2.1.7. Cooling system
The liquid cooling system includes a radiator, a broad tank, the centrifugal water pump and the thermostat.
Water pump
The water pump is installed on the right side of the block of cylinders. On release cars till 1985 the drive of the water pump is carried out by a maple belt which at the same time puts in action the generator. On release cars since 1985 — the mnogoruchyevy belt bringing into rotation and other auxiliary units of the engine.
Maple belt of the drive of the generator
The tension of a belt is regulated by movement of the generator.
The tension of a belt is regulated automatically by movement of a tension roller. On engines M 102 for providing an initial tension of a belt it is necessary to combine an adjusting ledge with the 7th tag (or with the 5th for cars without hydraulic booster of steering) on a tension roller.
Characteristic |
Value |
Belt tension at measurement by means of Krikit adaptation, kgf |
|
|
50 |
|
40 — 45 |
Belt type |
Continental 9,5 1005La, Dayco 9,5 1000 |
The recommended belts of Bosch (in brackets catalog No. is specified) |
|
|
9,5x1005 (No. 1.987.947.625) |
|
9,5x940 (No. 1.987.947.600) |
|
9,5x940 (No. 1.987.947.600) |
|
9,5x930 (No. 1.987.947.609) |
Fan
Engine M 102
The drive of the fan is carried out by shaft of the water pump, and its inclusion and switching off — the electromagnetic coupling operated by the sensor of temperature or the thermodynamic coupling.
Electromagnetic coupling
Characteristic |
Value |
Temperature, °C |
|
|
98 — 102 |
|
93 — 98 |
Distance between a radiator and the fan, mm |
36 |
Radial gap between the fan and the directing casing, mm |
|
|
25 |
|
20 |
Diameter of the fan, mm |
380 |
Broad tank
Characteristic |
Value |
Pressure in the cooling system, kg/cm 2, no more |
1,0 — 1,2 |
Pressure of opening of the valve of a stopper, kg/cm 2 |
|
at an admission |
0,1 |
at release |
|
|
|
|
1,0 +0,15-0,1/1,0 +0 - 0,2 * |
|
1,2 +0-0,1/1,0 +0 - 0,2 * |
* In numerator value for the new valve, in a denominator — for reusable is specified.
Thermostat
Characteristic |
Value |
Temperature began opening of the main valve, °C |
87 |
Temperature of full opening of the main valve, °C |
102 |
The course of the main valve at a temperature of 102 °C, not less, than a mm |
8 |
Radiator
Radiator aluminum, with horizontal tubes.
Characteristic |
Value |
Brand |
Bechr. |
Cooling liquid
Characteristic |
Value |
Capacity of the cooling system, l |
8,8 |
The used cooling liquid |
mix of the distilled water and the antifreeze recommended by Mercedes-Benz (at a temperature up to -30 °C) |
Frequency of replacement |
each three years of operation |