Mercury MerCruiser 5.7 Horizon, User Manual

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Section 6 - Storage
90-899883173 DECEMBER 2007 Page 93
12. Before launching the boat, pull up on the manual release valve. Verify that the green
indicators are no longer extended.
a
6135
a - Green indicators
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).
6138
a
a - Blue drain plug
3. To properly vent the cooling system, remove the blue drain plug from the side of the
thermostat housing within 30 seconds.
a
6139
a - Blue drain plug location