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 TM 5-1940-277-20
TM 1940-20/2
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 to the 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 heater.
(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 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 raw 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.
1-13.1 MK2 W/CUMMINS ENGINE COOLING SYSTEM.
a.
Engine Cooling System. The primary engine cooling system is identical for both port and starboard
engines. Coolant flows from the 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 water
pump. The coolant diverted to the keel cooler flows through the keel cooler to the water pump.
(1)
Water Pump - circulates the coolant through the engine cooling system.
(2)
Header (Expansion Tank) -acts as a reservoir for the engine cooling systems. The cap is
fitted with a relief valve to prevent damage to the system by verpressurization.
(3)
Exhaust Manifold - serves as a heat exchanger where coolant flowing through the exhaust
manifold 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 water pump.
(5)
Keel Cooler - serves as a heat exchanger where coolant from the cooling system is
circulated through the rear keel cooler and is cooled by the raw water under the hull.
b.
Raw Water Cooling System. The port and starboard engines have their own separate raw water
cooling systems. Water flows from the jet drive to the transmission oil cooler to the exhaust system
where it is expelled out of the boat.
(1)
The Jet drive- circulates the coolant through the transission oil cooler.
(2)
Transmission Oil Cooler - serves as a heat exchanger where fluid from the transmission is
circulated through the transmission cooler and is cooled by raw water coolant.
Change 2
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