INFINITI QX56 2004 Factory Service Manual

EM-8Revision: August 2007
PREPARATION
2004 QX56
Valve guide reamer 1: Reaming valve guide hole
2: Reaming hole for oversize valve guide
Intake & Exhaust:
d
1 : 6.0 mm (0.236 in) dia.
d
2 : 10.175 - 10.196 mm (0.4006 - 0.4014 in)
dia.
Front oil seal drift Installing front oil seal
Rear oil seal drift Installing rear oil seal
(J-43897-18)
(J-43897-12)
Oxygen sensor thread cleanerReconditioning the exhaust system threads
before installing a new A/F sensor and heated
oxygen sensor (Use with anti-seize lubricant
shown below.)
a: J-43897-18 (18 mm dia.) for zirconia
heated oxygen sensor
b: J-43897-12 (12 mm dia.) for titania heat-
ed oxygen sensor
Anti-seize lubricant (Permatex 133AR
or equivalent meeting MIL specifica-
tion MIL-A-907)Lubricating A/F sensors and heated oxygen
sensor thread cleaning tool when recondition-
ing exhaust system threads (Kent-Moore No.)
Tool nameDescription
S-NT016
ZZA0012D
ZZA0025D
AEM488
AEM489

NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING
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NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTINGPFP:00003
NVH Troubleshooting —Engine NoiseEBS00IL7
KBIA2503E

EM-10Revision: August 2007
NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING
2004 QX56
Use the Chart Below to Help You Find the Cause of the Symptom.EBS00IL8
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 relatedLocation of
noiseType of
noiseOperating condition of engine
Source of
noiseCheck itemRefer-
ence page Before
warm-
upAfter
warm-
upWhen
start-
ingWhen
idlingWhen
racingWhile
driv-
ing
To p o f
engine
Rocker
cover
Cylinder
headTicking or
clickingC A — A B — Tappet noise Valve clearanceEM-52
Rattle C A — A B CCamshaft
bearing noiseCamshaft journal clear-
ance
Camshaft runoutEM-47EM-47
Crankshaft
pulley
Cylinder
block (Side
of engine)
Oil panSlap or
knock—A—B B—Piston pin
noisePiston and piston pin
clearance
Connecting rod bush-
ing clearanceEM-90
EM-92
Slap or
rapA——BBAPiston slap
noisePiston-to-bore clear-
ance
Piston ring side clear-
ance
Piston ring end gap
Connecting rod bend
and torsionEM-94EM-90
EM-90
EM-91
Knock ABCBBBConnecting
rod bearing
noiseConnecting rod bush-
ing oil clearance (Small
end)
Connecting rod bear-
ing clearance (Big end)EM-92EM-91
Knock A B — A B CMain bearing
noiseMain bearing oil clear-
ance
Crankshaft runoutEM-96EM-95
Front of
engine
Chain case
cover
Front coverTa p p i n g
or tickingAA—BBBTiming chain
and chain
tensioner
noiseTiming chain cracks
and wear
Timing chain tensioner
operationEM-39
EM-35
Front of
engineSqueak-
ing or
fizzingAB—B—CDrive belts
(Sticking or
slipping)Drive belts deflection
EM-12
CreakingABABABDrive belts
(Slipping)Idler pulley bearing
operation
Squall
CreakingAB—BABWater pum p
noiseWater pump operationCO-15,
"INSPEC-
TION
AFTER
REMOVA
L"

ENGINE ROOM COVER
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ENGINE ROOM COVERPFP:14049
Removal and InstallationEBS00IL9
REMOVAL

Remove the engine cover bolts and cover.
CAUTION:
Do not damage or scratch cover when installing or remov-
ing.
INSTALLATION
Installation is in the reverse order of removal.
WBIA0464E

EM-12Revision: August 2007
DRIVE BELTS
2004 QX56
DRIVE BELTSPFP:02117
Checking Drive BeltsEBS00ILA
WAR NIN G:
Be sure to perform when the engine is stopped.
1. Remove the air duct and resonator assembly when inspecting the drive belt. Refer to EM-14, "
Removal
and Installation" .
2. Make sure that the indicator (single line notch) of each auto tensioner is within the allowable working
range (between three line notches).
NOTE:

Check the auto tensioner indication when the engine is cold.

