ROCHESTER CARBURETORS

Bulletin 9C-317 15 February 1957

	BULLETIN 9C-317 PAGE 4 OF 4
		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.
	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 ------- BREAKER POINT GAP — .016" SEC. DISCHARGE HOLES LOWER .038 ------- CAM DWELL — 26° -33° MIDDLE .027 ------- UPPER .028 ------- IGNITION TIMING — 4° BTDC AT IDLE SPARK DRILLINGS .052(4) ------- PUMP JET5 .024 ------- IDLE R.P.M.—POWERGLIDE 425 IN DRIVE POWER RESTRICTIONS .035 ------- SYNCHROMESH—450 NEUTRAL CHOKE RESTRICTIONS CHANNEL .098 ------- BY-PASS ------- ------- IDLE TUBE RESTRICTIONS .026 ------- LOWER IDLE BLEED .033 ------- 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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