Engines 3. Periodically check the coolant mixing ratio (concen- tration of antifreeze in the coolant). Add more if necessary. The coolant mixing ratio should never rise above 55 percent antifreeze. Caterpillar If the engine is in good mechanical condition and the precautions necessary for cold weather operation are taken, ordinary cold weather will not cause difficulty in starting or loss of efficiency. 4. Use low-viscosity lubricating oils for adequate lubri- cation. 5. At temperatures below 32°F (0°C), do not use summer-grade (2-D) diesel fuel. To avoid fuel prob- lems due to paraffin separation, use winter-grade (1-D or winterized 2-D) diesel fuel only.
If the engine does not start, prime the fuel system. For cold weather operation, use the following guide- lines: 1. When starting the engine in temperatures below 32°F (0°C), use engine lubricants of lower viscosity. See the engine operation and maintenance manual for specifications. WARNING The addition of kerosene lowers the flash point of diesel fuel. To prevent fire and risk of injuries due to burning, do not smoke or use open flames around fuel mixed with kerosene. Comply with all appropriate safety regulations. 2. When operating in temperatures below 32°F (0°C), use sufficient antifreeze solution in the cooling sys- tem to prevent freezing. 3.
During cold weather, give more attention to the con- dition of the batteries. Test them frequently to en- sure sufficient power for starting. Inspect all switches and connections in the electrical system and keep them in good condition to prevent losses through poor contacts. See Group 15 in the Busi- ness Class ® Trucks Service Manual for detailed information. 6. When winter-grade diesel fuel is not adequate, it is possible to mix kerosene with the diesel fuel. Add the kerosene only when refilling the tank, and be- fore adding the diesel fuel. NOTE: Engine power may drop according to the proportion of kerosene. For this reason, never add more than 50 percent kerosene to the fuel. 4.
If so equipped, turn off the battery disconnect switch after the engine is stopped to prevent battery discharge while the starter motor is cooling. 4.21