Troubleshooting Silent Choice Exhaust Silencer System - Mercury 305 CID Service Manual

Troubleshooting Silent
Choice Exhaust Silencer
System
g
c
b
d
f
a - Air Cylinder Assembly
b - Air Pump
c - Solenoid
d - Check Valve
e - Relief Valve
f - Air Intake Valve
g - Mode Switch
Index
90-823225--1 1096
NOTE: Perform the following tests with engine(s) not
running.
Compressor will not run
1. Testing mode switch (ignition switch in RUN posi-
a
2. Testing air pump (ignition switch in RUN posi-
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Air pump runs - system inoperative
With air pump running, check hoses, fittings, sole-
noid, and relief valve for air leakage. Replace parts
as needed.
System operates but goes THRU-PROP after air
pump stops running
1. Check that air pressure is not leaking past sole-
2. Check that air pressure is not leaking back
3. Check that air pressure is not leaking at air cylin-
System stays in THRU-TRANSOM mode, will not
go back to THRU-PROP mode
Gray wire, in terminal block, must have battery volt-
age when mode switch is held in THRU-PROP posi-
tion. If not, wiring is faulty. If voltage is present, sole-
noid is faulty.
e
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tion).
a. Purple wire must have battery voltage. If not,
fuse is blown or wiring is faulty.
b. Brown wire must have battery voltage when
mode switch is held in THRU-TRANSOM po-
sition. If not, switch is faulty.
c. Gray wire must have battery voltage when
the mode switch is held in THRU-PROP posi-
tion. If not, switch is faulty.
tion).
a. Check that black wire, in terminal block, is
grounded to engine.
b. Brown wire in terminal block, must have bat-
tery voltage when mode switch is held in
THRU-TRANSOM position. If not, wiring is
faulty. If voltage is present, air pump is faulty.
noid. If so, replace.
through air pump. If so, replace check valve.
der assemblies. If so, replace faulty ones.
TROUBLESHOOTING - 1C-31