TURBOCHARGER GP 1272924 - Caterpillar

The Engine Will Not Crank
Probable Causes
Engaged barring device
Static load
Start/stop controls
Electrical system or interlocks
Problem with the starting motor
Prelube pressure
Fluid in the cylinder
Internal mechanical problemRecommended Repairs
Barring Device
The engine will not crank if the barring device is even slightly engaged. Make sure that the barring device is completely disengaged.Static Load
Make sure that the clutch is disengaged. Make sure that any other equipment that is driven by the engine is not preventing the crankshaft from turning. Attempt to turn the crankshaft with the barring device. If necessary, disengage the driven equipment and test the engine.Start/Stop Controls
Make sure that an emergency stop button is not engaged and reset the control system.Check the engine control switch for proper operation. Make sure that the contacts are correct when the switch is in different positions.Electrical System or Interlocks
Check the power supply for the control panel. Make sure that the voltage is not interrupted.Interlocks for the clutch, the prelube, and any other customer supplied interlocks can prevent start-up. Check the relays for proper operation.Inspect the electrical connectors for loose connections and corrosion. Inspect the harnesses for wiring that is pinched, frayed, or otherwise damaged. Make sure that the insulation is good. Tighten any loose connections. Make repairs, if necessary.Problem with the Starting Motor
Refer to "Starting Motor".Prelube Pressure
If prelube pressure is not achieved, the engine will not crank.The prelube pump's solenoid may have an open circuit or a short circuit. The prelube pump's motor may have an electrical problem. Inspect the electrical circuit of the prelube pump's pressure switch. Inspect the wiring for good condition and secure connections. Repair the wiring or replace the wiring.Check the prelube pump's pressure switch for proper operation. Remove the prelube pump's pressure switch. Measure the resistance between the switch's terminals. Then apply 9 3 kPa (1.3 0.4 psi) of pressure to the switch and measure the resistance between the terminals again. If the switch is operating correctly, the switch is open with no pressure and the switch closes with 9 3 kPa (1.3 0.4 psi) of pressure. If there is a problem with a switch, replace the switch.There may be a mechanical problem with the prelube pump. Repair the pump or replace the pump.Fluid in the Cylinder
Open the manual valves (if equipped). If the engine does not have manual valves, remove the cylinder pressure relief valves or the plugs. Keep all personnel away from the ports and use the barring device to rotate the crankshaft. Check for evidence of fluid from the ports.If fluid is found, determine the type of fluid.If the fluid is fuel, there is probably a problem with the fuel injector.If the fluid is coolant, there is probably a leak in the cylinder head. A seal or a gasket for a cylinder liner may be leaking.Internal Mechanical Problem
If the crankshaft will not turn and the driven equipment is disengaged, check for fluid in the cylinders. If this is not the problem, the engine must be disassembled in order to investigate internal mechanical problems. Possible internal