B&M 40263 SHIFT IMPROVER KIT - Manual (Page 9)

Three different types of Throttle Valve (TV) linkages
have been used on the Ford AOD transmission since its
introduction. The earliest linkage consisted of a bent rigid rod
connecting the carburetor and transmission while most late
model AOD’s use one of two different flexible cable type
linkages. NOTE: Special tools and a pressure gage will be
required depending on the particular TV linkage type you are
working on. Adjustment procedure for each of the TV linkage
types are presented in the following sections.
1. Carburetor adjustment
Perform the following steps prior to adjusting TV linkage.
1.1Check/adjust the engine curb idle speed to specification.
Refer to the Engine/Emissions Diagnosis manual for
procedures to adjust throttle solenoid applications. Make
sure the curb idle speed is set to specification with and
without the throttle solenoid positioner (anti-dieseling
solenoid) energized, if so equipped.
1.2Shut engine off. Remove air cleaner.
1.3De-cam the fast idle cam on the carburetor so that the
throttle lever is against the idle stop or throttle solenoid
positioner stop.
Rod type TV control system.
The TV control linkage system consists of a linkage lever
on the carburetor, the TV control rod assembly and an
external TV control lever on the transmission. (See Fig. 9.)
The TV control rod transmits motion between the carburetor
linkage lever and the TV control lever on the transmission.
The carburetor linkage lever has an adjustment screw for
limited TV linkage Adjustment. The external TV control lever
actuates the internal TV control mechanism which regulates
TV control pressure.
The TV control rod is set to its proper length during initial
assembly using the sliding trunnion block at the transmission
end of the TV control rod assembly. Under normal circum-
stances it should not be necessary to alter this Adjustment.
Any required adjustment can normally be made using the
adjustment screw on the carburetor linkage lever.
When the linkage is correctly adjusted, the TV control
lever on the transmission will be at its internal stop position
when the carburetor lever is at its minimum idle stop. There
will be light contact force between the throttle lever and the
end of the linkage lever adjustment screw. Due to the
flexibility in the TV linkage the adjustment screw would have
to be backed out several turns before a gap between the
screw and throttle lever could be detected.
Before any engine TV linkage adjustment can be done,
the throttle lever at the carburetor (or throttle body) must be
positioned at its minimum idle stop.
2. Linkage Adjustment at Carburetor
Adjust the TV control linkage at the carburetor using the
following procedure (See Fig. 9.):
2.1Set carburetor at minimum idle stop as described in steps
1 thru 3. Place shift lever in NEUTRAL and set parking
brake. CAUTION: The transmission selector lever must
be in NEUTRAL in when adjusting the TV linkage.
9
TV LINKAGE ADJUSTMENT
2.2Back (turn CCW) the linkage lever adjusting screw all the
way out (until screw end is flush with lever face).
2.3Turn the adjusting screw in (CW) until a thin shim of
.127mm (0.005 inch) maximum, or piece of writing paper
fits snug between end of screw and throttle lever. NOTE:
To eliminate effect of friction, push linkage lever forward
(tending to close gap) and release before checking
clearance between end of screw and throttle lever. Do not
apply any load on levers with tools or hands while
checking gap.
2.4Turn the adjusting screw in (CW) an additional three
turns. (Three turns are preferred. One turn minimum is
permissible if screw travel is limited).
2.5 If it is not possible to turn in adjusting screw at least one
additional turn (from initial gap) or if there was insufficient
screw adjusting capacity to obtain an initial gap in Step 5,
refer to Linkage Adjustment at Transmission.
Idle Speed Adjustment
Whenever it is required to adjust idle speed by more than 50
rpm, the adjustment screw on the linkage lever at the
carburetor should also be readjusted as follows:
Idle Speed Change
Linkage Adjustment
at Carburetor
50 rpm or more Check TV lever adjustment
decrease at carburetor
Less than 50 rpm No change required
50 rpm or more Check TV lever adjustment
increase at carburetor
After making any idle speed adjustments, always verify that
the linkage lever and throttle lever are in contact with the
throttle lever at its idle stop (or throttle solenoid positioner)
and the shift lever is in NEUTRAL.
3. Rod Linkage Adjustment at Transmission
The linkage lever adjustment screw has limited adjust-
ment capability. (See Fig. 9.) If it is not possible to adjust the
TV linkage using this screw, the length of the TV control rod
assembly must be readjusted using the following procedure.
This procedure must also be followed whenever a new TV
control rod assembly is installed.
Figure 9