ROCHESTER CARBURETORS

Bulletin 9C-317 15 February 1957

BULLETIN 9C-317
PAGE 4 OF 4
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SETTING .015"~TOOL BT-91A
With the choke valve partially closed, there should be a clearance of .015" between the lockout lever and the fast idle cam, to allow free movement of the cam when the secondary throttle valves are closed. To adjust, bend with Tool BT-18 or Tool BT-91A.
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SETTING .235", GAUGE BT-131
Bend the unloader tang with Bending Tool BT-69 as necessary to allow the insertion of the proper gauge between the upper edge of the choke valve and the dividing wall of the air horn, with the throttle valves wide open.
SPECIAL TOOLS SHOWN IN THESE PICTURES
ARE AVAILABLE THROUGH UNITED MOTORS SERVICE DISTRIBUTORS
SETTING ,015"~TOOL BT-91A
With the choke valve fully open and the secondary throttle valves partly open, there should be sufficient clearance between the lockout lever and the fast idle cam to allow free movement of the secondary valve shaft. Adjust with Bending Tool BT-91A to the specification listed below.
QUICK REFERENCE !
SPECIFICATIONS
CARBURETOR No.
7008737
1956 TUNE-UP SPECIFICATIONS
PRIMARY
SECONDARY
SMALL VENTURI
1/4"
1/4"
LARGE VENTURI
1"
1-1/16"
SPARK PLUG GAP — .035
MAIN METERING JETS
.048
.046
IDLE NEEDLE HOLES
.046

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BREAKER POINT GAP — .016"
SEC. DISCHARGE HOLES
LOWER
.038

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CAM DWELL — 26° -33°
MIDDLE
.027

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UPPER
.028

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IGNITION TIMING — 4° BTDC AT IDLE
SPARK DRILLINGS
.052(4)

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PUMP JET5
.024

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IDLE R.P.M.—POWERGLIDE 425 IN DRIVE
POWER RESTRICTIONS
.035

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SYNCHROMESH—450 NEUTRAL
CHOKE RESTRICTIONS
CHANNEL
.098
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BY-PASS

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IDLE TUBE RESTRICTIONS
.026

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LOWER IDLE BLEED
.033

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ADJUSTMENTS
DIMENSION
GAUGE No.
FLOAT LEVEL
1 -5/8"
BT-89
FLOAT DROP
2-1/4"
BT-93 OR SCALE
PUMP ROD
1-1/16"
SCALE
AUTOMATIC CHOKE
1 NOTCH LEAN
CHOKE ROD
.043
BT-131
UNLOADER
.235
BT-131
SECONDARY LOCKOUT
.015
FEELER GAUGE
SECONDARY CONTOUR
.015
FEELER GAUGE
FORM 1227 I.F.S.
PRINTED IN U.S.A.

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