2007 INFINITI QX56 service

EM-10
< SERVICE INFORMATION >
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NVH Troubleshooting - Engine NoiseINFOID:0000000003586490
AWBIA0149ZZ
1. Timing chain 2. Intake valve 3. Exhaust valve
4. Drive belt 5. Water pump A. VTC noise

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTINGEM-11
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Use the Chart Below to Help You
Find the Cause of the SymptomINFOID:0000000003531519
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 relatedB. Tappet noise C. Camshaft bearing noise D. Valve mechanism
E. Rotation mechanism F. Piston pin noise G. Piston slap noise
H. Main bearing noise I. Connecting rod bearing noise J. Drive belt noise (slipping)
K. Drive belt noise (stick/slipping) L. Water pump noise M. Timing chain and chain tensioner noise
Location of noise Ty p e o f
noise Operating condition of engine
Source of noise Check item
Refer-
ence page
Be-
fore
warm- up After
warm-
up When
start-
ing When
idling When
racing While
driv-
ing
Top of en-
gine
Rocker cov-
er
Cylinder
head Ticking or
clicking
C A — A B — Tappet noise Valve clearance
EM-56
Rattle C A — A B CCamshaft
bearing noiseCamshaft journal clear-
ance
Camshaft runout EM-46EM-46
Crankshaft
pulley
Cylinder
block (Side
of engine)
Oil panSlap or
knock
—A—B B— Piston pin
noisePiston and piston pin
clearance
Connecting rod bushing
clearance EM-93
EM-93
Slap or
rap
A——B B A Piston slap
noisePiston-to-bore clear-
ance
Piston ring side clear-
ance
Piston ring end gap
Connecting rod bend
and torsion EM-93EM-93
EM-93
EM-93
Knock A B C B B B
Connecting
rod bearing
noiseConnecting rod bushing
oil clearance (Small
end)
Connecting rod bearing
clearance (Big end)
EM-93EM-93
Knock A B — A B C
Main bearing
noiseMain bearing oil clear-
ance
Crankshaft runout EM-93EM-93
Front of en-
gine
Chain case
cover
Front coverTapping
or ticking
AA—BBB Timing chain
and chain
tensioner
noiseTiming chain cracks
and wear
Timing chain tensioner
operation
EM-38
EM-38
Front of en-
gineSqueak-
ing or
fizzing
AB—B—C
Drive belts
(Sticking or
slipping)Drive belts deflection
EM-13Creaking A B A B A B Drive belts
(Slipping)Idler pulley bearing op-
eration
Squall
Creaking AB—BAB Water pump
noiseWater pump operation
EM-38
Rattle — — A — — — VTC VTC lockpin clearance EM-55

EM-12
< SERVICE INFORMATION >
ENGINE ROOM COVER
ENGINE ROOM COVER
Removal and InstallationINFOID:0000000003531520
REMOVAL
• Remove the engine cover bolts and cover.CAUTION:
Do not damage or scratch cover when installing or removing.
INSTALLATION
Installation is in the reverse order of removal.
WBIA0795E

DRIVE BELTSEM-13
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DRIVE BELTS
Checking Drive BeltsINFOID:0000000003531521
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 eac
h auto tensioner is within the allowable working range
(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 work ing range or belt is damaged, replace the belt.
DRIVE BELT TENSION
There is no manual drive belt tension adjustment. The driv e belt tension is automatically adjusted by the drive
belt auto tensioner.
Removal and InstallationINFOID:0000000003531522
REMOVAL
1. Remove the air duct and resonator assembly. Refer to EM-15, "Removal and Installation".
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 locat ion 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 compressor 6. Idler pulley
7. Cooling fan pulley 8. Water pump pulley 9. Drive belt auto tensioner
A. Allowable working range
LBIA0391E
Tool number : — (J-46535)
WBIA0537E

EM-14
< SERVICE INFORMATION >
DRIVE BELTS
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 PulleyINFOID:0000000003531523
REMOVAL
1. Remove the air duct and resonator assembly. Refer to EM-15, "Removal and Installation".
2. Remove the drive belt. Refer to EM-13, "
Removal and Installation".
3. Remove the drive belt auto tensioner and idler pulley using power tool.
INSTALLATION
Installation is in the reverse order of removal.
WBIA0607E
1. Drive belt auto tensioner 2. Idler pulley

AIR CLEANER AND AIR DUCTEM-15
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AIR CLEANER AND AIR DUCT
Removal and InstallationINFOID:0000000003531524
REMOVAL
1. Remove the engine room cover using power tool. Refer to
EM-12, "Removal and Installation".
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.
Removal and Installation (Viscous paper type)INFOID:0000000003531525
REMOVAL
1. Air cleaner case (upper) 2. Air cleaner filter 3. Air cleaner case (lower)
4. Air duct and resonator assembly
WBIA0465E
WBIA0465E

EM-16
< SERVICE INFORMATION >
AIR CLEANER AND AIR DUCT
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-6
.
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 filter 3. Air cleaner case (lower)
4. Air duct and resonator assembly

INTAKE MANIFOLDEM-17
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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