Nissan Pathfinder. Manual — part 543

NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING

EM-11

< SYSTEM DESCRIPTION >

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. Repair or replace the identified part as necessary.

A: Closely related B: Related C: Sometimes related —: Not related

Timing chain and chain
tensioner noise

Drive belt noise (Sticking/Slipping)

Tappet noise

Valve

Valve mechanism

Rotation mechanism

Drive belt

Timing chain

Location

of noise

Type of

noise

Operating condition of engine

Source of

noise

Check item

Refer-

ence page

Before

warm-

After

warm-

When

start-

ing

When

idling

When

racing

While

driving

Top of en-
gine
Rocker
cover
Cylinder
head

Ticking or
clicking

—

Tappet
noise

Valve clearance

EM-18

Rattle

—

Camshaft
bearing
noise

Camshaft journal clear-
ance
Camshaft runout

EM-75

Crank-
shaft pul-
ley
Cylinder
block
(Side of
engine)
Oil pan

Slap or
knock

—

Piston pin
noise

Piston and piston pin
clearance
Connecting rod bushing
clearance

EM-22

Slap or
rap

—

Piston
slap noise

Piston-to-bore clear-
ance
Piston ring side clear-
ance
Piston ring end gap
Connecting rod bend
and torsion

EM-112

Knock

Connect-
ing rod
bearing
noise

Connecting rod bushing
clearance (Small end)
Connecting rod bearing
clearance (Big end)

EM-112

Knock

—

Main bear-
ing noise

Main bearing oil clear-
ance
Crankshaft runout

EM-112

Front of
engine
Timing
chain cov-
er

Tapping or
ticking

—

Timing
chain and
chain ten-
sioner
noise

Timing chain cracks
and wear
Timing chain tensioner
operation

EM-62

Front of
engine

Squeak-
ing or fizz-
ing

—

Drive belts
(Sticking
or slip-
ping)

Drive belts deflection

EM-12

Creaking

Drive belts
(Slipping)

Idler pulley bearing op-
eration

Squall
Creak

—

Water
pump
noise

Water pump operation

CO-19

EM-12

< PERIODIC MAINTENANCE >

DRIVE BELT

PERIODIC MAINTENANCE

DRIVE BELT

Exploded View

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Checking Drive Belt

INFOID:0000000009177886

WARNING:

Inspect and check the drive belt with the engine off.
1. Visually check entire drive belt for wear, damage or cracks.
2. Check that the drive belt auto-tensioner indicator is within the possible use range.

NOTE:

• When new drive belt is installed, the drive belt auto-tensioner indicator should be within the new drive

belt range.

• Check the drive belt auto-tensioner indicator when the engine is cold.

3. If the drive belt auto-tensioner indicator is out of the possible use range or drive belt is damaged, replace

drive belt.

Tension Adjustment

INFOID:0000000009177887

• Drive belt tension is automatically adjusted by the drive belt auto-tensioner.

• Drive belt tension is not manually adjustable.

Removal and Installation

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REMOVAL

1. Remove the front wheel and tire (RH) using a power tool. Refer to

WT-58, "Adjustment"

2. Remove the fender protector side cover (RH). Refer to

EXT-28, "FENDER PROTECTOR : Exploded

View"

Drive belt auto-tensioner

Generator

A/C compressor

Drive belt

Crankshaft pulley

Drive belt auto-tensioner indicator

New drive belt range

Possible use range

View D

Engine front

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DRIVE BELT

EM-13

< PERIODIC MAINTENANCE >

3. While securely holding the hexagonal part in pulley center of

drive belt auto-tensioner, move in the direction of arrow (loosen-

ing direction of drive belt auto-tensioner) using suitable tool.

WARNING:

• Avoid placing hand in a location where pinching may

occur if the holding tool accidentally comes off.

CAUTION:

• Do not loosen the drive belt auto-tensioner pulley bolt.

(Do not turn it counterclockwise. If turned counterclock-

wise, the complete drive belt auto-tensioner must be

replaced as a unit, including pulley.)

4. Insert a rod approximately 6 mm (0.24 in) in diameter through

the rear of drive belt auto-tensioner into retaining boss to lock drive belt auto-tensioner pulley.

NOTE:

Leave drive belt auto-tensioner pulley arm locked until drive belt is installed.

5. Remove drive belt from crankshaft pulley and then remove it from the other pulleys.

INSTALLATION

1. Install the drive belt onto all of the pulleys.

CAUTION:

Confirm belt is completely set on the pulleys.
2. Release drive belt auto-tensioner, and apply tension to drive belt.

WARNING:

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

comes off.

CAUTION:

• Do not loosen the drive belt auto-tensioner pulley bolt. (Don't turn it counterclockwise. If turned

counterclockwise, the complete drive belt auto-tensioner must be replaced as a unit, including

pulley.)

3. Turn crankshaft pulley clockwise several times to equalize tension between each pulley.
4. Confirm drive belt auto-tensioner indicator is within the possible use range. Refer to

EM-12, "Checking

Drive Belt"

5. Install the fender protector side cover (RH). Refer to

EXT-28, "FENDER PROTECTOR : Exploded View"

6. Install the front wheel and tire (RH) using a power tool. Refer to

WT-58, "Adjustment"

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