ROCHESTER CARBURETORS

Bulletin 9D-9C  10-12-53

Bulletin 9 D-9C
Date: Page

10-12-53

2

SUBJECT THROTTLE RETURN CHECK INSTALLATION LATE 1953 CADILLAC AND OLDSMOBILES EQUIPPED WITH DYNA-FLOW TRANSMISSIONS - Cont'd.
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Fig. 1
1.- Correct diaphragm travel can be obtained by adjusting the Return Check contact screw, in or out, until the overall, length dimension of the contact screw and plunger is 15/16". (See Figure 1). If the Return Check is already mounted on the carburetor, make sure that the throttle lever is not bearing upon the end of the contact screw as this might possibly depress the diaphragm slightly. When turning the contact screw to arrive at the 15/16" length dimension, the plunger must not be allowed to turn, otherwise the diaphragm may be damaged. The plunger shaft incorporates two opposed "flats" upon which a 5/16" wrench may be placed to prevent turning, while the contact screw is turned with a 3/8" wrench.
2. - When installing the Throttle Return Check on the carburetor the extra length attaching screws (1" long) must be used to insure adequate thread depth. With the mounting bracket securely tightened in place make sure that the head of the contact screw squarely lines up with the throttle lever. To obtain correct alignment, it may be necessary to slightly bend the mounting bracket. Caution - Bend only the bracket, not the Return Check housing.
- 0 -
(1843 PD 10-53)

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