Manual Single-Point Drain System; Boat In The Water - Mercury Mercruiser Tow Sport 5.7 MPI Manual

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 the 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.
Manual Single‑Point Drain System

Boat in the Water

1. Close the seacock (if equipped) or remove and plug the water inlet hose.
2. Rotate the blue handle counterclockwise until it stops (approximately two turns). The red on the handle shaft indicates that
the drain system is open. Do not force the handle as this will create new threads.
90-8M0076545 NOVEMBER 2012
eng
b
a - Green indicators
a
6135
a - Port side drain location
b - Starboard side drain location
6133
Section 6 - Storage
Page 65