Nissan Xterra. Instruction — part 346

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

C

A

—

A

B

—

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

A

A

—

B

B

B

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

A

B

—

B

—

C

Drive belts
(Sticking
or slip-
ping)

Drive belts deflection

EM-13

Creaking

A

B

A

B

A

B

Drive belts
(Slipping)

Idler pulley bearing op-
eration

Squall
Creak

A

B

—

B

A

B

Water
pump
noise

Water pump operation

CO-21

Rattle

—

—

A

—

—

—

VTC

VTC lock pin clearance

EM-76

DRIVE BELTS

EM-13

< PERIODIC MAINTENANCE >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

PERIODIC MAINTENANCE

DRIVE BELTS

Exploded View

INFOID:0000000009484439

Checking Drive Belts

INFOID:0000000009484440

WARNING:

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

EM-24, "Removal and

Installation"

.

2. Make sure that the drive belt auto-tensioner indicator is within

the allowable working range (A) as shown.

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-13, "Removal and

Installation"

.

Adjustment

INFOID:0000000009484441

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

belt auto-tensioner.

Removal and Installation

INFOID:0000000009484442

REMOVAL

1. Remove air duct and resonator assembly. Refer to

EM-24, "Removal and Installation"

.

LBIA0427E

1.

Drive belt

2.

Power steering oil pump pulley

3.

Generator pulley

4.

Crankshaft pulley

5.

A/C compressor

6.

Cooling fan pulley

7.

Idler pulley

8.

Drive belt auto-tensioner

AWBIA0723ZZ

EM-14

< PERIODIC MAINTENANCE >

[VQ40DE]

DRIVE BELTS

2. Rotate the drive belt auto-tensioner in the direction of arrow

(loosening direction of tensioner) as shown, using suitable tool.

WARNING:

Avoid placing hand in a location where pinching may occur

if the tool accidentally comes off.

3. Remove the drive belt.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

Make sure belt is securely installed around all pulleys.

Drive Belt Auto-Tensioner and Idler Pulley

INFOID:0000000009484443

REMOVAL

1. Remove drive belt. Refer to

EM-13, "Removal and Installation"

.

2. Remove drive belt auto-tensioner and idler pulley.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

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

LBIA0428E

1.

Idler pulley

2.

Drive belt auto-tensioner

AWBIA0861GB

AIR CLEANER FILTER

EM-15

< PERIODIC MAINTENANCE >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

AIR CLEANER FILTER

Exploded View

INFOID:0000000009484444

Removal and Installation

INFOID:0000000009484445

REMOVAL

1. Remove the engine room cover (if equipped).
2. Disconnect air duct and resonator from the air cleaner case (upper).
3. Disconnect mass air flow sensor.
4. Unhook clips, and lift air cleaner case (upper).
5. Remove air cleaner filter.

INSTALLATION

Installation is in the reverse order of removal.

1.

Air cleaner case (lower)

2.

Air cleaner filter

3.

Air cleaner case (upper)

4.

Mass air flow sensor

5.

Air duct and resonator

Front

AWBIA1521ZZ