Lubricants, Sealants, Adhesives
Tube Ref No. Description Where Used Part No.
19
Perfect Seal
Water circulating pump gaskets and the threads of the attaching
fasteners
92-34227Q02
66
Loctite 242 Threadlocker Seawater pump cover screw threads 92-809821
68
Loctite 609 Outer diameter of the lip seal Obtain Locally
95
2-4-C with PTFE Bearing shaft next to the rear shaft bearing 92-802859A 1
Special Tools
Air Line Cutter
91‑883502
24887
Cuts water drain system air lines without collapsing them.
Seawater Inlet Specifications
Seawater Inlet Specifications
Seawater inlet hose 32 mm (1‑1/4 in.) I.D. (wire‑reinforced)
Seawater pickup
Low restriction with 32 mm (1‑1/4 in.) connectionsSeacock (ABYC requirement)
Seawater strainer (optional)
General Cooling System Information
Mercury MerCruiser engines come equipped with either standard cooling or closed cooling. On engines with standard cooling,
the engine is cooled entirely by seawater (the water in which the boat is being operated). Closed‑cooling systems use two
cooling circuits, one of which uses seawater similarly to standard cooing. The second circuit uses a mixture of freshwater and
coolant/antifreeze.
The cooling system must receive a sufficient amount of seawater under all operating conditions. The design and installation of
the seawater supply system is the boat manufacturer's responsibility.
NOTICE
Without sufficient cooling water, the engine, the water pump, and other components will overheat and suffer damage. Provide
a sufficient supply of water to the water inlets during operation.
Seawater Inlet Hose
• Use a 32 mm (1‑1/4 in.) I.D. wire‑reinforced hose that is capable of supporting 10 in. Hg vacuum to prevent the seawater
inlet hose from collapsing from the seawater pump suction.
• The hose should be oil and seawater resistant.
• Use the shortest hose length possible with minimal bends to maximize flow.
• All connections must be secured with hose clamps.
• Fasten the hoses to maintain proper routing and to prevent chafing or contact with other moving parts.
All Models
Page 6A-2 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015
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