MANIFOLD-EXHAUST 3111172 - Caterpillar

Probable Causes
Diagnostic codes
Event codes
ECM power supply
Oil level
Starting aids
Engine shutdown switches
Engine speed/timing
Injection actuation pressure
Unit injectors
Fuel supply
CombustionRecommended Actions
Diagnostic Codes, Event Codes, and ECM Power Supply
Certain diagnostic codes and/or event codes may prevent the engine from starting. Connect the Caterpillar Electronic Technician (ET) and check for active codes and/or logged codes. Troubleshoot any codes that are present before continuing with this procedure.Note: If Cat ET will not communicate with the ECM, the problem is most likely with the electrical power supply to the ECM. Refer to Troubleshooting, "Electrical Power Supply Circuit - Test".Oil Level
Check the engine oil level. If necessary, add oil.Note: Engine oil supplies the injection actuation pressure circuit. Proper engine oil level is necessary for fuel injection.Starting Aids
Air Inlet Heater (If Equipped)
Ensure that the air inlet heater is functioning properly. For additional information, refer to Troubleshooting, "Air Inlet Heater Circuit - Test".Ether Injection System (If Equipped)
Ensure that the ether injection system is programmed to "On". For additional information, refer to Troubleshooting, "Ether Injection System - Test".Oil Grade Plugs
Ensure that the correct oil grade plug is installed. The oil grade plug should match with the oil that is installed in the engine. Do not program the "Engine Oil Weight" with Cat ET.Engine Shutdown Switches (If Equipped)
The engine shutdown switches should be in the OFF position. Use Cat ET to verify the status of the shutdown switches. When a shutdown occurs, the keyswitch must be turned to the OFF position for at least 15 seconds before restarting the engine.Note: If Cat ET will not communicate with the ECM, the problem is most likely with the electrical power supply to the ECM. Refer to Troubleshooting, "Electrical Power Supply Circuit - Test".Engine Speed/Timing
Crank the engine and observe the status for engine speed on Cat ET. If Cat ET indicates 0 rpm, refer to Troubleshooting, "Engine Speed/Timing Sensor Circuit - Test".Note: Upon initial cranking, the status for engine speed may indicate that the engine speed signal is abnormal. This message will be replaced with an engine speed once the ECM is able to calculate a speed from the signal.
Ensure that the timing reference gear is installed correctly. The engine will not start if the gear was installed backward. Check for proper orientation between the crankshaft and camshaft drive gears. Correct the orientation and/or replace the drive gear, if necessary. Refer to Disassembly and Assembly, "Camshaft - Remove and Install".Injection Actuation Pressure
Ensure that the injection actuation pressure is adequate for the engine to start. Refer to Troubleshooting, "Injection Actuation Pressure - Test".Unit Injectors
Perform the "Injector Solenoid Test" on Cat ET in order to determine if all of the injector solenoids are being energized by the ECM. Refer to Troubleshooting, "Injector Solenoid Circuit - Test" for additional information.Fuel Supply
Visually check the fuel level. Do not rely on the fuel gauge only. If necessary, add fuel. If the engine has been run out of fuel, it will be necessary to purge the air from the fuel system. Refer to Testing and Adjusting, "Fuel System - Prime" for