37
8
06008
A
9
06009
A
Cooling System (Function Description)
STEYR MOTORS Marine Engines are equipped with a closed (internal) and an open (external cooling circuit).
8
Closed Cooling Circuit
The closed cooling circuit includes monoblock as well as exhaust
manifold, heat exchanger and expansion tank. Temperature in the
closed cooling circuit is precisely controlled by means of thermo-
stat. The thermostat determines the amount of coolant circulating
through the heat exchanger, thus controlling the operating tem-
perature of the engine.
A temperature sensor (8/A) controls the cooling temperature. An
excessive temperature rise of the coolant will cause an optical
and audible alarm (see chart “Error indication on Panel Section”).
In this case, engine power will be reduced.
The temperature gauge on the instrument panel indicates the
coolant temperature of the engine.
9
Open Cooling Circuit (Raw Water Circuit)
Thermal energy transfered by the engine and absorbed by the
engine coolant is drained via the (external) raw water circuit. Raw
water is sucked by the pump via the raw water intake, constantly
pumped through supercharger intercooler and heat exchanger,
and discharged together with the exhaust gas via the sprinkler.
During discharching, the raw water entering the exhaust pipe adi-
tionally cools the exhaust gas.
A temperature sensor (9/A) monitors the raw water- and exhaust
gas temperature. An excessive rise will cause an optical and au-
dible alarm (see chart “Error indication on Panel Section”). In this
case, the engine power will be reduced too.
NOTE: Should engine overheat at high speeds, slowly reduce RPM to idling to prevent damages to
the engine. In case of overheating problems, contact your STEYR MOTORS Marine dealer.
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