3116 and 3126 HEUI Truck Engines Cooling System Coolant (DEAC) – Change

NOTE: Before performing this maintenance, determine the type of coolant that is being used. This maintenance applies ONLY to cooling systems that are filled with conventional heavy duty coolant/antifreeze such as Caterpillar Diesel Engine Antifreeze/Coolant (DEAC).

Clean the cooling system before the recommended maintenance interval if:

* Coolant is heavily contaminated
* The engine overheats frequently
* Foaming is observed in the radiator
* The oil cooler has failed, allowing oil to contaminate the coolant
* Fuel has entered the cooling system and contaminated the coolant
NOTE: A good time to inspect the water pump, replace the water temperature regulator, and replace hoses is when your engine’s cooling system has been drained.

Drain the Coolant

1. Stop the engine and allow the engine to cool. Loosen the radiator filler cap slowly to relieve any pressure. Remove the radiator filler cap.

2. Remove the cooling system drain plug(s) or open the drain valve. Open the cab heater valve to drain coolant from the cab heater. Remove the drain plug from the bottom of the water pump housing. Remove the drain plug from the bottom of the radiator. Allow the coolant to drain.
For information regarding disposal and recycling of used coolant, call:

Caterpillar Service Technology Group:

Outside Illinois: 1-800-542-TOOL

Inside Illinois: 1-800-541-TOOL

Canada: 1-800-523-TOOL

Clean the Cooling System

1. Flush the cooling system with clean water to remove any debris.

2. Clean and install all drain plugs and/or close the drain valve(s).
3. Fill the cooling system with a mixture of clean water and Caterpillar Fast Acting Cooling System Cleaner. Add .5 L (1 pt) of cleaner per 15 L (4 US gal) of cooling system capacity. Install the radiator filler cap.

4. Start and run the engine for a minimum of 30 minutes with the coolant temperature at a minimum of 82°C (180°F). Stop the engine and allow the engine to cool.

5. Loosen the radiator filler cap slowly to relieve any pressure. Remove the radiator filler cap. Remove the cooling system drain plug(s) or open the drain valve(s). Allow the cleaning solution to drain. Flush the cooling system with clean water until the draining water is clear. Clean and install all drain plugs and/or close the drain valve(s).

Cooling Systems with Heavy Deposits or Plugging

NOTE: For the following procedure to be effective, there must be some active flow through the radiator and the other cooling system components.

Follow the same steps as outlined above, with the following modifications to steps 3 and 4:

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

4. Start and run the engine for a minimum of 90 minutes with the coolant temperature at a minimum of 82°C (180°F). Stop the engine and allow the engine to cool.

Fill the Cooling System

Refer to the Coolant Specifications for all information regarding coolant/antifreeze requirements. Refer to the Refill Capacities chart in this publication for the capacity of your engine’s cooling system.
1. Fill the cooling system with the recommended coolant/antifreeze mixture.

2. Start and run the engine with the radiator filler cap removed. Allow the coolant to warm, the water temperature regulator to open and the coolant level to stabilize. Check the coolant level. Add coolant mixture if necessary to bring the coolant to within 13 mm (1/2 inch) below the bottom of the fill pipe or to the correct level on the sight glass (if equipped).

3. Check the condition of the radiator filler cap. If the gaskets are damaged, replace the old radiator filler cap with a new radiator filler cap. If the gaskets are not damaged, use a 9S-8140 Pressurized Pump Group to pressure test the radiator filler cap. The correct pressure is stamped on the face of the radiator filler cap. If the radiator filler cap does not hold the correct pressure, install a new radiator filler cap.

4. Start the engine. Inspect for coolant leaks and proper operating temperature.

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