G8 V8-6.0L (2009)
Alignment: Service and Repair
Wheel Alignment Measurement
Wheel Alignment Measurement
Important: Steering and vibration concerns are not always the result of incorrect alignment. Other causes could include:
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Wheel and Tire imbalance. Refer to Tire and Wheel Assembly Balancing - Off Vehicle (See: Testing and Inspection/Symptom Related
Diagnostic Procedures/Vibration Diagnosis and Correction/Repair Instructions/Tire and Wheel Assembly Balancing - Off Vehicle) or Tire and
Wheel Assembly Balancing - On-Vehicle (See: Testing and Inspection/Symptom Related Diagnostic Procedures/Vibration Diagnosis and
Correction/Repair Instructions/Tire and Wheel Assembly Balancing - On-Vehicle)
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Tire lead due to wear, incorrectly manufactured or incorrectly mounted tires. Refer to Radial Tire Lead/Pull Correction (See: Wheels and
Tires/Testing and Inspection/Symptom Related Diagnostic Procedures/Radial Tire Lead/Pull Correction).
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Before performing any adjustments affecting wheel alignment, perform the following inspections and adjustments in order to ensure correct
alignment readings.
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Inspect tires for correct inflation. Refer to Tire Inflation Pressure Specifications (See: Wheels and Tires/Tires/Specifications).
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Inspect tires for irregular wear. Refer to Tire Diagnosis - Irregular or Premature Wear (See: Wheels and Tires/Testing and Inspection/Symptom
Related Diagnostic Procedures/Tire Diagnosis - Irregular or Premature Wear).
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Inspect the run out of the wheels and tires. Refer to Tire and Wheel Assembly Runout Measurement - On-Vehicle (See: Testing and
Inspection/Symptom Related Diagnostic Procedures/Vibration Diagnosis and Correction/Diagnostic Information and Procedures/Tire and Wheel
Assembly Runout Measurement - On-Vehicle).
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Inspect the wheel hub end float.
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For front wheel hub Refer to Front Wheel Hub Assembly Inspection (See: Steering and Suspension/Suspension/Testing and
Inspection/Component Tests and General Diagnostics/Front Wheel Hub Assembly Inspection)
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For rear wheel hub Refer to Rear Wheel Hub Assembly Inspection (See: Steering and Suspension/Suspension/Testing and
Inspection/Component Tests and General Diagnostics/Rear Wheel Hub Assembly Inspection)
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Inspect the front suspension and steering ball joints for wear and damage. Refer to Ball Joint Inspection (See: Steering and
Suspension/Suspension/Testing and Inspection/Component Tests and General Diagnostics/Ball Joint Inspection).
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Inspect the suspension control arms and stabilizer bar for wear and damage.
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Inspect the steering gear for looseness.
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Inspect the struts/shock absorbers for wear and damage. Refer to Suspension Strut and Shock Absorber Testing - On Vehicle (See: Steering and
Suspension/Suspension/Testing and Inspection/Component Tests and General Diagnostics/Suspension Strut and Shock Absorber Testing - On
Vehicle).
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Inspect the vehicle trim height. Refer to Trim Height Inspection (See: Steering and Suspension/Suspension/Testing and Inspection/Component
Tests and General Diagnostics/Trim Height Inspection).
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Inspect the steering wheel for excessive drag or poor return due to stiff or binding suspension components.
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Inspect the fuel level. The fuel tank should be full or the vehicle should have compensating load added.
Important: Give consideration to excess loads such as tool boxes, sample cases, etc. If normally carried in the vehicle, these items should
remain in the vehicle during the alignment adjustments. Give consideration also to the condition of the equipment being used for the
alignment. Follow the equipment manufacturer's instructions.
Perform the following steps to measure the front and rear alignment angles:
Important: Satisfactory vehicle operation may occur over a wide range of alignment settings. However, if the settings are not within the
allowable specifications, correct the alignment to the correct specifications. Refer to Wheel Alignment Specifications (See: Specifications)
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1. Install the alignment equipment according to the manufacturer's instructions.
2. Bounce the front and rear bumpers 3 times prior to checking the wheel alignment.
3. Measure the alignment angles and record the readings.
Important: When performing adjustments to vehicles requiring a four wheel alignment, set the rear wheel alignment angles first in order
to obtain the correct front alignment angles.
4. Adjust alignment angles to vehicle specifications, if necessary. Refer to Wheel Alignment Specifications (See: Specifications).