ROCHESTER CARBURETORS

Bulletin 9C-326 15 December 1957

BULLETIN 9C-326
PAGE 4 OF 4
tmpEC-1.jpg
tmpEC-2.jpg
SETTING: .089" -GAUGE, BT-108
SETTING: .360"-GAUGE, BT-I08
With the throttle valves held wide open, the choke valve should be open just enough to admit the large end of Gauge BT-108, Dimension .360", between the upper edge of the choke valve and the inner air horn wall. To adjust, bent the tang on the throttle lever as shown with Bending Tool BT-69.
Turn the idle screw in until it just contacts the second step of the fast idle cam. With the screw resting on the second step and against the high step, bend the choke lever tang with Tool BT-69 as necessary to admit the small end of the gauge between the upper edge of the choke valve and the air horn wall
QUICK REFERENCE SPECIFICATIONS
CARBURETOR No.
7012133
7012451
7012452
1958 TUNE-UP SPECS.
BORE
1-7/16"
1-7/16"
1-7/16"
SMALL VENTURI
1/8"
1/8"
1/8'
LARGE VENTURI
1-3/32"
1-3/32"
1-3/32"
SPARK PLUG GAP—.035
MAIN METERING JETS
.053
.056
.056
BREAKER POINT GAP—.016
IDLE NEEDLE HOLES
.040
.040
.040
SEC. DISCHARGE
LOWER
.028
.031
.031
CAM DWELL—30°
MIDDLE
.026
.026
.026
IGNITION TIMING—4°BTDC at Idle
HOLES
UPPER
.032
.028
.028
IDLE R.P.M. AUTO. TRANS.—425 R.P.M. "DR" SYNCHROMESH—475 R.P.M. "Neut"
SPARK DRILLINGS
(2).040
(2).040
{2).040
PUMP JETS
.026
.026
.026
POWER RESTRICTIONS
.039
.039
.038
CHOKE RESTRICTIONS
CHANNEL
.089
.089
.089
BY-PASS
.040
.040
.040
IDLE TUBE RESTRICTIONS
.030
.027
.029
ADJUSTMENTS
DIMENSIONS
GAUGE No.
FLOAT LEVEL
1-19/64"
1-19/64"
1-19/64"
BT-144
FLOAT DROP
1-29/32"
1-29/32"
1-29/32"
BT-144
PUMP ROD
57/64"
57/64"
57/64"
BT-144
IDLE VENT
49/64"
49/64"
BT-144
AUTOMATIC CHOKE
INDEX
INDEX
INDEX
CHOKE ROD
.089
.089
.089
BT-108
UNLOADER
.360
.360
.360
BT-108
CARBURETOR TOOLS AND GAUGES AS LISTED ARE AVAILABLE THROUGH UMS DISTRIBUTORS
tmpEC-3.jpg
Rochester Carburetor
A GENERAL MOTORS PRODUCT — A UNITED MOTORS LINE
tmpEC-4.jpg
FORM 1254 I.P.S.
PRINTED IN U.S.A.

< PREVIOUS PAGE      NEXT PAGE >

 

RC INDEX

 

INFORMATION FOR 1960 and Earlier CHEVROLETS

 

WebCounter says that you are visitor number:

Please Report any Broken Links or Pages that do not load properly.  Webmaster

This Information is for Research and the Promotion of the Preservation of Older Chevys

All Names, Trademarks and Logos Belong to their Respective Owners.

 

Web Space Provided by TOCMP