Nissan Sentra B18 (2020-2025) Service Manual: Noise, Vibration and Harshness (nvh) Troubleshooting

1.

Timing chain

2.

Water pump

3.

Drive belt

A.

Tappet noise

B.

Camshaft bearing noise

C.

Piston pin noise

D.

Connecting rod bearing noise

E.

Piston slap noise

F.

Rotation mechanism

G.

Main bearing noise

H.

Timing chain and chain tensioner noise

J.

Water pump noise

K.

Drive belt noise

L.

Valve mechanism

Top of engine

Rocker cover

Cylinder head

Ticking or clicking

C

A

—

A

B

—

Tappet noise

Valve clearance

Inspection and Adjustment

Rattle

C

A

—

A

B

C

Camshaft bearing noise

Camshaft journal oil clearance

Camshaft runout

Camshaft

Crankshaft pulley

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

Cylinder Block

Slap or rap

A

—

—

B

B

A

Piston slap noise

Piston to cylinder bore clearance

Piston ring side clearance

Piston ring end gap

Connecting rod bend and torsion

Cylinder Block

Knock

C

A

—

B

A

B

Connecting rod bearing noise

Connecting rod bushing oil clearance

Connecting rod bearing oil clearance

Cylinder Block

Connecting Rod Bearing

Knock

C

A

—

B

A

B

Main bearing noise

Main bearing oil clearance

Crankshaft runout

Main Bearing

Cylinder Block

Front of engine

Front cover

Tapping or ticking

A

A

A

B

A

B

Timing chain and chain tensioner noise

Timing chain cracks and wear

Timing chain tensioner operation

Inspection

Exploded View

Front of engine

Squall

Creak

—

A

—

A

C

C

Water pump noise

Water pump operation

Replace water pump