Mercury 350 MAG Manual page 137

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.
b
a
a
Closed 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
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.
90-8M0050539 MAY 2011
eng
c
d
33144
c
d
33150
Seawater Cooled Models
b
6133
Section 6 - Storage
a - Port side drain location
b - Starboard side drain location
Page 129