ROCHESTER CARBURETORS

Bulletin 9D-9C  10-12-53

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Bulletin 9 D-9C
DIVISION OF GENERAL MOTORS CORPORATION
Date:         10-12-53
GENERAL OFFICESóDETROIT
ROCHESTER PRODUCTS CARBURETOR BULLETIN
Page                     1
Supersedes Issue
Dated 7-11-52
SUBJECT--THROTTLE RETURN CHECK INSTALLATION LATE 1953 CADILLAC AND OLDSMOBILES EQUIPPED WITH DYNA-FLOW TRANSMISSIONS
As of September 1953 production, both Cadillac and Oldsmobile Divisions will be manufacturing vehicles equipped with a DYNA-FLOW Torque Converter type of transmission instead of the con­ventional Hydra-Matic unit for these vehicles. In view of differing low speed torque loads upon the engine, those cars using the Dyna-Flow transmission will require the use of a Throttle Return Check, the purpose of which is to allow the throttle valves of the carburetor to close slowly during the last few degrees of throttle valve closure in order to prevent engine stalling under heavy traffic driving conditions.
Because of the fact that this Throttle Return Check will be installed as an integral part of the com­plete carburetor assembly, the basic part number of the carburetor will be affected. Following is a revised list of 1953 Cadillac and Oldsmobile carburetor applications.
Cadillac Application - 1953 Vehicles
(a)    Carburetor #7005100 - For all Hydra-Matic equipped cars manufactured prior to
September 1953.
(b)    Carburetor #7006215*- For Dyna-Flow equipped cars manufactured after
September 1st, 1953. This assembly includes (1) 7005100 carburetor, and, (1) 7006214 Throttle Return Check.
Oldsmobile Application - 1953 Vehicles                           
(a)    Carburetor #7005600 - For all Hydra-Matic equipped cars manufactured prior to
September 1953.
(b)    Carburetor #7005700 - For Synchro-Mesh transmission vehicles. This appli-
cation is unaffected and remains the same.
(c)    Carburetor #7006250*- For Dyna-Flow equipped cars manufactured after
September 1st, 1953. This assembly includes (1) 7005600 carburetor, and, {1) 7006214 Throttle Return Check.
*Note - The 7006214 Throttle Return Check is factory installed and adjusted on these assemblies.
- Adjustment of Throttle Return Check -As used on 7006215 Cadillac, and 7006250 Oldsmobile, Dyna-Flow transmission cars
The Throttle Return Check must be properly adjusted in relation to throttle valve position, and, the diaphragm travel must be determined prior to its installation on the carburetor or whenever adjust­ment is necessary. Proper diaphragm travel is extremely important as it determines the time that the throttle lever contacts the return check screw when the throttle valves are closing. Improper adjustment may result in either a too early contact, or none at all. Adjustment is accomplished as follows:
(OVER)
(1843 PD 10-53)                                                                                                 (Printed in U.S.A.)
GO:9, WD, WR, 31, 32:1-9

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