DESCRIPTION AND OPERATION
Noise, Vibration and Harshness (NVH)
Diagnostic Theory
Know the System
Know the History of the System
Know the History of the Condition
Know the Probability of Certain Conditions Developing
Do Not Cure the Symptom and Leave the Cause
Be Positive the Cause Is Found
Diagnosis Charts
DIAGNOSIS AND TESTING
Inspection and Verification
How to Use this Diagnostic Procedure Section
Customer Interview
Identifying the Condition
Noise Diagnostic Procedure
Non-Axle Noise
Noise Conditions
Vibration Conditions
Harshness Conditions
Leakage Conditions/Low Lube Level
Road Test
Neutral Engine Run-Up Test (NERU)
Drive Engine Run-Up Test (DERU)
Road Test Quick Checks
Road Conditions
Vehicle Preparation
Hoist Test
Symptom Charts
Pinpoint Tests
Components Tests
Noise or Vibration, 4-Wheel Drive Vehicles
Axle Pitch Line Runout and/or Boom
Hub Bearing, Rear
Analysis of Gear Noise
GLOSSARY OF TERMS
Terms
Acceleration
Ambient Temperature
Articulation
Belt Chirp
Belt Squeal
Boom
Bound Up
Brakes Applied
Camber
Caster
Chatter
Chuckle
Clunk
Coast/Deceleration
Coast/Neutral Coast
Controlled Rear Suspension Height
Coupling Shaft
CPS
Cruise
Deceleration
Driveline Angles
Driveshaft
Drivetrain
Drivetrain Damper
Engine Imbalance
Engine Misfire
Engine Run-Up Test
Flexible Coupling
Float
Gravelly Feel
Harshness
Hose Clamp
Hz
Imbalance
Inboard
In-Phase
Isolate
Knock
Neutralize (Normalize)
NVH
Outboard
Pinion Shaft
Pumping Feel
Radial/Lateral
Ring Gear
Runout
Shake
Slip-Yoke (Slip-Spline)
Tip-In Moan
T.I.R.
Tire Deflection
Tire Force Vibration
Tires — Flat Spots
Two-Plane Balance
Vibration
ADJUSTMENTS
Balancing, Brake Drum
Balancing, Driveshaft
Match Mounting Tires
Wheels, Distorted
SERVICE PROCEDURES
Engine/Transmission Mounts, Neutralizing
Exhaust System, Neutralizing
SPECIAL SERVICE TOOLS /EQUIPMENT
