4.4.6. Check and adjustment of angles of installation of forward 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 its 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 is caused by wear and deformation of details of a suspension bracket, deformation of a body.

Prevention
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.

Note
Check the angles of installation of wheels on the car with the fuel tank filled half, with ballast weighing 70 kg on each front seat.

The angles of installation of wheels of the car in the equipped state:
disorder..... 0 ° ±30’
convergence..... (0±1,0) mm
corner of a longitudinal inclination of an axis of turn..... 1 °30 '±30’

Prevention
The difference of corners of a longitudinal inclination of an axis of turn between the right and left wheel should not exceed 1 °.

Before adjustment of angles of installation of wheels check:
– air pressure in tires;
– a radial and axial beating of disks of wheels which should not exceed respectively 0,7 and 1 mm;
– free wheeling (side play) of a steering wheel;
– a free wheeling (side play) in bearings of naves of forward wheels;
– technical condition of details and knots of a suspension bracket (lack of deformations, destruction and wear of rubber-metal hinges, inadmissible draft of the top support of a rack of a suspension bracket).
Eliminate the noticed malfunctions.
After installation of the car on the stand (just before control of corners) you "prozhmit" a car suspension bracket, putting two-three times the effort of 392-490 N (40–50 kgfs) directed from top to down, at first to a rear bumper, and then — on forward. At the same time wheels of the car have to settle down parallel to a longitudinal axis of the car.

Note
At adjustment of angles of installation of wheels at first adjust a corner of a longitudinal inclination of an axis of turn, and then a corner of disorder and a convergence of wheels.

Corner of a longitudinal inclination of an axis of turn.
If the corner does not correspond to the data given above, change quantity of the adjusting washers established on both ends of extensions of a suspension bracket. For increase in a corner of a longitudinal inclination of an axis of turn reduce quantity of washers on an extension in forward or its back part. To the contrary, for reduction of a corner add quantity of washers, but only in a back part of an extension as ahead it is not always possible to execute it because of a short carving part of an extension.
At change of quantity of washers on an extension you watch that facets on washers were turned towards a persistent end face of an extension. Follow this rule also at installation of an internal persistent washer of the rubber-metal hinge when adjusting washers are completely removed. At non-compliance with the specified requirements weakening of an inhaling of nuts of fastening of extensions is possible.
The number of adjusting washers on an extension should not be more than two ahead and four behind.
In order that the provision of an extension concerning the suspension bracket lever at adjustment of a longitudinal inclination of an axis of turn did not change, use special adaptation which fixes an extension concerning the lever, that does not allow to turn to an extension from influence of efforts at a wraparound of a nut of fastening of an extension to the lever. This requirement needs to be observed not to allow premature wear of the rubber-metal hinge and a rubber pillow on which the ends of an extension rely.
At installation or withdrawal of one adjusting washer the corner of a longitudinal inclination of an axis of turn changes approximately on 19’.
Corner of disorder of forward wheels.
If the corner of disorder differs from norm, adjust it.
For this purpose weaken nuts of the top and lower bolts and, turning the top adjusting bolt, establish a necessary corner of disorder of wheels. Upon termination of adjustment tighten nuts the moment of 88,2 N · m (9 kgfs · м).

Convergence of forward wheels.
If the convergence does not meet standard …
… weaken a key "on 13" coupling bolts of tips of steering drafts …
… and, rotating a key "on 22" adjusting drafts, establish a necessary convergence. Then be convinced that the plane of the spherical hinge is parallel to the plane of a basic surface of the rotary lever then tighten coupling bolts of tips of steering drafts the moment of 19,1-30,9 N · m (1,95–3,15 kgfs · м).