MerCruiser Black Scorpion, User Manual

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Section 6 - Storage
90-865253070 JUNE 2007 Page 81
8. Allow the system to drain for a minimum of five minutes. Pump air as necessary to keep
the green indicators extended.
9. Crank the engine over slightly with starter motor to purge any water trapped in the
seawater pump. Do not allow engine to start.
10. Remove the air pump from the air manifold and return it to the mounting bracket.
11. Mercury MerCruiser recommends leaving the drain system open while transporting the
boat or while performing other maintenance. This helps ensure that all water is drained.
12. Before launching the boat, pull up on the manual release valve. Verify that the green
indicators are no longer extended.
a
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a - Green indicators
Manual Single Point Drain System
BOAT IN THE WATER
1. Close the seacock (if equipped) or remove and plug the water inlet hose.
2. Rotate the blue handle counterclockwise until it stops (approximately two turns). The
red on the handle shaft indicates that the drain system is open. Do not force the handle
as this will create new threads.
3. Immediately remove the blue drain plug from the side of the thermostat housing. This
must be removed within 30 seconds to properly vent the cooling system.
a
b
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a - Blue handle b - Blue drain plug location