Infiniti I30 (A33). Manual — part 472
NHEM0005
SEM646F
GI
MA
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
EM-7
NVH Troubleshooting — Engine Noise
NHEM0005S01
Use the chart below to help you find the cause of the symptom.
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.
Location of
noise
Type of
noise
Operating condition of engine
Source of
noise
Check item
Reference
page
Before
warm-up
After
warm-up
When
starting
When
idling
When
racing
While
driving
Top of
engine
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 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 bush-
ing 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
Connect-
ing rod
bearing
noise
Connecting rod bush-
ing clearance (Small
end)
Connecting rod bearing
clearance (Big end)
Knock
A
B
—
A
B
C
Main bear-
ing noise
Main bearing oil clear-
ance
Crankshaft runout
Front of
engine
Timing
chain
cover
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
Squeaking
or fizzing
A
B
—
B
—
C
Other
drive belts
(Sticking
or slipping)
Drive belts deflection
MA section
(“Checking
Drive
Belts”,
“ENGINE
MAINTE-
NANCE”)
Creaking
A
B
A
B
A
B
Other
drive belts
(Slipping)
Idler pulley bearing
operation
Squall
Creak
A
B
—
B
A
B
Water
pump
noise
Water pump operation
LC section
(“Water
Pump
Inspection”,
“ENGINE
COOLING
SYSTEM”)
A: Closely related
B: Related
C: Sometimes related
—: Not related
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
NVH Troubleshooting — Engine Noise
EM-8
Removal and Installation
NHEM0006
SEM585G
1.
Intake manifold collector support
2.
Intake manifold collector
3.
Fuel damper and fuel feed hose
assembly
4.
Injector
5.
Fuel tube assembly
6.
Fuel pressure regulator
7.
Ignition coil with power transistor
8.
Ornament cover
9.
Intake manifold
10. Throttle body
11. IACV-AAC valve
12. EVAP canister purge volume con-
trol solenoid valve
GI
MA
LC
EC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
OUTER COMPONENT PARTS
Removal and Installation
EM-9
SEM586G
1.
Intake manifold upper support
2.
Intake manifold lower support
3.
Camshaft position sensor
(PHASE)
4.
Thermostat with water inlet
5.
Exhaust manifold
6.
Water outlet
7.
Water control valve
8.
Water connector
9.
Cylinder block water outlet
OUTER COMPONENT PARTS
Removal and Installation (Cont’d)
EM-10
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