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

GF09.41-P-3104MOR Charge Air Cooling System, Function
- ENGINE 275.9 in MODEL 230.4 as of model year 2009 / AEJ 08 model refinement package

Charge air cooling function requirements - general
- Circuit 87M ON (engine control ON)
- Engine running

Charge air cooling - general
The charge air cooling holds the charge air temperature below 70°C. The cooled air downstream of the charge air coolers has higher density. This increases the cylinder charge, and therefore engine performance. It also lowers the tendency to knock and the formation of NO X is reduced by the lower exhaust temperatures.

One water/charge air cooler is installed for each cylinder bank. Both water/charge air coolers are connected to the low-temperature cooling circuit with low-temperature cooler and circulation pump charge air cooler (M44).

Charge air cooling function sequence
If the charge air temperature is above 47°C, the ME -SFI [ME] control unit (N3/10) actuates the charge air cooler circulation pump through the charge air cooler circulation pump relay (K60).

If the charge air temperature falls below 35°C, the charge air cooler circulation pump is switched off again.

The charge air temperature in the intake manifold is detected by the charge air temperature sensor (B17/8) and sent to the ME-SFI [ME] control unit (N3/10) in the form of a voltage signal.

The charge air cooling function crucial depends on bubble-free filling of the low-temperature cooling circuit. A special tool (vacuum pump) is required for filling this circuit.

Only open the cap on the low-temperature coolant circuit when the charge air temperature is increased (lack of power) and the engine is cold. The coolant must reach up to the cap.





Shown on charge air cooling model 240
5/1 Charge air cooler, LH cylinder bank
5/2 Charge air cooler, RH 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 230, located in the feed line 110/12)
A Service valve