engine INFINITI QX56 2006 Factory Service Manual

INTAKE MANIFOLDEM-19
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Revision: November 2009 2006 QX56
INSTALLATION
Installation is in the reverse order of removal.

Tighten the intake manifold bolts in numerical order as shown.

Install the EVAP canister purge control solenoid valve connector with it facing front of engine.

Tighten the electronic throttle control actuator bolts of the electric throttle control actuator equally and
diagonally in several steps.

After installation perform procedure in EM-20, "INSPECTION AFTER INSTALLATION" .

Install the water hose so that its overlap width for connection is between 27 mm (1.06 in) and 32 mm (1.26
in) (target: 27 mm 1.06 in).
Connecting Quick Connector of Fuel Tube
Install quick connector as follows (the steps are the same for quick connectors on both engine side and vehi-
cle side except for the quick connector cap).
1. Make sure no foreign substances are deposited in and around tube and quick connector, and they are not
damaged.
2. Thinly apply new engine oil around the fuel tube from tip end to the spool end.
3. Align center to insert quick connector straight into fuel tube.

Insert until the paint mark for engagement identification
(white) goes completely inside quick connector so that you
cannot see it from the straight side of the connected part. Use
a mirror to check this where it is not possible to view directly
from the straight side, such as quick connector on vehicle
side.

Insert fuel tube into quick connector until top spool is com-
pletely inside quick connector, and 2nd level spool exposes
right below quick connector on engine side.
CAUTION:

Hold "A" position in illustration when inserting fuel
tube into quick connector.

Carefully align center to avoid inclined insertion to pre-
vent damage to O-ring inside quick connector.

Insert until you hear a "click" sound and actually feel
the engagement.

To avoid misidentification of engagement with a similar
sound, be sure to perform the next step.
4. Pull quick connector by hand holding "A" position. Make sure it is completely engaged (connected) so that it does not come out from fuel tube.
NOTE:
Recommended pulling force is 50 N (5.1 kg, 11.2 lb).
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PBIC0017E
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EM-20Revision: November 2009
INTAKE MANIFOLD
2006 QX56
5. Install the quick connector cap on the quick connector joint (onengine side only).
6. Install the fuel hose and tube to hose clamps.
7. Refill the engine coolant. Refer to CO-11, "
REFILLING ENGINE
COOLANT" .
INSPECTION AFTER INSTALLATION

After installing fuel tubes, make sure there is no fuel leakage at connections in the following steps.
–Apply fuel pressure to fuel lines by turning ignition switch ON (with engine stopped). Then check for fuel
leaks at connections.
–Start the engine and rev it up and check for fuel leaks at the connections.

Perform procedures for “Throttle Valve Closed Position Learning ” after finishing repairs. Refer to EC-78,
"Throttle Valve Closed Position Learning" .

If electric throttle control actuator is replaced, perform procedures for “Idle Air Volume Learning” after fin-
ishing repairs. Refer to EC-78, "
Idle Air Volume Learning" .
SBIA0354E

EXHAUST MANIFOLD AND THREE WAY CATALYSTEM-21
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Revision: November 2009 2006 QX56
EXHAUST MANIFOLD AND THREE WAY CATALYSTPFP:14004
Removal and InstallationEBS00RF1
REMOVAL
WARNING:
Perform the work when the exhaust and cooling system have cooled sufficiently.
1. Remove the engine undercover (rear) using power tool (4WD models).
2. Remove front final drive assembly (4WD models). Refer to FFD-12, "
Removal and Installation" .
3. Remove the main muffler assembly and center exhaust tube. Refer to EX-3, "
Removal and Installation" .
4. Remove the front exhaust tubes. Refer to EX-3, "
Removal and Installation" .
5. Remove the front tires. Refer to WT-7, "
Rotation" .
6. Remove fender protectors. Refer to EI-23, "
Removal and Installation" .
7. Remove the air fuel ratio A/F sensors (bank 1, bank 2).

