Operating In Salt Water Or Polluted Water; Setting Trim Angle While Running Engine At Idle Speed - Mercury 135 Verado Manual

Operating In Salt Water 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.
Setting Trim Angle While Running Engine at Idle
Speed
The exhaust relief hole on the outboard can become submerged
on some boats if the engine is trimmed full in while running at idle
speed. This may result 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.
a
a - Relief hole submerged (wrong)
b - Relief hole above water line (correct)
OPERATION
b
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