Infiniti G35 (V35) Sedan. Manual - part 601

 

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Infiniti G35 (V35) Sedan. Manual - part 601

 

 

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

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< SYMPTOM DIAGNOSIS >

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SYMPTOM DIAGNOSIS

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

NVH Troubleshooting - Engine Noise

INFOID:0000000000956210

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

INFOID:0000000000956211

1.

Locate the area where noise occurs.

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EM-4

< SYMPTOM DIAGNOSIS >

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

2.

Confirm the type of noise.

3.

Specify the operating condition of the 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-17

Rattle

C

A

A

B

C

Camshaft 
bearing 
noise

Camshaft runout
Camshaft journal oil 
clearance

EM-142
EM-142

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-146

EM-151

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-146

EM-146

EM-146
EM-151

Knock

A

B

C

B

B

B

Connect-
ing rod 
bearing 
noise

Connecting rod bushing 
oil clearance
Connecting rod bearing 
oil clearance 

EM-151

EM-151

Knock

A

B

A

B

C

Main bear-
ing noise

Main bearing oil clear-
ance
Crankshaft runout

EM-150

EM-146

Front of 
engine
Timing 
chain case

Tapping or 
ticking

A

A

B

B

B

Timing 
chain and 
timing 
chain ten-
sioner 
noise

Timing chain cracks 
and wear
Timing chain tensioner 
operation

EM-63

EM-49

Front of 
engine

Squeak-
ing or fizz-
ing

A

B

B

C

Drive belts 
(Sticking 
or slip-
ping)

Drive belts deflection

EM-12

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-19, 

"Exploded 

View"

PRECAUTIONS

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< PRECAUTION >

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PRECAUTION

PRECAUTIONS

Precaution for Procedure without Cowl Top Cover

INFOID:0000000000956212

When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.

Precaution Necessary for Steering Wheel Rotation after Battery Disconnect

INFOID:0000000000956213

NOTE:
• Before removing and installing any control units, first turn the push-button ignition switch to the LOCK posi-

tion, then disconnect both battery cables.

• After finishing work, confirm that all control unit connectors are connected properly, then re-connect both

battery cables.

• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.

If a DTC is detected, perform trouble diagnosis according to self-diagnosis results.

This vehicle is equipped with a push-button ignition switch and a steering lock unit.
If the battery is disconnected or discharged, the steering wheel will lock and cannot be turned.
If turning the steering wheel is required with the battery disconnected or discharged, follow the procedure
below before starting the repair operation.

OPERATION PROCEDURE

1.

Connect both battery cables.
NOTE:
Supply power using jumper cables if battery is discharged.

2.

Carry the Intelligent Key or insert it to the key slot and turn the push-button ignition switch to ACC position.
(At this time, the steering lock will be released.)

3.

Disconnect both battery cables. The steering lock will remain released with both battery cables discon-
nected and the steering wheel can be turned.

4.

Perform the necessary repair operation.

5.

When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn
the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering
wheel will lock when the push-button ignition switch is turned to LOCK position.)

6.

Perform self-diagnosis check of all control units using CONSULT-III.

Draining Engine Coolant

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Drain engine coolant and engine oil when the engine is cooled.

Disconnecting Fuel Piping

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• Before starting work, make sure no fire or spark producing items are in the work area. 
• Release fuel pressure before disconnecting and disassembly.
• After disconnecting pipes, plug openings to stop fuel leakage.

Removal and Disassembly

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• When instructed to use SST, use specified tools. Always be careful to work safely, avoid forceful or unin-

structed operations. 

PIIB3706J

EM-6

< PRECAUTION >

PRECAUTIONS

• Exercise maximum care to avoid damage to mating or sliding surfaces.
• Dowel pins are used for several parts alignment. When replacing and reassembling parts with dowel pins,

make sure that dowel pins are installed in the original position.

• Cover openings of engine system with a tape or equivalent, if necessary, to seal out foreign materials.
• Mark and arrange disassembly parts in an organized way for easy troubleshooting and re-assembly.
• When loosening nuts and bolts, as a basic rule, start with the one furthest outside, then the one diagonally

opposite, and so on. If the order of loosening is specified, do exactly as specified. Power tools may be used
in the step.

Inspection, Repair and Replacement

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Before repairing or replacing, thoroughly inspect parts. Inspect new replacement parts in the same way, and
replace if necessary.

Assembly and Installation

INFOID:0000000000956218

• Use torque wrench to tighten bolts or nuts to specification.
• When tightening nuts and bolts, as a basic rule, equally tighten in several different steps starting with the

ones in center, then ones on inside and outside diagonally in this order. If the order of tightening is specified,
do exactly as specified.

• Replace with new gasket, packing, oil seal or O-ring.
• Thoroughly wash, clean, and air-blow each part. Carefully check engine oil or engine coolant passages for

any restriction and blockage. 

• Avoid damaging sliding or mating surfaces. Completely remove foreign materials such as cloth lint or dust.

Before assembly, oil sliding surfaces well. 

• Release air within route when refilling after draining engine coolant. 
• After repairing, start the engine and increase engine speed to check engine coolant, fuel, engine oil, and

exhaust gases for leakage.

Parts Requiring Angle Tightening

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• Use the angle wrench [SST: KV10112100 (BT8653-A)] for the final tightening of the following engine parts: 
- Cylinder head bolts
- Lower cylinder block bolts
- Connecting rod cap bolts
• Do not use a torque value for final tightening. 
• The torque value for these parts are for a preliminary step.
• Ensure thread and seat surfaces are clean and coated with engine oil. 

Liquid Gasket

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REMOVAL OF LIQUID GASKET SEALING

• After removing mounting nuts and bolts, separate the mating sur-

face using the seal cutter [SST:KV10111100 (J37228)] (A) and
remove old liquid gasket sealing.

CAUTION:

Be careful not to damage the mating surfaces.

• Tap the seal cutter [SST: KV10111100 (J37228)] to insert it (B), and

then slide it (C) by tapping on the side as shown in the figure.

• In areas where the seal cutter [SST: KV10111100 (J37228)] is diffi-

cult to use, use a plastic hammer to lightly tap the parts, to remove
it.

CAUTION:

If for some unavoidable reason tool such as a screwdriver is
used, be careful not to damage the mating surfaces.

LIQUID GASKET APPLICATION PROCEDURE

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