MerCruiser 496 MAG Owner's Manual page 109

5. Pull lever on air pump (vertical) to lock pump on the fitting.
c
b
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
7. Verify that water is draining from each opening. If not, use the 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. For DTS engines, pull the lanyard stop switch (if equipped), or disable the ignition circuit by pulling the fuse marked "CD".
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. Remove the air pump from the air manifold and return it to the mounting bracket.
12. 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.
90-899883274 MARCH 2008
e
a
b
a -
b -
b
17254
d
8293
c
8294
Port side drain location
Starboard side drain location
Section 6 - Storage
a - Actuator fitting
b - Green indicators
c - Manual release valve
d - Air pump
e - Lever (locking)
a - Actuator fitting
b - Green indicators
c - Manual release valve
Page 101