Mercedes M-Class W163

since 1997 release

Repair and operation of the car

Power supply system and production of the fulfilled gases

Specifications

General information and security measures

Petrol engines

Are a part of fuel system: established in a back part of the car (under a pillow of a back seat) the fuel tank with an adsorber on absorbent carbon, fuel-supply lines, the electric fuel pump, and also the electronic system of consecutive injection operated by the control unit.

The reserve of fuel is shown to the driver on the dashboard. Gather on the petrol engine of couple of gasoline in an adsorber and move in engine combustion chambers.

Style of driving of the car has significant effect on fuel consumption. Several councils for the reasonable handling of the accelerator pedal are given below:

• After start of the engine at once start even if it occurs on a frost;
• At a car stop for a while more on 40 with, switch off the engine;
• Move always on the highest transfer;
• At the movement on long distances whenever possible support uniform speed. Avoid the movement at high speeds. Drive the car circumspectly. Without need you do not brake;
• You transport the car excessive freight. If the luggage carrier is not used, remove it from a roof;
• Check air pressure in tires. Do not allow excessive pressure decrease.

Diesel engines

Are a part of fuel system: established in a back part of the car (under a pillow of a back seat) the fuel tank, the fuel filter, nozzles, fuel tubes and hoses, the fuel reserve sensor located in a tank and the block of electronic control the engine.

Fuel moves the special pump via the filter. In the filter the dirt and water which is contained in fuel accumulates.

The engine is operated the electronic system similar to a control system of petrol engines. The system operates operation of the engine, analyzing information arriving from a large number of sensors.

On diesel models there is no accelerator cable. Instead of it on a pedal the sensor of its situation is installed.

The fuel cut-off valve at switching off of ignition is absent. To kill the engine at switching off of ignition, the control unit of the engine sends a signal which, in turn, stops supply of fuel to nozzles to the TNVD control unit.

The fuel system is designed so that not to allow air "suction" in the absence of fuel in a tank. The control unit constantly checks fuel level in a tank, processing information arriving from the sensor of a reserve of the fuel located in a tank. When falling a reserve of fuel to a certain level the control unit activates a control lamp on a combination of devices then forcibly causes admissions of supply of fuel, limiting to that the maximum speed. It proceeds until fuel level in a tank does not exceed an admissible mark.

The fuel system of diesel engines is very reliable. When using pure fuel and performing regular service it has to function regularly before the termination of service life of the car. After very big run internal components of nozzles can wear out, and they will need to be repaired. As the pump - nozzles have a difficult design, repair is recommended to be carried out in a specialized workshop.

Security measures and rules of respect for purity during the work with fuel system

During the work with fuel system it is necessary to observe the following security measures and purity:

• Do not approach the place of performance of work with naked flame, do not smoke and do not turn on any heating devices! You keep in readiness the fire extinguisher;
• You monitor normal ventilation of a workplace, - fuel vapors are poisonous;
• The fuel system is under pressure. When opening system fuel can escape under pressure, - use goggles. Collect the spilled fuel by rags;
• During the work with components of a power supply system of the diesel engine observe special precautionary measures. In special degree it belongs to nozzles. Keep in mind that fuel pressure at an exit makes about 1100 atm of nozzles, - do not allow hit of any parts of a body under a fuel stream;
• Hose connections fasten by means of tape or tightening collars. Tightening collars need to be replaced with tape collars or collars of the last design surely. For installation of tape collars special devices are issued (for example, HAZET 796-5);
• Carefully clear connections and the places adjoining to them before opening;
• Stack the removed components on a pure lining and cover with polyethylene, paper or NEVORSYaShchEYSYa rags;
• Carefully close the open ends of nipple sockets, or cork them with suitable caps;
• Establish into place only pure details, - take replaceable components from packing only just before installation. Do not use the details stored in an unpacked look;
• Avoid use of compressed air at open fuel system, whenever possible try not to move the car;
• Do not apply the sealants containing silicone, - the particles of silicone which got to the engine do not burn down and can be the reason of failure of oxygen sensors.

Security measures at removal of the fuel tank

• Before removal of a tank merge from it fuel or pump out fuel the pump which is specially provided for this purpose;
• The fuel tank is removed from the lower party of the car. Before a detachment of collars of fastening of a tank bring to it from below a jack and linings;
• The empty tank is explosive and cannot be utilized in such look. Before utilization the tank has to be cut on a part. You watch that at the same time there was no spark. For this purpose hand over the fuel tank in the specialized enterprise;
• After installation of a tank into place start the engine and check tightness of all connections.