Owner’s Manual &
Installation Instructions
Revision 6e
Page 24
Engine Cooling System cont’d
Filling the coolant system
To fill the coolant system, begin by removing the pressure cap located on the heat
exchanger at the front of the engine and fill through the filler neck. Once the heat
exchanger is completely filled, wait three minutes while the system continues to settle.
Top off the coolant until the heat exchanger is completely full then re-install the pressure
cap. Fill the remote mounted expansion tank so that the tank is half-full (as indicated by
the sight tube). Check the coolant level in the tank several times following the initial fill as
air pockets and entrapped air will migrate to the tank during the first several heat cycles.
WARNING
Before starting the engine, be certain that the sea water pump has an ample supply
of cooling water either from a hose or by placing the boat in the water with each
water pick-up fully submerged. Also, be sure all other fluids are at the proper level
prior to starting.
Once the engine cooling system is filled, start the engine and observe the water
temperature as the engine warms. The coolant temperature should continue rising until it
reaches 170º F. With the engine idling, the thermostat should control engine temperature
to approximately 170º F at all times.
If the temperature rises beyond 180º F there is most likely air trapped within the system.
Shut down the engine and allow it to cool completely. Repeat the filling procedure as
described above making every effort to get the system completely filled with coolant.
Repeat these procedures until a stable 170º F reading is achieved.
During normal operation, coolant will expand with temperature and flow out into the
recovery tank. The coolant level in the recovery tank should rise slightly when the engine
is at full operating temperature. When the engine cools, coolant will be drawn back into
engine.
Once filled correctly the coolant need only be checked by viewing the level in the
expansion tank. Normal coolant level is maintained by adding coolant to the recovery
tank.
Capacity
See “
Maintenance – Engine Coolant
”.