Follow steps below to remove each air fuel ratio A/F sensor.
a. Remove the harness connector of each air fuel ratio A/F sensor, and harness from bracket and middle clamp.
1. Air fuel ratio A/F sensor 1 (bank 2) 2. Exhaust manifold cover (bank 2) 3. Exhaust manifold (bank 2)
4. Gaskets 5. Exhaust manifold (bank 1) 6. Exhaust manifold cover (bank 1)
7. Air fuel ratio A/F sensor 1 (bank 1)
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EM-22Revision: November 2009
EXHAUST MANIFOLD AND THREE WAY CATALYST
2006 QX56
b. Remove the air fuel ratio A/F sensors from both left and rightexhaust manifolds using Tool.
CAUTION:

Do not damage the air fuel ratio A/F sensors

Discard any air fuel ratio A/F sensor which has been
dropped from a height of more than 0.5m (19.7 in) onto a
hard surface such as a concrete floor. Replace it with a
new one.
8. Support engine using a suitable tool.
9. Remove the exhaust manifold (LH) following the steps below.
a. Remove the engine mounting insulator. Refer to EM-74
.
b. Remove the exhaust manifold cover.
c. Remove the engine mounting bracket. Refer to EM-74
.
d. Loosen the nuts in reverse order as shown using power tool.
e. Remove the exhaust manifold (LH) (A).
10. Remove the exhaust manifold (RH) following the steps below.
a. Remove the engine mounting insulator. Refer to EM-74
.
b. Remove the exhaust manifold cover.
c. Remove the engine mounting bracket. Refer to EM-74
.
d. Remove the oil level gauge guide. Refer to EM-24
.
e. Loosen the nuts in reverse order as shown using power tool.
f. Remove the exhaust manifold (RH) (B).
INSPECTION AFTER REMOVAL
Surface Distortion

Check the flatness of each exhaust manifold flange surface
using suitable tools.

If measurement exceeds the limit, replace the exhaust manifold.
INSTALLATION
Installation is in the reverse order of removal. Tool number : — (J-44626)
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WBIA0696E
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Flatness limit : 0.3 mm (0.012 in)
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EM-24Revision: November 2009
OIL PAN AND OIL STRAINER
2006 QX56
OIL PAN AND OIL STRAINERP F P : 1111 0
Removal and InstallationEBS00RF2
REMOVAL
WARNING:
To avoid the danger of being scalded, never drain the engine oil when the engine is hot.
1. Remove the engine. Refer to EM-74, "
REMOVAL" .
2. Remove the oil pan (lower) using the following steps.
a. Remove the oil pan (lower) bolts using power tool.
1. Oil pan (upper) 2. O-ring3. O-ring
4. O-ring 5. O-ring (with collar)6. Oil level gauge guide
7. Oil level gauge 8. O-ring9. Connector bolt
10. Oil filter 11. Oil cooler12. Relief valve
13. Oil pressure sensor 14. Gasket15. Drain plug
16. Oil pan (lower) 17. Oil strainer
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OIL PAN AND OIL STRAINEREM-27
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Revision: November 2009 2006 QX56
b. Tighten the oil pan (lower) bolts in numerical order as shown.
4. Install the oil pan drain plug.
5. Install engine assembly. Refer to EM-76, "
INSTALLATION" .

Do not fill the engine oil for at least 30 minutes after oil pan is installed.
INSPECTION AFTER INSTALLATION
1. Check engine oil level and add engine oil if necessary. Refer to LU-7, "OIL LEVEL" .
2. Start the engine, and check for leaks of engine oil.
3. Stop engine and wait for 10 minutes.
4. Check engine oil level again.
PBIC2595E

EM-28Revision: November 2009
IGNITION COIL
2006 QX56
IGNITION COILPFP:22448
Removal and InstallationEBS00RF3
REMOVAL
1. Remove the engine room cover using power tool. Refer to EM-12, "REMOVAL" .
2. Disconnect the harness connector from the ignition coil.
3. Remove the ignition coil. CAUTION:
Do not shock ignition coil.
INSTALLATION
Installation is in the reverse order of removal.
1. Ignition coil 2. Spark plug
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EM-30Revision: November 2009
SPARK PLUG (PLATINUM-TIPPED TYPE)
2006 QX56

Checking and adjusting plug gap is not required between
change intervals.
INSTALLATION
Installation is in the reverse order of removal.

