COOLING SYSTEM
Check the condition of cooling system components 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.
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 cooling 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
To prevent injury from contact with rotating propeller, remove the propeller before flushing.
Refer to Propeller Hardware Installation on p. 65.
Place outboard in VERTICAL (DOWN) position in a well ventilated area.
Remove plug and nozzle (overboard indicator) from the flushing port.
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.
Reinstall plug and nozzle. Position the plug and nozzle to allow the water stream to be seen from the helm.
Leave the outboard in VERTICAL (DOWN) position long enough for the powerhead to drain completely.
Reinstall propeller.
Flushing — Outboard Not Running
Outboard can be in VERTICAL (DOWN) or TILTED (UP) position.
Remove plug and nozzle (overboard indicator) from the flushing port.
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.
Reinstall plug and nozzle. Position the plug and nozzle to allow the water stream to be seen from the helm.
Position outboard in VERTICAL position (DOWN) long enough to allow the powerhead to drain completely.
Water Intake Screens
Inspect condition of water intake screens. Clean or replace as needed.
Confirm function of overboard water pressure indicator.
Clean or replace plug and nozzle as needed.
TYPICAL
- Water intake screen
- Overboard water pressure
Additional Maintenance
- Check Engine Monitor function.
- Check operation or visually inspect thermostats and pressure relief valve. Clean or replace as needed.
- Check that all water passages, hoses, and fit tings for both the EMM and the vapor separator flow water freely.
- Replace water pump.
