Section 6 - Storage
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4. Visually verify that water is draining. If water does not drain, remove the blue drain plug
from the distribution housing and drain manually.
a
b
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a - Drain location ‑ orange or red b - Blue drain plug
5. Allow  the  system  to  drain  for  a  minimum  of  five  minutes.  Mercury  MerCruiser
recommends  leaving  the  drain  system  open  while  transporting  the  boat  or  while
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 will create new threads.
8. Open the seacock (if equipped) or unplug and reconnect the water inlet hose prior to
operating the engine.
BOAT OUT OF THE WATER
1. Place the boat on a level surface to ensure complete draining of system.
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 overtighten the
handle as this will create new threads.
a
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a - Blue handle