NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING 1.
Piston pin noise
2.
Piston slap noise
3.
Main bearing noise
4.
Water pump noise
5.
Timing chain and tensioner noise
6.
Drive belt noise (stick/slipping)
7.
Tappet noise
8.
Camshaft bearing noise
9.
Connecting rod noise
A.
Rotational mechanism
B.
Water pump
C.
Timing chain
D.
Drive belt
E.
Crankshaft pulley
F.
A/C compressor
G.
Water pump
H.
Alternator
I.
Tension pulley
J.
Valve mechanism
K.
Valves
Use the Chart Below to Help You Find the Cause of the Symptom.
EBS00T5Q
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. Operating condition of engine Location of noise Top of engine Rocker cover Cylinder head
Type of noise
Front of engine Front cover
Front of engine
Reference page
After warmup
When starting
When idling
When racing
While driving
Ticking or clicking
C
A
—
A
B
—
Tappet noise
Valve clearance
EM-107
Rattle
C
A
—
A
B
C
Camshaft bearing noise
Camshaft journal oil clearance Camshaft runout
EM-49 EM-49
—
Piston pin noise
Piston to piston pin oil clearance Connecting rod bushing oil clearance
EM-95 EM-97
Piston to cylinder bore clearance Piston ring side clearance Piston ring end gap Connecting rod bend and torsion
EM-99 EM-96 EM-96 EM-97
Slap or knock
Crankshaft pulley Cylinder block (Side of engine) Oil pan
Source of noise
Before warmup
—
A
—
B
B
Check item
Slap or rap
A
—
—
B
B
A
Piston slap noise
Knock
A
B
C
B
B
B
Connecting rod bearing noise
Connecting rod bushing oil clearance Connecting rod bearing oil clearance
EM-97 EM-101
Knock
A
B
—
A
B
C
Main bearing noise
Main bearing oil clearance Crankshaft runout
EM-101 EM-100
B
Timing chain and chain tensioner noise
Timing chain cracks and wear Timing chain tensioner operation
EM-41
C
Drive belt (Sticking or slipping)
Drive belt deflection
Tapping or ticking
A
A
—
B
B
Squeaking or fizzing
A
Creaking
A
B
A
B
A
B
Drive belt (Slipping)
Idler pulley bearing operation
Squall Creak
A
B
—
B
A
B
Water pump noise
Water pump operation
A: Closely related
B: Related
Revision: June 2006
B
—
C: Sometimes related
B
—
EM-13
CO-17
—: Not related
EM-12
2007 Versa