C9 Marine Auxiliary and Marine Generator Set Engines Caterpillar

Probable Causes

• Batteries

• Battery cables

• Starting circuit

• Starting motor solenoid

• Starting motor

• Shutdown switch

• Prelubrication system (if applicable)

• Faulty crank enable switch (if applicable)

• Flywheel ring gear

• Transmission

• Engine accessories

• Hydraulic cylinder lock

• Internal engine problem

Recommended Actions

Batteries and/or Battery Cables

1. Inspect the main power switch, battery posts, and battery cables for loose connections and for corrosion. If the battery cables are corroded, remove the battery cables and clean the battery cables. Tighten any loose connections.

2. Inspect the batteries.

   1. Charge the batteries. Refer to Special Instruction, SEHS7633, "Battery Test Procedure".

   2. Load test the batteries. Refer to Special Instruction, SEHS9249, "Use of 4C-4911 Battery Load Tester for 6, 8 and 12 Volt Lead Acid Batteries".

Starting Motor Solenoid or Starting Circuit

1. Check the operation of the engine start switch. Monitor the engine start switch on Cat ET.

   Refer to the appropriate troubleshooting test that is applicable to your engine if repairs are required.

2. Test the operation of the starting motor solenoid.

3. Check the wiring to the starting motor solenoid.

Starting Motor or Flywheel Ring Gear

1. Test the operation of the starting motor.

2. Inspect the solenoid on the starter and inspect the flywheel ring gear for damage.

Prelubrication System (if applicable)

If equipped, inspect the prelubrication system for proper operation.

Shutdown Switch

Use Cat ET to monitor the status of the engine. Check for "ACTIVE" shutdowns due to shutdown switches. Determine the cause for the "ACTIVE" shutdown and make any repairs necessary.

Crank Enable Switch (if applicable)

Ensure that the crank enable switch is not faulty.

Transmission or Engine Accessories

1. If the engine's application has a transmission neutral switch, test the operation of the transmission neutral switch. Ensure that the machine is in neutral gear before attempting to start the engine.

2. Ensure free movement of the driveline.

3. Ensure that the timing pin was not left in the flywheel housing.

4. Remove any engine accessories that may lock up the engine and inspect any engine accessories that may lock up the engine.

   The following list illustrates examples of engine accessories that may lock up the engine:

   • Hydraulic pump that is driven from the rear gear group

   • Air compressor

   • Engine oil pump

   • Other components that are driven by the engine

Hydraulic Cylinder Lock

Check for fluid in the cylinders (hydraulic cylinder lock) by removing the individual unit injectors.

Note: Drain the fuel from the cylinder head. Fuel will flow from the cylinder head into the cylinders when the unit injector is removed.

Internal Engine Problem

Disassemble the engine. Refer to the Disassembly and Assembly manual. Inspect the internal components for the following conditions:

• Seizure

• Broken components

• Bent components