42
.ROUTINE SERVICE
EXHAUST PRESSURE FITTING
EXHAUST PRESSURE
FITTING
The exh aust pressure fitting is t hreaded into the
adapter housing and protrudes into the inner
exhaust.
A hose is routed from this fitting to t he EMM. Due
to carbon accumulation in the exhaust, this fitting
must be periodically de-carbonized or replaced.
Operation Test
Use the Evinrude Diagnostics sof tware Monitor
screen to confirm:
• barometric pressure reading; and
• changes in exhaust pressure reading.
With key ON, outbo ard NOT runn ing, make sure
the barometric pressure readin g reflect s actu al
atmospheric conditions.
If barometric pressure reading is inaccura te,
remove exhaust/barometric pre ssure hose fro m
EMM. Retest and observe engine Monitor screen.
If b arometric p ressure read ing is accurat e with
hose remo ved, replace hose and diaphrag m
assembly. and inspect ex haust fitting for re stric-
tion.
With key ON, outb oard NOT running, the exhaust
pressure sensor reading should be close to zero.
With the outboard running, make sure the exhaust
pressure reading chang es wit h thrott le settin g.
This reading will vary, based on actu al outboa rd
exhaust pressure conditions.
If the exhaust pressure rea dings are not as
described, clean or replace exhaust pre ssure 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 comp ressed air to blow thro ugh 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 press ure fittings that are
blocked and cannot be decarbonized.
1. Exhaust pressure fitting 005026
Engine Monitor Screen
1. Barometric pressure reading
2. Exhaust pressure reading
008566
A WARNING
Wear safety glasse s to avoid personal
injury, and set compressed air pressure to
less than 25 psi (172 kPa).
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