Check and adjust wheel alignment

For proper wheel alignment test vehicle must be unloaded (the level of fuel in the fuel tank does not matter), and the pressure in the tires of the wheels brought up to standards.

Before wheel alignment lift the front of the car and establish support under suspension arms as close to the ball joint (Fig. 7.5).

Then, make sure that no backlash (Fig. 7.6):

- In the steering mechanism and the steering rod ball joints;

- Bearing wheels;

- In the upper mount buffer spring struts;

- In the ball joint and control arm bushings.

In the presence of the backlash in one of said nodes must be corrected before the start of measurement and adjustment.

The measuring equipment installed according to the instructions attached to it. Turntable, mounted under the front wheels must absorb lateral movements.

For a correct measurement of camber angle and caster wheel axis of rotation of the vehicle must be in a horizontal position. It is several times much to swing the front of the vehicle on the turntable up and down. This is necessary to ensure that the suspension returned to its normal position.

Camber (Fig. 7.7, a) should be 0 ?� 30 '?� 1 ?�. To the left and right sides of the angle may differ by no more than 40 '.

Longitudinal tilt wheel rotation axis (Fig. 7.7, b) should be 12 ?� 41 '?� 1 ?�, and may also be different for the right and left sides of a maximum of 40'.

Wheel alignment follow in this order:

- Remove the bolts knuckle;

- Adjust the suspension;

- Place and tighten the bolts;

- Check the corners again;

- Tighten the bolts knuckle moment 91 Nm (Fig. 7.8).

If the values of the wheels are out of tolerance, replace defective or damaged parts.

The convergence of the front wheels of the car should be set relative to the axis of withdrawal, as the rear wheels have variable angles of installation. This will ensure maximum stability of the vehicle and minimum tire wear.

Make sure that the devices on the front and rear axles are correctly oriented relative to each other. This is extremely important for the measurement of convergence with respect to the axis of the wheel slip, which is obtained with the same toe angles of the rear wheels (Fig. 7.9).

The angle between the longitudinal axis and the axis of symmetry AS IN wheel slip angle is called withdrawal. This angle may not exceed 12 '(to increase the visibility of slip angle is shown in the figure greatly increased).

Toe angle can be determined by measuring a level difference between the hub or the calculation of distances between the front and rear edges of the wheels at A-A, B-B and C-C (Fig. 7.10). Nominal values front toe: a = 9 '?� 3'; Ah = 1-3 mm; B = at 1-2.5 mm; Cc = 1-2 mm.

Adjust the toe should be in this order:

- Loosen the lock nut on the steering rods 2;

- Adjust the toe by turning the tie rods;

- Tighten the lock nut torque 42 Nm;

- Make sure that a rubber protective cover sits right;

- Measure the distance between the edge of the thread and lock nut on the left and right rods: the length of the steering gear must not differ by more than 2 mm.