TM 5-3825-226-24
COOLING SYSTEM
COOLING SYSTEM WITH STANDARD VERTICAL RADIATOR
1. Radiator cap. 2. Radiator top tank. 3. Radiator top hose. 4. Shunt line. 5. Housing for water temperature
regulators. 6. Coolant to housing for water temperature regulators. 7. Cylinder heads (two). 8. Vent tube. 9. Surge
tank. 10. Inside bypass. 11. Radiator bottom tank. 12. Radiator bottom hose. 13. Water pump. 14. Outlet line for
oil cooler. 15. Oil cooler. 16. Inlet line for oil cooler. 17. Cylinder block. A. Orifices between cylinder heads and front
cover. B. Orifice in oil cooler inlet.
Water pump (13) is installed on the front face of the
front cover for the engine and is driven by V belts from
the crankshaft pulley. The inlet opening of water pump
(13) is connected to radiator bottom hose (12). The
outlet flow of coolant from water pump (13) goes
through inside passages in the front cover for the
engine.
As the coolant goes from the water pump, it divides and
goes through the inside passages in the front cover for
the engine to cylinder block (17). Most of the coolant
goes through cylinder block (17) and up to cylinder
heads (7). From cylinder heads (7) the coolant goes
forward through orifices (A) to the front cover for the
engine.
Part of the coolant going to the left side (as seen from
the flywheel) of cylinder block (17) goes through orifice
(B) to inlet line (16) and on to oil cooler (15), to cool the
oil for lubrication of the engine, and back to the front
cover for the engine through outlet line (14).
From the front cover for the engine, the coolant either
goes to the inlet for water pump (13) or to the radiator.
If the coolant is cold (cool), the water temperature
regulators (18) will be closed. The coolant will go
through inside bypass (10) to water pump (13). If the
coolant is warm, the water temperature regulators (18)
will be open. When the water temperature regulators
(18) are open, they make a restriction in the inside
bypass (10) and the coolant goes through radiator top
hose (3) and into radiator top tank (2). Coolant then
goes through the core of the radiator to the radiator
bottom tank (11) where it is again sent through the cool
FLOW OF COOLANT
3. Radiator top hose. 5. Housing (water temperature
regulators). 6. Coolant to housing for water
temperature regulators. 10. Inside bypass. 18. Water
temperature regulators (two). C. Flow with warm
coolant. D. Flow with cold coolant.
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