Exhaust Water Valve Static Test; Exhaust Water Valve Dynamic Test - Evinrude E-TEC E40DRLSCB Service Manual

SYSTEM ANALYSIS
EXHAUST WATER VALVE
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 accelera-
tion. 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 oper-
ates on 12 VDC, will not activate the water valve.
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
1. 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.
116
Disconnect the water valve outlet hose.
1. 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).
1
Dynamic Tests Screen
1. Water valve test button
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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.
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