2011 INFINITI QX56 engine

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.
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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
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Limit : Refer to EM-133, "ExhaustManifold".
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Revision: 2010 May2011 QX56

HIGH PRESSURE FUEL PUMP AND FUEL HOSEEM-43
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HIGH PRESSURE FUEL
PUMP AND FUEL HOSE
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CAUTION:
Never remove or disassemble parts unless instructed as shown in the figure.
Removal and InstallationINFOID:0000000006289554
REMOVAL
WARNING:
 Be sure to read EM-4, "
Precaution for Handling High Pressure Fuel System" when working on the
high pressure fuel system.
 Put a “CAUTION: FLAMMABLE” sign in the workshop.
 Be sure to work in a well ventila ted area and furnish workshop with a CO
2 fire extinguisher.
 Never smoke while servicing fuel system. Keep op en flames and sparks away from the work area.
 To avoid the danger of being scalded, never drain engine coolant when engine is hot.
1. Release fuel pressure. Refer to EC-153, "
Work Procedure".
2. Remove intake manifold. Refer to EM-30, "
Removal and Installation".
3. Disconnect harness connector from high pressure fuel pump.
1. High pressure fuel pump insulator 2. High pressure fuel pump 3. O-ring
4. Lifter 5. Fuel pump connector protector 6. Copper washer
7. Fuel feed hose 8. Copper washer 9. Low fuel pressure sensor
10. Bracket 11. Fuel feed tube (pump side)
A. From fuel tank
: Engine front
Refer to GI-4, "
Components" for symbols in the figure.
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 To keep clean the connecting portion and to avoid dam-
age and foreign materials, cover them completely with
plastic bags, etc. or a similar item.
8. Disconnect harness connector from low fuel pressure sensor.
9. Remove fuel hose assembly.
10. Remove fuel pressure sensor. CAUTION:
 Never allow water and foreign mate rials enter into the connector.
 Never reuse the dropped sensor.
 Carefully handle sensor avoiding shocks.
 Use hex head support installation fo r removal and installation of sensor.
 The contact surface of gasket must not have any stain or scoring by dust etc.
INSTALLATION
1. Install O-ring to high pressure fuel pump. When handi ng new O-ring, paying attention to the following cau-
tion items:
CAUTION:
 Handle O-ring with bare hands. Never wear gloves.
 Lubricate O-ring with new engine oil.
 Never clean O-ring with solvent.
 Check that O-ring and its mating pa rt are free of foreign material.
 When installing O-ring, be careful not to scratch it with tool or fingernails. Also be careful not to
twist or stretch O-ring. If O-ring was stretched wh ile it was being attached, never insert it quickly
into fuel tube.
 Insert new O-ring straight into fu el rail. Never decenter or twist it.
2. Install fuel pressure sensor.
3. Install fuel hose assembly.  Temporarily tighten mounting bolt (A) as shown in the figure.
4. Install high pressure fuel pump to front cover. CAUTION:
After removing lifter, replace lifter with a new one.
5. Connect fuel feed hose to high pressure fuel pump. NOTE:
 Never allow the machined edge of the high pr essure fuel pump to contact with gasket.
 The gasket contact area must be free of dust and scratches.
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: Engine front
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EM-46
< REMOVAL AND INSTALLATION >
HIGH PRESSURE FUEL PUMP AND FUEL HOSE
 Check that rotation stopper (A) of fuel feed hose contact highpressure fuel pump.
6. Tighten mounting bolts that are temporarily tightened in step 3.
7. Connect harness connector to high pressure fuel pump.
8. Install fuel pump connector protector.
9. Connect harness connector to low fuel pressure sensor.
10. Note the following, and connect quick connector to install fuel feed hose.
a. Check the connection for foreign material and damage.
b. Align center to insert quick connector straightly into fuel tube. NOTE:
The figure shows engine side as an example.
 Insert fuel tube into quick connector until the top spool on fueltube is inserted completely and the second level spool is posi-
tioned slightly below quick connector bottom end.
CAUTION:
 Hold “A” position in the figure 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 “c lick” sound and actually feel
the engagement.
 To avoid misidentification of engagement with a similar sound , be sure to perform the next
step.
c. Before clamping fuel feed hose with hose clamps, pull quick connector hard by hand holding “A” position.
Check it is completely engaged (connected) so that it does not come out from fuel feed tube.
d. Install quick connector cap to quick connector connection.  Install so that the arrow mark on the side faces up.
CAUTION:
 Check that quick connector and fuel tube are securely fitinto quick connector cap installation groove.
 If quick connector cap canno t be installed smoothly,
quick connector may have not been installed correctly.
Check connection again.
11. Install in the reverse order of removal.
InspectionINFOID:0000000006289555
INSPECTION AFTER INSTALLATION
Check for Fuel Leakage
1. Turn ignition switch “ON” (with the engine stopped). With fuel pressure applied to fuel piping, check that
there is no fuel leakage at connection points.
NOTE:
Use mirrors for checking at points out of clear sight.
2. Start the engine. With engine speed increased, check again that there is no fuel leakage at connection
points.
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HIGH PRESSURE FUEL PUMP AND FUEL HOSEEM-47
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CAUTION:
Never touch the engine immediately after it is
stopped because the engine is extremely hot.
Revision: 2010 May2011 QX56

