Operating In Freezing Temperatures; Operating In Saltwater Or Polluted Water; Operating At High Elevations - Mercury Racing 500R Operation And Maintenance Manual

OPERATION

Operating in Freezing Temperatures

If there is a chance of ice forming on the water, the outboard should be
removed and drained completely of water. If ice should form at any level inside
the outboard driveshaft housing between the water pump and the powerhead, it
will block cooling water flow to the engine which may cause possible damage.
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.
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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.
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