45
MONTEREY
BOATS
Propulsion System
3.4 Engine Cooling System
All marine engines use surface water as a cool-
ing medium. The cooling water enters the sys-
tem through a water intake in the outdrive and
is expelled through the exhaust system. Water
is pumped through the water inlets, circulated
through the engine block or heat exchanger, and
relinquished with the exhaust gases through the
outdrive or thru-hull exhaust system.
The water pump uses a small impeller made of
synthetic rubber. The impeller and water pump
cannot run dry for more than a few seconds.
RUNNING THE ENGINE WITHOUT WATER FLOWING TO THE
WATER PUMP CAN CAUSE SERIOUS DAMAGE TO THE WATER
PUMP IMPELLER OR ENGINE. NEVER RUN THE MOTOR
WITHOUT WATER FLOWING TO THE WATER PUMP.
NOTICE:
If the boat is used in salt or badly polluted
water, engines without fresh water cooling
the engine owner’s manual for the proper
Fresh Water Cooling
(Optional on some engines)
Your boat could be equipped with a fresh water
cooling system. Installation of a “Fresh Water”
or Closed” cooling system that is cooled by a
heat exchanger and the seawater cooling system
provides adequate engine cooling without
exposing the internal engine cooling system to
the harmful effects of surface water. This system
is optional with the gasoline engine on your boat.
The engine owner’s manual provides additional
information regarding service and maintenance
of this equipment.
A RUPTURED COOLING OR EXHAUST HOSE CAN CAUSE
SEVERE ENGINE DAMAGE OR ALLOW A LARGE AMOUNT OF
EXHAUST OR COOLING HOSE RUPTURE, TURN THE ENGINE
OFF IMMEDIATELY. PROCEED UNDER TOW IF NECESSARY, TO
A SERVICE FACILITY FOR APPROPRIATE REPAIRS. MAINTAIN
Typical Mercruiser Bravo III Propellers
Volvo DP Propellers
3.5 Propellers
Outdrives can be equipped with a single propeller
or dual, counter rotating propellers that convert
the engine’s power into thrust, depending on
engine and outdrive selected for your boat. Pro-
pellers come in a variety of styles, diameters and
pitches. Pitch is the theoretical distance traveled
by the propeller in each revolution.
The propeller(s) that will best suit the normal
needs of your boat will depend somewhat on your
application and expected average load. Propeller
on the prop. Always repair or replace a propeller
immediately if it has been damaged. A damaged
and therefore out of balance propeller can cause
vibration that can be felt in the boat and could
damage the outdrive gear assembly.
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