Manual Single-Point Drain System; Boat In The Water; Boat Out Of The Water - Mercury 350 MAG Manual

Section 6 - Storage
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.
3. Immediately remove the blue drain plug from the side of the thermostat housing. This must be removed within 30 seconds to
properly vent the cooling system.
4. Visually verify that water is draining. If water does not drain, remove the blue drain plug from the distribution housing and
drain manually.
b
a
5. Allow the system to drain for a minimum of five minutes. We recommend leaving the drain system open while transporting
the boat or performing other maintenance.
6. Reinstall the blue drain plug in the thermostat housing.
7. Close the drain system by rotating the blue handle clockwise until it stops and install the blue drain plug, if removed. The
handle is fully seated when no red is visible. Do not overtighten the handle, as this action will create new threads.
8. Open the seacock (if equipped) or unplug and reconnect the water inlet hose before operating the engine.

Boat out of the Water

1. Place the boat on a level surface to ensure complete draining of system.
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Drain location ‑ orange or red
Blue drain plug
a - Blue handle
b - Blue drain plug location
90-8M0050539 MAY 2011
eng