Setting Trim Angle While Running Engine At Idle Speed; Operating In Shallow Water - Mercury 300 - PRO MAX 3.0L User Manual

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Setting Trim Angle While Running Engine at Idle
Speed
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Submerging the exhaust relief hole (a) on the outboard can hap-
pen on some boats if you trim "full-in" while running at idle speed,
resulting in, exhaust restriction, rough idle, excessive smoke,
and fouled spark plugs. If this condition exists, trim outboard up
until exhaust relief hole is out of the water (b).
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Operating in Shallow Water

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When operating in shallow water, you can tilt the outboard be-
yond the maximum trim range to prevent hitting bottom.
a. Operate the engine at slow speed only. Do Not exceed 1200
RPM with the outboard trimmed beyond the side supports of
the swivel bracket.
b. Tilt outboard up. Make sure all the cooling water intake holes
stay submerged at all times.
OPERATION
b
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