Section 5 - Maintenance
90-899883179 OCTOBER 2007 Page 75
NOTICE
Flushing the engine with the boat in the water can cause seawater to flow into the engine,
resulting in engine damage. Close the seacock before flushing the engine. Keep the
seacock closed until starting the engine.
1. On seawater cooled models: Proceed to Step 5. or Step 6.
NOTE: Closed cooled models are equipped with a heat exchanger on the front of the
engine.
2.
On Alpha closed cooled models with the sterndrive seawater inlet blocked:
Flushing water will need to be supplied to the sterndrive unit and to the engine. Refer
to Alternative Water Pickups.
3.
On Bravo closed cooled models using the sterndrive seawater inlet and a
through the hull or through the transom alternative water pickup: Flushing water
will need to be supplied to only the sterndrive unit by taking the following steps to block,
or disconnect and block, the hose from the alternative seawater pickup pump inlet
Y‑fitting.
a. If equipped with a seacock, close the seacock in the hose from the alternative
water pickup.
b. If not equipped with a seacock, disconnect the hose from the alternative water
pickup and plug both ends.
c. If there is not a hose running to the transom, refer to Alternative Water
Pickups.
4. If flushing the cooling system with the boat in the water:
a. Raise sterndrive unit to trailer position.
b. Install the appropriate flushing attachment over the water inlet holes in the gear
housing.
c. Lower sterndrive unit to full down/in position.
5. If flushing the cooling system with the boat out of the water:
a. Lower sterndrive unit to full down/in position.
!
WARNING
Rotating propellers can cause serious injury or death. Never operate the boat out of the
water with a propeller installed. Before installing or removing a propeller, place the drive
unit in neutral and engage the lanyard stop switch to prevent the engine from starting.
Place a block of wood between the propeller blade and the anti‑ventilation plate.
b. Remove propeller.
c. Install the appropriate flushing attachment over the water inlet holes in the gear
housing.
6. Connect hose between flushing attachment and water source.
7. With sterndrive unit in normal operating position, open the water source fully.
8. Place the remote control in the neutral idle speed position and start engine.
NOTICE
Operating the engine out of the water at high speeds creates suction, which can collapse
the water supply hose and overheat the engine. Do not operate the engine above 1400
RPM out of the water and without sufficient cooling water supply.
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