Cooling - Mercury MerCruiser MCM 454 Mag MPI Service Manual

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