Mercury MerCruiser MCM 454 Mag MPI, Service Manual

Page: 856 / 1027

6
B
CLOSED COOLED (FRESH WATER) MODELS
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 6B-1
COOLING SYSTEM
Section 6B - Closed Cooled (Fresh Water) Models
Table of Contents
Torque Specifications 6B-2 . . . . . . . . . . . . . . . . . .
Lubricants / Sealants / Adhesives 6B-2 . . . . . . .
Specifications 6B-2 . . . . . . . . . . . . . . . . . . . . . . . . .
Closed Cooling System Capacity 6B-2 . . . . .
Thermostat 6B-2 . . . . . . . . . . . . . . . . . . . . . . . .
Pressure Cap Rating 6B-2 . . . . . . . . . . . . . . . .
Description 6B-3 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintaining Coolant Level 6B-3 . . . . . . . . . . . . . .
Pressure Cap Maintenance 6B-4 . . . . . . . . . . . . .
Seawater Pickup Pump Maintenance 6B-5 . . . .
Heat Exchanger Repair 6B-5 . . . . . . . . . . . . . . . .
Testing Closed Cooling System 6B-5 . . . . . . . . .
Testing Coolant for Alkalinity 6B-5 . . . . . . . . .
Pressure Testing System 6B-6 . . . . . . . . . . . .
Testing for Cylinder Head Gasket
Leak
6B-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing Heat Exchanger 6B-8 . . . . . . . . . . . . .
For Internal Leak 6B-8 . . . . . . . . . . . . . . . . .
For Blockage 6B-8 . . . . . . . . . . . . . . . . . . . .
Testing Pressure Cap 6B-8 . . . . . . . . . . . . . . .
Thermostat 6B-10 . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 6B-10 . . . . . . . . . . . . . . . . . . . . . . . . .
Testing 6B-11 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 6B-12 . . . . . . . . . . . . . . . . . . . . . . . .
Changing Coolant 6B-13 . . . . . . . . . . . . . . . . . . . .
Closed Cooling Section 6B-13 . . . . . . . . . . . . .
Coolant Recommendations 6B-13 . . . . . . . . .
Change Intervals 6B-13 . . . . . . . . . . . . . . . . . .
Draining Instructions 6B-13 . . . . . . . . . . . . . . .
Cleaning System 6B-14 . . . . . . . . . . . . . . . . . . . . .
Closed Cooling Section 6B-14 . . . . . . . . . . . . .
Seawater Section 6B-15 . . . . . . . . . . . . . . . . . .
Filling Closed Cooling Section 6B-16 . . . . . . . . .
Auxiliary Hot Water Heater Installation 6B-18 . .
Heat Exchanger Bracket Hardware 6B-19 . . . . .
Heat Exchanger Hose Connections 6B-20 . . . . .
Closed Cooling System Water Flow
Diagram
6B-21 . . . . . . . . . . . . . . . . . . . . . . . . . . .
MCM / MIE Models 6B-21 . . . . . . . . . . . . . . . .
Draining Diagram
(Coolant Section of System)
6B-22 . . . . . . . . . .
Downloaded from https://needmanual.com/
Index