Chevrolet Sonic Repair Manual: Thrust Angles Description
The front wheels aim or steer the vehicle. The rear wheels control tracking. This tracking action relates to the thrust angle (3). The thrust angle is the path that the rear wheels take. Ideally, the thrust angle is geometrically aligned with the body centerline (2).
In the illustration, toe-in is shown on the left rear wheel, moving the thrust line (1) off center. The resulting deviation from the centerline is the thrust angle.
If the thrust angle is not set properly the vehicle may “dog track”, the steering wheel may not be centered or it could be perceived as a bent axle. Thrust angle can be checked during a wheel alignment.
Positive thrust angle means the thrust line is pointing to the right hand side (RHS) of the vehicle.
Negative thrust angle means the thrust line is pointing to the left hand side (LHS) of the vehicle.
If the thrust angle is out of specification, moving the axle to body relationship will change the thrust angle reading.
If the vehicle is out in the Positive (+) direction-moving the RHS forward and/or LHS rearward will move the thrust angle towards zero degrees.
If the vehicle is out in the Negative (−) direction-moving the RHS rearward and/or LHS forward will move the thrust angle towards zero degrees.
Steel Wheel Repair Description
Caution: Do not heat wheels in an attempt to soften them for straightening
or repair damage from striking curbs, etc. Do not weld wheels. The alloy used
in these wheels is heat-treated and un ...
Tire Dismounting and Mounting
Caution: Use a tire changing machine in order to dismount tires. Do
not use hand tools or tire irons alone in order to remove the tire from the
wheel. Damage to the tire beads or the wheel ri ...
Other materials:
Filling a Portable Fuel Container
Warning
Filling a portable fuel container while it is in the vehicle can cause fuel
vapors that can ignite either by static electricity or other means. You or others
could be badly burned and the vehicle could be damaged. Always:
. Use approved fuel containers.
. Remove the container from ...
Headlamp Aiming
Visual Aiming Preparation Procedure
Note: Some state and local laws specify requirements for headlamp
aim. Comply with all of these laws when performing any headlamp aiming operations.
Headlamp aim should be checked:
When a new headlamp capsule is installed.
If ser ...
Engine Support Fixture
2-
Engine Support Fixture
Callout
Component Name
Preliminary Procedure
Remove the radiator opening upper cover. Refer to Front Opening Upper
Cover Replacement
Special Tools
EN-28467-300 Engine Support Fixture Adapter ...
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