4.4.10. Check and adjustment of angles of installation of wheels
Check and adjustment of angles of installation of wheels are necessary for ensuring good stability and controllability of the car, and also uniform wear of tires at operation. Check and adjustment of angles of installation of wheels are carried out at special stands according to instructions for their operation.
Discrepancy of the valid values measured on the car to the control values provided below can speak wear and deformation of details of a suspension bracket, deformation of a body.
Replacement or repair of details of a suspension bracket can cause change of angles of installation of wheels therefore check of angles of installation of wheels after carrying out these works is obligatory.
An inspection of a convergence of wheels is carried out by method of measurement of distance between middle parts of sidewalls of tires. The distance And (fig. 4.5) between wheels in front has to be 0,5-1,5 mm less than a distance In between wheels behind.
Fig. 4.5. Check of a convergence of wheels
The convergence of forward wheels is regulated change of length of draft of a steering trapeze, for adjustment of a convergence execute the following operations.
Weaken an inhaling of kontryashchy nuts and rotation of adjusting draft achieve the correct convergence of wheels then tighten kontryashchy nuts.
An inspection of angles of the maximum turn of wheels is carried out at the stand, an angle of rotation of the right wheel to the right (the left wheel to the left) has to be in limits 26-27o.
Fig. 4.6. Adjustment of angles of rotation of wheels: 1 – persistent bolt; 2 – kontryashchy nut; 3 – emphasis (turn limiter)
Regulate angles of rotation of forward wheels rotation of a persistent bolt of 1 (fig. 4.6), previously having weakened an inhaling of a kontryashchy nut 2.