Exhaust Pressure Fitting; Operation Test; Cleaning - BRP Evinrude E-Tec Series Service Manual

MAINTENANCE

EXHAUST PRESSURE FITTING

EXHAUST PRESSURE
FITTING
The exhaust pressure fitting is threaded into the
cylinder/crankcase assembly and protrudes into
the inner exhaust.
1
1. Exhaust pressure fitting
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 engine Monitor screen of the Evinrude
Diagnostics Software program 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.
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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.
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2
Engine Monitor Screen
1. Barometric pressure reading
2. Exhaust pressure reading

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.
Wear safety glasses to avoid personal
injury, and set compressed air pressure to
less than 25 psi (172 kPa).
Use compressed air to blow through the fitting.
Limit the air pressure to 25 psi (170 kPa). Confirm
movement of air through fitting.
IMPORTANT:
ment.
Replace exhaust pressure fittings that are
blocked and cannot be decarbonized.
WARNING
Fitting does restrict air move-
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