EXHAUST WATER VALVE
During rapid acceleration, the EMM opens a valve that injects water into the exhaust. This water changes exhaust tuning, boosting midrange horsepower as the boat comes on plane.
If the valve is plugged or not working, the operator may not notice a problem during slow acceleration. During rapid acceleration, the outboard will be low on power around 3200 rpm, depending on boat and load.
If the valve is stuck open, the outboard may be low on top speed power (above 4600 RPM).
Exhaust Water Valve Static Test
Use Evinrude Diagnostics software to test the water valve solenoid electrical circuit. The water valve is a 55 volt coil. The static test, which operates on 12 VDC, will not activate the water valve. Monitor the voltage at pin 2 (blue/red wire) of the water valve connector. Voltage should drop while the static test is active.
Static Tests Screen
- Water valve test button
Exhaust Water Valve Dynamic Test
Use the diagnostics 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.
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.
Water should flow at a rate of 18 to 25 ounces / minute (550 to 750cc/minute).
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. 136.
Water appears—make sure fitting into exhaust housing is clear.
