14. Push the locking lever down on the air pump and remove the pump from the air actuator assembly. Install the cap on the
fitting.
15. Install the blue plug on the heat exchanger and tighten securely.
16. The drain system should remain open while transporting the boat or while performing other maintenance. This helps
ensure that all water is drained.
17. Before launching the boat, pull up on the manual release valve. Verify that the green indicators are no longer extended.
a - Green indicators
18. Open the seacock, if equipped, or unplug and connect the water inlet hose prior to operating the engine.
Air Actuated Single‑Point Drain System (Closed Cooling, Inboard Models)
The following instructions apply to draining procedures performed on engines in vessels that are in the water. For vessels that
are not in the water, you do not need to close the seacock (if equipped) or remove and plug the water inlet hose.
1. Close the seacock (if equipped) or remove and plug the water inlet hose.
2. Remove the blue plug from the heat exchanger.
3. Remove the cap from the air actuated valve assembly.
a - Blue plug
b - Cap
4. Ensure that the lever on top of the air pump is flush with the handle (horizontal).
5. Install the air pump on the actuator fitting.
a
6135
Maintenance
Page 1C-42 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015
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