Johnson J10RLSUR, Service Manual

Page: 55 / 229

53
MAINTENANCE
COOLING SYSTEM
3
COOLING SYSTEM
Check the condition of cooling system compo-
nents regularly. The outboard cooling system con-
sists of:
•
water intake screens;
•
overboard water pressure indicator;
•
water pump;
•
all internal water passages;
•
thermostats; and
•
all external water hoses and fittings.
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. 47.
Place outboard in VERTICAL (DOWN) position in
a well ventilated area.
Remove the plug from the flushing port on
exhaust manifold.
Install flushing adapter and garden hose.
Remove propeller and shift the outboard to NEU-
TRAL.
Turn water supply on. START outboard. Run out-
board at IDLE only for at least five minutes.
Shut OFF the outboard. Turn off water supply.
Remove garden hose and flushing device. Rein-
stall plug (9.9/15 HP models).
Leave the outboard in VERTICAL (DOWN) posi-
tion long enough for the powerhead to drain com-
pletely.
Reinstall propeller.
WARNING
Prevent injury from contact with rotating
propeller; remove the propeller before
flushing.
DR31699
DR5077