Monterey Boats 378SE, Owner'S Manual

Page: 41 / 210

41
MONTEREY
BOATS
Propulsion System
Notice:
If the boat is used in salt or badly polluted
water, engines without fresh water cooling
should be flushed after each use. Refer to
the engine owner’s manual for the proper
engine flushing procedure.
Fresh Water Cooling (Optional)
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 engines on your boat.
The engine owner’s manual provides additional
information regarding service and maintenance
of this equipment.
CAUTION
A RUPTURED COOLING OR EXHAUST HOSE CAN CAUSE
SEVERE ENGINE DAMAGE OR ALLOW A LARGE AMOUNT
OF WATER TO FLOW INTO THE BILGE. SHOULD AN ENGINE
INTAKE, EXHAUST OR COOLING HOSE RUPTURE, TURN
THE ENGINE OFF IMMEDIATELY. PROCEED UNDER TOW IF
NECESSARY, TO A SERVICE FACILITY FOR APPROPRIATE
REPAIRS. MAINTAIN A CLOSE VISUAL WATCH ON THE
PROBLEM HOSE AND THE BILGE WATER LEVEL.
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 en-
gines and outdrives 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 propellers that will best suit the normal needs
of your boat will depend somewhat on your ap-
plication and expected average load. Propeller
sizes are identified by a number or code stamped
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.
Please refer to the outdrive owner’s manual for
specific information on propellers and the proper
installation procedure.
Typical Mercruiser Bravo III Propellers
Typical Volvo DP Propellers
3.6 Performance Issues and Propellers
It is extremely important that the boat is propped
to run at or very near the recommended top RPM
with an average load. If the top RPM is above or
below the recommended range, the propellers
must be changed to prevent loss of performance
and possible engine damage.
The engines can be damaged and the warranty
voided if the boat is not propped correctly. Al-
ways consult your Monterey or authorized engine
service dealer when making changes to the pro-
pellers or if the boat does not run near the top
recommended RPM.