Mercury MerCruiser MIE 454 Mag MPI Horizon - Cooling System; Cooling

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. . . . . . . . . .
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