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Mercedes C-ClassW203 since 2000 of releaseRepair and operation of the car |
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Mercedes-Benz - Mercedes-Benz cars of class C (W-203) Identification numbers of the car Acquisition of spare parts Technology of service, tool and equipment of a workplace Poddomkrachivaniye and towage Start of the engine by means of the auxiliary rechargeable battery Automobile chemicals, oils and lubricants Diagnostics of malfunctions + Operation manual + Routine maintenance + Engine + Cooling system and heating + Power supply system and release + Engine electric equipment + Manual transmission + Automatic transmission + Coupling and power shafts + Brake system + Suspension bracket and steering + Body + Onboard electric equipment 
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Technology of service, tool and equipment of a workplace Sizes/marking of a class of durability of standard (SAE and USS) bolts
Sizes/marking of a class of durability of metric bolts
Marking of a class of durability of bolts (above - standard / SAE/USS, below - metric)
Marking of a class of durability of standard six-sided nuts
Marking of a class of durability of metric six-sided nuts
Technology of service There are several techniques of performing procedures of maintenance and car repairs on which the reader will find references in the text of this manual. Following will make by it work of the house mechanic of more effective, will allow to organize in the best way and to qualitatively perform various technical procedures and will be the key to careful and full implementation of all works. Fixture Fixture are called nuts, bolts, hairpins and screws serving for connection among themselves of two or more details. During the work with fixture it is necessary to remember some things constantly. Practically in any fixture this or that type of the kontryashchy and fixing devices is applied. It can be lock washers, lock-nuts, lock tags or the fixing compound for carvings. All used carving fixture has to be absolutely pure and direct, with an undisturbed carving and not rounded corners of six-sided heads which the wrench is put on. It is necessary to take obligatory replacement of the damaged nuts and bolts by new for the rule. Special самоконтрящиеся nuts with nylon or fiber inserts are not subject to reuse as at an otdavaniye lose the kontryashchy properties and at assembly have to be always replaced with new. The rusted bolts and nuts for simplification of unscrewing and in order to avoid damage before an otdavaniye have to be processed by the special getting structure. Many mechanics prefer to use turpentine which is convenient for putting from a special small canister with a long nose for this purpose. After wetting of the "stuck" fixture by the getting structure before starting its otdavaniye, it is necessary to give to structure within several minutes properly to impregnate the oxidized contact layer. Strongly rusted fixture can be cut down by a chisel, is cut by a hacksaw or removed by means of a special gaykolom. When cutting a head of a bolt or oblamyvaniya of a hairpin on assembly, the rest of a carving part can be drilled or taken by means of the special tool. Most auto repair shops can undertake performance by this, also as well as others (for example, restoration of the stripped thread in carving openings), repair procedures. Flat and lock washers at assembly have to be established always into place in the same order and the same way, as earlier. Always replace the damaged washers with new. Between a lock washer and a soft metal surface (for example, aluminum), thin sheet metal or plastic it is always necessary to establish flat washers. Fixture sizes For many reasons manufacturers of cars use metric fixture more and more widely. However, it is important to know a difference between used sometimes standard (called also American, or the SAE standard) and more universal in system of measures metric fixture as, despite external similarity, they are not interchangeable. All bolts, both standard, and metric are classified by diameter, a step of a carving and length. For example, the standard bolt Ѕ – 13х1 has an inch floor in the diameter, 13 rounds of a carving on one inch and length of 1 inch. The metric bolt of M12 - 1.75х25 has diameter of 12 mm, a step of a carving of 1.75 mm (distance between the next rounds) and length of 25 mm. Both bolts are externally almost identical, however are not interchangeable. In addition to the listed signs both metric, and standard bolts can be identified by survey of a head. For a start, the distance between lyska of a head of a metric bolt is measured in mm whereas at standard - in inches (the same is fair also for nuts). As a result, the standard wrench does not suit for use with metric fixture and vice versa. Besides, on heads of the most part of standard bolts usually there are radial notches defining the maximum admissible effort of tightening of a bolt (durability degree). The more the quantity of notches, the are higher admissible effort (on cars bolts with degree of durability from 0 to 5 are usually applied). The class of durability of metric bolts is defined by a digital code. Figures of a code are usually cast, as well as for standard, on a bolt head (on cars bolts