i-290 4WD L4-2.9L (2007)
Alignment: Testing and Inspection
Trim Height Inspection
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. Make sure the vehicle is on a level surface, such as a alignment rack.
2. Remove the alignment rack floating pins.
3. Set the tire pressures to the pressure shown on the certification label. Refer to Label - Vehicle Certification, Tire Place Card, Anti-Theft and
Service Parts ID.
4. Check the fuel level. Add additional weight if necessary to simulate a full tank.
5. Make sure the rear compartment is empty except for the spare tire.
6. Close the doors and hood.
Z Height Measurement
The Z height dimension measurement determines the proper ride height for the front end of the vehicle. Vehicles equipped with torsion bars use a
adjusting arm in order to adjust the Z height dimension. Vehicles without torsion bars have no adjustment and could require replacement of suspension
components.
Important: All dimensions are measured vertical to the ground. Cross vehicle Z heights should be within 12 mm (0.47 in) to be considered
correct.
1. Jounce the front and rear suspension to obtain at least 38 mm (1.5 in) deflection, then allow the vehicle to settle.
2. Set the top edge of the level on the reference surface of the steering knuckle (c) and extend the level directly under the rear end of the front
attachment bolt of the lower control arm (a).
3. While keeping the level in contact with the knuckle reference surface, adjust the level up/down until the bubble indicates it is horizontally level.
4. Extend a tape measure straight down from the center of the attachment bolt. The point where the tape measure and the level intersect is your first
measurement.
5. Keep the top edge of the level on the reference surface of the steering knuckle (c) and move the level directly under the front end of the rear
attachment bolt of the lower control arm (b).
6. Extend a tape measure straight down from the center of the attachment bolt. The point where the tape measure and the level intersect is your
second measurement.
7. Average the 2 readings (add them together, then divide by 2) and write down the result.