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ROCHESTER CARBURETORS Bulletin 9D-98 February 15, 1957 |
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PAGE 2 |
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SERVICE
The
following procedure can be used when overhauling or installing replacement
parts.
REMOVAL FROM CARBURETOR
1. Disconnect wire leads which run to control
unit.
2. Remove 3 air horn screws holding retaining
clips for lead
wires.
3. Remove control unit from carburetor by
removing three attaching
screws.
DISASSEMBLY OF UNIT
1. Remove 2 attaching screws which hold
sole-noid to control
housing.
2. Carefully remove solenoid from
housing.
3. Remove control valve by upending unit and
shaking valve into
hand.
4. Make sure small control valve spring is
intact in center of
solenoid.
INSPECTION AND CLEANING
1. Inspect control valve for burrs or
distortion and freedom of
movement in control housing.
2. Inspect control valve spring making sure it
is not
distorted.
3. Visually inspect
bleed holes in housing For being plugged or dirty.
4. Inspect
wiring on solenoid for breaks or shorts.
5. Never immerse the control unit or parts in
any commercial cleaner or
solvent as it will ruin the
vacuum diaphragm or solenoid unit.
6. If cleaning is necessary only clean the
control valve itself to
remove any gum or dirt. |
If
replacement parts are needed a solenoid kit has been released which includes the coil
and lead assembly, control
valve, valve return spring and 2 solenoid retaining screws and lock washers.
The diaphragm and bracket
assembly is also serviced as a
separate unit.
ASSEMBLY OF UNIT
1. Install control valve into
housing.
2. Install small valve return spring into
solenoid assembly.
3. Install solenoid and spring assembly into
control housing lining up solenoid with control
valve.
4. Install two
solenoid retaining screws and lockwashers.
INSTALLATION ON CARBURETOR
1. Attach control unit to carburetor air horn
using three attaching
screws.
2. Attach lead wires.
3. Attach lead wires to carburetor air horn
using three retaining clips,
screws and lockwashers.
ADJUSTMENT
The only
adjustment required is the idle speed adjustment. With the engine running, the
transmission shift lever in neutral and the air conditioning
switch on, turn the adjusting screw on the diaphragm shaft in or out until 900 RPM setting is
reached.
CAUTION: Always
hold the diaphragm shaft with a
wrench to avoid damage to the diaphragm when turning the adjusting
screw. |
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Rochester
Carburetor |
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A GENERAL MOTORS PRODUCT — A UNITED
MOTORS LINE |
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Form 1223 I.P.S. |
Printed in U.S.A. |
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