Engine Systems
COOLING SYSTEM
oil cooler housing and into the cylinder block. From
To effectively dissipate the heat generated by the
the cylinder block the coolant passes up through the
engine, one of three different types of cooling systems
is used on a V-71 engine; radiator and fan, heat
cylinder heads and, when the engine is at normal
exchanger and raw water pump, or keel cooling. Each
operating temperature, through the thermostat hous-
system is provided with a centrifugal type water pump
ings and into the upper portion of the radiator. Then
that circulates the engine coolant. Each system
the coolant passes down a series of tubes where the
incorporates thermostats to maintain a normal engine
coolant temperature is lowered by the air stream
operating temperature of 160-185 F (71-85C). A
created by the revolving fan.
typical cooling system is illustrated in Fig. 19.
Upon starting a cold engine or when the coolant is
below operating temperature, the coolant is restricted
Radiator and Fan Cooling
at the thermostat housing and a by-pass provides
water circulation within the engine during the warm-
Coolant is drawn from the lower portion of the
up period.
radiator by the water pump and is forced through the
Fig. 19 - Cooling System
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