34
ROUTINE SERVICE
COOLING SYSTEM
Tachometer Pulse Setting
(SystemCheck)
Confirm accuracy of tachometer reading.
• Adjust dial on back of t achometer to required
setting (the outboard should not be running).
Water Pump Overboard Indicator
A steady stre am o f water should flow from the
overboard indicator.
Operating Temperature
An outboard run at id le speed sh ould achieve a
temperature base d on the engine’ s thermost atic
control. In gene ral, the powerhea d temperature
should reach at least 104°F (40°C) after five min-
utes of idling. Check that the powerhea d reaches
idle temperature. Refer to SERVICE SPECIFICA-
TIONS on p. 10.
Idle Speed
Make sure the outboard idles within the specified
idle RPM ra nge. If the outboard is run on a flush-
ing device, the idle speed and quality may not be
representative of actual in water use.
COOLING SYSTEM
Regularly inspect cooling system components for
corrosion, damage, leaks, or restrictions:
• water intake screens
• water pump
• all internal water passages
• thermostats
• all external water hoses and fittings
• vapor separator cooling passages and fittings
• EMM cooling passages and fittings
• overboard water pressure indicator.
Water Intake Screens
Inspect condition of water int ake scre ens. Clean
or replace as needed.
Confirm function of overboard water pressure indi-
cator.
Outboard Model Tachometer Setting
40–90 HP 6 Pulse or 12 Pole
1. Water pump overboard indicator 008469
1. Water intake screen
2. Overboard indicator
001212
008470
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