Infiniti G20 (P11). Manual - part 381
Use the table 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 the engine.
4. Check the specified noise source.
If necessary, repair or replace these parts.
NVH Troubleshooting — Engine Noise
NCEM0005S01
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
driv-
ing
Top of
engine
Rocker
cover
Cylinder
head
Ticking or
clicking
C
A
—
A
B
—
Tappet
noise
Hydraulic lash adjuster
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 clearance
Piston ring side clear-
ance
Piston ring end gap
Connecting rod bend and
torsion
Knock
A
B
C
B
B
B
Connecting
rod bear-
ing noise
Connecting rod bushing
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
Front of
engine
Squeaking
or fizzing
A
B
—
B
—
C
Other drive
belts
(Sticking or
slipping)
Drive belt deflection
MA-13,
“Checking
Drive
Belts”
Creaking
A
B
A
B
A
B
Other drive
belts (Slip-
ping)
Idler pulley bearing
operation
Squall
Creak
A
B
—
B
A
B
Water
pump
noise
Water pump operation
LC-11,
“Water
Pump
Inspection”
A: Closely related
B: Related
C: Sometimes related
—: Not related
GI
MA
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
EM-9