Engines temperatures to (–53°C). Contact the near- est Freightliner dealer or Cummins engine dealer, to obtain the special items required. permits sufficient rpm to be developed to start the engine. See "Lubricating Oil Recommendations" in the Detroit Diesel Owner’s and Operator’s Guide for specific recommendations. CAUTION 2. When an engine equipped with a DDEC system is started at temperatures below 25°F (–4°C), the idle speed automatically increases to 900 rpm. The in- jection timing is also advanced to decrease white smoke. As the engine oil warms up, the idle speed gradually decreases.
When the oil temperature reaches 122°F (50°C), both the idle speed and the injection timing return to normal. "Antileak" antifreezes are not recommended for use in Cummins engines. Although these antifreezes are chemically compatible with DCA water treatment, the "antileak" agents may clog the coolant filters. IMPORTANT: Fuel heaters used on vehicles with Cummins CELECT engine systems could cause high fuel temperatures that affect engine perfor- mance and operation of the electronic engine con- trols. If a fuel heater is used, make sure it has thermostatic controls. If the fuel heater has a timer, set the timer to activate only for a limited period of time before the engine starts.
Make sure the fuel heater is used only for starting the engine. 3. During cold weather, the batteries should be tested more frequently to ensure ample power for starting. All electrical connections should be tight and in good condition to prevent losses through loose or corroded connections. 4. The ether start system should be properly charged and in good working order. Detroit Diesel 5. Ethylene glycol base antifreeze is recommended. An inhibitor system is included in this type of anti- freeze, and the corrosion protection is sufficient as long as the recommended concentration range of 30 to 67 percent (antifreeze to water by volume) is employed.
Preparations made in advance of winter and mainte- nance performed during the cold months will help to ensure efficient engine starting and operation. 1. Engine oil thickens as it gets colder, slowing crank- ing speed. When cold, multigrade oil offers less re- sistance to the cranking effort of the engine and 6. If the engine is to be operated in arctic tempera- tures, consult the nearest Freightliner dealer or an 4.23