Mercury MERCRUISER - Cooling System

Cooling System
Section 6A - All Models
Table of Contents
Seawater Inlet Specifications.............................................6A-2
General Cooling System Information................................. 6A-2
Seawater Inlet Hose................................................... 6A-2
Seawater Pump Output Test...................................... 6A-3
Water Heater Installation................................................... 6A-3
Supply Hose Connection............................................ 6A-4
Return Hose Connection............................................ 6A-4
Seawater Pump (If Equipped)............................................6A-5
Seawater Pump—Exploded View...............................6A-5
Seawater Pump Replacement.................................... 6A-5
Seawater Pump Disassembly.....................................6A-6
Cleaning and Inspection............................................. 6A-7
Seawater Pump Assembly..........................................6A-7
Water Circulating Pump..................................................... 6A-9
Removal......................................................................6A-9
Cleaning and Inspection........................................... 6A-10
Installation.................................................................6A-10
Air‑Actuated Drain System...............................................6A-11
Air Manifold and Air Pump—Exploded View.............6A-11
General Information.................................................. 6A-11
Testing...................................................................... 6A-11
Air Manifold...............................................................6A-12
Drain Check Valve........................................................... 6A-12
General Information.................................................. 6A-12
Exploded View.......................................................... 6A-13
Inspection and Cleaning........................................... 6A-13
Poppet Valve....................................................................6A-14
Poppet Valve Assembly—Exploded View................ 6A-14
Poppet Valve Operation............................................6A-14
Poppet Valve Replacement...................................... 6A-15
Water Distribution Housing.............................................. 6A-16
Removal....................................................................6A-16
Cleaning and Inspection........................................... 6A-16
Water Distribution Housing Installation.....................6A-16
All Models
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 6A-1
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