Don’t neglect proper cold-weather care for Auxiliary Power Units (APUs) with single-cylinder diesel engines. The experts at Frigette Truck Climate Systems offer these guidelines to help maximize generator performance:
Oil: Use oils designed for cold temperatures that lower the pour point. For temperatures of -10 to -20 degrees F, use a multi-grade SAE 5W40 viscosity lubricant.
Fuel: Use Winter Grade diesel fuel. A choice of No. 1-D (ASTM D975-94) diesel fuel is recommended. When temperatures are very low, or if using any biofuel, use an additive to prevent “gelling” that may inhibit fuel flow.
Battery: Keep parasitic loads to a minimum. Inspect ground wires and battery cable lug connections for clean, non-corroded and secure attachments.
Coolant: Use only a 50/50 mix of H2O and ethylene glycol. Foam hose wrap will insulate coolant water lines to protect them from heat loss in cold temperatures.
Filters: Keep water out of the fuel system. Replace the fuel filter element on the APU engine and the in-line fuel filter cartridges with clean ones. Ensure that clogged air filter elements are cleaned or replaced.
Water valve: Ensure that the servo arm of the coolant water valve is free to move. Rotate the temperature dial on the control panel back and forth once a week.
Truck sleeper heater: Optimize heating in the truck sleeper berth by closing the bunk curtains during generator operation. Make sure there are no restrictions to the air delivery components in the sleeper berth. The under-bunk unit must be free to breathe. Make sure conduit hoses are not buckled, folded, crushed or blocked.
