SEAL 8M4990 - Caterpillar

Clean the cooling system before the recommended maintenance interval if the following conditions exist:
The engine overheats frequently.
The coolant is foaming.
Oil or fuel has entered the cooling system and the coolant is contaminated.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 g00728444
The cooling system drain is located behind the rear doors.
(1) Coolant drain
Illustration 2 g00739027
Location of the cooling system drain plugs
(2) Engine oil cooler
(3) Jacket water pump
(4) Cylinder block 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
Use of commercially available cooling system cleaners may cause damage to cooling system components. Use only cooling system cleaners that are approved for Caterpillar engines.
After the cooling system has been drained, flush the cooling system with clean water in order to remove any debris.
Close the cooling 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.
Fill the cooling system with a mixture of clean water and Caterpillar Fast Acting Cooling System Cleaner. Add .5 L (1 pint) of cleaner per 15 L (4 US gal) of the cooling system capacity. Install the radiator filler cap.
Open the water inlet for the separate circuit