Evinrude E-tec 75 HP, Service Manual

Page: 74 / 344

74
MAINTENANCE
COOLING SYSTEM
COOLING SYSTEM
Check the condition of cooling system compo-
nents regularly. The outboard cooling system con-
sists of:
•
water intake screens;
•
water pump;
•
all internal water passages;
•
thermostat;
•
all external water hoses and fittings;
•
vapor separator cooling passages and fittings;
•
EMM
cooling passages and fittings;
•
overboard water pressure indicator.
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).
Flushing — Outboard Running
Refer to Propeller Hardware Installation on
p. 65.
Place outboard in VERTICAL (DOWN) position in
a well ventilated area.
Thread garden hose into flushing port.
Shift the outboard to NEUTRAL with the propeller
removed.
Turn water supply on.
START outboard. Run it at IDLE only.
Shut OFF the outboard. Turn off water supply and
remove garden hose.
Leave the outboard in VERTICAL (DOWN) posi-
tion long enough for the powerhead to drain com-
pletely.
Reinstall propeller.
Flushing — Outboard Not Running
Outboard can be in VERTICAL (DOWN) or
TILTED (UP) position.
Thread garden hose into flushing port.
Turn water supply ON.
Flush outboard for at least five minutes.
Turn off water supply and remove garden hose.
Position outboard in VERTICAL position (DOWN)
long enough to allow the powerhead to drain com-
pletely.
WARNING
Prevent injury from contact with rotating
propeller; remove the propeller before
flushing.
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