BUCKET AS-GENERAL PURPOSE 3914951 - Caterpillar

Probable Causes
Air inlet restriction
Starting aids
Coolant temperature sensor
Water temperature regulators
Engine speed/timing
Unit injectors
Flash file
Fuel supply
Component wear
Cooling systemRecommended Actions
Air Inlet Restriction
Check the air inlet system for restrictions. Refer to Systems Operation/Testing and Adjusting.Starting Aids
If the engine application is equipped with a jacket water heater, check for the proper operation of the heater control and the heater element. If necessary, repair the jacket water heater.
Check for the proper operation of the air inlet heater. Check for the proper operation of the heater control, the heater element, and the heater relay. If necessary, repair the air inlet heater.If a problem with the operation of the air inlet heater circuit is suspected, refer to the diagnostic functional test Troubleshooting, "Air Inlet Heater Circuit - Test".Coolant Temperature Sensor
Use the Caterpillar Electronic Technician (ET) to verify that the engine has exited cold mode.
Ensure that the coolant temperature that is reported from Cat ET is reasonable. If this coolant temperature is suspect, use a 6V-9130 Temperature Adapter (MULTIMETER) to confirm the accuracy.Water Temperature Regulators
Check the water temperature regulators for correct operation. Refer to Systems Operation/Testing and Adjusting.Engine Speed/Timing
Check the calibration of the engine speed/timing sensor. Refer to calibration procedures Troubleshooting, "Engine Speed/Timing Sensor - Calibrate".
Verify that the crankshaft and camshaft drive gears are set with the proper orientation. Refer to the Disassembly and Assembly.Unit Injectors
Perform the "Cylinder Cutout Test" on Cat ET in order to check the unit injectors and the performance of each cylinder. Refer to the diagnostic functional test Troubleshooting, "Injector Solenoid Circuit - Test".Flash File
Verify that the latest version of the ECM flash file has been installed. Refer to system configuration parameters Troubleshooting, "System Configuration Parameters".Fuel Supply
Inspect the condition of the fuel system components. Inspect each component for leakage and damage.
Check the fuel pressure during engine cranking. Check the filtered fuel pressure. Refer to Systems Operation/Testing and Adjusting for the correct pressure values. If the fuel pressure is low, replace the fuel filters. If the fuel pressure is still low, check the following items: fuel transfer pump, fuel transfer pump coupling and fuel pressure regulating valve.
Check the fuel quality. Low cetane fuel can create white smoke. If necessary, replace the fuel with a higher cetane fuel.
Cold weather adversely affects the characteristics of the fuel. Refer to the Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold weather operation.Component Wear
Check the engine for the following problems: Excessive valve wear, piston wear, ring wear, liner wear and reduced compression pressure.Cooling System
Check for an internal coolant leak into the cylinder and/or the exhaust. Refer to Systems Operation/Testing and Adjusting.