Gen 5 DD Platform Operators Manual Cooling System A radiator/thermo-modulated fan cooling system is used on Detroit™ Gen 5 Heavy Duty engines. This system uses a water pump to circulate coolant within the engine. The thermostat controls the flow of coolant. The thermostat is mounted on the inlet side of the cooling system and regulates coolant flow from the radiator into the engine. The thermostat regulates coolant flow to control the temperature of the coolant within the coolant circuit. The following benefits are a result from regulating the coolant at the inlet temperature side of the engine:
Reduced thermal cycling of the engine Operating temperature is reached faster Improved vehicle heating because of better temperature regulation Always use coolants that meet Detroit™ specifications . Failure to maintain the cooling system at required concentrations or using coolants that do not meet Detroit™ specifications will result in premature wear or engine failure . For a listing of required cooling system service intervals, Refer to section "Preventive Maintenance Tables". The "How to Procedures" section of this manual contains additional information on "How to Select Coolants".
Electrical System Electrical System The electrical system used in Detroit™ Gen 5 Heavy Duty engines consists of a starting motor, starting switch, battery-charging alternator, storage batteries, and necessary wiring. For information on the Detroit Diesel Electronic Control (DDEC®) system Refer to section "Detroit Diesel Electronic Controls System". Engine Brake System Engine Brake System The Detroit™ Gen 5 Heavy Duty engine may be equipped with an engine brake. Before operating the vehicle, the operator must become familiar with the engine brake system to obtain optimum benefit from it.
The engine brake control systems may vary slightly, depending on the engine brake configuration and cab options design. However, basic operator controls are similar for all models. The Detroit Diesel Electronic Control® (DDEC®) system may activate or deactivate the engine brakes based on a number of monitored engine parameters. For information on engine brakes operation, Refer to section "How to Operate the Engine Brakes". All information subject to change without notice. 45 DDC-SVC-MAN-0217 Copyright © 2022 DETROIT DIESEL CORPORATION