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21 -68
TRANSMISSION-TORQUEFLITE
The approximate adjustment is l6he inches, meas-
ured from the valve body to the inner edge of the ad-
justing nut (Fig.
40).
However, due to manufacturing
tolerances, the adjustment can be varied to obtain
the specified line pressure.
The adjusting screw may be turned with an Allen
wrench. One complete turn of the adjusting screw
changes closed throttle line pressure approxifnately
1 ? h psi. Turning the adjusting screw counter-clock-
wise increases pressure, and clockwise decreases the
pressure.
Throttle Pressure
Throttle pressures cannot be tested accurately;
therefore, the adjustment should be measured if a
malfunction is evident.
(1) Remove the valve body assembly from the
transmission to perform the adjustment. (Refer to
Page
75).
(2)
Loosen the throttle lever stop screw lock nut
and back
off
approximately five turns (Fig.
41).
(3) Insert gauge pin of Tool (2-3763 between the
throttle lever cam and the kickdown valve.
(4)
By pushing in on the tool, compress the kick-
down valve against its spring
so
the throttle valve is
completely bottomed inside the valve body.
(5)
As force is being exerted to compress the
spring, tighten
the throttle lever stop screw finger
tight against the throttle lever tang with the throttle
lever cam touching the tool and the throttle valve bot-
tomed.
NOTE: Be sure the adjustment is made with the
spring fully compressed and the valve bottomed in
the valve body.
(6)
Remove the tool and tighten the stop screw lock
nut securely.
OlTLE LEVER
N K 155
Fig. 41-Throttle
Pressure Adjustment
RONT P U M P
UCTION
). ;
-
'0
TORQUE
Fig. 42-Air
Pressure Tests
AIR PRESSURE TESTS
A
"NO DRIVE"
condition might exist even with
correct fluid pressure, because of inoperative clutches
or
bands. The inoperative units, clutches, bands and
servos can be located through a series of tests by
substituting air pressure for the fluid pressure (Fig.
42).
The front and rear clutches, kickdown servo, and
low-reverse servo may be tested by applying air pres-
sure to their respective passages after the valve body
assembly has been removed. Refer to Page
75.
To
make the air pressure tests, proceed as follows:
CAUTION: Compressed air supply must
be
free
of
all dirt or moisture. Use a pressure of
30
to
100
psi.
Front Clutch
Apply air pressure to the front clutch "apply" pas-
sage and listen for a dull "thud" which indicates that
the front clutch is operating. Hold the air pressure
on for a few seconds and inspect the system for ex-
cessive oil leaks.
Rear Clutch
Apply air pressure to the rear clutch "apply" pas-
sage and listen for a dull "thud" which indicates that
the rear clutch is operating. Also inspect for exces-
sive oil leaks.
NOTE: If a dull "thud" cannot
be
heard in the
clutches, place the finger tips on the clutch housing
and again apply air pressure. Movement of the pis-
ton can be felt as the clutch is applied.
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