Mercury MerCruiser 5.7 Horizon, User Manual

Page: 102 / 114

Section 6 - Storage
Page 94 90-899883173 DECEMBER 2007
4. Remove the two blue drain plugs from the seawater pickup pump (front, starboard side).
a
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a - Blue drain plugs
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.
2. Remove three blue drain plugs: one from the distribution housing (lower front, port side)
and two from the seawater pickup pump (front, starboard side).
a
a
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a - Blue drain plug
3. Verify that water is draining from each opening.
4. 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.
5. 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.
6. Before launching the boat or starting the engine, close the drain system by installing
the three blue drain plugs.