OPEL GT-R 1973 Service Manual

7C-1001973 OPEL SERVICE MANUALFigure 7C-1 12
Figure
7C-1 136. Remove the two check balls located in the oil
passages in the transmission case. See Figure
7C-114.Location of these check balls must be noted so that
they are installed correctly.
Removal of Servo PistonThis operation can be performed with transmission
in vehicle
1. Compress servo piston using servo piston com-
pressor tool J-23075.
Figure7C-1 14
2.Using pliers,
remove servo pistonsnap ring.SeeFigure
X-1 15.
Figure
7C-1 153. Loosen servo piston compressor tool J-23075
slowly as servo is under high spring tension. Remove
tool and servo piston assembly. See Figure
7C-116.
Removal of Selector Lever and ShaftNote at this point that the selector lever (on GT
models only) is on the opposite side from all other
models, and that the selector shaft passes through
the case. See Figures 7C-117 and 7C-118. Note also

AUTOMATIC TRANSMISSION 7C-101
Figure 7C-1 16
-117Figure
7C-118 GT Models
Figure 7C-1 17 GT Modelsthat one case services both models and is machined
to accept selector lever on either side with the unused
hole being plugged.
1. Remove retaining ring From parking actuator rod
to selector inner lever. See Figure 7C-119.
2. Remove selector inner lever locking nut from se-
lector lever shaft.
3. Remove selector inner lever from selector lever
shaft.4. Remove selector lever shaft spring pin by pulling
upwards with small pliers.Figure
7C-1195. Remove selector lever shaft. See Figure 7C-120.
6. Remove selector lever shaft oil seal and discard.
Removal of Modulator Assembly
This operation can be performed with transmission
in vehicle using tool J-23
100.1. Remove vacuum modulator From transmission
case. See Figure
7C-94. Care should be taken not to
lose the modulator plunger.

7C-1021973 OPEL SERVICE MANUAL
Figure 7C-120Figure 7C-122
Figure 7C-12 1
2. Remove modulator valve and sleeve from trans-
mission case.
Removal of Detent Valve Assembly
This operation can be performed with transmission
in vehicle
1. Remove spring pin by pulling upward with pliers.
2. Lightly tap detent valve assembly from front of
case and remove detent valve, sleeve, spring, and
spring seat from rear of easel See Figure 7C-122,Removal of Extension Housing
This operation can be performed with transmission
in vehicle
1. Remove bolt holding speedometer driven gear
housing retainer and carefully remove retainer and
pull speedometer driven gear assembly from exten-
sion housing. See Figure
7C-123.Figure
7C- 123
2. Remove the seven attaching bolts from extension
housing to case.

AUTOMATIC TRANSMISSION 712-1033. Remove extension housing and gasket. See Figure7C- 124.
Figure 7C-124
4. Remove parking
paw1 actuator rod from transmis-
sion case.
Removal of Speedometer Drive Gear, Governor
Body and Governor Hub
1. Depress speedometer drive gear retaining clip and
remove speedometer drive gear by sliding off output
shaft. See Figure
7C-125.
7c-125Figure 7C-125
2. Remove the four (4) attaching bolts from the gov-
ernor body and remove governor and gasket. See
Figure
7C-126.Figure 7C-126
3. Remove governor hub snap ring from output shaft
using snap ring pliers, such as J-8059. See Figure 7C-
128.Figure 7C-128
4. Slide governor hub off the output shaft
Removal of Converter Housing, Oil Pump, Reverse
and Second Clutch Assembly
1. Turn transmission in holding fixture so that con-
verter housing is facing up.
2. Remove the seven converter housing attaching

7C-1041973 OPEL SERVICE MANUAL
bolts which are the outer bolts in the housing. See
Figure 7C-129.
Figure 7C-129
3. Remove converter housing with oil pump, reverseand second clutch assemblies. Do not lose selective
thrust washer. See Figure
7C-130. Second clutch as-
sembly may remain in case. If so, remove with re-
verse clutch plates.
Figure 7C-130
4. Remove reverse clutch plates from transmission
case, See Figure
7C-131.
T%RSE~L~~T~H PLATES
7c-131
Figure
7C-13 I
Removal of Third Clutch Assembly. Planetary
Carrier Assembly, Reaction Sun Gear and Drum
Assembly and Low Band1. Remove third clutch assembly. See Figure 7C-
132.
Figure 7C-132
2. Remove planetary carrier and output shaft by slid-
ing out through front of case. See Figure
7C-133.Care should be taken not to lose the needle thrust
bearing and race in the planetary carrier assembly.
3. Remove reaction sun gear and drum with needle

AUTOMATIC TRANSMISSION 7C-105
Figure 7C-133thrust bearing and race from case by pulling straight
out. See Figure
7C-134.Figure
7C-135Figure
7C-1344. Remove needle thrust bearing and race from rear
of case. See Figure
7C-135.5. Remove low band by slightly compressing band
and pulling straight out. See Figure
7C-137.6. If necessary to remove case vent, install new case
vent. Do not attempt to reinstall old vent.
Disassembly, Inspection and Reassembly of
Converter Housing, Oil Pump and Reverse Clutch1. Remove second clutch assembly from oil pump
shaft. See Figure
7C-138.

