Evinrude E-Tec 40 HP, Service Manual

Page: 88 / 426

86
SYSTEM ANALYSIS
EXHAUST WATER VALVE (60–65HP)
EXHAUST WATER VALVE
(60–65HP)
During rapid acceleration, the
EMM
opens a valve
that injects wat er into the exh aust. This water
changes exhaust tuning, b oosting midran ge
horsepower as the boat comes on plane.
If the valve is plugged or not working, the operator
may not notice a problem during slo w accelera-
tion. During rap id acceler ation, the outboard will
be low on power around 3200 rpm, depending on
boat and load.
If the valve is stuck open , the outbo ard may be
low on top speed power (above 4600 RPM).
Exhaust Water Valve Static Test
Use
Evinrude Diagnostics
sof tware to test the
water valve solenoid ele ctrical circuit. The water
valve is a 55 volt co il. 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. V oltage shou ld d rop
while the static test is active.
Exhaust Water Valve
Dynamic Test
Use the diagnostics program t o pe rform a
dynamic test of the water valve while the outboard
is running.
Disconnect the water valve outlet hose.
Start the outboard. No water should flo w from the
hose. If water appears, check f or debris in valve
assembly.
With the outb oard id ling, activate the dyna mic
water va lve test and check for wa ter 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).
Results:
•
No water flo w—check for debris in valve
assembly and wa ter supply line. Re fer to
EXHAUST WATER VALVE TEST
on p. 106.
•
Water appears—make sure fitting into exhaust
housing is clear.
Static Tests Screen
1. Water valve test button
008596
1
1. Water valve outlet hose
004293
Dynamic Tests Screen
1. Water valve test button
008597
1
1