COUPLING-EXHAUST 7C1371 - Caterpillar

Clean the cooling system before the recommended maintenance interval if the following conditions exist:
The engine overheats frequently.
Foaming is observed.
The oil has entered the cooling system and the coolant is contaminated.
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.
Draining the Cooling System
Stop the engine and allow the engine to cool. Ensure that the engine will not start when the cooling system is drained.For information regarding the disposal and the recycling of used coolant, consult your Cat dealer or consult Cat Dealer Service Tools:Outside Illinois 1-800-542-TOOL
Inside Illinois 1-800-541-TOOL
Canada 1-800-523-TOOL
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.
Draining the Jacket Water
Loosen the cooling system filler cap slowly in order to relieve any pressure. Remove the cooling system filler cap.
Illustration 1 g00760198
Locations of the drain plugs
(1) Oil cooler
(2) Cylinder block
Illustration 2 g01014186
(3) Drain plug in the elbow before the water pump Note: If the engine is equipped with a jacket water heater, a water line will be installed in the location of drain plug (2).
Open the cooling system drain valves (if equipped). If the cooling system is not equipped with drain valves, remove drain plugs (1), (2), and (3). Drain the coolant from the bottom of the jacket water heater (if equipped).Draining the Separate Circuit
Remove the cooling system filler cap.
Drain the water from the heat exchanger or the radiator. 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 cooling system drain valves (if equipped). Clean the drain plugs and install the drain plugs.