85
MAINTENANCE
EXHAUST PRESSURE FITTING
3
EXHAUST PRESSURE
FITTING
The exhaust pressure fitting is threaded into the
cylinder/crankcase assembly and protrudes into
the inner exhaust.
A hose is routed from this fitting to the EMM. Due
to carbon accumulation in the exhaust, this fitting
must be periodically de-carbonized or replaced.
Operation Test
Use the Evinrude Diagnostics software Monitor
screen to confirm:
• barometric pressure reading; and
• changes in exhaust pressure reading.
With key ON, outboard NOT running, make sure
the barometric pressure reading reflects actual
atmospheric conditions.
If barometric pressure reading is inaccurate,
remove exhaust/barometric pressure hose from
EMM. Retest and observe engine Monitor screen.
If barometric pressure reading is accurate with
hose removed, replace hose and diaphragm
assembly. and inspect exhaust fitting for restric-
tion.
With key ON, outboard NOT running, the exhaust
pressure sensor reading should be close to zero.
With the outboard running, make sure the exhaust
pressure reading changes with throttle setting.
This reading will vary, based on actual outboard
exhaust pressure conditions.
If the exhaust pressure readings are not as
described, clean or replace exhaust pressure fit-
tings.
Cleaning
Cleaning with Engine Tuner maintenance product
can dissolve carbon build-up.
Spray Engine Tuner through the fitting and allow it
to soak for four to six hours.
Use compressed air to blow through the fitting.
Limit the air pressure to 25 psi (170 kPa). Confirm
movement of air through fitting.
IMPORTANT: Fitting does restrict air move-
ment.
Replace exhaust pressure fittings that are
blocked and cannot be decarbonized.
1. Exhaust pressure fitting 005236
1
Engine Monitor Screen
1. Barometric pressure reading
2. Exhaust pressure reading
006751
WARNING
Wear safety glasses to avoid personal
injury, and set compressed air pressure to
less than 25 psi (172 kPa).
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