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7-12
CONVUTEJ DltAIN
I'I.UG l.fAK
GROUP 7-
AUTOMATIC TRANSMISSION
CONVUTEJ
FIG. 11 - Typical Converter Area Leakage Checks
(c) Leakage by the crankshaft seal
will work back to the flywheel, and
then into the converter housing.
Fluid leakage from other areas,
forward .of the transmission could
cause fluid to be present around the
converter housing due to blow-back
or road draft.
The following procedure should be
used to determ ine the cause of leak-
age before any repairs are
made:
(a) Remove the transmission dip-
stick and note the color of the fluid
.
Original factory fill fluid is dyed red
to aid in determining if leakage is
from the engine or transmission.
Since road draft may cause leaking
valley cover oil to be present on the
transmission,
this
leakage,
if present,
should be eliminated before per-
forming work on the
transmission.
(b)
Remove the converter lower
housing
cover.
Clean off any fluid
from the top and bottom of the con-
verter housing, front of the trans-
mission case, and rear face of the
engine and engine oil
pan.
Clean
the converter area by washing with
suitable non-flammable solvent, and
blow dry with compressed air.
(c) Wash out the converter hous-
ing, the front of the flywheel. The
converter housing may be washed
out using cleaning solvent and a
squirt-type oil can. Blow all washed
areas dry with compressed air.
(d) Start and run the engine until
the transmission reaches its normal
operating temperature. Observe the
back of the block and top of the
converter housing for evidence of
fluid
leakage.
Raise the car on a
hoist and run the engine at fast idle,
then at engine idle, occasionally
shifting to the drive and reverse
ranges to increase pressures within
the transmission. Observe the front
oi the flywheel. back of the block
(in as far as possible), and inside
the converter housing
(Fig.
I).
Run
the engine until fluid leakage is evi-
dent and the probable source of leak-
age can be determined.
ENGINE IDLE SPEED CHECK
Check and, if necessary, adjust the
engine idle speed, using the proce-
dure given in Group 10.
If the idle speed is too low, the
engine will run roughly. An idle
speed that is too high will cause the
car to creep excessively when the
transmission is shifted into gear and
will cause rough transmission en-
gagement.
MANUAL LINKAGE CHECKS
C'..<mect manual linkage adjust-
ment is necessary to position the
manual valve for proper fluid pres-
sure direction to the different trans-
mission components. Improperly ad-
justed manual linkage may cause
cross-linkage and subsequent trans-
mission failure. Refer to Linkage
Adjustments for detailed manual
linkage adjustment procedures.
DOWNSHIFT CABLE CHECKS
Correct downshift cable ad-
justment is essential for normal
service life of transmission and
proper gear shift feel and con-
trol. Refer to the In Car Adjust-
ments Section 3 Page 7-20 for the
detailed adjustment procedures.
INITIAL ENGAGEMENT
CHECKS
Initial engagement checks are made
to determine if initial band and clutch
engagements are smooth.
Run the engine until its normal
operating temperature is reached.
With the engine at the correct idle
speed, shift the selector lever from
N to D, 2, 1 and R. Observe the
initial band and clutch engagements.
Band and clutch engagements should
be smooth in all positions. Rough
initial engagements in D, 2, 1 or R
are caused by high engine idle speed
or high control pressures.
TRANSMISSION OPERATION
CHECKS
TEST PREPARATION
1. Attach a tachometer to the
engine.
2. Attach a pressure gauge to the
control pressure outlet at the trans-
mission (Fig. 12).
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