Nissan Pathfinder (2008 year). Manual — part 356
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
EM-11
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FUNCTION DIAGNOSIS
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NVH Troubleshooting - Engine Noise
INFOID:0000000001281968
Use the Chart Below to Help You Find the Cause of the Symptom
INFOID:0000000001281969
1.
Locate the area where noise occurs.
PBIC2873E
EM-12
< FUNCTION DIAGNOSIS >
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NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
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
driving
Top of en-
gine
Rocker
cover
Cylinder
head
Ticking or
clicking
C
A
—
A
B
—
Tappet
noise
Valve clearance
Rattle
C
A
—
A
B
C
Camshaft
bearing
noise
Camshaft runout
Camshaft journal oil
clearance
Crank-
shaft pul-
ley
Cylinder
block
(Side of
engine)
Oil pan
Slap or
knock
—
A
—
B
B
—
Piston pin
noise
Piston to piston pin oil
clearance
Connecting rod bushing
oil clearance
Slap or
rap
A
—
—
B
B
A
Piston
slap noise
Piston to cylinder bore
clearance
Piston ring side clear-
ance
Piston ring end gap
Connecting rod bend
and torsion
Knock
A
B
C
B
B
B
Connect-
ing rod
bearing
noise
Connecting rod bushing
oil clearance
Connecting rod bearing
oil clearance
Knock
A
B
—
A
B
C
Main bear-
ing noise
Main bearing oil clear-
ance
Crankshaft runout
Front of
engine
Timing
chain case
Tapping or
ticking
A
A
—
B
B
B
Timing
chain and
chain ten-
sioner
noise
Timing chain cracks
and wear
Timing chain tensioner
operation
Front of
engine
Squeak-
ing or fizz-
ing
A
B
—
B
—
C
Drive belts
(Sticking
or slip-
ping)
Drive belts deflection
Creaking
A
B
A
B
A
B
Drive belts
(Slipping)
Idler pulley bearing op-
eration
Squall
Creak
A
B
—
B
A
B
Water
pump
noise
Water pump operation
Rattle
—
—
A
—
—
—
VTC
VTC lock pin clearance
DRIVE BELTS
EM-13
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ON-VEHICLE MAINTENANCE
DRIVE BELTS
Checking Drive Belts
INFOID:0000000001281971
WARNING:
Be sure to perform when the engine is stopped.
1.
Remove air duct and resonator assembly when inspecting drive belt. Refer to
.
2.
Visually check entire belt for wear, damage or cracks.
Tension Adjustment
INFOID:0000000001281972
Belt tensioning is not necessary, as it is automatically adjusted by auto tensioner.
Removal and Installation
INFOID:0000000001281973
DRIVE BELT
Removal
1.
Remove air duct and resonator assembly. Refer to
EM-25, "Removal and Installation"
2.
Rotate the drive belt auto tensioner in the direction of arrow
(loosening direction of tensioner) as shown, using suitable tool.
CAUTION:
Avoid placing hand in a location where pinching may occur
if the tool accidentally comes off.
3.
Remove the drive belt.
Installation
Installation is in the reverse order of removal.
CAUTION:
Make sure belt is securely installed around all pulleys.
LBIA0427E
1.
Drive belt
2.
Power steering oil pump pulley
3.
Generator pulley
4.
Crankshaft pulley
5.
A/C compressor
6.
Cooling fan pulley
7.
Idler pulley
8.
Drive belt tensioner
LBIA0428E
EM-14
< ON-VEHICLE MAINTENANCE >
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DRIVE BELTS
Drive Belt Auto Tensioner and Idler Pulley
INFOID:0000000001281974
REMOVAL
1.
Remove air duct and resonator assembly. Refer to
EM-25, "Removal and Installation"
2.
Remove drive belt. Refer to
EM-13, "Removal and Installation"
.
3.
Remove engine cooling fan assembly (motor driven type). Refer to
CO-20, "Removal and Installation
.
4.
Remove auto tensioner and idler pulley using power tool.
INSTALLATION
Installation is in the reverse order of removal.
LBIA0429E
1.
Idler pulley
2.
Drive belt auto tensioner
AIR CLEANER FILTER
EM-15
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AIR CLEANER FILTER
Changing Air Cleaner Filter
INFOID:0000000001281976
REMOVAL
1.
Unhook clips, and lift air cleaner case (upper).
2.
Remove air cleaner filter.
INSTALLATION
Installation is in the reverse order of removal.
1.
Air cleaner case (lower)
2.
Air cleaner filter
3.
Air cleaner case (upper)
4.
Air duct and resonator
⇐
Front
AWBIA0133GB
EM-16
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SPARK PLUG
SPARK PLUG
Changing Spark Plugs
INFOID:0000000001281982
REMOVAL
1.
Remove the ignition coil. Refer to
EM-41, "Removal and Installation"
.
2.
Remove the spark plug using a suitable tool.
CAUTION:
Do not drop or shock it.
INSPECTION AFTER REMOVAL
• Do not use a wire brush to clean the spark plug.
• If plug tip is covered with carbon, spark plug cleaner may be used.
1.
Ignition coil
2.
Spark plug
PBIC2901E
SEM294A
SMA773C
Cleaner air pressure
: Less than 588 kPa (5.9 bar, 6 kg/cm
2
, 85 psi)
Cleaning time
: Less than 20 seconds
SPARK PLUG
EM-17
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• Checking and adjusting plug gap is not required between change
intervals.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:
Do not drop or shock the spark plug.
SMA806CA
Make
NGK
Standard type
DILFR5A-11
Gap (nominal)
1.1 mm (0.043 in)
EM-18
< ON-VEHICLE MAINTENANCE >
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CAMSHAFT VALVE CLEARANCE
CAMSHAFT VALVE CLEARANCE
Valve Clearance
INFOID:0000000001281988
INSPECTION
NOTE:
Perform the following inspection after removal, installation or replacement of camshaft or valve-related parts,
or if there are unusual engine conditions due to changes in valve clearance over time (starting, idling, and/or
noise).
1.
Warm up the engine. Then stop the engine.
2.
Remove rocker covers (right and left banks). Refer to
EM-42, "Removal and Installation"
.
3.
Measure the valve clearance as follows:
a.
Set No. 1 cylinder at TDC of its compression stroke.
• Rotate crankshaft pulley clockwise to align timing mark
(grooved line without color) with timing indicator.
• Make sure that intake and exhaust cam noses on No. 1 cylin-
der (engine front side of RH bank) are located as shown.
• If not, rotate crankshaft one revolution (360
°
) and align as
shown.
b.
Use feeler gauge, measure the clearance between valve lifter
and camshaft.
Valve clearance:
Unit: mm (in)
*: Approximately 80
°
C (176
°
F)
KBIA1717J
SEM418G
SEM139D
Cold
Hot * (reference data)
Intake
0.26 - 0.34 (0.010 - 0.013)
0.304 - 0.416 (0.012 - 0.016)
Exhaust
0.29 - 0.37 (0.011 - 0.015)
0.308 - 0.432 (0.012 - 0.017)
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