C175-16 Locomotive Engines Coolant (DEAC) - Change Caterpillar

Clean the cooling system before the recommended maintenance interval if the following conditions exist:

• The engine overheats frequently.

• Foaming is observed.

• Oil has entered the cooling system and the coolant is contaminated.

• Fuel has entered the cooling system and the coolant is contaminated.

Illustration 1	g06012737
C175 Right Side View (1) Coolant drain (2) Coolant sampling port (3) Coolant drain (4) Coolant drain

Illustration 2	g06012772
C175 Left Side View (1) Coolant drain (2) Coolant sampling port (3) Oil cooler coolant drain (4) Coolant drain (5) Oil cooler drain (6) Engine block coolant drain (7) Coolant drain

Drain the Cooling System

1. Drain the Cooling System

2. Loosen the cooling system filler cap slowly to relieve any pressure. Remove the cooling system filler cap.

3. Open the cooling system drain valves (if equipped). If the cooling system is not equipped with drain valves, remove drain plugs . Allow the coolant to drain.

4. Ensure that the jacket water drain valve is in the closed position before removing drain plug . Remove jacket water drain plug . Remove the O-ring seal. Install a new O-ring seal and a connector.

5. Attach a hose adapter and a hose with an inner diameter of 25 mm (1 inch).

6. Open the drain valve and allow the coolant to drain away from the electrical panel.

For information regarding the disposal, recycling, and the parts required to drain the coolant, consult yourCat dealer, or Dealer Service Tools Group:

Clean the Cooling System

1. After the cooling system has been drained, flush the cooling system with clean water to remove any debris.

2. Close the cooling system drain valves (if equipped). Clean the drain plugs and install the drain plugs.
   Show/hide table

   NOTICE
   Use of commercially available cooling system cleaners may cause damage to cooling system components. Use only cooling system cleaners that are approved for AVSpare engines.

3. Fill the cooling system with a mixture of clean water and Cat Fast Acting Cooling System Cleaner. Add .5 L (1 pt) of cleaner per 15 L (4 US gal) of the cooling system capacity. Install the cooling system filler cap.

4. Start the engine. Operate the engine for a minimum of 30 minutes with a coolant temperature of at least 82 °C (180 °F).

5. Stop the engine and allow the engine to cool. Loosen the cooling system filler cap slowly to relieve any pressure. Remove the cooling system filler cap. Open the cooling system drain valves (if equipped) or remove the drain plugs.
   Show/hide table

   NOTICE
   Improper or incomplete rinsing of the cooling system can result in damage to copper and other metal components. To avoid damage to the cooling system, make sure to completely flush the cooling system with clear water. Continue to flush the system until all signs of the cleaning agent are gone.

6. Allow the water to drain. Flush the cooling system with clean water until the water that drains is clean. Close the cooling system drain valves (if equipped). Clean the drain plugs and install the drain plugs.

Cleaning a Cooling System that has Heavy Deposits or Plugging

Note: For the following procedure to be effective, there must be an active flow through the cooling system components.

1. After the cooling system has been drained, flush the cooling system with clean water to remove any debris.

2. Close the cooling system drain valves (if equipped). Clean drain plugs and install the drain plugs .

3. Fill the cooling system with a mixture of clean water and Cat Fast Acting Cooling System Cleaner. Add .5 L (1 pt) of cleaner per 3.8 L to 7.6 L (1 to 2 US gal) of the cooling system capacity. Install the cooling system filler cap.

4. Start the engine. Operate the engine for a minimum of 90 minutes with a coolant temperature of at least 82 °C (180 °F).

5. Stop the engine and allow the engine to cool. Loosen the cooling system filler cap slowly to relieve any pressure. Remove the cooling system filler cap. Open the cooling system drain valves (if equipped) or remove the drain plugs. Allow the water to drain.
   Show/hide table

   NOTICE
   Improper or incomplete rinsing of the cooling system can result in damage to copper and other metal components. To avoid damage to the cooling system, make sure to completely flush the cooling system with clear water. Continue to flush the system until all signs of the cleaning agent are gone.

6. Flush the cooling system with clean water until the water that drains is clean. Close the cooling system drain valves (if equipped). Clean the drain plugs and install the drain plugs.

Fill the Cooling System

Illustration 3	g03071136
C175 16 and 20 cylinder (2) Jacket water vent

Illustration 4	g02358597
(1) SCAC vent (2) Jacket water vent

Illustration 5	g02361196
(1) SCAC vent (2) Jacket water vent

Note: For information about the proper coolant to use and the capacity of the cooling system, see this Operation and Maintenance Manual, "Refill Capacities and Recommendations" (Maintenance Section).

1. Ensure that an active vent is installed on the front vent port at the coolant bypass line for the Jacket Water system (2) illustration 3.

2. Ensure that the SCAC vent plugs (1) and the jacket water vent plugs (2) are loosened prior to filling.

3. Fill the cooling system with an antifreeze/coolant solution. Do not install the cooling system filler cap.

4. Tighten the vent plugs after air has been purged from the cooling system.

5. Start the engine.

6. Check the coolant level. Maintain the coolant to the proper level on the sight gauge (if equipped). If a sight gauge is not equipped, maintain the coolant within 13 mm (0.5 inch) below the bottom of the filler pipe. Refer to Operation and Maintenance Manual, "Coolant Level - Check".

7. Clean the cooling system filler cap. Inspect the gaskets of the cooling system filler cap. If the gaskets of the cooling system filler cap are damaged, discard the old cooling system filler cap and install a new cap. If the gaskets of the cooling system filler cap are not damaged, use a 9S-8140 Pressurizing Pump to test the cap. The correct pressure is stamped on the face of the cooling system filler cap. If the cooling system filler cap does not maintain the correct pressure, install a new cooling system filler cap.

8. Inspect the cooling system for leaks and for proper operating temperature.