Three-Point Manual Drain System; Boat In The Water - Mercury Mercruiser Tow Sport 5.7 MPI Manual

3. 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
4. Allow the system to drain for a minimum of five minutes. We recommend leaving the plugs out while transporting the boat
or performing other maintenance to ensure that all water is drained.
5. Close the drain system by rotating the blue handle clockwise until it stops or installing the blue drain plug. The handle is
fully seated when no red is visible. Do not overtighten the handle, as this action will create new threads.
Three‑Point Manual Drain System

Boat in the Water

NOTE: Use this procedure if your engine is not equipped with an air actuated single‑point drain system or if the air actuated
single‑point drain system fails.
1. Close the seacock (if equipped) or remove and plug the water inlet hose.
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
90-8M0076545 NOVEMBER 2012
eng
a - Drain location ‑ orange or red
b - Blue drain plug
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a - Blue drain plug location
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a - Blue drain plug
a
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Section 6 - Storage
Page 67