Section 6 - Storage
Page 90 90-899883173 DECEMBER 2007
7. Immediately remove the blue drain plug from the side of the thermostat housing or the
heat exchanger. This must be removed within 30 seconds to properly vent the cooling
system.
Closed Cooled Models Seawater Cooled Models
a - Blue drain plug location
b - Blue air pump
c - Air manifold
d - Green indicators
8. Verify that water is draining from each opening. If not, use the Three Point Manual
Drain System instructions.
a - Port side drain location
b - Starboard side drain location
9. Allow the system to drain for a minimum of five minutes. Pump air as necessary to keep
the green indicators extended.
10. Crank the engine over slightly with the starter motor to purge any water trapped in the
seawater pump. Do not allow engine to start.
11. Reinstall the blue drain plug in the thermostat housing or heat exchanger.
12. Remove the blue air pump from the air manifold and return it to the mounting bracket.
13. 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.
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