Checking the free play (backlash) of the steering wheel

With an increased free play of the steering wheel, it is difficult to control the car, as it responds to the driver's actions with a delay. In addition, increased travel that cannot be corrected by steering adjustment is indicative of a steering problem (loosening of the fastening of the steering mechanism, steering rods or wear of their parts).

Check steering wheel play with the vehicle parked on a level, non-slip surface. The play must not exceed 5°. You can define backlash in linear units (mm) according to the formula

L = (5°/360°) pD, Where

L - play of the steering wheel, mm;
p = 3,14;
D - outer diameter of the steering wheel, mm.

For a steering wheel with an outer diameter of 380 mm, play should not exceed 16–18 mm.

You will need: ruler, chalk (or wire) for labeling.

1. Set the front wheels to a straight ahead position.



2. Install the ruler so that its end rests against the instrument panel, and the plane of the ruler touches the outer surface of the steering wheel rim. Without changing the position of the ruler, turn the steering wheel to the left until the front wheels begin to turn. In this position, mark the steering wheel rim (fasten the wire).




3. Without changing the position of the ruler, turn the steering wheel to the right until the front wheels begin to turn.

4. In this position, put a second mark on the steering wheel rim (fasten the wire).



5. Measure the distance between the marks along the rim. It should not exceed the calculated value. If the distance (steering wheel free play) more, it is necessary to establish the cause and eliminate it.