12. Crank the engine over slightly with the starter motor to purge any water trapped in the seawater pump. Do not allow the
engine to start.
13. After the water has drained from the engine, install the blue plugs on the distribution housing and seawater pump if they
were removed and tighten securely.
14. Push the locking lever down on the air pump and remove the pump from the air actuator assembly. Install the cap on the
fitting.
15. Install the blue plug on the heat exchanger and tighten securely.
16. Mercury MerCruiser recommends the drain system remain open while transporting the boat or while performing other
maintenance. This helps ensure that all water is drained.
17. Before launching the boat, pull up on the manual release valve. Verify that the green indicators are no longer extended.
a - Green indicators
18. Open the seacock, if equipped, or unplug and connect the water inlet hose prior to operating the engine.
Manual Single‑Point Drain System (Alpha Standard Cooling)
The following instructions apply to draining procedures performed on engines in vessels that are in the water. For vessels that
are not in the water, you do not need to close the seacock (if equipped) or remove and plug the water inlet hose.
1. Close the seacock (if equipped) or remove and plug the water inlet hose.
2. Remove the engine front cover by pulling it up.
3. Remove the blue plug from the engine block.
a
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Section 5 - Storage
Page 94 90-8M0128973 eng MAY 2017
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