7C-1061973 OPEL SERVICE MANUAL
Figure 7C-138
!LREVERSEZH
)N
OIL PUMP
t7c-1382. Remove selective washer from oil pump shaft. See
Figure
7C-138.3. Remove the oil pump outer oil seal and discard.
See Figure
7C-139.Figure 7’2.139
4. Remove the five bolts holding the converter hous-
ing to the oil pump.
5. Remove the converter housing. See Figure 7C-
140.6. Remove oil pump wear plate “A”. See Figure 7C-
140.Figure
7C-1407. Inspect front face of converter housing for oil leak.
See Figure
7C-141. If problem is diagnosed as a front
seal leak (presence of red oil coming from bottom of
converter housing), remove front oil seal.
7c141Figure
7C-1418. Inspect converter housing bushing. If worn,
remove bushing using tool J-21465-17 with drive
handle J-8092 from converter side of housing.
9. Clean converter housing thoroughly. Install con-
verter housing bushing flush with front face of hous-
ing using tool J-21465-17 with driver handle J- 8092.
See Figure
7C-142.

J-8092
CONVERTERFigure 7C-142
10. Install new converter housing oil seal using tool
J-21359. See Figure
7C-143.12. Mark relative location of oil pump gears and
remove oil pump gears. See Figure
7C-144.AUTOMATIC TRANSMISSION
712.107Figure 7C-144
13. Using compressor tool J-2590-12 with adapter
J-21420-1 on reverse clutch retaining seat, compress
clutch return springs. See Figure
7C-146.14. Remove snap ring using snap ring pliers such as
J- 8059. See Figure
7C-146.Figure 7C-143
Figure 7C-146
11. Check converter pump hub for nicks, burrs or
damage which could have caused oil seal to leak or
have worn bushing. Remove nicks and burrs.15. Loosen compressor tool J-2590-12 and remove
reverse clutch retaining ring and 24 reverse clutch
springs.

712.1081973 OPEL SERVICE MANUALCHSJ
351. RETAINING PIN
72. PRESSURE REGULATOR BOOST VALVE SLEEVE
3. PRESSURE REGVLATOR BOOST VALVE
4. PRESSURE REGULATOR VALVE SPRING SEAT
5. PRESSURE REGULATOR VALVE SPRING
6. PRESSURE REGULATOR VALVE
7. OIL PUMP BODY
8. OIL PUMP PRIMING VALVE, SPRING 8 SPRING SEAT
16. Remove reverse clutch piston.
17. Remove priming valve from oil pump body by
lightly tapping with a drift through the hole at the
rear of oil pump. (Only if diagnosis requires removal
or if excessive dirt has passed through transmission.)
18. Pressure regulator and boost valve may be
removed by using a pari of wire cutters to remove the
retaining pin. Due to the difficulty of removing the
retaining pin, it is not recommended that the pres-
sure regulator valve and boost valve be disassembled
during overhaul, unless it was determined by oil
pressure checks to have been malfunctioning prior to
tear down.
19. Remove pressure regulator boost valve sleeve,
spring, pressure regulator valve and two washers. See
Figure
7C-147.20. Inspect and if necessary replace the oil pump hub
bushing by threading a 3/4” standard pipe tap such
as tool J-23130-5 into bushing. See Figure
7C-148.Figure 7C-148

AUTOMATIC TRANSMISSION 7C-109
Figure 7C-149
21. Using a drift on tap, press out oil pump bushing
with arbor press. Use rag or cloth to protect oil pumpface.22. Install new oil pump hub bushing with arbor
press using tool J-23130-1. See Figure
7C-149. Clean
pump body, including all holes and pockets
thoroughly. With oil pump shaft hole “A” facing
downward, scribe an aligning mark on oil pump
shaft inner diameter at the center of the oil groove
to the right of hole “A”. Scribe mark on outer edge
of bushing through the centers of the small and large
drilled holes “B”. Place bushing into oil pump shaft
with small hole up, and align scribe marks on bush-
ing with those made in oil pump shaft. Use arbor
press to drive bushing into oil pump shaft until
seated in the bore. Care must be taken so that bush-
ing is pressed in straight, using the scribe marks as
a guide until firmly seated.
23. Inspect and thoroughly clean the pressure regula-
tor and priming valve assemblies. Immerse all valves
in transmission fluid before installing in bores.
24. Install pressure regulator valve in oil pump body
bore. See Figure
7C-150.25. Install pressure regulator valve, two spring seats,
spring, boost valve and sleeve in oil pump body bore.
26. Depress pressure regulator boost valve sleeve un-
til backend lines up with pin hole and insert pin to
XWP$.27. Install priming valve assembly from front face of
pump. Priming valve retainer should be pressed in
flush with surface of oil pump body. See Figure 7C-
151.28. Inspect oil pump hub oil seal rings. Replace if
damaged or side wear is noted. See Figure
7C-152.29. Inspect reverse clutch piston for damage, Re-
place if necessary.
Figure
7C-150