INFINITI QX56 2006 Factory Service Manual

EM-10Revision: November 2009
NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING
2006 QX56
NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTINGPFP:00003
NVH Troubleshooting —Engine NoiseEBS00RES
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NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTINGEM-11
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Revision: November 2009 2006 QX56
Use the Chart Below to Help You Find the Cause of the Symptom.EBS00RET
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 related
Location of
noise Type of
noise Operating condition of engine
Source of noise Check item Refer-
ence page
Before
warm- up After
warm- up When
start- ing When
idling When
racing While
driv- ing
Top of
engine
Rocker
cover
Cylinder
head Ticking or
clicking
CA
—AB —Tappet noise Valve clearance EM-69
Rattle C A—ABC Camshaft
bearing noiseCamshaft journal clear-
ance
Camshaft runout EM-50EM-50
Crankshaft
pulley
Cylinder
block (Side
of engine)
Oil panSlap or
knock
—
A— BB —Piston pin
noise Piston and piston pin
clearance
Connecting rod bush-
ing clearance EM-95
EM-97
Slap or
rap
A
—— BBA Piston slap
noisePiston-to-bore clear-
ance
Piston ring side clear-
ance
Piston ring end gap
Connecting rod bend
and torsion EM-99EM-95
EM-95
EM-96
Knock A B C B B B
Connecting
rod bearing
noiseConnecting rod bush-
ing oil clearance (Small
end)
Connecting rod bear-
ing clearance (Big end)
EM-97EM-96
Knock A B
—ABC Main bearing
noiseMain bearing oil clear-
ance
Crankshaft runout EM-101EM-100
Front of
engine
Chain case
cover
Front coverTapping
or ticking
AA
—BBB Timing chain
and chain
tensioner
noiseTiming chain cracks
and wear
Timing chain tensioner
operation
EM-40
EM-37
Front of
engineSqueak-
ing or
fizzing
AB
—B— CDrive belts
(Sticking or
slipping) Drive belts deflection
EM-13
Creaking A B A B A B Drive belts
(Slipping)Idler pulley bearing
operation
Squall
Creaking AB
—BAB Water pump
noiseWater pump operation CO-19,
"INSPEC-
TION
AFTER
REMOVA
L"

EM-12Revision: November 2009
ENGINE ROOM COVER
2006 QX56
ENGINE ROOM COVERPFP:14049
Removal and InstallationEBS00REU
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.
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DRIVE BELTSEM-13
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DRIVE BELTSPFP:02117
Checking Drive BeltsEBS00REV
WARNING:
Be sure to perform when the engine is stopped.
1. Remove air duct and resonator assembly when inspecting drive belt.
2. Make sure that indicator (single line notch) of each auto tensioner is within the allowable working range
“A” (between three line notches) as shown.
NOTE:

Check the drive belt auto tensioner indication when the engine is cold.

The indicator notch is located on the moving side of the drive belt auto tensioner.
3. Visually check entire belt for wear, damage or cracks.
4. If the indicator is out of allowable working range or belt is damaged, replace the belt. Refer to EM-13,
"DRIVE BELTS" .
DRIVE BELT TENSION
There is no manual drive belt tension adjustment. The drive belt tension is automatically adjusted by the drive
belt auto tensioner.
Removal and InstallationEBS00REW
REMOVAL
1. Remove the air duct and resonator assembly. Refer to EM-15, "REMOVAL" .
2. Install Tool on drive belt 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 holding tool accidentally comes off.
3. Remove the drive belt.
1. Drive belt 2. Power steering pump pulley 3. Generator pulley
4. Crankshaft pulley 5. A/C compressor6. Idler pulley
7. Cooling fan pulley 8. Water pump pulley9. Drive belt auto tensioner
LBIA0391E
Tool number : — (J-46535)
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EM-14Revision: November 2009
DRIVE BELTS
2006 QX56
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 drive belt
auto tensioner. Refer to EM-13, "
Checking Drive Belts" .
Drive Belt Auto Tensioner and Idler PulleyEBS00REX
REMOVAL
1. Remove the air duct and resonator assembly. Refer to EM-15, "REMOVAL" .
2. Remove the drive belt. Refer to EM-13, "
REMOVAL" .
3. Remove the drive belt auto tensioner and idler pulley using power tool.
INSTALLATION
Installation is in the reverse order of removal.
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1. Drive belt auto tensioner 2. Idler pulley

AIR CLEANER AND AIR DUCTEM-15
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Revision: November 2009 2006 QX56
AIR CLEANER AND AIR DUCTPFP:16500
Removal and InstallationEBS00REY
REMOVAL
1. Remove the engine room cover using power tool. Refer to EM-12, "REMOVAL" .
2. Disconnect the harness connector from air cleaner case (upper).
3. Remove the air duct and resonator assembly and air cleaner case.
4. Remove air cleaner filter and air cleaner case (lower)

Add marks as necessary for easier installation.
INSTALLATION
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
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EM-16Revision: November 2009
AIR CLEANER AND AIR DUCT
2006 QX56
Removal and Installation (Viscous paper type)EBS00REZ
REMOVAL
NOTE:

The viscous paper type filter does not need cleaning between replacement intervals.

Replace the air filter as necessary for periodic maintenance. Refer to MA-16, "VISCOUS PAPER TYPE" .
1. Remove the air duct and resonator assembly.
2. Remove the air cleaner case (upper).
3. Remove the air cleaner filter from the air cleaner case (lower).
INSTALLATION
1. Install the new air cleaner filter in the air cleaner case (lower).
2. Install the air cleaner case (upper).
3. Install the air duct and resonator assembly (inlet).
1. Air cleaner case (upper) 2. Air cleaner filter3. Air cleaner case (lower)
4. Air duct and resonator assembly
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INTAKE MANIFOLDEM-17
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Revision: November 2009 2006 QX56
INTAKE MANIFOLDPFP:14003
Removal and InstallationEBS00RF0
REMOVAL
1. Partially drain the engine coolant. Refer to CO-11, "DRAINING ENGINE COOLANT" .
WARNING:
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-12, "
REMOVAL" .
3. Release the fuel pressure. Refer to EC-80, "
FUEL PRESSURE RELEASE" .
4. Remove the air duct and resonator assembly. Refer to EM-15, "
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
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EM-18Revision: November 2009
INTAKE MANIFOLD
2006 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-31, "
REMOVAL" .
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.Tool number : 16441 6N210 (J-45488)
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INTAKE MANIFOLDEM-19
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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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