S-class W202 Mercedes

1993-2000 of release

Repair and car operation

Optimum road performance and the minimum wear of rubber are reached only if the provision of wheels is correctly exposed. At the increased and non-uniform wear of tires, and also a road incontience – at bad stability of the direction and insufficient stability on turns it is necessary to address in a workshop, that by means of optical methods to expose disorder convergence.

Installation of disorder convergence cannot be carried out without the corresponding equipment. Therefore only the main concepts necessary for installation of disorder convergence here are described.

Convergence

The corner on which the plane of a wheel deviates a longitudinal axis of the car is called as a convergence. The positive convergence means that wheels at measurement in front agree on height of their centers a little closer, than behind. The negative convergence means that wheels in front disperse more than behind.

At the Mercedes car both forward, and back wheels have a positive convergence: forward wheels – 0°25' (a sports suspension bracket 0°10'), back wheels – 0°25'.

Disorder and cross-section inclination шкворня rotary fist

Peredny Bridge

Disorder and cross-section inclination шкворня a rotary fist reduce transfer of pushes by a steering and provide the minimum friction on turns.

Disorder call a corner on which the plane of a wheel deviates a vertical. Forward wheels, thus, will defend at negative disorder in a contact point with the road further from each other, than from above. At the Mercedes car lobbies and back wheels have negative disorder.

The cross-section inclination шкворня is a corner between an axis of turn of a fist and a vertical in a point of standing of a wheel if to look in the longitudinal direction of the car.

Disorder and cross-section inclination шкворня a rotary fist in common define a so-called shoulder of a running in. Thanks to the relevant constructive data, big stability in the direction is reached when braking, in particular, if wheels are on a various paving (for example if the left wheel brakes on dry, and right – on the wet road).

Longitudinal inclination шкворня back

The longitudinal inclination шкворня is a corner between an axis of turn of a fist and a vertical in the cross-section direction back. This inclination substantially influences management of forward wheels at movement on a straight line. The insignificant inclination favors to deviations from the movement direction when driving on bad roads or at a lateral wind, and on turns the wheel badly comes back to average situation.

The longitudinal inclination together with disorder is exposed by means of two bolts with the clown on suspension bracket levers.

Preconditions for check

 – the ordered pressure of air in tires;
 – the car is not loaded, but prepared for a trip: a full tank, запаска and the tool – all this should be at check;
 – previously strongly to shake a suspension bracket;
 – the wheel costs directly;
 – it is adjusted люфт in suspension bracket levers;
 – it is adjusted люфт in bearings of wheels.

Check/installation of a positive convergence of forward wheels

The provision of forward wheels at the sight of from above

Exact installation of disorder convergence should be made only in a firm workshop. At unilateral wear of tires the convergence generally should be checked. The convergence is checked, if parts of a steering trapeze acted in film. The convergence can be checked by rather simple means.

The above-stated preconditions for check should be observed.

PERFORMANCE ORDER

1. Put wheels directly, the cross-piece of a wheel should be located horizontally. 2. Average situation is reached when the groove on a joint of steering connection coincides with a marking mark in the steering mechanism (shooter). If thus the steering wheel costs not absolutely directly, remove it and rearrange. 3. Place between forward wheels in front a sliding bar and move apart it effort about 100 N (corresponds 10кГ). For this purpose use a firm special equipment or a similar bar. Razdvizhka is necessary to simulate movement when wheels aspire to be moved apart outside. 4. Measure a convergence. The general convergence of forward wheels should make 0°25 '±10' (for a sports suspension bracket 0°10 '±10'). It means that rim edges in front should stand on 1 mm closer, than behind. 5. Establish a positive convergence, rotating the lever of a steering trapeze for a shestigrannik (10е). Previously release tightening a cone (10f), thus hold the lever for a shestigrannik a rozhkovy key. 6. Establish a positive convergence with an identical corner at the left and on the right, the wheel should be thus on the average situation. 7. Tighten tightening a cone (10f) the moment of 50 N of m, holding the lever of a steering trapeze for a shestigrannik a rozhkovy key. Check a cuff of the ball hinge, it should not be crumpled or damaged. After check (installation) remove the adaptation for a razdvizhka of wheels.