TM 5-2410-240-23-1
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ENGINE SYSTEMS CONTINUED
Cooling System Continued
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2. The water pump (Figure 14, Item 9) is installed on the front of the timing case (Figure 14, Item 6). The fuel
injection pump gear drives the gear on the back of water pump to run the pump. During engine operation,
coolant flows from the bottom of the radiator (Figure 14, Item 1) to the water pump. The water pump forces
coolant through a passage (Figure 14, Item 7) in the timing case (Figure 14, Item 6). Some of the coolant
enters a passage in the front left side of the cylinder block (Figure 14, Item 5), while some of the coolant
passes over the engine oil cooler element (Figure 14, Item 8) and then enters a passage in the cylinder block.
The coolant then flows around the outside of the cylinders and into the cylinder head (Figure 14, Item 4). The
coolant flows forward through the cylinder head and then flows into the water temperature regulator housing
(Figure 14, Item 2). When the engine coolant is cold, the water temperature regulator is closed. In this case,
coolant flows directly through the bypass (Figure 14, Item 3) to the inlet side of the water pump, where the
process repeats. When the engine coolant is warm, the water temperature regulator is open, and the bypass is
closed. In this case, coolant flows to the top of the radiator, where the process repeats.
Figure 14. Cooling System Operation.
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