R2.8 CM2220 R101B Cooling System Section 1 - Installation by Subsystem Page 1-17 Figure 1 - Engine Cooling System 1 Radiator 2 Deaeration tank 3 Upper radiator hose 4 Water outlet, 42 mm [1.65 in] 5 Radiator vent line 6 Engine vent line, 1/8 in NPT 7 Water pump inlet, 50 mm [1.96 in] 8 Lower radiator hose The engine at full power will generate 60 Kw [3400 BTU/min] of heat. The radiator can dissipate the heat generated by the engine via ambient air flowing through the radiator during vehicle motion, or by pulling the air through radiator cooling fans. 9 Fill line to lower radiator hose.
The radiator/fan system must be designed to enable the vehicle to be used at the ambient temperatures desired and not exceed the 107° C [225° F] maximum engine temperature. Electric fan control wiring is provided in the engine side harness. Although three wires are in the fan control wiring harness, only the high speed signal yellow wire, pin 33, and the ground white wire, pin 34, are active. The third wire, low speed signal green wire, pin 35, is not used on the R2.8 CM2220 R101B. Two speed electric, 3 wire, fan drives are not supported. To buy Cummins Parts and Service Manuals, Training Guides, or Tools go to our website at https://store.cummins.com