The discrepancy between the actual values measured on the vehicle and the reference values indicated below is due to wear and deformation of the suspension parts or deformation of the body.
The angles of installation of the wheels of the car are given in table. 7.1.
Parameter | Permissible value |
Front wheel camber | -0,30°±0,75° |
Front wheel alignment | 0,105°±0,167° |
Angle of longitudinal inclination of the axis of rotation of the front wheels | 4,65°±0,75° |
Rear wheel collapse | -1,42°±0,50° |
Rear wheel alignment | 0,00±0,208° |
Check the wheel alignment on a vehicle with a load of 70 kg in each front seat, with the fuel tank half full, with normal tire pressures and no excessive play in the suspension units.
After installing the car on the stand (just before checking corners) «press» car suspension, applying two or three times a force of 392-490 N (40-50 kgf), from top to bottom towards the front bumper. The wheels of the vehicle must be parallel to the longitudinal axis of the vehicle.
When checking and adjusting the front wheel alignment, first check the caster angle, then the camber angle, and lastly the toe-in.
The angle of longitudinal inclination of the axis of rotation of the front wheel is formed by a vertical line and a line passing through the middle of the upper support of the telescopic strut and the center of the ball bearing sphere fixed on the lower arm. Adjusting the angle of the longitudinal inclination of the axis of rotation is not provided for by the design of the car. If the angle deviates from the nominal value, replace damaged and deformed parts.
The camber angle of the front wheels is characterized by the deviation of the mean plane of rotation of the wheel from the vertical. Adjustment of a corner of disorder of forward wheels is not provided by a design of the car.
The convergence of the front wheels is the angle between the plane of rotation of the wheel and the longitudinal axis of the vehicle. The convergence of the front wheels is regulated by changing the length of the steering rods.
The rear wheel alignment angles are predetermined by design and are not adjustable in operation. It is only possible to control the condition of the rear suspension at the installation angles. The procedure for checking the alignment of the rear wheels is similar to the procedure for checking the front wheels.