XLR V8-4.6L (2007)
Alignment: Service and Repair
Trim Height Inspection
Trim Height Inspection
Tools Required
*
J 42743 Trim Height Adjustment Tool
*
J 42854 Trim Height Measurement Gage
Trim Height Measurements
Trim height is a predetermined measurement relating to vehicle ride height. Incorrect trim heights can cause bottoming out over bumps, damage to the
suspension components and symptoms similar to wheel alignment problems. Check the trim heights when diagnosing suspension concerns and before
checking the wheel alignment.
Perform the following before measuring the trim heights:
1. Set the tire pressures to the pressure shown on the certification label. Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID
Label.
2. Check the fuel level. Add additional weight if necessary to simulate a full tank.
3. Make sure the rear compartment is empty except for the spare tire.
4. Make sure the vehicle is on a level surface, such as an alignment rack.
5. Close the doors.
6. Close the hood.
7. All dimensions are measured vertical to the ground. Trim heights should be within 13 mm (0.5 in) to be considered correct.
Z Height Measurement
Important: The Z height dimension measurement determines the proper ride height for the front end of the vehicle.
1. Lift the front bumper of the vehicle up about 38 mm (1.5 in).
2. Gently remove your hands.
3. Allow the vehicle to settle into position.
4. Repeat this jouncing operation 2 more times for a total of 3 times.
Z Height Measurement
5. Measure the distance between the lowest point of the ball joint (2) and the center of the front side of the lower control arm mounting bolt (1), using
the J 42854.
6. Push the front bumper of the vehicle down about 38 mm (1.5 in).
7. Gently remove your hands.
8. Allow the vehicle to rise.
9. Repeat the operation for a total of 3 times.
10. Measure the Z dimension from both the right and left side.
11. The true Z height dimension number is the average of the high and the low measurements. Refer to Trim Height Specifications.
Z Height Adjustment