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 TM 55-1905-222-14
1-14
ENGINE COOLING SYSTENI.
Identical engine cooling systems are installed,. port and. starboard. The engine cooling system uses fresh water
for cooling the engine block. Coolant is circulated through the engine by a centrifugal type water pump. Heat is removed
from the coolant by the keel coolers. The two keel coolers act as heat exchangers, utilizing the surrounding sea water to
dissipate the heat of the engine coolant. Port and starboard keel coolers are longitudinally recessed in the underside of
the hull between frames 25 and 31. The keel coolers employ a fin design to provide maximum surface area for heat
transfer. Access to the keel cooler Installations and piping is in the buoyancy holds 6 and 7 Upon leaving the keel
coolers, the coolant passes through a swing check valve in the engine room and Into the suction of the engine-driven
water pump. The coolant is then pumped through the cooling passages in the engine. Control of the engine temperature
is accomplished by thermostats that regulate the flow of the coolant within the cooling system. The expansion tanks,
located In the upper reaches of the engine room, accommodate excess coolant and resupply the system when needed
(STARBOARD SYSTEM SHOWN)
1-19
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