EXHAUST WATER VALVE
During acceleration, the EMM opens a valve that injects water into the exhaust housing. This water changes the tuning of the exhaust, allowing the engine to develop more midrange horsepower as the boat comes on plane.
If the valve is plugged or not working, the operator may not notice a problem on slow acceleration. On rapid acceleration, the outboard may have difficulty getting the boat on plane.
If the valve is stuck open, the outboard may be low on top speed power (above 4600 RPM).
Static Test
Use the Evinrude Diagnostics Software program to test the water valve solenoid electrical circuit. Monitor the voltage at pin 2 (blue/red wire) of the the water valve connector. Voltage should drop while the static test is active.
Static Tests Screen
- Water valve test button
Dynamic Test
Use the diagnostic program to perform a dynamic test of the water valve while the outboard is running.
Disconnect the water valve outlet hose.
- Water valve outlet hose
Start the outboard. No water should flow from the hose. If water appears, check for debris in valve assembly, or damaged diaphragm.
With the outboard idling, activate the dynamic water valve test and check for water flow. A steady stream of water should flow from the hose while the test is running.
Dynamic Tests Screen
- Water valve test button
Results:
No water flow—check for debris in valve assembly and water supply line. Refer to EXHAUST WATER VALVE TEST on p. 130.
Water appears—make sure fitting into exhaust housing is clear.
