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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 |
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GENERAL OFFICES—DETROIT
ROCHESTER PRODUCTS CARBURETOR
BULLETIN |
Page
1
Supersedes Issue |
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Dated
7-11-52 |
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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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