C175-20 Locomotive Engine Caterpillar

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Engine exhaust contains products of combustion which may be harmful to your health. Always start and operate the engine in a well ventilated area and, if in an enclosed area, vent the exhaust to the outside.

Note: When electric power is cycled, the electronic thermostat will cycle, which will make a unique sound that is a normal sound for a start-up.

Note: To operate the engine at different speeds, refer to this Operation and Maintenance Manual, "Engine Operation".

Manual Starting

Do not start the engine or move the controls if there is a lock out tag attached. Do not start the engine or operate controls if a "DO NOT OPERATE" or similar warning tag is attached.

Ensure that no one will be endangered when the engine is started.

1. Perform all the procedures that are described in this Operation and Maintenance Manual, "Before Starting Engine" (Operation Section).
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   NOTICE
   Do not engage the starting motor when flywheel is turning. Do not start the engine under load. If the engine fails to start within 30 seconds, release the starter switch or button and wait two minutes to allow the starting motor to cool before attempting to start the engine again.

2. Refer to Locomotive OEM publications on starting the engine.

For further information concerning the EMCP 3, refer to this Operation and Maintenance Manual, "Electronic Modular Control Panel 3 (EMCP 3)" topic.

Starting the Engine After an Overhaul or Major Repair

Use the following guidelines for operation and maintenance after an overhaul or a major repair. Using the guidelines will ensure that the engine is functioning correctly. The procedure for start-up requires approximately 1 hour and 30 minutes.

1. Perform the procedures that are described in this Operation and Maintenance Manual, "Before Starting Engine" topic (Operation Section).

2. Operate the jacket water heaters, if installed. Run the prelube pump and allow the lubricating oil to circulate for 10 minutes or less. To operate the prelube pump without starting the engine when the starting oil pressure is reached, perform the following: Access the service override file in Cat electronic technician (ET), override the prelube pump to ON.

   Note: Running the prelube pump for more than 10 minutes at a time risks overheating the pump electrical motor.

   To operate the prelube pump without starting the engine when the starting oil pressure is reached, perform the following:

1. Access the override tile in Cat electronic technician (ET)

2. Override the prelube pump to ON

3. During prelube pump operation, use the barring device to rotate the crankshaft for a minimum of two revolutions.

4. Start the engine. Operate the engine at low idle rpm for 15 minutes. Refer to this Operation and Maintenance Manual, "Engine Operation" for the procedure on starting and running the engine at low idle. Allow the engine temperature to rise. Check for the correct temperatures and pressures. Inspect the installation for leaks.

5. Do not apply the load. Increase the engine rpm to high idle rpm for 5 minutes. Check for the correct temperatures and pressures. Inspect the installation for leaks.

6. Shut off the engine. Remove the side covers. Measure the temperature of the bearings with a 123-6700 Laser Infrared Thermometer. Ensure that the large ends of the connecting rod bearings move freely. Visually inspect the piston skirts, cylinder liners, and bearings for any abnormal signs such as flaking and/or scuffing. If the appearance of the components is satisfactory, install the side covers.

7. Start the engine. Operate the engine at low idle rpm for 5 minutes. Check for the correct temperatures and pressures. Inspect the installation for leaks.

8. The temperatures will not stabilize for some time because the engine will be operating without a load. To warm the engine up to “normal” operating temperature, increase the engine rpm to high idle rpm for 5 minutes. Check for the correct temperatures and pressures. Inspect the installation for leaks.

   Note: Monitor the cooling system temperatures to ensure that the water to the engine is being properly cooled. Observe the water temperature of the aftercooler and oil cooler system. The temperature should not exceed 50 °C (122 °F).

9. Apply 25 percent of the rated load. Operate the engine with this load for 15 minutes. Check for the correct temperatures and pressures. Inspect the installation for leaks.

10. Increase the load to 50 percent of the rated load. Operate the engine with this load for 15 minutes. Check for the correct temperatures and pressures. Inspect the installation for leaks.

11. Increase the load to the full rated load. Operate the engine with this load for 15 minutes. Check for the correct temperatures and pressures. Inspect the installation for leaks.

    If all the temperatures and the pressures are acceptable, the engine can be returned service.

Note: Monitor the engine oil pressure while the pre-lube pump is on. If the engine oil pressure does not increase after several minutes, the engine oil pre-lube pump is not self-priming. To manually prime the pre-lube pump, loosen a fitting in the pump discharge line near the pump. Loosening a fitting allows air to vent from the line. The pump is primed once oil is detected at the loosened fitting. Tighten the fitting to prevent leaks. Monitor the engine oil pressure to ensure that the pressure increases.

Maintenance Procedures After an Overhaul or Major Repair

After the initial start-up, perform the maintenance that is listed in Table 1. See the maintenance procedures that are in this Operation and Maintenance Manual (Maintenance Section).

Starting the Engine After a System Generated Shutdown

Do not perform any procedure in this Special Instruction until you read this information and you understand this information.

This Special Instruction provides a procedure for inspecting the engine after a system generated shutdown.

The cause of a system generated shutdown must be corrected prior to an engine restart. Severe engine damage may occur if the problem is not corrected. Sometimes, the cause of the shutdown may be obvious and easily corrected. Sometimes, a visual inspection may not reveal the root cause of the shutdown. The engine must be started to determine the root cause.

Determining the root cause of a system generated shutdown to avoid engine damage is important. This procedure is a method for an engine restart when the root cause of the system generated shutdown cannot be determined by visual inspection alone.

Note: If the engine is shut down by the oil mist detector, refer to the engine Operation and Maintenance Manual.

The following conditions can cause a system generated shutdown.

• High aftercooler and oil cooler water temperature (inlet)

• High jacket water coolant temperature (outlet)

• High crankcase pressure

• High engine oil temperature

• High turbine inlet temperature

• Low engine coolant block inlet pressure

• Low engine oil pressure

• Overspeed

If the engine must be restarted, perform the following start-up procedure.

Starting Procedure

1. Inspect the condition and the level of all fluids. Correct any problem with the fluids.

2. Ensure that the engine is off-line or that the gearbox is in neutral.

3. Start and run the prelube pump, refer to "Starting the Engine After an Overhaul or Major Repair" step 2. Rotate the crankshaft with the barring device for a minimum of two revolutions.

4. Start the engine and allow the engine to run at low idle. Refer to this Operation and Maintenance Manual, "Engine Operation" for the procedure on starting and running the engine at low idle. Do not run the engine at high idle. Monitor the temperatures and pressures. Prepare to perform a manual engine shutdown if abnormal conditions exist.

5. Allow the engine to idle for 10 minutes. During engine idle, walk around the engine and visually inspect the engine. Check for leaks and listen for any abnormal sounds. If any abnormal conditions exist, immediately perform an engine shutdown and correct the problem. Go to the next step if no problems are found.

6. Increase the engine to high idle for 10 minutes. Refer to this Operation and Maintenance Manual, "Engine Operation" for the procedure on starting and running the engine at high idle. Monitor the temperatures and pressures. Prepare to perform a manual engine shutdown if abnormal conditions exist. Walk around the engine and visually inspect the engine. Check for leaks and listen for any abnormal sounds. If any abnormal conditions exist, immediately perform an engine shutdown and correct the problem. Go to the next step if no problems are found.

   Note: Due to the small amount of load on the engine, the temperature will not stabilize for some time. Apply an engine load to bring the engine up to normal operating temperatures.

7. Return the engine to low idle for 5 minutes. If all temperatures and pressures are acceptable, return the engine to service.