When the new drive belt is installed, the range should be as shown.

The indicator notch is located on the moving side of the auto tensioner.
3. Visually check the entire belt for wear, damage or cracks.
4. If the indicator is out of allowable working range or belt is damaged, replace the belt.
Tension AdjustmentEBS00ILB
Belt tensioning is not necessary, as it is automatically adjusted by the auto tensioner.
Removal and InstallationEBS00ILC
DRIVE BELT
Removal
1. Remove the air duct and resonator assembly. Refer to EM-14, "Removal and Installation" .
2. Install Tool on auto tensioner pulley bolt, move in the direction of
arrow (loosening direction of tensioner) as shown.
CAUTION:
Avoid placing hand in a location where pinching may occur
if the tool accidentally comes off.
3. Remove the drive belt.
LBIA0391E
1. Drive belt 2. Power steering pump pulley 3. Generator pulley
4. Crankshaft pulley 5. A/C compressor 6. Idler pulley
7. Cooling fan pulley 8. Water pump pulley 9. Drive belt tensioner
Tool number : — (J-46535)
WBIA0537E

DRIVE BELTS
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INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
Make sure belt is securely installed around all pulleys.

Rotate the crankshaft pulley several turns clockwise to equalize belt tension between pulleys.

Make sure belt tension is within the allowable working range, using the indicator notch on the auto ten-
sioner. Refer to EM-12, "
Checking Drive Belts" .
Drive Belt Auto Tensioner and Idler PulleyEBS00ILD
REMOVAL
1. Remove the air duct and resonator assembly. Refer to EM-14, "Removal and Installation" .
2. Remove the drive belt. Refer to EM-12, "
Checking Drive Belts" .
3. Remove the auto tensioner and idler pulley using power tool.
INSTALLATION
Installation is in the reverse order of removal.
WBIA0607E
1. Auto tensioner 2. Idler pulley

EM-14Revision: August 2007
AIR CLEANER AND AIR DUCT
2004 QX56
AIR CLEANER AND AIR DUCTPFP:16500
Removal and InstallationEBS00ILE
REMOVAL
1. Remove the engine room cover using power tool. Refer to EM-14, "REMOVAL" .
2. Disconnect the harness connector from the air cleaner case (upper).
3. Remove the air duct and resonator assembly and air cleaner case.

Add marks as necessary for easier installation.
INSTALLATION
Installation is in the reverse order of removal.
CHANGING AIR CLEANER FILTER
1. Remove the air duct and resonator assembly and air cleaner case (upper).
2. Remove the air cleaner filter from the air cleaner case.
3. Installation is in the reverse order of removal.
1. Air cleaner case (upper) 2. Air cleaner filter 3. Air cleaner case (lower)
4. Air duct and resonator assembly
WBIA0465E

INTAKE MANIFOLD
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INTAKE MANIFOLDPFP:14003
Removal and InstallationEBS00ILF
REMOVAL
1. Partially drain the engine coolant. Refer to MA-12, "DRAINING ENGINE COOLANT" .
WAR NIN G:
To avoid the danger of being scalded, never drain the engine coolant when the engine is hot.
2. Remove the engine room cover using power tool. Refer to EM-11, "
REMOVAL" .
3. Release the fuel pressure. Refer to EC-46, "
FUEL PRESSURE RELEASE" .
4. Remove the air duct and resonator assembly. Refer to EM-14, "
REMOVAL" .
5. Disconnect the fuel tube quick 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 sole-
noid valve
10. Bracket 11. Gasket
KBIA2461E
LBIA0395E

EM-16Revision: August 2007
INTAKE MANIFOLD
2004 QX56

Perform the following steps to disconnect the quick connector
using 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 not disconnect quick connector.
Hold Tool where it contacts 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 quick connector 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-29, "
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.Tool number : 16441 6N210 (J-45488)
SBIA0354E
WBIA0604E
KBIA2462E

INTAKE MANIFOLD
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Revision: August 20072004 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-18, "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).
KBIA2462E
PBIC0017E
KBIA0272E