Boat Out Of The Water - Mercury Mercruiser Tow Sport 5.7 MPI Manual

Section 6 - Storage
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 the 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 action will create new threads.
Page 66
a
a -
b -
6137
a - Blue handle
a
6141
b
6136
Drain location ‑ orange or red
Blue drain plug
a - Blue handle
b - Blue drain plug location
90-8M0076545 NOVEMBER 2012
eng