Nissan Titan. Instruction — part 302
EM-12
< SYSTEM DESCRIPTION >
NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING
Use the Chart Below to Help You Find the Cause of the Symptom
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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.
1.
Timing chain
2.
Intake valve
3.
Exhaust valve
4.
Drive belt
5.
Water pump
A.
VTC noise
B.
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
Type of
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
Rattle
C
A
—
A
B
C
Camshaft
bearing noise
Camshaft journal clear-
ance
Camshaft runout
Crankshaft
pulley
Cylinder
block (Side
of engine)
Oil pan
Slap or
knock
—
A
—
B
B
—
Piston pin
noise
Piston and piston pin
clearance
Connecting rod bushing
clearance
Slap or
rap
A
—
—
B
B
A
Piston slap
noise
Piston-to-bore clear-
ance
Piston ring side clear-
ance
Piston ring end gap
Connecting rod bend
and torsion
Knock
A
B
C
B
B
B
Connecting
rod bearing
noise
Connecting rod bushing
oil clearance (Small
end)
Connecting rod bearing
clearance (Big end)
Knock
A
B
—
A
B
C
Main bearing
noise
Main bearing oil clear-
ance
Crankshaft runout
Front of en-
gine
Chain case
cover
Front cover
Tapping
or ticking
A
A
—
B
B
B
Timing chain
and chain
tensioner
noise
Timing chain cracks
and wear
Timing chain tensioner
operation
NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING
EM-13
< SYSTEM DESCRIPTION >
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
A: Closely related B: Related C: Sometimes related —: Not related
Front of en-
gine
Squeak-
ing or
fizzing
A
B
—
B
—
C
Drive belts
(Sticking or
slipping)
Drive belts deflection
Creaking
A
B
A
B
A
B
Drive belts
(Slipping)
Idler pulley bearing op-
eration
Squall
Creaking
A
B
—
B
A
B
Water pump
noise
Water pump operation
Rattle
—
—
A
—
—
—
VTC
VTC lock pin clearance
Location of
noise
Type of
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
EM-14
< PERIODIC MAINTENANCE >
DRIVE BELTS
PERIODIC MAINTENANCE
DRIVE BELTS
Checking Drive Belts
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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 drive belt auto-tensioner is within the allowable work-
ing range (between three line notches).
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 drive belt for wear, damage or cracks.
4. If the indicator is out of allowable working range or drive belt is damaged, replace the drive belt. Refer to
.
DRIVE BELT TENSION
There is no instruction drive belt tension adjustment. The drive belt tension is automatically adjusted by the drive
belt auto-tensioner.
Removal and Installation
INFOID:0000000009886400
REMOVAL
1. Remove the air duct and resonator assembly. Refer to
EM-26, "Removal and Installation"
.
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
DRIVE BELTS
EM-15
< PERIODIC MAINTENANCE >
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
2. Install Tool on drive belt auto-tensioner pulley bolt, move in the
direction of arrow (loosening direction of tensioner) as shown.
WARNING:
Avoid placing hand in a location where pinching may occur
if the holding 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.
• 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
.
Drive Belt Auto-Tensioner and Idler Pulley
INFOID:0000000009886401
REMOVAL
1. Remove the drive belt. Refer to
EM-14, "Removal and Installation"
.
2. Remove the drive belt auto-tensioner and idler pulley using power tool.
INSTALLATION
Installation is in the reverse order of removal.
Tool number
: — (J-46535)
WBIA0537E
AWBIA0975ZZ
1.
Drive belt auto-tensioner
2.
Idler pulley
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