Boat Out Of The Water - Mercury 350 MAG Manual

Section 6 - Storage
2. Remove the blue drain plug from the distribution housing (lower front, port side).
3. To properly vent the cooling system, remove the blue drain plug from the side of the thermostat housing within 30 seconds.
a
4. Remove the two blue drain plugs from the seawater pickup pump (front, starboard side).
5. Verify that water is draining from each opening.
6. 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 to ensure that all water is drained.
7. Crank the engine over slightly with starter motor to purge any water trapped in the seawater pickup pump. Do not allow the
engine to start.
8. Before launching the boat or starting the engine, close the drain system by installing the four blue drain plugs.
9. Open the seacock, if equipped, or unplug and reconnect the water inlet hose prior to operating the engine.

Boat out of the Water

NOTE: Use this procedure if your engine is not equipped with an air‑actuated single‑point drain system or if the single‑point drain
system fails.
1. Place the boat on a level surface to ensure complete draining of the system.
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Blue drain plugs
Blue drain plug
90-8M0050539 MAY 2011
eng