Use standard type spark plug for normal condition.

The hot type spark plug is suitable when fouling occurs with the standard type spark plug under conditions
such as:
–Frequent engine starts
–Low ambient temperatures

The cold type spark plug is suitable when spark knock occurs with the standard type spark plug under
conditions such as:
–Extended highway driving
–Frequent high engine revolution
CAUTION:
Do not drop or shock spark plug.
SMA806CA
Make NGK
Standard type PLFR5A-11
Hot type PLFR4A-11
Cold type PLFR6A-11
Gap (Nominal) : 1.1 mm (0.043 in)

FUEL INJECTOR AND FUEL TUBEEM-31
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Revision: November 2009 2006 QX56
FUEL INJECTOR AND FUEL TUBEPFP:16600
Removal and InstallationEBS00RF5
CAUTION:
Do not remove or disassemble parts unless instructed as shown.
REMOVAL
1. Remove the engine room cover using power tool. Refer to EM-12, "REMOVAL" .
2. Release the fuel pressure. Refer to EC-80, "
FUEL PRESSURE RELEASE" .
3. Disconnect the negative battery terminal.
4. Disconnect the fuel injector harness connectors.
5. Disconnect the fuel hose assembly from the fuel tubes (RH and LH).
CAUTION:

While hoses are disconnected, plug them to prevent fuel from draining.

Do not separate the fuel connector and fuel hose.
6. Remove the fuel injectors with the fuel tube assembly.
1. Fuel tube (RH) 2. Cap3. Fuel damper
4. O-ring 5. O-ring (blue)6. Fuel injector
7. Clip 8. O-ring (brown)9. O-ring
10. Fuel hose assembly 11. Fuel tube (LH)
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EM-32Revision: November 2009
FUEL INJECTOR AND FUEL TUBE
2006 QX56
7. Remove the fuel injector from the fuel tube using the followingsteps.
a. Spread open and remove the clip.
b. Remove the fuel injector from the fuel tube by pulling straight out.
CAUTION:

Be careful with remaining fuel that may leak out from fuel
tube.

Do not damage injector nozzles during removal.

Do not bump or drop fuel injectors.

Do not disassemble fuel injectors.
8. Remove the fuel damper from each fuel tube.
INSTALLATION
1. Install the fuel damper to each fuel tube using the following steps.
a. Apply engine oil to the new O-ring and set it into the cup of the fuel tube.
CAUTION:

Handle O-ring with bare hands. Never wear gloves.

Lubricate new O-ring with new engine oil.

Do not clean O-ring with solvent.

Make sure that O-ring and its mating part are free of for-
eign material.

When installing O-ring, do not scratch it with tool or fin-
gernails.

Do not twist or stretch the O-ring.
b. Make sure that the backup spacer is in the O-ring connecting surface of the fuel damper. NOTE:
The backup spacer is part of the fuel damper assembly.
c. Insert the fuel damper until it seats on the fuel tube. CAUTION:

Insert straight, making sure that the axis is lined up.

Do not pressure-fit with excessive force.
d. Install the cap, and then tighten the bolts evenly.

After tightening the bolts, make sure that there is no gap between the cap and fuel tube.
2. Install new O-rings to the fuel injector paying attention to the items below. CAUTION:

Upper and lower O-rings are different colors.
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Reference value :130 N (13.3 kg, 29.2 lb)
Fuel tube side : Blue
Nozzle side : Brown
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