INSTALLATION MANUAL
Page 62 of 77 90-864198020
8. Verify that water is draining from each opening. If not, use the 3 Point Manual Drain
System instructions.
77844
77839
b
a
a-Port Side Drain Location
b-Starboard Side Drain Location
9. Allow the system to drain for a minimum of 5 minutes. Add air as necessary to keep the
green indicators extended.
10. Crank engine over slightly with starter motor to purge any water trapped in seawater
pump. DO NOT allow engine to start.
11. Reinstall the blue drain plug in the thermostat housing.
12. Remove the 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.
IMPORTANT: Mercury MerCruiser recommends that propylene glycol (a nontoxic
and environmentally safe) antifreeze be used in the seawater section of the cooling
system for cold weather or extended storage. Make sure that the propylene glycol
antifreeze contains a rust inhibitor and is recommended for use in marine engines.
Be certain to follow the propylene glycol manufacturer’s recommendations.
14. Before launching boat, pull up on manual release valve. Verify that green indicators are
no longer extended.
77638
a
a-Green Indicators
15. Open the seacock prior to operating the engine.
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