32
ROUTINE SERVICE
COOLING SYSTEM
Tachometer Pulse Setting
Confirm accuracy of tachometer reading.
• Adjust dial on back of tachometer to required
setting (the outboard should not be running).
Water Pump Overboard Indicator
A steady stream of water should flow from the
overboard indicator.
Operating Temperature
An outboard run at idle speed should achieve a
temperature based on the engine’s thermostatic
control. In general, the powerhead temperature
should reach at least 104°F (40°C) after five min-
utes of idling. Check that the powerhead reaches
idle temperature. Refer to SERVICE SPECIFICA-
TIONS on p. 10.
Idle Speed
Make sure the outboard idles within the specified
idle RPM range. 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
Check the condition of cooling system compo-
nents regularly:
• 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 intake screens. Clean
or replace as needed.
Confirm function of overboard water pressure indi-
cator.
Engine Flushing
Flush the outboard with fresh water following each
use in brackish, salt, or polluted water to minimize
the accumulation of scale and silt deposits in cool-
ing system passages.
The outboard can be flushed on the trailer or at
dockside; running or not running.
IMPORTANT: The outboard must be located in
a well ventilated area with appropriate ground
drainage during the flushing procedures.
Keep water inlet pressure between 20 to 40 psi
(140 to 275 kPa).
Outboard Model Tachometer Setting
115–200 HP 6 Pulse or 12 Pole
1. Water pump overboard indicator 008469A
1. Water intake screen
2. Overboard indicator
DSC02220a
008470A
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