ELBOW 0307946 - Caterpillar

Illustration 1 g01822615
Cooling system schematic of a sea water aftercooled system (1) Fuel cooler (2) Heat exchanger (3) Gear oil cooler (4) Water temperature regulator (5) Exhaust riser (6) Exhaust manifold (7) Jacket water pump (8) Turbocharger (9) Charge Air Cooler (CAC) (10) Cylinder head (11) Auxiliary sea water pump (12) Cylinder block (13) Engine oil cooler (14) Sea water inlet (15) Sea water outlet
Illustration 2 g01822616
Schematic of a keel cooled separate circuit aftercooled system (16) Auxiliary engine mounted expansion tank (17) Jacket water engine mounted expansion tank (18) Jacket water keel cooler (19) Fuel cooler (20) Auxiliary water pump (21) Water temperature regulator (22) Jacket water pump (23) Exhaust manifold (24) Exhaust riser (25) Auxiliary keel cooler (26) Turbocharger (27) Charge Air Cooler (CAC) (28) Cylinder head (29) Gear oil cooler (30) Cylinder block (31) Engine oil cooler
Illustration 3 g01824395
(32) Expansion Tank with a pressure relief cap (33) Recovery Bottle with a vented capThis engine has a pressure type cooling system that is equipped with an expansion tank (32) and a recovery bottle (33) .A pressure type cooling system offers two advantages:
The cooling system can operate safely at a temperature that is higher than the normal boiling point of water.
The cooling system prevents cavitation in the water pump.Cavitation is the sudden formation of low pressure bubbles by mechanical forces in liquids. The formation of air or steam pockets is more difficult within a pressure type cooling system.The shunt line prevents cavitation by the water pump. The shunt line provides additional flow of coolant to the water pump inlet.The recovery bottle (33) provides space for expansion of the coolant volume while the engine is running. Also, the recovery bottle provides space for expansion during the warm up cycle. The recovery bottle also provides a means for checking the coolant level.Raw Water Circuit
In many instances, a separate cooling source is used to supply coolant to the aftercooler. The coolant supply can be fresh water, or the coolant supply can be sea water. Because of the possible unknown composition of the cooling water, a special pump is needed to move the coolant through the system. Two types of pumps are available for use in the raw water circuit.
A bronze impeller and/or a rubber impeller pump is used to flow sea water through the cooling system. These types of pumps will resist the corrosive action of the coolant that passes through the pump. Raw water is drawn in through the inlet of the auxiliary water pump . The raw water is forced out of the pump and into the aftercooler. The raw water flows through the aftercooler in order to cool the inlet air. The raw water then exits the aftercooler and travels through the heat exchanger that cools the jacket water and fuel if the engine is equipped with a fuel cooler. The raw water is then discharged or passed through the gear oil cooler (if equipped) and then discharged.Coolant Flow Circuit
Water pump (7) is located on the right front corner of the