Mercury Optimax 150 User Manual

4
B
COOLING
90-855347R1 JANUARY 1999 Page 4B-1
POWERHEAD
Section 4B - Cooling
Table of Contents
Specifications 4B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Pressure 4B-1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat 4B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Special Tools 4B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Sensor 4B-3. . . . . . . . . . . . . . . . . . . . . . .
2.5 Liter Optimax/DFI Water Flow 4B-3. . . . . . . . . . . . . .
Description 4B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1998/1999 Water Flow Diagram 4B-5. . . . . . . . . . . . . . . .
1999 1/2 Water Flow Diagram 4B-6. . . . . . . . . . . . . . . . .
Thermostat Test 4B-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water Pressure Check 4B-8. . . . . . . . . . . . . . . . . . . . . . . .
Water Pump Cleaning and Inspection 4B-9. . . . . . . . . . .
Problem Diagnosis 4B-10. . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
Water Pressure
Idle 1.0 – 3.0 PSI
(6.8 – 20.5 kPa)
Poppet Valve Opening 4 – 9 PSI
(27.4 – 61.6 kPa)
W.O.T. 12.0 PSI (82.1 kPa)
Minimum
Thermostat 120°F (48.9°C). . . . . . . . . . .
Temperature Sensor Location
Starboard Cylinder
Head
Horn Activation
Speed Reduction
(3000 RPM)
221°F (105°C)
Compressor
Horn Activation
221°F (105°C)
Temperature Sensor(s)
Between Black and
each TAN/BLK wire.
No
Continuity
Between each lead and
ground
No
Continuity

Mercury Optimax 150 Specifications

General

Horsepower	150 HP
Engine Type	V6
Alternator Output	60 amp / 756 watt
Starting	Electric
Steering	Remote
Displacement	2.5 L
Fuel Induction System	2-Stage Direct Fuel Injection (DFI)
Shaft Length	20", 25"
Dry Weight	431 lbs (20 in), 439 lbs (25 in)