GUIDE-VALVE 1004996 - Caterpillar

Caterpillar Diesel EnginesGenerally, the cranking speed needed to start Caterpillar diesel engines is in the range of 100-120 RPM. When warm, the engines will start at a lower cranking speed. In cold temperatures, battery, starting motor, glow plugs, oil viscosity, starting aids (ether, jacket water heater) and type of fuel used have an effect on how rapidly the engine will start. At all times, the engine must be in good condition to start at the normal cranking speed.
For more details see: The Operation, Lubrication And Maintenance Guide-"Cold Weather Operation", Form No. SEBU5338-02, 7/79; Special Instruction-"Installation, Operation And Maintenance Of 9N3771 Injection Group (Cetane)", Form SEHS7253; the article, "Preparation Of Truck Engines For Cold Weather Operation" in the Service Magazine, October 17, 1977, page 2 and Supplement in the Service Magazine, December 5, 1977, page 8; also, the article, "Important Cold Weather Recommendations For Series 'G' Motor Graders" in the Service Magazine, November 14, 1977, page 2.