1973 OPEL GT-R lock

d. Operation of Controls in Drive Range Third Geat
Reverse Clutch ReleasedThird Clutch-Applied
Second Clutchs AppliedLow Band Released
Sprag Locked
As vehicle speed increases. the governor allows more oil to pass through to act against the wring
at the 2 3 shift valve. This allows the second clutch oil at
the 2 3 shift valve
10 be released and pan through the valve as third clutch oil, directed tothe third clutch piston to apply third clutch. At the same time,
third clutch oil is directed
to the 3 2 control valve. acting against the spring and modulator oil. cutting off modulator oil pressure to the 2. 3 shift controlyalve. Third control oil also is directed to the Reverse and Law control valve and pasts through thevalveasservo release oil to the lowspeed downshift
timing valve. The low speed downshih timing valve is held
open against the spring by increased modulator oil pressure. The oil passes through the valve and
is directed
to the top of the low band sewo. to act with the servo piston spring and force the sel~o piston downward. releasing the low band.
The second clutch is on, the third clutch is on, the band is released. The transmikn is in drive range third gear

f. Operation of Controls in Low Range First GeaReverse Clutch ReleasedThird Clutch Applied
Second Clutch Released
Low Band Applied
Sprag Locked
When the
selector lever is moved to the low position on the quadrant. the manualvalve is positioned to allow drive oil, intermediate oil and low oil to pass
through the valve. Low oil is directed to the
1 2 shift valve train which acts with the I 2 shift valve spring against governor oil pressure to close off drive
oil from passing into the second clutch passage. At the
same time, low oil is directed to the Reverse and Low control valve and acts against the spring to
allow detent regulated oil at the Reverse and Law control
valve to flow to the 2 3 shift valve, which is bottomed in its bore by intermediate oil pressxeand the valve spring. The detent oil
pazses through the 2 3 shift vahre and into the third clutch oil passages to apply the third clutch and to close off
modulator oil pressure from the 3-2 control valve to the 2 3 shift control valve. Third control oil isalSo directed to the Reverse and Law control
valve.which is held open against its spring by low oil pressure. and closes off the
source of rupply to the servo release pasege. to allow the servo to apply the low
band. Intermediate oil seats the check ball at the Reverse
passage at the presue regulator boost valve cavity and continues to the pressure regulator valve
to increase oil pressure in the circuit.
iThe third clutch in on, the band is on. The transmi&n is in Low Range First Gear

9. Operation of Controls in Reverse
Reverse Clutch -Applied
Second Clutch Released
Sprag LockedThird Clutch. Applied
Low Band. Released
When the selector leer is moved to the Reverse position on the quadrant, the manual
valve ispositioned to allow Revert oil to pars through the manual
valve into the
Reverse oil passage. The reverse oil applies the reverse clutch. and a portion is directed to the priming valve which acts as a damper until the
line is filled. to effect a smooth and firm apply of the
reverss clutch. At the wne time, reverse oil is directed to the pressure regulator boost control valve
cavity to seat the check ball and prevent reverse oil pasring into the intermediate oil passage. It is then directed to the pressure regulator boast valve forcing
Reverse oil is also directed to act on the end of the
Reverse and Law control valve against the spring to allow detent regulated oil to pass through the valveto the 2 3 shift
valve. The detent regulated oil passes through the 2 3 shift valve and into the third clutch oil passages to apply the third clutch. The third
clutch oil
al= acts on the end of the 3 2 control valve against the spring and modulator oil pressure, clodng off the supply of modulator oil to the 2 3
shift control valve. Third clutch oil at the rwerse and low control valve is closed off from
parring through the valve. and into the servo releal~ parrage.Summary
The
reverse clutch is cm and the third clutch is on. The transmission is in Reverse Range.