of classes of durability 8.8, 9.8, and 10.9 are usually applied). Also on durability class tags standard nuts can be distinguished from metric. Dot tags, proshtampovyvayemy on one of face surfaces of a nut while marking of metric nuts is made by means of besides figures are applied to identification of durability of standard nuts. The quantity of points are more, or the value of a digital code is higher, the admissible effort of tightening of a nut is higher. End faces of metric hairpins are also marked according to a class of their durability. Large hairpins are marked by a digital code whereas marking in the form of a geometrical figure is applied on smaller. It is necessary to notice that a considerable part of fixture, in particular the class of durability from 0 to 2, is not marked at all. In this case the only way of difference of standard fixture from metric is measurement of a step of a carving, or comparison of a carving with unambiguously identified. Standard fixture is often called also, contrary to metric, SAE standard fixture, however, it is necessary to remember that under classification of SAE only small fixture gets. Large fixture with not metric carving is fixture of the American standard (USS). As fixture of the same geometrical size (both standard, and metric) can have various classes of durability, when replacing on the car of bolts, nuts and hairpins it is necessary to pay attention to compliance of a class of durability of the installed new fixture to a class of durability of old. Procedure and order of tightening of threaded connections Tightening of the most part of threaded connections should be made with the efforts determined by requirements of the Specifications provided in the beginning of each Chapter of this manual (it is necessary to understand the torque enclosed to it when tightening as effort of tightening of fixture). Below the effort of tightening will be called also fixture inhaling moment. Tightening with excessive effort can lead to violation of integrity of fixture whereas the nedotyagivaniye leads it to unreliability of connection interfaced a component. Bolts, screws and hairpins, depending on material of which they are made also diameter of a carving part usually have strictly certain admissible moments of an inhaling, many of which as it was already mentioned above, are given in Specifications at the beginning of each Chapter. Strictly adhere to the provided recommendations about the moments of an inhaling of fixture used on the car. For tightening of fixture which is not mentioned in Specifications it is necessary to use the map of the admissible moments of rotation given below. The values given in the table are focused on fixture of classes of durability 2 and 3 (more high-class fixture allows tightening with big effort), besides, it is meant that tightening dry (with an ungreased carving) fixture in a steel or cast (not aluminum) detail is made. Sizes of metric carvings
Sizes of pipe carvings
Sizes of carvings of the American standard
Fixture located on perimeter of any detail (such as bolts of a head of cylinders, the pallet of a case and various covers), in order to avoid deformation of a detail has to be given and drag on in strictly certain order. The order of tightening and an otdavaniye of such fixture is given in the corresponding Heads of the Management. If the special order is not stipulated, then in order to avoid a curvature of a component it is necessary to adhere to the procedure described below. At the first stage all bolts or nuts have to be tightened by hand. Further, each of them has to be in turn held on on one whole revolution, and transition of odes of one bolt / nut to another has to be carried out in a diagonal order (cross-wise). Further, having returned to the first bolt / nut, it is necessary to repeat the procedure in the same order, tightening fixture for a half-turn. Continue to act in the same manner, tightening each bolt / nut this time already on a quarter of a turn for one approach until all of them are not tightened with the required effort. At fixture otdavaniye it is also necessary to adhere to the described procedure, but working upside-down.
Measures of precautions which should be observed at removal of hoses are very close to those at removal of laying. Avoid damage of surfaces of unions and branch pipes on which hoses as it can be the cause of leaks put on. In a special measure it belongs to the procedure of removal of hoses of a radiator. Owing to various chemical reactions occurs "prikipany" rubbers of hoses to the interfaced surfaces of unions and branch pipes. For removal of a hose first of all weaken a collar of fastening it on the union. Then nippers with the sliding hinge grasp a hose near a collar and begin to rotate it on the union / a connecting branch pipe to the right-to the left. Continue this procedure before liberation of a hose, then remove a hose from the union. A small amount of silicone or other lubricant will facilitate the procedure if it can be entered into a gap between the union and a hose. For simplification of the procedure of installation of a hose grease an internal surface of a hose and the external surface of the union. Set of the combined keys
Tool kit for the general and capital repairs of the car | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||