Volkswagen New Beetle. Manual - part 39

 

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Volkswagen New Beetle. Manual - part 39

 

 

A chuckle that occurs on the driving phase is usually caused ive clearance due to differential gear wear, or by a 
damaged tooth on the coast side of the pinion or ring gear. Even a very small tooth nick or a ridge on the edge 
of a gear tooth is enough the cause the noise.  

This condition can be corrected simply by cleaning the gear tooth nick or ridge with a small grinding wheel. If 
either gear is damaged or scored badly, the gear set must be replaced. If metal has broken loose, the carrier and 
housing must be cleaned to remove particles that could cause damage.  

Knock 

This is very similar to a chuckle, though it may be louder, and occur on acceleration or deceleration. Knock can 
be caused by a gear tooth that is damaged on the drive side of the ring and pinion gears. Ring gear bolts that are 
hitting the carrier casting can cause knock. Knock can also be due to excessive end play in the axle shafts.  

Clunk 

Clunk is a metallic noise heard when an automatic transmission is engaged in Reverse or Drive, or when throttle 
is applied or released. It is caused by backlash somewhere in the driveline, but not necessarily in the axle. To 
determine whether driveline clunk is caused by the axle, check the total axle backlash as follows:  

1. Raise vehicle on a frame or twinpost hoist so that drive wheels are free. Clamp a bar between axle 

companion flange and a part of the frame or body so that flange cannot move.  

2. On conventional drive axles, lock the left wheel to keep it from turning. On all models, turn the right 

wheel slowly until it is felt to be in Drive condition. Hold a chalk marker on side of tire about 12" from 
center of wheel. Turn wheel in the opposite direction until it is again felt to be in Drive condition.  

3. Measure the length of the chalk mark, which is the total axle backlash. If backlash is one inch or less, 

drive axle is not the source of clunk noise.  

Bearing Whine 

Bearing whine is a high-pitched sound similar to a whistle. It is usually caused by malfunctioning pinion 
bearings. Pinion bearings operate at drive shaft speed. Roller wheel bearings may whine in a similar manner if 
they run completely dry of lubricant. Bearing noise will occur at all driving speeds. This distinguishes it from 
gear whine, which usually comes and goes as speed changes.  

Bearing Rumble 

Bearing rumble sounds like marbles being tumbled. It is usually caused by a malfunctioning wheel bearing. The 
lower pitch is because the wheel bearing turns at only about 1/3 of drive shaft speed.  

Chatter On Turns 

This is a condition where the entire front or rear of vehicle vibrates when vehicle is moving. The vibration is 
plainly felt as well as heard. Extra differential thrust washers installed during axle repair can cause a condition 
of partial lock-up that creates this chatter.  

Axle Shaft Noise 

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION Trouble Shooting - Basic Procedures

  

Axle shaft noise is similar to gear noise and pinion bearing whine. Axle shaft bearing noise will normally 
distinguish itself from gear noise by occurring in all driving modes (Drive, cruise, coast and float), and will 
persist with transmission in Neutral while vehicle is moving at problem speed.  

If vehicle displays this noise condition, remove suspect parts, replace wheel seals and install a new set of 
bearings. Re-evaluate vehicle for noise before removing any internal components.  

Vibration 

Vibration is a high-frequency trembling, shaking or grinding condition (felt or heard) that may be constant or 
variable in level and can occur during the total operating speed range of the vehicle.  

The types of vibrations that can be felt in the vehicle can d into 3 main groups:  

z

Vibrations of various unbalanced rotating parts of the vehicle.  

z

Resonance vibrations of the body and frame structures caused by rotating of unbalanced parts.  

z

Tip-in moans of resonance vibrations from stressed engine or exhaust system mounts or driveline flexing 
modes.  

DRIVE AXLE - RWD TROUBLE SHOOTING 

DRIVE AXLE (RWD) TROUBLE SHOOTING 

NOTE:

This is GENERAL information. This article is not intended to be specific to any 
unique situation or individual vehicle configuration. The purpose of this Trouble 
Shooting information is to provide a list of common causes to problem 
symptoms. For model-specific Trouble Shooting, refer to SUBJECT, 
DIAGNOSTIC, or TESTING articles available in the section(s) you are accessing. 
For definitions of listed noises or sounds, see DRIVE AXLE - NOISE DIAGNOSIS 
under POWERTRAIN. 

