Mercury Zeus 3000 Series, User Manual

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Section 5 - Maintenance
90-866938081 MAY 2009 Page 115
Tube Ref No. Description Where Used Part No.
19
Perfect Seal
Threads of the drain screw for
the return seacock
92-34227 1
15. Install the drain screw on the return seacock. Tighten the screw securely.
b
c
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d
a
a
a - Dual hose clamps
b - Primary cooler
c - Seawater hose
d - Drain screw
NOTICE
Water trapped in the seawater section of the cooling system can cause corrosion or
freeze damage. Drain the seawater section of the cooling system immediately after
operation or before any length of storage in freezing temperatures. If the boat is in the
water, keep the seacock closed until restarting the engine to prevent water from flowing
back into the cooling system. If the boat is not fitted with a seacock, leave the water inlet
hose disconnected and plugged.
16. Place a tag at the helm and in the engine compartment stating that the seacocks are
closed and must be opened after all drain plugs and hoses are installed, prior to starting
the engines.
Checking the Seawater Pickup on the Drive
1. Ensure that the water inlet openings for the seawater pickup are clean and not
obstructed. Carefully remove any obstructions. Do not damage the composite seawater
pickup cover.
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Inlet openings for seawater pickup (cavity not visible in this view)