GF09.41-P-3104M Charge Air Cooling System, Function

GF09.41-P-3104M Charge Air Cooling System, Function
- ENGINE 275.950 in MODEL 215, 220
- ENGINE 275.951 in MODEL 230 up to Model Year 8
- ENGINE 275.953 in MODEL 216, 221 up to Model Year 8
- ENGINE 275.954 in MODEL 230 up to Model Year 8
- ENGINE 275.980 in MODEL 215, 220
- ENGINE 275.981 in MODEL 230 up to Model Year 8
- ENGINE 275.982 in MODEL 216, 221 up to Model Year 8
- ENGINE 285.950 in MODEL 240
- ENGINE 285.980 in MODEL 240





Shown is model 240
5/1 Charge air cooler, left cylinder bank
5/2 Charge air cooler, right cylinder bank
110/11 Low-pressure cooler
110/12 Feed line to low temperature cooler
110/13 Return line to low temperature cooler
M44 Charge air cooler circulation pump (on model 215, 220, 221, 230 mounted in feed line 110/12)
A Service valves

The cooled air downstream of the charge air coolers has a higher density. This increases the cylinder charge and thus the engine output. In addition, the tendency to knock and NOX formation is reduced by the low exhaust gas temperatures

The maximum boost pressure becomes available only when the charge air temperature is lower than 70 °C. The charge air temperature sensor detects the temperature (B17/8) at the intake manifold.

A water/charge air cooler is built into each cylinder bank. Both water/ charge air coolers are connected to the low temperature cooling circuit with low temperature cooler and electric circulation pump (M44). The circulation pump (M44) is actuated via the charge air cooler circulation pump relay by the engine control unit in the following manner:
- Switching on at a charge air temperature above approx. 47 °C
- Switching off at a charge air temperature below approx. 35 °C

The function of the charge air cooler is fully dependent on the air bubble free filling of the low temperature cooling circuit. A special tool (vacuum pump) is required for filling and the work instructions must be followed carefully.

Open the cap at the low temperature coolant circuit only when the charge air temperature is increased (power shortage) and the engine is cold. The coolant must reach up to the cap.