If the boat cannot be removed from the water during freezing temperatures, the
outboard should be tilted up so the trailing edge of the antiventilation plate is
protruding slightly above the water surface—refer to the following graphic
illustration. At this tilt angle, the engine’s water pump and cooling water
passages are best protected from freezing up with ice.
Operating in Saltwater or Polluted Water
We recommend that you flush the internal water passages of your outboard
with fresh water after each use in salt or polluted water. This will prevent a
buildup of deposits from clogging the water passages. Refer to Maintenance ‑
Flushing the Cooling System.
If you keep your boat moored in the water, always tilt the outboard so the
gearcase is completely out of water (except in freezing temperatures) when not
in use.
Wash the outboard exterior and flush out the exhaust outlet of the propeller and
gearcase with fresh water after each use. Each month, spray Mercury Precision
or Quicksilver Corrosion Guard on external metal surfaces. Do not spray on
corrosion control anodes as this will reduce the effectiveness of the anodes.
Operating at High Elevations
Your engine automatically compensates for high elevation changes. A different
pitch propeller may help reduce some normal performance loss resulting from
reduced oxygen in the air. Consult your dealer.
Effects of Elevation and Weather on Performance
The following conditions lower engine performance and cannot be
compensated by the engine fuel or electronic management systems:
• Above sea level elevations
• High temperature
• Low barometric pressure
OPERATION
eng 37
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