Mercury 350 MAG Manual page 149

6. Pump air into the system until both green indicators extend and water drains from both sides of the engine. The port side will
begin draining before the starboard side.
a
b
Closed Cooled Models
a - Blue drain plug location
b - Blue air pump
c - Air manifold
d - Green indicators
7. Verify that water is draining from each opening. If not, use the Three Point Manual Drain System instructions.
a
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.
90-8M0050539 MAY 2011
eng
c
d
b
a - Green indicators
a
6135
a
6124
Seawater Cooled Models
a -
b -
6133
Section 6 - Storage
c
6125
Port side drain location
Starboard side drain location
b
d
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