PUMP GP-ENGINE OIL 4964800 - Caterpillar

Illustration 1 g01040648
(1) Recovery Bottle with a vented cap
(2) Expansion Tank with a pressure relief capA 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 (1) provides space for expansion of the coolant volume while the engine is running. Also, the recovery bottle provides space for expansion during the warmup cycle. The recovery bottle also provides a means for checking the coolant level.Raw Water Circuit
Raw water is drawn in through the inlet of the auxiliary water pump. The raw water will flow through the fuel cooler if the engine is equipped with the optional fuel cooler. Then raw water is forced into the aftercooler. The raw water flows through the aftercooler and exits at the end of the aftercooler. The raw water then travels through the marine gear cooler (if equipped), the heat exchanger, and the exhaust elbow (if equipped). The raw water is then discharged.Coolant Flow Circuit
The water pump is located on the side of the cylinder block. The water pump is gear-driven from the crankshaft.Coolant from the heat exchanger is pulled into the inlet of the water pump by impeller rotation. The coolant exits the pump directly into the engine oil cooler.The coolant that was directed to the cylinder block next flows into the cylinder head.The coolant exits the cylinder head and combines with the flow of coolant from the exhaust manifold and the turbocharger. The combined coolant then flows to the water temperature regulator. The coolant then flows through a deaerator to purge excess air to the expansion tank. The water is then returned to the heat exchanger to be cooled.The coolant recovery bottle adds volume for expansion of the coolant in the engine cooling system. The coolant recovery bottle also provides a convenient way to check the coolant level. Coolant is forced into the bottle during the warmup cycle. Coolant returns to the heat exchanger from the recovery bottle during the cool down cycle.Air vents are provided on the water outlet of the turbocharger. The air vents aid in removing air from the system during the initial filling of the cooling system. The air vents also aid in removing air from the system after a flushing process.Note: