Mercedes M-Class W163

since 1997 release

Repair and operation of the car


Mercedes W163
+ Mercedes-Benz cars of a class M (W163)
+ Governing bodies and methods of safe operation
+ Current leaving and service
+ Engine
- Cooling systems, heating and air conditioner
   + Engine cooling system
   + Systems of ventilation, heating and air conditioning
+ A power supply system and production of the fulfilled gases
+ Systems of electric equipment of the engine
+ Manual box of gear shifting
+ Automatic transmission
+ Transmission line
+ Brake and auxiliary systems
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

Cooling systems, heating and air conditioner

Specifications

Cooling system

General parameters

Cooling system type Closed, with the water pump, the thermostat, a radiator, the fan (electric or with a viscous clutch coupling) and separately installed broad tank
System volume See Specifications to the Head the Current leaving and service
Composition of cooling liquid (an antifreeze share in cooling liquid for ensuring frost resistance)
to -37 °C 50%
to -45 °C 55%
Pressure in system About 1.4 bars (the exact size is specified on a cover of a broad tank).
Thermostat
Valve stroke, mm not less than 8
Temperatures of activation of the valve, °C
Beginning of opening 85 ÷ 89
Full opening 102
Cover of a path of the cooling system
Petrol models On models petrol models the cooling system cover is not subject to testing and in case of failure has to be replaced
Diesel models (code of a cover 140/200)
Depth of depression of operation of the vacuum valve, bar 0.1
Pressure of opening of the safety valve, bar
First stage (temperature of cooling liquid 130/134 of °C) 1.4
Second stage (temperature of cooling liquid 137/143 of °C) 2.0
Pressure of testing of a cover, bar 1.4 (a cover have to keep this pressure within not less than 2 minutes)
Air conditioning system
Coolant type R134a
Coolant volume, 750
Type of refrigerator oil Synthetic PAG
Amount of the compressor oil added at:
To replacement of the evaporator, cm3 40
To replacement of the condenser, cm3 20
To replacement of a receiver dehumidifier, cm3 10
To replacement to the soaking-up line, cm3 20
To replacement of the pressure head line, cm3 20
To replacement of the compressor, cm3 20
Identification of leaks, cm3 20
After sudden devastation of system, cm3 40
Efforts of tightening of threaded connections, Nanometer
Cooling system
M111

Bolts of fastening of a casing of the thermostat

  • M6
10
  • M8
25
Nipple nut of the line of cooling of ATF on a radiator (model with AT) 20
Hollow bolt of nipple connection 20
Bolt of fastening of a krylchatka of the fan to the viscous coupling 10
Bolt of fastening of the viscous coupling to the bearing case (drags on by means of special adaptation) 40
Bolts of fastening of the water pump to an engine case
M6 10
M8 25
Bolt of fastening of a pulley of the water pump 10
M112/113
Bolts of fastening of a casing of the thermostat (M6) 10
Nipple nut of the line of cooling of ATF on a radiator 20
Hollow bolt of nipple connection on a radiator (M12x1.5) 30
Bolt of fastening of a krylchatka of the fan to the viscous coupling 10
Bolt of fastening of the viscous coupling to the bearing case (drags on by means of special adaptation) 40
Screws of fastening of the generator 42
Bolts of fastening of a damper of a natyazhitel of a belt of the drive of auxiliary units
To a natyazhitel 25
To the water pump 35
Self-cut bolts of fastening of the water pump to a GRM drive cover
M6
  • The carving is not cut
14
  • The carving is cut
10
M8
  • The carving is not cut
35
  • The carving is cut
25
Bolt of fastening of a pulley of the water pump 10
M612
Screws of fastening of the finishing panel of a cover of a head of cylinders 10
Screws of fastening of the finishing panel of the air distributor 10
Bolts of fastening of a casing of the thermostat (M6) 9
Hollow bolt of nipple connection on a radiator (the line of leak of oil) 30
Bolts of fastening of the water pump to a GRM drive cover
M6 14
M8 20
Bolt of fastening of a pulley of the water pump 35
M628
Bolts of fastening of a casing of the thermostat (M6) 9
Nipple nut of the line of cooling of ATF on the oil cooler 25
Hollow bolt of nipple connection of the line of cooling of ATF on the oil cooler 25
Hollow bolt of nipple connection on a radiator (the line of leak of oil) 30
Bolts of fastening of the water pump to an engine case 10
Bolt of fastening of a pulley of the water pump 25
Systems of heating/ventilation/air conditioning
Nuts of fastening of the dashboard to a partition of a motive compartment 8
Bolts of fastening of the dashboard to racks And 19
Bolts of fastening of the dashboard to the transmission tunnel 30
Nipple nut of fastening of a tube to the broad valve of the K/V system 10
Bolt of fastening of the refrigerator line to a receiver 10
Bolt of fastening of the refrigerator line to the condenser 20
Bolt of fastening of the broad valve to the evaporator heat exchanger 10

General information

Engine cooling system

All models of the cars considered in the present manual are equipped with the engine cooling system working with an excessive pressure with thermostatic management of circulation of working liquid. The water pump is fixed on the block of the engine and provides pumping of cooling liquid through a cooling path of the last. The stream of liquid washes regions of an arrangement of each of cylinders in the block then goes to a back part of the engine. The cooling channels laid in casting of the block and a head of cylinders provide intensive cooling of inlet and final ports, areas of installation of spark plugs and the directing plugs of final valves.

Since engine launch the cooling system passes through three modes of functioning: at the first stage until temperature of cooling liquid rose above a certain value, it circulates on a small circle from a working contour of which the radiator is excluded. In process of further warming up of liquid the dish-shaped valve of the voskozapolnenny thermostat entering the highway of system opens and the radiator is connected to a contour of circulation. Further, on reaching temperature of cooling liquid of the next control value, the thermosensitive sensor switch providing activation of the fan of the cooling system, forced which the additional air stream considerably increases efficiency of functioning of the heat exchanger of a radiator works.

The cooling system has a tight design and is densely closed by the cover of a radiator capable to maintain a certain excessive pressure that provides increase in a boiling point of cooling liquid and, respectively, efficiency of the heat sink through a radiator. At excess by internal pressure in system of some certain value, there is an overflowing of excess of cooling liquid on a connecting (overflow) tube in a broad tank. In process of cooling of system liquid automatically comes back from a tank to a radiator.

Gas station of cooling liquid in system is made through a mouth of a broad tank (see the Head of the Power supply system and production of the fulfilled gases) which at the same time acts also as the receiver accumulating in itself the excess of liquid which is forced out from a radiator.

In view of the listed features of a design, such cooling system received the name closed as in it any functional losses of working heat are excluded.

System of heating and ventilation

The system of heating consists of the fans and heat exchangers located in blocks of forward and back parts of salon. Hot cooling liquid passes through heat exchangers. When moving the handle of management of the modes of a heater located on the control panel valves open and hot air begins to come to interior of the car. If to turn on the heater fan, air will move in salon forcibly.

External air before getting to salon, is passed through special the filter, in the carburetor the main share of particles of dust settles. Replacement of the saloon filter has to be made on a regular basis according to the Schedule of routine maintenance of the car (see the Head of the Power supply system and production of the fulfilled gases). Violation of passability of the filter brings with decline in production of functioning of systems of heating/ventilation/air conditioning.

Distribution of streams of air of system of ventilation is carried out by means of gates. The possibility of switching of the modes of air circulation is provided. The drive of gates osushchestlvyatsya by means of servomotors.

Air conditioning system

See the Section General information and security measures.