CONDITION & POSSIBLE CAUSE 

CORRECTION 

Knocking or Clunking 

Differential Side Gear Clearance 

Check Clearance 

Worn Pinion Shaft 

Replace Pinion Shaft 

Axle Shaft End Play 

Check End Play 

Missing Gear Teeth 

Check Differential/Replace Gear 

Wrong Axle Backlash 

Check Backlash 

Misaligned Driveline 

Realign Driveline 

Clinking During Engagement 

Side Gear Clearance 

Check Clearance 

Ring and Pinion Backlash 

Check Backlash 

Worn/Loose Pinion Shaft 

Replace Shaft/Bearing 

Bad "U" Joint 

Replace "U" Joint 

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION Trouble Shooting - Basic Procedures

  

FWD AXLE SHAFTS & CV JOINTS TROUBLE SHOOTING 

BASIC FWD AXLE SHAFTS & CV JOINTS TROUBLE SHOOTING CHART 

STEERING & SUSPENSION 

MANUAL STEERING GEAR TROUBLE SHOOTING 

Sticking Slip Yoke 

Lube Slip Yoke 

Broken Rear Axle Mount 

Replace Mount 

Loose Drive Shaft Flange 

Check Flange 

Click/Chatter On Turns 

Differential Side Gear Clearance 

Check Clearance 

Wrong Turn On Plates 

(1)

Replace Clutch Plates 

Wrong Differential Lubricant 

(1)

Change Lubricant 

Knock Or Click 

Flat Spot on Rear Wheel Bearing 

Replace Wheel Bearing 

Low Vibration At All Speeds 

Faulty Wheel Bearing 

Replace Wheel Bearing 

Faulty "U" Joint 

Replace "U" Joint 

Faulty Drive Shaft 

Balance Drive Shaft 

Faulty Companion Flange 

Replace Flange 

Faulty Slip Yoke Flange 

Replace Flange 

(1)

Limited slip differential only.

NOTE:

This is GENERAL information. This article is not intended to be specific to any 
unique situation or individual vehicle configuration. The purpose of this Trouble 
Shooting information is to provide a list of common causes to problem 
symptoms. For model-specific Trouble Shooting, refer to SUBJECT, 
DIAGNOSTIC, or TESTING articles available in the section(s) you are accessing. 

CONDITION 

POSSIBLE CAUSE 

Grease Leaks 

CV boot torn or cracked 

Clicking Noise on Cornering 

Damaged outer CV 

Clunk Noise on Acceleration 

Damaged inner CV 

Vibration or Shudder on 
Acceleration 

Sticking, damaged or worn CV Misalignment or 

spring height 

NOTE:

This is GENERAL information. This article is not intended to be specific to any 
unique situation or individual vehicle configuration. The purpose of this Trouble 
Shooting information is to provide a list of common causes to problem 

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION Trouble Shooting - Basic Procedures

  

BASIC MANUAL STEERING GEAR TROUBLE SHOOTING CHART 

symptoms. For model-specific Trouble Shooting, refer to SUBJECT, 
DIAGNOSTIC, or TESTING articles available in the section(s) you are accessing. 

CONDITION & POSSIBLE 
CAUSE 

CORRECTION 

Rattle or Chucking Noise in Rack and Pinion 

Rack and pinion mounting bracket 
loose 

Tighten all mounting bolts 

Lack of/or incorrect lubricant 

Correct as necessary 

Steering gear mounting bolts loose 

Tighten all mounting bolts 

Excessive Play 

Front wheel bearing improperly 
adjusted 

See FRONT SUSPENSION article 

Loose or worn steering linkage 

See STEERING LINKAGE article 

Loose or worn steering gear shift 

See MANUAL STEERING GEAR article 

Steering arm loose on gear shaft 

See MANUAL STEERING GEAR article 

Steering gear housing bolts loose 

Tighten all mounting bolts 

Steering gear adjustment too loose 

See MANUAL STEERING GEAR article 

Steering arms loose on knuckles 

Tighten and check steering linkage 

Rack and pinion mounting loose 

Tighten all mounting bolts 

Rack and pinion out of adjustment 

See adjustment in STEERING article 

Tie rod end loose 

Tighten and check steering linkage 

Excessive Pitman shaft-to-ball nut 
lash 

Repair as necessary 

Poor Returnability 

Lack of lubricant in ball joint or 
linkage 

Lubricate and service systems 

Binding in linkage or ball joints 

See STEERING LINKAGE and SUSPENSION 

article 

Improper front end alignment 

See WHEEL ALIGNMENT article 

Improper tire pressure 

Inflate to proper pressure 

Tie rod binding 

Inflate to proper pressure 

Shaft seal rubbing shaft 

See STEERING COLUMN article 

Excessive Vertical Motion 

Improper tire pressure 

Inflate to proper pressure 

Tires, wheels or rotors out of 
balance 

Balance tires then check wheels and rotors 

Worn or faulty shock absorbers 

Check and replace if necessary 

Loose tie rod ends or steering 

Tighten or replace if necessary 

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION Trouble Shooting - Basic Procedures

  

 

 

 

 

 

 

 

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