Nissan Frontier. Instruction — part 706

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

EM-13

< SYSTEM DESCRIPTION >

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Use the Chart Below to Help You Find the Cause of the Symptom

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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.

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

C

A

—

A

B

—

Tappet
noise

Valve clearance

EM-108

Rattle

C

A

—

A

B

C

Camshaft
bearing
noise

Camshaft journal oil
clearance
Camshaft runout

EM-54
EM-54

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-91
EM-91

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-91
EM-91
EM-91
EM-91

Knock

A

B

C

B

B

B

Connect-
ing rod
bearing
noise

Connecting rod bushing
oil clearance
Connecting rod bearing
oil clearance

EM-91
EM-91

Knock

A

B

—

A

B

C

Main bear-
ing noise

Main bearing oil clear-
ance
Crankshaft runout

EM-91
EM-91

Front of
engine
Front cov-
er

Tapping or
ticking

A

A

—

B

B

B

Timing
chain and
chain ten-
sioner
noise

Timing chain cracks
and wear
Timing chain tensioner
operation

EM-46
EM-46

Front of
engine

Squeak-
ing or fizz-
ing

A

B

—

B

—

B

Drive belt
(Sticking
or slip-
ping)

Drive belt deflection

EM-14

Creaking

A

B

A

B

A

B

Drive belt
(Slipping)

Idler pulley bearing op-
eration

Squall
Creak

A

B

—

B

A

B

Water
pump
noise

Water pump operation

CO-21

EM-14

< PERIODIC MAINTENANCE >

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DRIVE BELTS

PERIODIC MAINTENANCE

DRIVE BELTS

Exploded View

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Checking Drive Belts

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WARNING:

Be sure to perform when the engine is stopped.
1. Remove air duct and resonator assembly when inspecting drive belt. Refer to

EM-141, "Removal and

Installation"

.

2. Make sure that the auto-tensioner indicator is within the allowable working range.
3. Visually check entire belt for wear, damage or cracks.
4. If the indicator is out of allowable working range or drive belt is damaged, replace the drive belt. Refer to

EM-129, "Removal and Installation"

.

Adjustment

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There is no instruction drive belt tension adjustment. The drive belt tension is automatically adjusted by the drive

belt auto-tensioner.

Removal and Installation

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REMOVAL

1.

Drive belt

2.

Power steering oil pump pulley

3.

Generator pulley

4.

Crankshaft pulley

5.

A/C compressor

6.

Idler pulley

7.

Water pump

8.

Idler pulley

9.

Drive belt auto- tensioner

A.

Allowable working range

LBIA0438E

DRIVE BELTS

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1. Install Tool on auto-tensioner pulley bolt and move in the direc-

tion of arrow (loosening direction of tensioner).

WARNING:

• Avoid placing hand in a location where pinching may

occur if the holding tool accidentally comes off.

CAUTION:

• Do not loosen the auto-tensioner pulley bolt. (Do not turn

it counterclockwise.) If turned counterclockwise, the com-

plete auto-tensioner must be replaced as a unit, including

pulley.

2. Remove drive belt.

INSTALLATION

Installation is in the reverse order of removal.

WARNING:

• Avoid placing hand in a location where pinching may occur if the holding tool accidentally comes

off.

CAUTION:

• Do not loosen the auto-tensioner pulley bolt. (Do not turn it counterclockwise.) If turned counter-

clockwise, the complete auto-tensioner must be replaced as a unit, including pulley.

• Confirm belts are completely set on the pulleys.

• Check that there is no engine oil or engine coolant on the drive belt or pulley grooves.

NOTE:

• Turn crankshaft pulley clockwise several times to equalize tension between each pulley.

• Confirm tension of drive belt indicator (fixed side) is within the allowable working range.

Removal and Installation of Drive Belt Auto-Tensioner

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REMOVAL

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-

ing.
1. Disconnect battery negative terminal. Refer to

PG-83, "Removal and Installation"

.

2. Partially drain engine coolant. Refer to

CO-12, "Changing Engine Coolant"

.

3. Remove air cleaner and air duct. Refer to

EM-25, "Removal and Installation"

.

4. Remove drive belt. Refer to

EM-14, "Removal and Installation"

.

5. Disconnect upper radiator hose from radiator.

Tool number

: — (J-46535)

LBIA0439E

LBIA0440E

EM-16

< PERIODIC MAINTENANCE >

[QR25DE]

DRIVE BELTS

6. Disconnect coolant reservoir hose from radiator.
7. Remove lower and upper shrouds. Refer to

CO-16, "Exploded View"

.

8. Remove the power steering oil pump and position aside. Refer to

ST-18, "Removal and Installation"

.

9. Remove generator. Refer to

CHG-28, "Removal and Installation - QR25DE Models"

.

10. Remove drive belt auto-tensioner.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

If there is damage greater than peeled paint, replace drive belt auto-tensioner.