7C. 841973 OPEL SERVICE MANUALConditionCause8. No starting in “R” range
(proper driving in all other
ranges).a) Reverse clutch failure.
9. Drive in selector lever
position “N”.a) Inadequate selector lever linkage.
b) Planetary gear set broken.
c) Improper adjustment of band.
Gear Change1. No l-2 upshift in “D” and “S”
(transmission remains in 1st gear
at all speeds).a) Governor valves stuck.
b) 1-2 shift valve stuck in 1st gear
position.
c) Seal rings (oil pump hub) leaky.
d) Large leak in governor pressure circuit.
e) Governor screen clogged.
2. No 2-3 upshift in “D” (trans-
mission remains in 2nd gear at all
speeds).a) 2-3 shift valve stuck.
b) Large leak in governor pressure circuit.
3. Upshifts in “D” and “S” only
at full throttle.a) Failed vacuum modulator.
b) Modulator vacuum line leaky or
interrupted.
c) Leak in any part of engine or
accessory vacuum system.
d) Detent valve or cable stuck.
4. Upshifts in “D” and “S” only
at part throttle (no detent
upshift).a) Detent pressure regulator valve stuck.
b) Detent cable broken or misadjusted.
5. Driving only in 1st gear of
“D” and “S” range (transmission
blocks in 2nd gear and “R”).a) “L” and “R” control valve stuck in
“L” or “R” position.
6. No part throttle 3-2 downshift
at low vehicle speeds.a) 3-2 downshift control valve stuck.
7. No forced downshift.a) Detent cable broken or improperly
adjusted.
b) Detent pressure regulator valve stuck.

7C- 881973 OPEL SERVICE MANUAL
Condition
6. Abrupt 3-2 coast downshift.Cause
a) Low speed downshift timing valve
stuck open.
7. Flare on high speed forceda) Low oil pressure.
downshift.b) Band adjustment loose
8. Flare on low speed forced
downshift.a) Low oil pressure.
b) Band adjustment loose.
c) High speed downshift timing valve
stuck in closed position.
d) Sprag race does not grip on 3-1 down shifting
Engine Braking
1. No engine braking in “L” range.a) Selector lever linkage improperly
adjusted.
b) Manual low control valve stuck.
2. No engine braking in “S” range.a) Selector lever linkage improperly
adjusted.
3. No park.a) Selector lever linkage improperly
adjusted.
b) Parking lock actuator spring.
c) Parking pawl.
d) Governor hub.
Noises1. Excessive noises in all drive
ranges.a) Too much backlash between sun gear
and planetary gears.
b) Lock plate on planetary carrier loose.
c) Thrust bearing defective.
d) Bearing bushings worn.
e) Excessive transmission axial play.
f) Unhooked parking paw1 spring contacts
governor hub.
g) Converter balancing weights loose.
h) Converter housing attaching bolt
loose and contacting converter.
2. Screaching noise when starting.
3. Short vibrating, hissing noise
shortly before 1-2 upshift.a) Converter failure.
a) Dampening cushion of reverse clutch
wearing into transmission case.
Abrasive
1. Excessive amount of iron dust
(can be picked up by magnet
in oil pan).a) Oil pump.
b) Governor hub.
c) Second clutch hub
2. Excessive amount of aluminum
dust (cannot be picked up by
magnet) in oil pan.a) Thrust face in case.
b) Rear bore of case.
c) Stator thrust washer
- check
converter end clearance.

