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 TM 5-1940-277-10
TM 1940-10/1
1-14.1. MK2 W/ Cummins 6BT 5.9 Liter ENGINE COOLING SYSTEM
a. Engine Cooling System. The engine cooling system is identical for both port and starboard engines.
Coolant flows from the water pump through the engine block to the header to the thermostat where it is
diverted to the keel coolers or to the water pump. The coolant diverted to the keel cooler flows through the
keel cooler and back to the water pump.
(1) Water Pump circulates coolant through the primary cooling system.
(2) Header (expansion tank) acts as a reservoir for engine cooling system. The cap is fitted with a
pressure relief valve to prevent damage to the system.
(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 coolers or to the
primary water pump.
(5) Keel Coolers serve as a heat exchanger where coolant from the cooling system is circulated through
the keel coolers and are cooled by raw water under the hull.
b.
Secondary Engine Cooling System. The port and starboard engines have their own separate secondary
engine cooling systems. Water flows from jet drive to the transmission oil cooler to the exhaust pipes
where it is expelled.
(1) Transmission Oil Cooler serves as a heat exchanger where fluid from the transmission is circulated
through the transmission oil cooler and is cooled by raw water.
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Change 3
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