Operating In Freezing Temperatures; Operating In Salt Water Or Polluted Water; Operating At High Elevations - Mercury 300 - PRO MAX 3.0L User Manual

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OPERATION
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Operating In Freezing Temperatures

When using your outboard or having your outboard moored in freez-
ing or near freezing temperature, keep the outboard tilted down at
all times so the gear case is submerged. This prevents trapped wa-
ter in gear case from freezing and causing possible damage to the
water pump and other components.
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
the water level inside the outboard drive shaft housing, it will block
water flow to the engine causing possible damage.
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Operating In Salt Water Or Polluted Water

We recommend flushing the internal water passages of your out-
board with fresh water after each use in salt or polluted water to pre-
vent a buildup of deposits from clogging the water passages. Refer
to "Flushing The Cooling System" procedure in the Maintenance
Section.
If you keep your boat moored in the water, always tilt the outboard
so the gear case is completely out of water (except in freezing tem-
perature) when not in use.
Wash down the outboard exterior and flush out the exhaust outlet
of the propeller and gear case with fresh water after each use. Each
month, spray Mercury Precision Corrosion Guard (92-802878-55)
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 perform-
ance loss resulting from reduced oxygen in the air. Consult your
dealer.
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