AUTOMATIC TRANSMISSION 7C- 91
MAINTENANCE AND ADJUSTMENTS
DETENT CABLE REPLACEMENT AND
ADJUSTMENT
The reliability of the detent bowden control cable is
greatly dependent upon the proper adjustment of the
wire whenever installation is being made. It is impor-
tant to remember that the free end of the wire is not
kinked, as individual strands will break due to the
continuous bending during operation. To avoid this
situation, it is important that the bowden control
cable be properly installed. Although replacement
and adjustment procedures on various models are
identical, the location of the upper, or throttle, end
of the detent cable may vary. For proper model iden-
tification, see Figures
7C-61, 7C-62, 7C-63, and 7C-
64.Figure JC-79 Opel 1900 and Manta
Figure
7~80 Opel 1900 and MantaFigure JC-81 GT Models
Figure JC-93 GT Models
Removal
I. Detach retainer at detent cable to accelerator link-
age.2. Loosen rear transmission crossmember from body
and remove right side bolt. See Figure
7C-84, Callout
” A ”3. Insert block of wood between floor pan and right
rear corner of transmission to expose detent cable
bracket at transmission. See Figure
7C-85.4. Unscrew detent cable connecting retainer from
transmission and pull cable out of transmission. See
Figure
7C-86.

7C- 92
1973 OPEL SERVICE MANUAL
Figure 7C-84Figure
7C-855. Unhook detent cable from detent valve. See Figure7c-87.
6. Pry detent cable pipe out of retainers.
7. Unscrew upper and lower adjuster nuts and
remove detent cable (on Manta models, loosen lock
nut and screw adjuster out of bulkhead).
Installation
1. Route cable and place in retainers,
2. Place cable in upper bracket and install upper and
lower adjuster nuts and retainer (on Manta models,
screw adjuster into bulkhead).
3. Hook detent cable to valve and install retainer.Figure
7C-86Figure
7C.87
AdjustmentBefore carrying out any adjustment to the detent
cable, it is essential that the throttle control linkage
is correctly adjusted so that full throttle opening is
obtained at the carburetor.
After the throttle control linkage has been set, the
adjustment for the detent cable may be checked as
FOllOWS:1. Position accelerator to full throttle (pedal is nol
fully depressed at full throttle) and loosen and
tighten upper and lower adjuster nuts of detent cable

7C. 941973 OPEL SERVICE MANUAL
7. Drive out retaining pin and shaft and remove se-
lector detent. See Figure 7C-93.Figure
7C-93Figure
7C-94 - Exploded View of Selector Lever
8. To replace bowden cable in selector lever, knock
off selector handle, remove screws from clamping
piece and pull knob.
9. Remove pull knob and bowden cable, taking care
not to lose lock bolt bushing, thrust springs, ‘and
washer.
10. Place thrust spring, bushing, washer, and thrust
spring onto new bowden cable, in that order, and
insert cable into selector lever.
1 I. Slide pull onto selector lever and clamping piece
onto cable.
12. Heat up new selector lever handle in water to 176
degrees F. and push onto selector lever.
13. Set dimension between pull knob and selector
lever handle at
.4 inch and tighten set screws.
14. Lubricate selector lever detent and shaft. Install
detent, align selector lever with support, install shaft,
and drive in new retaining pin.
15. Install assembly to support housing and install
intermediate selector lever.
16. Install assembly to vehicle and install neutral
start switch.
17. Install console lights and cigar lighter connec-
tions to console and install console to vehicle.
18. Lubricate and connect selector rod to intermedi-
ate selector lever and adjust according to Figure 7C-
198.
MAJOR REPAIRREMOVAL AND INSTALLATION OF AUTOMATIC
TRANSMISSION
Removal
- Opel 1900 and Manta
I. Disconnect battery.
2. Remove dipstick.
3. Remove screws from fan shroud.
4. Remove 2 upper starter bolts.
5. Raise car and provide support for front and rear
and drain oil.
6. Remove bolts from engine support brackets, both
sides. Let brackets hang by front bolts. See Figure7c-105.
7. Remove flywheel cover pan.
8. Remove exhaust pipe from manifold and unhook
rubber tailpipe suspension.
9. Remove drive shaft. Do not misplace thrust spring
in spline.
10. Disconnect cooler lines at flexible hoses.
II. Detach both stabilizer supports from
crossmem-ber to body supports and loosen stabilizer bolts in
lower control arms. See Figure X-84, Callout “B”,