4.2.11 Cooling system
1 Connection, LT circuit vent
line
2 Connection, HT circuit vent
line
3 Space heater supply con-
nection
4 Space heater return con-
nection
5 Engine coolant outlet to en-
gine coolant cooler
6 Engine coolant cooler
7 Engine coolant inlet from
engine coolant cooler
8 Charge-air coolant outlet to
charge-air coolant cooler
9 Charge-air coolant cooler
10 Charge-air coolant inlet
from charge-air coolant
cooler
11 Charge-air coolant pump
12 Charge-air coolant drain
plug
13 Charge-air coolant expan-
sion tank, LT
14 Engine coolant expansion
tank, HT
15 Engine coolant pump
16 Engine coolant drain plug
17 Restrictor
18 Lube-oil heat exchanger
19 Crankcase
20 Engine coolant preheater in-
let
21 Coolant manifold
22 Intercooler
23 Engine coolant preheater
outlet
24 Thermostat, HT circuit
25 LT thermostat
P = Pressure measuring point
T = Temperature measuring
point
Technology
• Two separate cooling circuits:
– Engine coolant HT (high-temperature)
– Charge-air coolant LT (low-temperature)
• Coolant cooling by:
– Electrically driven cooling fans
– Mechanically driven fan cooler
– Water/water heat exchanger (e.g. plate-core heat exchanger)
• Thermostat-controlled coolant circuit
• Coolant-cooled / preheated charge-air
MS15065/01E 2019-01
| Series 4000 Engines | 61
TIM-ID: 0000072882 - 001
