Mercedes C-Class

W203 since 2000 of release

Repair and operation of the car



Mercedes-Benz
+ Mercedes-Benz cars of class C (W-203)
+ Operation manual
- Routine maintenance
   Specifications
   Indicator of term of approach of planned maintenance (ASSYST)
   Schedule of routine maintenance
   General information on control
   Check of levels of liquids, control of leaks
   Check of a condition of tires and pressure in them. Designation of tires and disks of wheels. Rotation and replacement of wheels
   Replacement of motive oil and oil filter
   Checks of the brake system. Adjustment of the parking brake
   Check of fuel system
   Check of a state and replacement of hoses of a motive compartment, localization of leaks
   Check of a condition of ridge belts of the streaming drive of auxiliary units
   Check of functioning of the cooling system and frost resistance of cooling liquid. Liquid replacement
   Check of a condition of system of production of the fulfilled gases
   Check of level of oil of automatic transmission
   Visual control of a box of gear shifting on oil leak
   Check of a state component of a suspension bracket and steering
   Check of a condition of protective covers of power shafts
   Check of level of liquid of system of hydrostrengthening of a wheel
   Check of level of liquid of system of adjustment of clearance
   Check of the air conditioning system
   Cleaning of the mechanism of the movable panel of the hatch of a roof
   Visual control of a seat belt and block of a safety cushion
   Check of operability of headlights and horn
   Check of a state, adjustment and replacement of brushes of screen wipers
   Check of a condition of the battery, care of it and charging
   Replacement of the battery of system of an emergency call of Tele-Aid
   Replacement of an element of the filter of air of salon / coal filter of purification of air
   Check, cleaning and lubricant of the coupling device
   Replacement of brake fluid
   Check of the elastic coupling of the driveshaft
   Check and replacement of spark plugs. Check of a condition of high-voltage wires
   Replacement of an element of the air filter of the engine
   Replacement of the fuel filter
+ 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







Check and replacement of spark plugs. Check of a condition of high-voltage wires

Address also the Section Check and adjustment of a corner of an advancing of ignition.

 Attention! Replace spark plugs only on cold or slightly warm engine. If candles are turned out on the hot engine, the carving of the head of cylinders made of light metal can be damaged.


Before work prepare all necessary tools. Some producers of spark plugs deliver special tools for measurement of a candle gap.

Engines 111, 271

· Candle key of 16 mm, for example, HAZET-2506 or-2776 (engines 111, 271) or HAZET-4766 (engine 112).
· It is in addition recommended to get special pincers, for example, of HAZET 1849 which facilitate an otvorachivaniye of candles. MERCEDES-BENZ applies for this purpose an assembly key 3277A.
· Depending on number of cylinders of the engine necessary quantity of spark plugs. The applied spark plugs are listed in Specifications.

Turn out spark plugs

1 — the Candle key
2 — the Mine of a candle
3 — the ignition Coil

 PERFORMANCE ORDER

1. The best way of replacement of spark plugs is preliminary purchase of new candles, adjustment of their gap and replacement of each candle in turn. Upon purchase of candles it is very important to choose those candles which are intended for the engine of your car. Information on them is provided in Specifications.
2. Having near at hand new candles, let's the engine cool down completely before removal of old. During this time it is possible to examine new candles on existence in them of defects and to check candle gaps.

 Do not concern the parts which are under high voltage. The persons having a warm stimulator should not carry out any works with electronic system of ignition.

3. Remove ignition coils, address the Section Removal and installation of coils of ignition.


4. Turn out spark plugs by means of a candle key (1). At the same time you watch that the key stood directly and it was not warped.


Check

 PERFORMANCE ORDER

1. Compare the taken-out candle with shown in pictures in the Head Elektrooborudovaniye of the engine, it will give you useful information about the general condition of the engine.
2. Check the probe interelectrode distance. The required value of a gap is given in Specifications.

At new candles the interelectrode distance is, as a rule, established correctly.

3. For installation of distance between contacts turn in the corresponding electrode of weight. For this purpose knock sideways on it. At a podgibaniye you oboprit the small screw-driver about edge of a carving. Do not lean at all on the central electrode as it can be damaged.
4. Apply a little cupriferous anti-taking structure on a carving of a new candle. Establish a candle in a head of cylinders and screw it fingers against the stop, then tighten by means of a head of a candle key. If it is possible, use a dynamometer key for tightening of a candle to be sure that it is established correctly. The effort of tightening of candles is included in Specifications.
Recommendations: In order to avoid a possibility of a vvinchivaniye of a candle not on a carving put on a small piece of a rubber hose or a plastic tube its shaft. The flexible tube will work as universal - the cardan hinge, providing alignment of a candle in relation to a candle nest and in case the candle begins to warp, the hose will slip on it, without giving the chance to strip a thread.
5. Before connection to a candle of a high-voltage (VV) wire carefully examine it on damages, corrosion of internal contact and measure resistance. If it considerably exceeds 30 kOhm/meter – replace all set of wires.
6. Connect a wire to the established new candle, again using rotary motion and holding the socket until it is put on a candle up to the end.
7. Repeat the procedure described above for other spark plugs consistently to avoid the wrong connection of candle VV of wires.


Installation

 PERFORMANCE ORDER

1. Insert a candle and screw it against the stop in a head of cylinders. After that tighten a candle the moment specified in Specifications. At the same time you hold a candle key (1) directly (And), without warping it (In).

2. Establish to the place of the ignition coil, address the Section Removal and installation of coils of ignition.


Repair of the damaged carving of spark plugs

 PERFORMANCE ORDER

If it becomes clear that the carving under a spark plug in a head of cylinders is damaged, it needs to be repaired. For this purpose there is the corresponding tool and a repair kit, for example, of BERU. The damaged carving is drilled by a special drill. For this purpose it is not obligatory to remove a head of cylinders. Then in a head the new carving is cut and the candle is rolled in a special transitional carving insert. In addition established carving inserts of candles sit strongly and provide tightness.


Engine 112

Only differences from 4-cylinder engines 111, 271 are described.

Removal

Dual coils of ignition for two spark plugs and and b of one cylinder

1 — the Case of coils and and b 2 — Designation on a cover of valves

 PERFORMANCE ORDER

1. Disconnect a cover from an engine end face.
2. Remove the top part of the case of the air filter (only at engines with the air filter located sideways the car).
3. Remove the measuring instrument of mass of air with the soaking-up branch pipe (only at engines with the air filter located sideways the car).
4. Uncover the engine or the air filter, address the Section Removal and installation of the air filter.
5. Disconnect coils of ignition (1).
6. Disunite the spark plug plug by means of a double wrench from spark plugs over a cover of a head of cylinders.
7. Turn out spark plugs.


Installation

 PERFORMANCE ORDER

1. Screw candles by hand against the stop in a head of cylinders and then tighten the moment 28 Nanometers.

Each cylinder has two candles. Not to mix plugs, it is necessary to mark them just as a cover on the engine (2).

2. Connect plugs to candles.
3. Install coils of ignition and fix by the moment 8 Nanometers.
4. Establish a cover of the engine or the air filter, address the Section Removal and installation of the air filter.
5. Install the measuring instrument of mass of air with a branch pipe (only at engines with the air filter located sideways the car).
6. Establish the top part of the case of the air filter (only at engines with the air filter located sideways the car).
7. Fix a cover from an engine end face.