ROCHESTER CARBURETORS
Bulletin 9C-330 15 December 1957
|
|
|||||
 |
Rochester Carburetors
MODEL 4GC
1957-58 CHEVROLET "V-8" POWER PACK
ADJUSTMENTS AND
SPECIFICATIONS
|
BULLETIN 9C-330
PAGE 3 OF 4 DATE: 12/15/57
|
|||
|
|
|||||
 |
 |
||||
|
SETTING 1-1/16", GAUGE BT-145 OR
SCALE
Back out idle screw until throttle valves
are completely closed. Place combination "pump" and "vent" gauge on
top of air next to pump plunger, as shown. With the throttle valves
closed and lower edge of gauge resting on top of air horn, the pump
plunger shaft should slide freely into hole of gauge marked "pump"
Bend the pump rod with Bending Tool BT-18
as shown to adjust.
|
|||||
|
1957
SETTING 1-5/8" (PRIM. and SEC), GAUGE BT-89
1958
SETTING 1-5/8" (PRIMARY), GAUGE BT-89 SETTING 1-11/16"
(SECONDARY), GAUGE BT-143
With the air horn gasket in place,
position the gauge over the floats and against the curvature in the
air horn bore. Bend the float arms at the rear of the assembly so
floats just touch the gauge. Then bend float arms horizontally to
center each pontoon between the gauge legs.
Note: 1958 secondary float setting
differs from primary. Use gauges and dimensions listed above.
|
|||||
 |
|||||
 |
|||||
|
SETTING
31/32", GAUGE BT-145 OR SCALE
Note: Make pump rod adjustment before
adjusting idle vent
valve.
Place combination "pump" and "vent" gauge
on top of air
horn with side marked "vent" next to pump
plunger shaft,
as shown.
Open throttle valves to point where the
vent valve is just closed. With the throttle valves held in this
position, the hole marked "vent" on the gauge should slide freely over
pump plunger shaft.
Bend the tang on the
pump lever, as shown to adjust.
|
|||||
|
SETTING 2-1/4", GAUGE BT-93
OR SCALE
Bend the float tang as required to obtain
a distance of 2-1/4" from the gasket surface to the bottom of the
float, with the float hanging free.
|
|||||
|
|
|||||
|
1957
SETTING, 1 NOTCH LEAN
1958
SETTING, 1 NOTCH LEAN (POWERGLIDE),
INDEX
(TURBOGLIDE)
Loosen the three retaining screws and
rotate the choke cover
counterclockwise against coil tension until the index
mark
is in the proper position with the index
point on the
choke housing.
|
 |
SET MARK ON COVER
TO SPECIFIED POINT
ON CHOKE HOUSING
|
|||
|
|
|||||
|
FORM NO. 1258 l.P.S. PRINTED IN U.S.A..
|
|||||
|
|
|||||
