2007 INFINITI QX56 fuel

PREPARATIONEM-7
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KV10115600
(J-38958)
Valve oil seal drift
Installing 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-47245)
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
LBIA0451E
PBIC0198E
WBIA0536E

INTAKE MANIFOLDEM-17
< SERVICE INFORMATION >
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INTAKE MANIFOLD
Removal and InstallationINFOID:0000000003531526
REMOVAL
1. Partially drain the engine coolant. Refer to
CO-9, "Changing Engine Coolant".
WARNING:
To avoid the danger of being scalded, never drai n the engine coolant when the engine is hot.
2. Remove the engine room cover using power tool. Refer to EM-12, "
Removal and Installation".
3. Release the fuel pressure. Refer to EC-80, "
Fuel Pressure Check".
4. Remove the air duct and resonator assembly. Refer to EM-15, "
Removal and Installation".
5. Disconnect the fuel tube qui ck connector on the engine side.
1. Intake manifold 2. PCV hose 3. Gasket
4. Electric throttle control actuator 5. Water hose 6. Water hose
7. PCV hose 8. EVAP hose 9. EVAP canister purge control solenoid
valve
10. Bracket 11. Gasket
KBIA2461E
LBIA0395E

EM-18
< SERVICE INFORMATION >
INTAKE MANIFOLD
• Perform the following steps to disconnect the quick connectorusing Tool.
a. Remove quick connector cap (engine side only).
b. With the sleeve side of Tool facing quick connector, install Tool onto fuel tube.
c. Insert Tool into quick connector until sleeve contacts and goes no further. Hold the Tool in that position.
CAUTION:
Inserting the Tool hard will no t disconnect quick connector.
Hold Tool where it cont acts and goes no further.
d. Draw and pull out quick connector straight from fuel tube. CAUTION:
• Pull quick connector holding "A" position in illustration.
• Do not pull with lateral force applied. O-ring inside quickconnector may be damaged.
• Prepare container and cloth beforehand as fuel will leak out.
• Avoid fire and sparks.
• Be sure to cover openings of disconnected pipes with plug or plastic bag to avoid fuel leakage
and entry of foreign materials.
6. Remove or disconnect harnesses, brackets, vacuum hose, vacuum gallery and PCV hose and tube from intake manifold.
7. Remove electric throttle control actuator by loosening bolts diagonally. CAUTION:
• Handle carefully to avoid any damage to the electric throttle control actuator.
• Do not disassemble.
8. Remove the fuel injectors and fuel tube assembly. Refer to EM-31, "
Removal and Installation".
9. Loosen the bolts in reverse order shown using power tool.
10. Remove the intake manifold. CAUTION:
Cover engine openings to avoid entry of foreign materials.
• Clean all gasket mating surfaces, do not reuse gaskets.
INSTALLATION
Installation is in the reverse order of removal. Tool number : 16441 6N210 (J-45488)
SBIA0354E
WBIA0604E
KBIA2462E

INTAKE MANIFOLDEM-19
< SERVICE INFORMATION >
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• Tighten the intake manifold bolts in numerical order as shown.
• Install the EVAP canister purge control solenoi
d valve connector with it facing front of engine.
• Tighten the electronic throttle control actuator bolts of the electric throttle control actuator equally and diago-
nally in several steps.
• After installation perform 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 tubeinto 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).
KBIA2462E
PBIC0017E
KBIA0272E

EM-20
< SERVICE INFORMATION >
INTAKE MANIFOLD
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-9, "
Changing 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 i gnition 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-77, "
Throt-
tle Valve Closed Position Learning".
• If electric throttle control actuator is replaced, perform procedures for idle air volume learning” after finishing
repairs. Refer to EC-78, "
Idle Air Volume Learning".
SBIA0354E

EXHAUST MANIFOLD AND THREE WAY CATALYST
EM
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< ON-VE HICLE REPAIR >
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EXHAUST MANIFOLD AND THREE WA Y CATALYST
Exploded ViewINFOID:000 0000004918768
Removal and Installa tionINFOID:000 0000005190289
REMOVAL
WARNING:
Perf
o rm the wo rk when the exhau st and cooling system have co oled 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 front tires. Refer to WT-7, "Rotation".
6. Remove fender protectors. Refer to EI-22, "Removal and Installation".
7. Remove the LH and RH air fuel ratio A/F sensors.
•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. Gaskets5.Exhaust manifold (bank 1)6. Exhaust manifold cover (bank 1)
7. Air fuel ratio A/F sensor 1 (bank 1)A.UpB.Coated face
C. Manifold sideD. Up markFront
AWBIA04 53GB

EM-22
< ON-VEHICLE REPA IR >
EXHAUST MANIFOLD AND THREE WAY CATALYST
b. Remove the air fuel ratio A /F sensors from both LH and RH
exhaust
manifolds using T ool.
CAUTIO
N:
•Do not damage the air fuel ratio A/F sensors
•D iscard any air fuel ratio A /F sensor which h as been
dr
opped from a heig ht of more than 0.5m ( 19.7 in) onto a
h ard surface such as a c on crete floor. Re place it with a
new one.
8. Support the engine using a suitable t ool.
9. Remove the exhaust manifold (LH) (A) following the steps
belo
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•: Front
•B: Exhaust manifold (RH)
a. Remove the engine mounting insulator. Refer to EM-74.
b. Remove the exhaust manif old 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) (B) following the steps
belo
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•: Front
•A: Exhaust manifold (LH)
a. Remove the engine mounting insulator. Refer to EM-74.
b. Remove the exhaust manif old c over.
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 ex hau st manif old (RH) (B).
INSP ECTION AFTER REMOVAL
Surface Distortion
•C heck the flatness of each exhaust manifold flange surface using
sui
t able tools.
•If measurement exc eeds the limi t, replace the exhaust manifold.
INST ALLA TION
Installation is in the reverse order of removal.
To ol number: — (J-4 4626)
WBIA 0630E
AW BIA0814ZZ
AW BIA0814ZZ
Fl atness limit: 0.3 mm (0. 012 in)
KBIA 2504E

EXHAUST MANIFOLD AND THREE WAY CATALYST
EM-23
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• Install new exhaust manifold gasket with the top of the triangular
up mark on it facing up and its coated face (gray side) toward the
exhaust manifold side.
• Tighten the exhaust manifold nuts LH and RH in the numerical order shown. Then recheck the torque of the nuts.
- A: Exhaust manifold (LH)
- B: Exhaust manifold (RH)
- : Front
• Before installing new air fuel ratio A/F sensors, clean the exhaust system threads using suitable tool and
apply anti-seize lubricant.
CAUTION:
• Do not over tighten the air fuel ratio A/F sen sors. Doing so may cause damage to the sensor,
resulting in the MIL coming on.
KBIA2553E
AWBIA0814ZZ
Oxygen sensor thread cleaner : (J-43879-12)
Oxygen sensor thread cleaner : (J-43897-18)