VALVE GP-CHECK 3046756 - Caterpillar

This engine has a pressure type cooling system. A pressure type cooling system gives two advantages. First, the cooling system can be operated safely at a temperature that is higher than the boiling point of water. Next, cavitation in the water pump is prevented. It is more difficult for air or steam pockets to be made in the cooling system.Radiator Cooled System
Illustration 1 g00455646
An example of a radiator cooled system 3412C shown (1) Turbochargers. (2) Aftercooler. (3) Temperature regulator housings. (4) The outlet from the temperature regulator housing to the radiator top (one on each side of the engine front). (5) Radiator. (6) Outlet bonnet of the oil cooler. (7) Engine oil cooler. (8) Line to the aftercooler. (9) Inlet bonnet of the oil cooler. (10) Water pump. (11) The water pump inlet from the radiator bottom. (12) Radiator bypass lines.
Illustration 2 g00332176
Cooling system components 3412C shown (1) Turbocharger. (2) Aftercooler. (3) Temperature regulator housing. (4) Outlet to the radiator top. (6) The outlet bonnet of the oil cooler. (7) Engine oil cooler. (8) Line to the aftercooler. (9) Inlet bonnet of the oil cooler. (10) Water pump. (11) The water pump inlet from the bottom of the radiator. (12) Radiator bypass lines.In normal operation, the water pump (10) sends the coolant from the radiator (5) to the engine oil cooler (7). The coolant then flows to the cylinder block. The coolant then flows through the cylinder block to both of the cylinder heads. The coolant then flows to the housings for the temperature regulators (3). When the temperature regulators are open, most of the coolant flows to the radiator (5) through the outlet (4). The coolant becomes cooler as the coolant moves through the radiator. When the coolant goes to the bottom of the radiator, the coolant goes through the water pump inlet (11) .Note: The water temperature regulator is an important part of the cooling system. The water temperature regulator divides the coolant flow between the radiator (5) and the bypass lines (12). This will maintain the correct temperature. There is no mechanical control if the water temperature regulator is not installed in the system. The coolant will take the path of least resistance and the coolant will go through the bypass. This will cause the engine to overheat in hot weather. In cold weather, a small amount of coolant that goes through the radiator is too much coolant. The engine will not reach normal operating temperatures.The water temperature regulator is closed when the engine is cold. The coolant flows through the temperature regulator housing (3) through the radiator bypass lines (12) and back to the water pump (10) .Engines that are equipped with an aftercooler will divide the coolant flow. Part of the coolant will flow to the engine oil cooler and part of the coolant will flow through line (8) to the aftercooler. From the aftercooler, the coolant flows through the block, through the heads and back to the regulator.If the engine is not equipped with