Nissan ENGINE - Page 12

EM-12
< SYSTEM DESCRIPTION >
[VQ40DE]
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
CA—AB—
Tappet
noise
Valve clearance EM-18
Rattle C A — A B C
Camshaft
bearing
noise
Camshaft runout
Camshaft journal oil
clearance
EM-76
EM-76
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
EM-112
EM-112
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
EM-112
EM-112
EM-112
EM-112
Knock A B C B B B
Connect-
ing rod
bearing
noise
Connecting rod bushing
oil clearance
Connecting rod bearing
oil clearance
EM-112
EM-112
Knock A B — A B C
Main bear-
ing noise
Main bearing oil clear-
ance
Crankshaft runout
EM-112
EM-112
Front of
engine
Timing
chain case
Tapping or
ticking
AA—BBB
Timing
chain and
chain ten-
sioner
noise
Timing chain cracks
and wear
Timing chain tensioner
operation
EM-59
EM-67
Front of
engine
Squeak-
ing or fizz-
ing
AB—B—C
Drive belts
(Sticking
or slip-
ping)
Drive belts deflection
EM-13
CreakingABABAB
Drive belts
(Slipping)
Idler pulley bearing op-
eration
Squall
Creak
AB—BAB
Water
pump
noise
Water pump operation CO-21
Rattle — — A — — — VTC VTC lock pin clearance EM-76
Revision: January 2013 2013 Xterra