Seawater Inlet Specifications; General Cooling System Information; Seawater Inlet Hose - Mercury MerCruiser Service Manual

All Models
Lubricants, Sealants, Adhesives
Tube Ref No.
Perfect Seal
19
Loctite 242 Threadlocker
66
Loctite 609
68
2-4-C with PTFE
95
Special Tools
Air Line Cutter

Seawater Inlet Specifications

Seawater inlet hose

Seawater pickup
Seacock (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.
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.
Page 6A-2
Description
Water circulating pump gaskets and the threads of the attaching
Cuts water drain system air lines without collapsing them.
24887
Seawater Inlet Specifications
32 mm (1‑1/4 in.) I.D. (wire‑reinforced)
Low restriction with 32 mm (1‑1/4 in.) connections
© 2016 Mercury Marine
Where Used
fasteners
Seawater pump cover screw threads
Outer diameter of the lip seal
Bearing shaft next to the rear shaft bearing
91‑883502
NOTICE
92-34227Q02
Obtain Locally
92-802859A 1
90-8M0099748 eng DECEMBER 2015
Part No.
92-809821