HOUSING-REGULATOR 3299776 - Caterpillar

Caterpillar Diesel Truck Engines are designed to operate effectively in cold weather. However, engine operation in cold weather is dependent on the type of fuel used and how well the fuel flows through the fuel system. The purpose of this section is to explain some of the steps that can be taken to minimize fuel problems when the ambient (outside) temperature is below freezing.For more information, refer to SEBU6740, Cold Weather Recommendations for On-Highway Diesel Truck Engines, or contact your Caterpillar dealer.Fuel and the Effect from Cold Weather
The three types of diesel fuel available for your truck engine are typically grades No.1, No.2 or a blend of No.1 and No.2.There are three major differences between No.1 and No.2 diesel fuel. No.1 diesel fuel has a lower cloud point, a lower pour point and has a lower kJ (Btu) (heat content) rating than No.2 diesel fuel. The kJ (Btu) rating indicates power, therefore No.1 grade fuel will provide less power and fuel economy, but is less likely to plug filters and flows better through the fuel system. Keep in mind that No.1 grade fuel or fuel blends will not provide as much power as No.2 grade fuel. A difference may be noticed.Be aware of these fuel grades when purchasing your diesel fuel. Plan fuel purchases for cases of driving from warm climates into cold climates. Trucks that are fueled in one climate may not operate properly when driven to another climate.Fuel Filters
Use of an auxiliary primary fuel filter and/or water separator is required between the fuel tank and the engine mounted fuel filter. Refer to the Parts Manual for this engine to determine the part numbers required for a cold weather primary fuel filter.Winter Fronts/Shutters
Under normal conditions, Caterpillar discourages the use of, and does NOT recommend, winter fronts or other air flow restriction devices (shutters) mounted in front of radiators. These devices, if not used properly, can cause higher exhaust temperatures, power loss, excessive fan usage and a reduction in fuel economy.Winter fronts are properly used for overnight parking and very cold temperatures, along with high winds. In these cases, coolant and inlet manifold temperatures must be carefully monitored and controlled.
Failure to open the winter fronts in the morning could cause engine damage and/or loss of fuel economy.
For more information regarding cold weather operation maintenance tips and recommendations, refer to SEBU6740, Cold Weather Recommendations for On-Highway Diesel Truck Engines, or contact your Caterpillar dealer.