Air Actuated Single Point Drain System; Boat In The Water - MerCruiser 350 MAG MPI Tow Sports Owner's Manual

Section 6 - Storage

Air Actuated Single Point Drain System

Boat in the Water

NOTE: This procedure is written for the air pump that is attached to the engine. However, any air source can be used.
1. Close the seacock (if equipped) or remove and plug the water inlet hose.
2. Remove the air pump from the engine.
3. Ensure that the lever on top of the pump is flush with the handle (horizontal).
4. Install the air pump on the actuator fitting.
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.
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.
a
b
Closed Cooled Models
a - Blue drain plug location
b - Blue air pump
c - Air manifold
d - Green indicators
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e
a
c
d
d
8293
a
6124
Seawater Cooled Models
a - Actuator fitting
b - Green indicators
c - Manual release valve
d - Air pump
e - Lever (locking)
c
d
6125
90-8M0053272 NOVEMBER 2010
b