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 TM 5-1940-277-10
TM 1940-10/1
1-14. MK2 W/ SABRE 5.95 LITER ENGINE COOLING SYSTEM
a. Primary Engine Cooling System. The primary engine cooling system is identical for both port and starboard
engines. Coolant flows from the primary water pump through the engine block to the header and through
the exhaust manifold to the thermostat where it is diverted to the keel cooler or to the primary water pump.
The coolant diverted to the keel cooler flows through the keel cooler to the oil cooler and back to the
primary water pump.
(1) Primary Water Pump circulates coolant through the primary cooling system.
(2) Header (Expansion Tank) acts as a reservoir for both primary and secondary engine cooling systems.
The cap is fitted with a relief valve to prevent damage to the system by overpressurization.
cools the exhaust gases from the engine.
(4) Thermostat operates as a heat sensitive valve, diverting coolant either to the keel cooler or to the
primary water pump.
(5) Keel Cooler serves as a heat exchanger where coolant from the primary cooling system is circulated
through the rear keel cooler and is cooled by raw water under the hull.
(6) Oil Cooler serves as a heat exchanger where oil from the engine is circulated through the oil cooler
and is cooled by the coolant.
b.
Secondary Engine Cooling System. The port and starboard engines have their own separate secondary
engine cooling systems. Coolant flows from the secondary water pump to the transmission oil cooler tot he
intercooler, and from the intercooler to the keel cooler. The coolant flows from the keel cooler back to the
secondary water pump, picking up coolant as needed from the header.
(1) Secondary Water Pump circulates the coolant through the secondary engine cooling system.
(2) Transmission Oil Cooler serves as a heat exchanger where fluid from the transmission is circulated
through the transmission oil cooler and is cooled by coolant.
(3) Intercooler serves as a heat exchanger where coolant is used to cool engine intake air that has been
heated by compression in the turbocharger.
(4) Keel Cooler serves as a heat exchanger where coolant from the secondary engine cooling system is
circulated through the front keel cooler and is cooled by the water under the hull.
(5) Header (Expansion Tank) acts as a reservoir for both primary and secondary engine cooling systems.
The cap is fitted with a relief valve to prevent damage to the system by overpressurization.
Change 3
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