in 5 minutes after coating.
d. Tighten mounting bolts in numerical order as shown in the fig- ure.
CAUTION:
Install avoiding misal ignment of O-rings.
NOTE:
Tighten mounting bolts No. 1 and 2 in two steps. The numerical
order No. 9 and 16 shown second steps.
 There are four types of mounting bolts. Refer to the following for locating bolts.
e. Tighten transmission joint bolts.
f. Install rear plate cover.
2. Install oil strainer.
JPBIA3503ZZ
a. : 5.5 - 7.5 mm (0.217 - 0.295 in) b. : φ4.0 - 5.0 mm (0.157 - 0.197 in)
: Engine front
JPBIA3504ZZ
: Engine front
JPBIA3502ZZ
Order number for tightening 17, 18 2 (16), 3, 5, 6, 7, 8, 10,
11, 14, 15 1(9), 4 12, 13
Bolt size M6 M8
Bolt length 45 mm (1.77 in) 25 mm (0.98 in) 30.0 mm (1.18 in) 120 mm (4.72 in)
Tightening torque 9.0 N· (0.92 kg-m, 80
in-lb) 22.0 N·m (2.2 kg-m, 16 ft-lb)
Revision: 2010 May2011 QX56