IMPORTANT: If water does not drain from the seawater pump housing when both green indicators are extended, remove
the blue plugs on the seawater pump housing.
a - Seawater pump housing water drain
b - Blue plugs
10. There are power packages that require specific drain plugs removed because the engine angle is greater than the air
actuated drain system allows for proper draining of the system. Remove the blue plugs shown in the following illustrations.
TowSport closed cooling in-line transmission port side view
TowSport closed cooling in-line transmission starboard side view
11. Allow the system to drain for a minimum of ten minutes. Pump air as necessary to keep the green indicators extended.
12. Crank the engine over slightly with the starter motor to purge any water trapped in the seawater pump. Do not allow the
engine to start.
IMPORTANT: This engine has an automatic start function controlled by the PCM. The start function can be terminated by
turning the key to the OFF position.
13. After the water has drained from the engine, install the blue plugs on the distribution housing and seawater pump if they
were removed and tighten securely.
Maintenance
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 1C-41
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