Supplying Cooling Water To The Engine (Boat Out Of The Water); Supplying Cooling Water To The Engine (Boat In The Water); Supplying Cooling Water To The Engine; The Water) - MerCruiser Vazer 100 Owner's Manual

Section 5 - Maintenance
To supply cooling water to the engine, proceed with the following that applies to your
particular power package.

Supplying Cooling Water to the Engine (Boat out of the Water)

NOTE: When operating the engine with the boat out of the water, an external source of
water is needed.
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.
1. Remove the propeller. See Propellers.
2. Place the sterndrive in the full down (in) position.
3. Connect the appropriate attachment to the seawater inlets. See Flushing
Attachments (Running Flush)
Flushing the engine when it is not operating will result in water collecting in the exhaust
system, damaging the engine. Do not supply flush water for more than 15 seconds without
the engine operating.
4. Completely open the water source to supply maximum cooling water to the seawater
inlets.
5. Immediately start the engine.
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.
6. Depress the throttle‑only button and slowly advance the throttle until the engine
reaches 1300 RPM (± 100 RPM).
7. Observe the water temperature gauge to ensure that the engine is operating in the
normal range.
8. After the specified operating time is complete, slowly return the throttle to idle RPM.
9. Stop the engine.
10. Immediately shut off the supply water and remove the attachment.
11. Reinstall the propeller. See Propellers.

Supplying Cooling Water to the Engine (Boat in the Water)

NOTE: When operating the engine with the boat in the water, no external source of water
is needed.
1. Place the sterndrive in the full down (in) position.
2. Ensure that the external water level is above the seawater inlets.
3. Start the engine.
4. Depress the throttle‑only button and slowly advance the throttle until the engine
reaches 1300 RPM (± 100 RPM).
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90-899883275 MARCH 2008