Isuzu 1999 RODEO Workshop Manual page 115

Rodeo 1999
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Caster:
This illustration shows view from the side of the vehicle.
Caster (1) is the vertical tilting of the wheel axis either
forward or backward (when viewed from the side of the
vehicle). A backward tilt is positive (+) and a forward tilt is
negative (-). On the short and long arm type suspension
you cannot see a caster angle without a special
instrument, but if you look straight down from the top of
the upper control arm to the ground, the ball joints do not
line up (fore and aft) when a caster angle other than 0
degree is present. With a positive angle, the lower ball
joint would be slightly ahead (toward the front of the
vehicle) of the upper ball joint center line.
Toe-in:
This illustration shows view from the top of the vehicle.
POWER–ASSISTED STEERING SYSTEM
Toe-in is the measured amount the front wheels are turn
in. The actual amount of toe-in is normally a fraction of a
degree. Toe-in is measured from the center of the tire
treads or from the inside of the tires. The purpose of
toe-in is to insure parallel rolling of the front wheels and to
offset any small deflections of the wheel support system
which occurs when the vehicle is rolling forward.
Incorrect toe-in results in excessive toe-in and unstable
steering. Toe-in is the last alignment to be set in the front
end alignment procedure.
Inspection
Before making any adjustments affecting caster, camber
or toe-in, the following front end inspection should be
made.
1. Inspect the tires for proper inflation pressure. Refer to
Main Data and Specifications in Wheel and Tire
System section.
2. Make sure that the vehicle is unladen condition (With
no passenger or loading).
3. Make sure that the spare tire is installed at the normal
480RS005
position.
4. Inspect the front wheel bearings for proper
adjustment. Refer to Front Hub and Disc Overhaul in
Suspension section.
5. Inspect the ball joints and tie rod ends. If excessive
looseness is noted, correct before adjusting. Refer to
Steering Linkage in this section.
6. Inspect the wheel and tires for run-out. Refer to
Wheel Replacement in Wheel and Tire System
section.
7. Inspect the trim height. If not within specifications,
the correction must be made before adjusting caster.
8. Inspect the steering unit for looseness at the frame.
9. Inspect shock absorbers for leaks or any noticeable
noise. Refer to Shock Absorber in Suspension
section.
10. Inspect the control arms or stabilizer bar attachment
for looseness. Refer to Suspension section .
11. Inspect the front end alignment using alignment
equipment. Follow the manufacturer's instructions.
12. Park the vehicle must be on a level surface.
480RS003
2A–13

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