gear OPEL MANTA 1973 Service Manual

AUTOMATIC TRANSMISSION 7C- 61
d. DRIVE RANGE - THIRD GEAR
Drive Range
- Third Gear
Reverse Clutch
- Released
Second Clutch. Applied
Sprag . LockedThird Clutch -Applied
Low Band
- Released
In Drive Range
- Third Gear, the low band is released and both the second and third clutches are applied.
In this condition, the ring gear is locked o the input sun gear. With two planetary members connected
inthismanner, the entire planetary system will rotate as a solid unit and provide a direct drive with a ratio of 1 to 1. The
input is split between the ring gear end input sun, and the rarrier is the output member.
Figure 7C-5 1 Drive Range Third Gear

c. Operation of Controls in Drive Range Second Gear
Reverse Clutch
ReleasedThird Clutch Released
Second Clutch AppliedLow Band Applied
Sprag Over Running
As the vehicle increws speed. the govwnor
allow more drive oil 10 pass through, and this increased pressure, acting on the end of the 1 2 shift
vahre. overcomes the I 2 shift valve spring pressure and allovn drive oil 10 pasr through the valve to feed the second clutch oil parsages.Second clutch oil passes through the second clutch orifice control valve, seating the ball and is metered to the second clutch piRon
to begin to apply
the second clutch, whileportion of the oil is directed
10 the accumulator. As the upper portion of the accumulator fills with second clutch oil. itovercomes the leer prewre of 1 2 accumulator oil and spring at the bottom of the accumulator piston. forcing the piston downward. The upper
portion of the accumulator is now filled, allowing full oil preaure
to the second clutch piEton far the final apply. The accumulator, therefore, acts as a
reservoir
10 produce a damping effect for a smooth second clutch apply and the 1 2 shift.
Second clutch oil from the 1 2 shift
valve is simultaneously directed to the 2 3 shift valve to be used as the oil source for the 2 3 shift.
Summary
The second clutch is on. the band is on, the transmission is in drive range
i second gear.

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

e. Operation of Controls in Second Range Second Gear
Reverse Clutch
Re easedThird Clutch Released
Seconds Clutch AppliedLow Band Applied
Sprag Over Running
The
selector lever is moved to the Intermediate position an the quadrant. the manual valve is positioned to allow drive oil and Intermediate oilto pan through the valve. Intermediate oil is directed
to the pressure regulator boost control cavity, seating the check ball at the reverse passage.Intermediate oil is then directed to the pressure regulator valve downward to
increaSe the oil prepare in the circuit. At the same time. the inter.
mediate oil from the manual valve is directed lo the 2 3 shift valve train closing off the supply of third clutch oil in the circuit, which isexhausted
through the Reverse and Low control
valve.
SummaryWith third clutch oil exhausted. the third clutch is off, the second clutch is an, the low band
servo is applied. The transmission is in second
Range Second 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

h. Operation of Controlr during Detent Downshift Valves in Second Gear Position
Reverse Clutch Released
Second Clutch Applied
Sprag Over RunningThird Clutch Released
Low Band Applied
With the selector in the Drive position. detent downshifts ore possible by fully depressing the accelerator pedal. This causes the mechanical linkage to the
detent
velve to move the detent valve, cutting off moduahor oil to the 3 2 control valve, the 1 2 shift control valve, the 1 2 accumulator valve and the
2 - 3 shift control velve.The mechanical linkage holding the detent nlve open allows the detent regulated oil to pass into the detent oil
passdgeand is directed to the 2 3 shift
control
valve. acting against the spring and governor oil pressure. It is also directed to the 3 2 control valve. acting against the spring, allowing detent oil to
pass through the valve and act on the end of the 2 3 shift control valve to keep the valve bottomed in its bore again* governor oil pressure. Second clutch
oil et the 2 3 shift
valve is closed off from passing into the third clutch passages by the detent oil pressure holding the 2 3 shift valve bottomed in its bore.
Summary
The second clutch is on, the low band is on. The valves are in
wand gear position under detent conditions.

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.

AlITOMATIC TRANSMISSION 7C- 85
ConditionCtSlSl?8. After full throttle upshifting
transmission shifts immediately
into lower gear upon easing off
accelerator pedal.a) Detent valve stuck in open position,
b) Detent cable stuck.
c) Modulator vacuum line interrupted.
9. At higher speeds, transmission
shifts into lower gear.a) Retaining pin of selector lever shaft
in transmission dropped out.
b) Loose connection of selector lever
linkage to manual valve.
c) Pressure loss at governor.
10. Hard disengagement of selector
lever from “P” position.a) Steel guide bushing of parking
paw1actuating rod missing.
b) Manual selector lever stuck.
Shifts1. Slipping l-2 upshifts (engine
flares).a) Low oil pressure.
b) Sealing ball in valve body dropped out.
c) Second clutch piston seals leaking.
d) Second clutch piston centrifugal ball
stuck open.
e) Second clutch piston cracked or broken.
f) Second clutch plates worn.
g) Seal rings of oil pump hub leaky.
2. Slipping 2-3 upshifts (engine
flares).a) Low oil pressure.
b) Band adjustment loose.
c) Third clutch piston seals leaking.
d) Third clutch piston centrifugal ball
stuck open.
e) Third clutch piston cracked or broken.
f) Wear of input shaft bushing.
g) Sealing ball in valve body dropped out
3. Abrupt l-2 upshift.a) High oil pressure.
b) l-2 accumulator valve stuck.
c) Spring cushion of second clutch broken,
d) Second gear ball valve missing.
4. Abrupt 2-3 upshift.
a) High oil pressure
b) Incorrect band adjustment.
5. Abrupt 3-2 detent downshift at
high speed.a) High speed downshift valve stuck open.
b) Band adjustment.

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 JC- 97
Figure 7C-101Figure 7C-103
Figure 7C-102
19. Pry detent cable and oil cooler pipes out of retain-
ers on transmission oil pan.
20. Unscrew speedometer cable and pull it out of
speedometer driven gear housing.
21. On both engine sides unscrew engine support
brackets from torque converter housing. Slacken’
front attaching bolt only. See Figure
7C-105.22. Remove torque converter housing cover plate.Figure 7C-104
23. Mark flex plate and converter for reassembly in
same position.
24. Unscrew the three torque converter to
flex plate
attaching bolts. See Figure
7C-106.25. Pry transmission loose from engine.
26. Move transmission rearward to provide clear-
ance between converter and flex plate to install con-
verter holding tool J-21366. Lower transmission and
move to bench.