Three-Point Manual Drain System; Boat In The Water - Mercury 350 MAG Manual

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.
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 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).
90-8M0050539 MAY 2011
eng
a - Blue handle
a
6141
a - Drain location ‑ orange or red
b - Blue drain plug
6137
a - Blue drain plug
a
6138
Section 6 - Storage
Page 143