SMU - Revised Front Caster and Camber Adjustment Procedure #02-03-07-002 - (10/04/2002)
Revised Front Caster and Camber Adjustment Procedure
1999-2000 Cadillac Escalade
2002-2003 Cadillac Escalade, Escalade EXT
1999-2003 Chevrolet Express, Silverado, Tahoe, Suburban
2002-2003 Chevrolet Avalanche
1999 GMC Suburban
1999-2003 GMC Savana, Sierra, Yukon, Yukon XL, Yukon XL Denali
2003 HUMMER H2
This bulletin is being issued to revise the Front Caster and Camber Adjustment procedure in the Wheel Alignment sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information.
The following information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.
Front Caster and Camber Adjustment (Cadillac Escalade; Chevrolet Avalanche, Silverado, Tahoe, Suburban; GMC Sierra, Suburban, Yukon; HUMMER H2)
Important
Caster measurements or values must be compensated for the measured frame angle.
Caster is relative to frame. The caster values must be compensated for the measured frame angle by using a digital protractor or equivalent on a flat portion of the frame in front of the rear tire.
Frame angle is positive when higher in the rear. Measure both sides of the frame and take an average from those measurements. Then add the average frame angle to the caster reading when making adjustments.
Frame angle is negative when lower in the rear. Measure both sides of the frame and take an average from the measurements. Then subtract the average frame angle from the caster reading when making adjustments.
The caster and camber adjustments are made by rotating the offset cam bolt and the cam in the slotted frame bracket in order to reposition the control arm.
Important
Before adjusting the caster and camber angles, jounce the front bumper three times to allow the vehicle to return to normal height.
Measure and adjust the caster and the camber with the vehicle at curb height. The front suspension Z dimension is indicated in Trim Heights. Refer to Trim Height Inspection Procedure in Suspension General Diagnosis.
For an accurate reading, do not push or pull on the tires during the alignment process.
Determine the caster angle (2). Be sure to compensate for frame angle where required.
Determine the positive camber (2) or negative camber (3) angle.
Remove the pinned adjusting cam insert. Do not reinstall the cam insert.
Loosen the upper control arm cam adjustment bolts.
Notice
Refer to Fastener Notice in Cautions and Notices.
Adjust the caster and the camber angle by turning the cam bolts until the specifications have been met. When the adjustments are complete, hold the cam bolt head in order to ensure the cam bolt position does not change while tightening the nut. Tighten
Tighten the cam nuts to 190 N·m (140 lb ft).
Verify that the caster and the camber are still within specifications. Refer to Wheel Alignment Specifications. When the caster and camber are within specifications, adjust the toe. Refer to Front Toe Adjustment.
Front Caster and Camber Adjustment (Chevrolet Express; GMC Savana)
Important
Caster measurements or values must be compensated for the measured frame angle.
Caster is relative to frame. The caster values must be compensated for the measured frame angle. Determine the frame angle by positioning a digital protractor or equivalent between the transmission support (2) and the #3 body mount (3) and obtaining a frame angle measurement.
Frame angle is positive when higher in the rear. Measure both sides of the frame and take an average from those measurements. Then add the average frame angle to the caster reading when making adjustments.
Frame angle is negative when lower in the rear. Measure both sides of the frame and take an average from the measurements. Then subtract the average frame angle from the caster reading when making adjustments.
The caster and camber adjustments are made by rotating the offset cam bolt and the cam in the slotted frame bracket in order to reposition the control arm.
Important
Before adjusting the caster and camber angles, jounce the front bumper three times to allow the vehicle to return to normal height.
Measure and adjust the caster and the camber with the vehicle at curb height. The front suspension Z dimension is indicated in Trim Heights. Refer to Trim Height Inspection Procedure in Suspension General Diagnosis.
For an accurate reading, do not push or pull on the tires during the alignment process.
Determine the caster angle (2) .
Determine the positive camber (2) or negative camber (3) angle.
Remove the pinned adjusting cam insert. Do not reinstall the cam insert.
Loosen the upper control arm cam adjustment bolts.
Notice
Refer to Fastener Notice in Cautions and Notices.
Adjust the caster and the camber angle by turning the cam bolts until the specifications have been met. When the adjustments are complete, hold the cam bolt head in order to ensure the cam bolt position does not change while tightening the nut. Tighten
Tighten the upper control arm nuts to 175 N·m (129 lb ft).
Verify that the caster and the camber are still within specifications. Refer to Wheel Alignment Specifications. When the caster and camber are within specifications, adjust the toe. Refer to Front Toe Adjustment.