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PART
7-2-
C4 AUTOMATIC TRANSMISSION
7-39
DISHED OR
FlAT WASHER
1 3
,4
•
O.D.,
1
~2·
I.
D.
%2'
STEEl PlATE
Ya•
X 1
¥a
•,
DRill TO SUIT
~
HEX. HEAD SCREW
ff
%'-24 X
Y2
HEX. NUT %"-24
RUBBER PlUG
1 \12"
DIA. X 2"
lONG
\12"
WElD
TOGETHER
SPACER-
HOLE THRU
B2Q-9438-A
APPROXIMATElY
STANDARD BOlT
\12"-13 X 4\12"
lONG SQUARE
PLUG
CHAIN, 1 0' lONG
VALVE
FIG. 2- Converter Leak Checking Tool
(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
of the flywheel, back of the block
(in as far as possible), and inside
the converter housing (Fig. 1). Run
the engine until fluid leakage is
evident and the probable
source
of
leakage can be determined.
CONVERTER LEAKAGE
CllECK
During the above fluid leakage
checks, if there are indications that
the welds on the torque converter
are leaking, the converter will have
to be removed and the following
check made before the unit is
replaced:
A leak checking tool (Fig. 2),
can be made from standard parts.
1.
Install the plug in the con-
verter (Fig. 3) and expand it by
tightening the wing nut. Attach the
safety chains.
2. Install the air valve in one of
the drain plug holes.
3. Introduce air pressure into the
converter housing. Check the pres-
sure with a tyre gauge and adjust
it to 20 psi.
40 DUROMETER
WElD TOGETHER
SECURElY -MUST
NOT lEAK
STANDARD FIITING-
87971-S
THREAD END
REMOVE HEAD
AND WElD TO
WASHER
D1067-A
~Tire
Pressure Gouge
FIG. 3 - Typical Converter Leak
Checking Tool
4. Place the converter in a tank
of water. Observe the weld areas
for bubbles. If no bubbles are
observed, it may be assumed that
the welds are not leaking.
ENGINE IDLE SPEED CHECK
Check and, if necessary, adjust
the engine idle speed, using the
procedure 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 when the trans-
mission is shifted into gear and will
cause rough transmission engage-
ment.
CONTROl PRESSURE TAKE-Off HOlE
VACUUM UNIT
D1504-A
FIG. 4- Vacuum Diaphragm
and Control Pressure Connecting
Point - C4 Transmission
MANUAL LINKAGE CHECKS
Correct manual linkage
adjust-
ment is necessary
to
position the
manual valve
for
proper fluid
pres-
sure direction
to
the different trans-
mission
components.
Improperly
adjusted manual linkage may
cause
cross-leakage and
subsequent
trans-
mission failure. Refer
to
Linkage
Adjustments for detailed
manual
linkage adjustment
procedures.
CONTROL PRESSURE AND
VACUUM DIAPHRAGM
UNIT CHECK
When the
vacuum
diaphragm unit
(Fig.
4) is
operating properly and
the downshift linkage
is adjusted
properly, all the transmission
shifts
(automatic and kickdown)
should
occur within the road
speed
limits
specified in the Specification Section.
If the automatic
shifts
do not
occur within limits or the
transmis-
sion
slips
during
shift
points,
the
following procedure is
suggested
to
separate engine, transmission, link-
age, and diaphragm unit
or valve
body problems
:
1.
Attach
a
tachometer to
the
engine and a
vacuum
gauge to the
transmission vacuum line
at
the
vacuum unit (Fig. 6).
2. Attach a pressure gauge to the
control pressure outlet
at
the trans-
mission (Fig. 5).
3. Firmly apply the parking brake
and start the engine.
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