Cooling System Flushing - BRP Johnson 4HP Service Manual

PERIODIC MAINTENANCE

COOLING SYSTEM FLUSHING

COOLING SYSTEM FLUSHING
DO NOT run the engine indoors or without adequate ven-
tilation or permit exhaust fumes to accumulate incon-
fined areas. Engine exhaust contains carbon monoxide
which, if inhaled, can cause serious brain damage or
death.
Prevent injury from contact with rotating propeller:
remove the propeller before flushing.
Outboard Running
a
Place the engine in vertical position in a well-ventilated area
with good drainage.
Remove the plug A from the flushing port.
Install flushing device 1 and garden hose.
Cover the water intake hole with tape 2.
Place the shift lever in NEUTRAL with the propeller removed.
Start the water — keep pressure between 20 to 40 psi (140
to 300 kPa).
Start the engine — run it at idle only and flush it for at least 2
five minutes.
Shut OFF the engine, then turn off the water.
Remove the tape and reinstall the flushing port plug.
Leave the outboard in vertical position long enough to com-
pletely drain the powerhead.
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