Chevrolet Workshop Manuals
Lumina APV V6-191 3.1L (1990)
Steering and Suspension > Alignment > System Information > Technical Service Bulletins > Steering/Suspension - Wheel Alignment Specifications > Page 4367
available, measurements may also be clearly and legibly handwritten into the Wheel Alignment Repair Order Questionnaire attached to this
4. Attach the Wheel Alignment Repair Order Questionnaire below along with the print-out of "Before" and "After" wheel alignment measurements to
the Repair Order and retain for use by GM.
Wheel Alignment Equipment and Process
Wheel alignments must be performed with a quality machine that will give accurate results when performing checks. "External Reference" (image-based
Computerized four wheel alignment system.
Computer capable of printing before and after alignment reports.
Computer capable of time and date stamp printout.
Racking system must have jacking capability
Racking system must be capable of level to 1.6 mm (1/16 in)
Appropriate wheel stops and safety certification
Built-in turn plates and slip plates
Wheel clamps capable of attaching to 20" or larger wheels
Racking capable of accepting any GM passenger car or light duty truck
Operator properly trained and ASE-certified (U.S. only) in wheel alignment
Racking should have front and rear jacking capability.
Equipment Maintenance and Calibration:
Alignment machines must be regularly calibrated in order to give correct information. Most manufacturers recommend the following:
Alignment machines with "internal reference" sensors should be checked (and calibrated, if necessary) every six months.
Alignment machines with "external reference" (image-based camera technology) should be checked (and calibrated, if necessary) once a year.
Racks must be kept level to within 1.6 mm (1/16 in).
If any instrument that is part of the alignment machine is dropped or damaged in some way, check the calibration immediately.
Check with the manufacturer of your specific equipment for their recommended service/calibration schedule.
Wheel Alignment Process
When performing wheel alignment measurement and/or adjustment, the following steps should be taken:
1. Verify that the vehicle has a full tank of fuel (compensate as necessary).
Satisfactory vehicle operation may occur over a wide range of alignment angles. However, if the wheel alignment angles are not within the range of
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