GASKET 5H2669 - Caterpillar

Use only clean water to flush the cooling system when Extended Life Coolant (ELC) is drained and replaced.Drain the Cooling System
Stop the engine and allow the engine to cool. Close the water inlet for the separate circuit aftercooler. Ensure that the engine will not start when the cooling system is drained.
Loosen the radiator filler cap slowly in order to relieve any pressure. Remove the radiator filler cap.
Illustration 1 g03643539
The cooling system drains are located behind the rear doors.
(1) Coolant drain valve for the jacket water heater
(2) Coolant drain valve for the separate circuit aftercooler (SCAC)
Illustration 2 g03646511
Location of the cooling system drain plugs
(3) Engine oil cooler
(4) Jacket water pump
(5) Cylinder block
(6) SCAC pump plug
(7) SCAC thermostat housing plugs Note: If the engine has a jacket water heater, drain the coolant from the heater.
Open the coolant drain. Remove the cooling system drain plugs. Allow the coolant to drain.
Dispose of used engine coolant properly or recycle. Various methods have been proposed to reclaim used coolant for reuse in engine cooling systems. The full distillation procedure is the only method acceptable by Caterpillar to reclaim the used coolant.
For information regarding the disposal and the recycling of used coolant, consult your Cat dealer or consult Caterpillar Service Technology Group:Outside U.S.A. (309) 675-6277
Inside U.S.A. 1-800-542-TOOL
Inside Illinois 1-800-541-TOOL
Canada 1-800-523-TOOL
CSTG COSA Geneva, Switzerland 41-22-849 40 56
Clean the Cooling System
After the cooling system has been drained, flush the cooling system with clean water in order to remove any debris.
Close the coolant system drain. Clean the cooling system drain plugs and install the cooling system drain plugs.
Fill the cooling system no faster than 19 L (5 US gal) per minute to avoid air locks.
Open the water inlet for the separate circuit aftercooler (if equipped). Fill the cooling system with clean water. Install the radiator filler cap. Operate the engine until the temperature reaches 66 °C (150 °F).
Stop the engine and allow the engine to cool. Close the water inlet for the separate circuit aftercooler (if equipped). Ensure that the engine will not start when the cooling system is drained. Loosen the radiator filler cap slowly in order to relieve any pressure. Remove the radiator filler cap.
Open the cooling system drain. Remove the cooling system drain plugs. Allow the coolant to drain. Flush the cooling system with clean water. Close the cooling system drain. Install the cooling system drain plugs.
Repeat Steps 3, 4, and 5. Fill the Cooling System
Note: For information about the proper coolant to use, see this Operation and Maintenance Manual, "Coolant Recommendations" (Maintenance Section). For the capacity of the cooling system, see this Operation and Maintenance Manual, "Refill Capacities" (Maintenance Section).
Fill the cooling system no faster than 19 L (5 US gal) per minute to avoid air locks.
Fill the cooling system with Extended Life Coolant (ELC). After filling the cooling system, do not install the radiator filler cap.
Open the water inlet for the separate circuit aftercooler (if equipped). Start the engine. Operate the engine in order to purge the air from the cavities of the engine block.