Mercedes S-Class W-140

1991-1999 of release

Repair and car operation



Mercedes S-Class
+ Mercedes-Benz Cars of a class S (W-140)
+ Operation manual
+ Routine maintenance
+ Engine
+ Systems of cooling, heating
+ Power supply system and release
+ engine Electric equipment
+ gear shifting Box
+ Avtomaticheckaya transmission
+ Coupling
+ Brake system
- Suspension bracket and steering
   Security measures
   Corners of installation of wheels of the car, road clearance
   + Forward suspension bracket
   + Back suspension bracket
   + Steering
+ Body
+ Onboard electric equipment



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Corners of installation of wheels of the car, road clearance

General information

Corners of installation of wheels considerably influence stability of the car, wear of tires and fuel consumption. Values of corners are given in Specifications.

Disorder
is an inclination of a wheel in the vertical plane relatively the average line of the car. It can be positive if wheels are inclined outside or negative if wheels are inclined inside. The disorder corner, generally influences uniformity of wear of tires of forward wheels. If disorder of one wheel positive, and another negative, withdraws the car aside at movement on a straight line.

Convergence
- lateral distance between wheels. The positive convergence means that wheels are in front located more closely to each other, than behind at measurement at height of an average point of a wheel. The negative convergence means that wheels in front are at bigger distance from each other, than behind.

The cross-section inclination of an axis of turn of a wheel
is a corner between an axis of an inclination of a rotary fist and the vertical which has been carried out through a point of fastening of a wheel, looking in the longitudinal direction of the car.

At the expense of corners of disorder and a cross-section inclination of an axis of turn of a point of a contact of wheels with the road settle down closer to an axis of a rotary fist. It supports so-called «a running in shoulder», driving is easier than subjects. Also blows from roughness of a covering are less transferred to a steering.

Longitudinal inclination of an axis of turn of a wheel.
The axis concerning which there is a wheel turn, takes place in space so that its lower part is directed forward. Such corner of a longitudinal inclination is called as positive. At positive value of a corner self-return of a wheel to average situation after turn improves.

Conditions of check of corners of installation of wheels

Check of corners of installation of the car demands existence of a viewing hole or the special measuring lift. At carrying out measurement it is necessary to satisfy the following conditions:
  • Pressure of air in tires corresponds to the set;
  • Forward wheels are put directly;
  • The car is not loaded, the fuel tank is completely filled;
  • Suspension brackets of the car strongly прожаты;
  • The steering is adjusted;
  • Gaps in interface of steering drafts lie within the admissible;
  • Gaps in interface of a suspension bracket lie within the admissible;
  • Depth of drawing of a protector of tires of one axis is identical.
  • Adjustment of forward wheels

    Disorder and longitudinal inclination of an axis of turn of a wheel

    Adjustment of disorder and longitudinal inclination of an axis of turn of forward wheels - is made by means of an ekstsentrikovy bolt

    Adjustment of disorder is carried out by a forward kulachkovy bolt (19), and the longitudinal tilt angle of an axis of turn of a wheel is regulated by a back ekstsentrikovy bolt (20) on the bottom lever. By means of the same bolt adjustment of a corner of a longitudinal inclination of an axis of turn of a wheel is carried out.

    Convergence

    Check and adjustment of a convergence of forward wheels


     PERFORMANCE ORDER

    1. Establish wheels in situation for rectilinear movement by means of the device (055).
    2. Check the central position of the steering mechanism and a steering wheel (arrow).
    3. Establish a ruler (030) between internal surfaces of forward wheels. Check a convergence of forward wheels.
    4. Adjustment of a convergence is carried out by rotation of steering drafts (10). The nominal size of a convergence of forward wheels makes 0°35 '± 10' (see. Specifications).

    Adjustment of back wheels

    Disorder

    The size of disorder of back wheels depends on height of a road gleam (road clearance). Adjusting parameters are specified in Specifications) to the present Chapter.

    Convergence

    Adjustment of a convergence of back wheels

    The convergence of back wheels is regulated by ekstsentrikovy bolts (60а) on the left and right drafts (60) on a support of a back suspension bracket (50).

    Check of a road clearance of a body of the car

    Check of a road clearance of a body of the car

    The road clearance of a forward suspension bracket of the car is checked by means of the measuring device (01) between ekstsentrikovy bolts of fastening of the bottom lever.

    The road clearance of a back suspension bracket of the car is checked by means of the device (02) attached on a power shaft of a back axis.