Symptom Related Diagnostic Procedures

Tires show excess wear on edge of treads
Possible Source(s):
^ Tires under-inflated.
Action(s) to take:
^ Correct pressure to specification.

Possible Source(s):
^ Vehicle overloaded.
Action(s) to take:
^ Correct as required.

Tires show excess wear on edge of treads (having the correct tire pressures)
Possible Source(s):
^ Incorrect toe setting.
Action(s) to take:
^ Set to specification.

Tires show excess wear in center of tread
Possible Source(s):
^ Tires over-inflated.
Action(s) to take:
^ Correct pressure to specification.

Other excessive tire wear problems
Possible Source(s):
^ Incorrect tire pressure.
Action(s) to take:
^ Correct pressure to specification.

Possible Source(s):
^ Incorrect tire and wheel usage.
Action(s) to take:
^ Install correct tire and wheel combination.

Possible Source(s):
^ Loose or leaking air springs.
Action(s) to take:
^ Tighten or install new air springs as necessary.

Possible Source(s):
^ Geometry out of alignment.
Action(s) to take:
^ Check and adjust.
Possible Source(s):
^ Loose, worn or damaged suspension components.
Action(s) to take:
^ Inspect, repair or install new suspension components as necessary.

Possible Source(s):
^ Wheel and tire assembly out of balance.

Action(s) to take:
^ Balance wheel and tire assembly.

Possible Source(s):
^ Excessive lateral or radial runout of wheel or tire.
Action(s) to take:
^ Check, repair or install a new wheel or tire as necessary.

Wheel mounting is difficult
Possible Sources (s):
^ Incorrect application or mismatched parts, including wheel studs and wheel nuts. Corroded, worn or damaged parts.

Action(s) to take:
^ Clean or install a new part.

Wobble or shimmy affecting wheel runout
Possible Sources (s):
^ Damaged wheel (eventually damaging wheel bearings and causing uneven tire wear).
Action(s) to take:
^ Inspect wheel rims for damage and runout. Install a new wheel rim as necessary.

Excessive vibration, rough steering or severe tire wear
Possible Sources (s):
^ Loose or incorrect attaching parts.
Action(s) to take:
^ Tighten or install new parts.

Vehicle vibrations
Possible Sources (s):
^ Tires and wheels mismatched.
Action(s) to take:
^ Install correct tire and wheel combination.

Possible Sources (s):
^ Inflation pressure too high or too low.
Action(s) to take:
^ Correct pressure to specification.

Possible Sources (s):
^ Uneven tire wear.
Action(s) to take:
^ Refer to Diagnosis and Testing.

Possible Sources (s):
^ Out-of-balance wheel, tire, wheel hub or disc assembly.
Action(s) to take:
^ Determine the out-of-balance component and balance or install anew part.

Possible Sources (s):
^ Damaged or distorted wheel from road impact hazard or incorrect handling.
Action(s) to take:
^ Install a new wheel.

Possible Sources (s):
^ Excessive radial runout.
Action(s) to take:
^ Install anew wheel or tire. Check for incorrect wheel and tire specifications.

Possible Sources (s):
^ Excessive lateral runout.
Action(s) to take:
^ Install anew wheel or tire.

Possible Sources (s):
^ Incorrectly seated tire.
Action(s) to take:
^ Remount the tire.

Possible Sources (s):
^ Loose wheel mountings damaged wheel studs, wheel nuts, worn or broken wheel hub face or foreign material on mounting faces.
Action(s) to take:
^ Tighten or install new parts. Clean mounting surfaces.

Possible Sources (s):
^ Defective wheel bearings.
Action(s) to take:
^ Install a new bearing set.

Possible Sources (s):
^ Brake disc imbalance.
Action(s) to take:
^ For additional information refer to Brake

Possible Sources (s):
^ Water in tires.
Action(s) to take:
^ Remove water.

Possible Sources (s):
^ Loose engine or transmission mounts.
Action(s) to take:
^ Tighten or install a new mount.

Possible Sources (s):
^ Incorrect front end alignment.
Action(s) to take:
^ Align front end.

Possible Sources (s):
^ Loose or worn driveline or suspension parts.
Action(s) to take:
^ Repair or install new parts.

Possible Sources (s):
^ Excessive driveshaft runout or imbalance.
Action(s) to take:
^ Install a new driveshaft.

Possible Sources (s):
^ Worn or damaged flexible drive joint.
Action(s) to take:
^ Install a new driveshaft.

Damaged wheel hub stud threads
Possible Sources (s):
Tires show excess wear on edge of treads
^ Sliding wheel across the wheel studs during installation. Loose wheel nuts.
Action(s) to take:
^ Install new wheel studs.

Broken wheel studs
Possible Sources (s):
^ Loose or overtightened wheel nuts.
Action(s) to take:
^ Install new wheel studs.

Corrosion and contamination streaks from the wheel hub wheel stud holes
Possible Sources (s):
^ Loose wheel nuts.
Action(s) to take:
^ Check complete assembly. Install new parts. Follow correct torque procedure.

Damaged wheel nuts
Possible Sources (s):
^ Loose wheel assembly.
Action(s) to take:
^ Install new wheel nuts. Follow correct torque procedure.

Possible Sources (s):
^ Over-tightened wheel nuts.
Action(s) to take:
^ Install new wheel nuts. Follow correct torque procedure.

Frozen wheel nuts
Possible Sources (s):
^ Corrosion or galling.
Action(s) to take:
^ If corrosion is light, wire brush away corrosion. If corrosion is excessive install new wheel studs and wheel nuts.