FUEL INJECTOR AND FUEL TUBEEM-49
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Removal and InstallationINFOID:0000000006289557
REMOVAL
WARNING:
 Be sure to read
EM-4, "
Precaution for Handling High Pressure Fuel System" when working on the
high pressure fuel system.
 Put a “CAUTION: FLAMMABLE” sign in the workshop.
 Be sure to work in a well ventila ted area and furnish workshop with a CO
2 fire extinguisher.
 Never smoke while servicing fuel system. Keep op en flames and sparks away from the work area.
 To avoid the danger of being scalded, never drain engine coolant when engine is hot.
1. Release fuel pressure. Refer to EC-153, "
Work Procedure".
2. Remove intake manifold. Refer to EM-30, "
Removal and Installation".
3. Remove fuel feed tube (pump side) and fuel feed tube (bank side). CAUTION:
Never reuse fuel feed tube.
4. Remove fuel rail (bank 1) and fuel rail (bank 2).
5. Disconnect harness connector from fuel injectors.
6. Remove fuel injector from cylinder head as per the following: CAUTION:
 Be careful with remaining fuel th at may go out from fuel tube.
 Be careful not to damage in jector nozzles during removal.
 Never bump or drop fuel injector.
 Never disassemble fuel injector.
a. Remove injector holder.
b. Install an injector remover [SST: KV10119600 (—)] (A) to the injector connector side so that cutout (B) of injector remover
faces the injector connector side.
 Hook pawl portion (B) of injector remover [SST: KV10119600(—)] (A) to groove portion (C) of injector.
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EM-50
< REMOVAL AND INSTALLATION >
FUEL INJECTOR AND FUEL TUBE
c. Press down body portion (A) of injector remover [SST:KV10119600 (—)] until it contacts cylinder head.
d. Tighten injector remover [SST: KV10119600 (—)] clockwise and remove injector from cylinder head.
e. Cut Teflon seal (1) while pinching it. Be careful not to damage injector.
f. Remove insulator from mounting ho le of fuel injector of cylinder
head.
INSTALLATION
1. Install seal ring to fuel injector as per the following: CAUTION:
 Handle seal ring with bare hands. Never wear gloves.
 Never apply engine oil to seal ring.
 Never clean seal ring with solvent.
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FUEL INJECTOR AND FUEL TUBEEM-51
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a. Install an injector seal drift set [SST: KV101197S0 (—)] (A) to
fuel injector (1).
b. Set seal ring (1) to injector seal drift set [SST: KV101197S0 (—)]
(A).
c. Straightly insert seal ring (1), which is set in step 2, to fuel injec- tor as shown in the figure and install.
CAUTION:
Be careful that seal ring do es not exceed the groove portion
of fuel injector.
d. Insert injector seal drift set [SST: KV101197S0 (—)] (A) to injec- tor and rotate clockwise and counterclockwise by 90 ° while
pressing seal ring to fit it.
NOTE:
Compress seal ring, because this operation is for rectifying
stretch of seal ring caused by installation and for preventing
sticking when inserting injector into cylinder head.
2. Install O-ring and backup ring to fuel injector. When handing new O-ring and backup ring, paying attention to the following caution items:
CAUTION:
 Handle O-ring with bare hands. Never wear gloves.
 Lubricate O-ring with new engine oil.
 Never clean O-ring with solvent.
 Check that O-ring and its mating pa rt are free of foreign material.
 When installing O-ring, be careful not to scratch it with tool or fingernails. Also be careful not to
twist or stretch O-ring. If O-ring was stretched wh ile it was being attached, never insert it quickly
into fuel tube.
 Insert new O-ring straight into fu el rail. Never decenter or twist it.
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Revision: 2010 May2011 QX56