1973 OPEL GT-R maintenance

1F. 46 1973 OPEL SERVICE MANUAL
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Headlight High-Low Beam Control and Passing:
SignalI
When the headlights have been switched on, high
and low beam selection is made by raising the direc-
tional signal lever toward steering wheel. Each
ti&the lever is raised, beam position, will change.
When the headlights are not on, a flashing headlight
signal may be given by raising and lotiering the di-
rectional signal lever. With the headlights on and
inlow beam position, raising and lowering the direc-
tional signal lever will also cause the headlights to
flash.
Fog Light SwitchAll Rallye models are equipped with two white f?g
lights mounted below the front bumper.
The fog light toggle switch is located on the
insty-ment cluster to the left of the temperature and
fuelgauge cluster.
/
The fog lights can be turned off at any time by the
toggle switch, but can only be tyrned on when: :
1. The ignition switch on or the
?gine running.!
2. The fog light toggle switch lower half is pushed
in.3. The parking lights and/or low beam headlights
are
OKThe fog lights are automatically turned off if the
ignition switch is on and the headlights are switched
to high beam position.
Courtesy LightThe courtesy light illuminates the interior of the Car
when any door is opened. The courtesy light can also
be turned on with all doors closed by tilting the l&s.
GT Headlamp MechanismThe concealed headlamps are moved mechanically.
Pushing actuating lever on left side of console opens
headlamps and pulling lever closes headlamps. Two
(2) meshing gear segments convert the movement, of
the lever to a rotation of 180 degrees. The pivots of
the headlamps lie below the centerline so that with
headlamps in closed position, the headlamp housing
is flush with front sheet metal. Refer to Group 110,
Section “F”, for service procedures on the GT head-
lamp mechanism.
A white indicator lamp in the instrument panel lights
if the headlamps are not completely opened lorclosed The switches of the headlamp electrical sys-
tem are located behind the left headlamp operating,
mechanism.
MAINTENANCE AND ADJUSTMENTSHEADLAMP AIMING
The headlamps must be properly aimed in order to
obtain maximum road illumination and safety that
has been built into the headlighting equipment. With
the Guide T-3 type sealed beam units, proper aiming
is even more important because the increased range
and power of this lamp make even slight variations
from recommended aiming hazardous to approach-
ing motorists. The headlamps must be checked for
proper aim whenever a sealed beam unit is replaced
and after an adjustment or repairs of the front end
sheet metal assembly.
Regardless of method used for checking headlamp
aim, car must be at normal weight, that is, with gas,
oil, water, and spare tire. Tires must be uniformly
inflated to specified pressure. If car will regularly
carry an unusual load in rear compartment, or a
trailer, these loads should be on car when headlamps
are checked. Some States have special requirements
for headlamp aiming adjustment, and these require-
ments should be known and observed.
Horizontal and vertical aiming of each seal beam
unit is provided by two adjusting screws which move
the mounting ring in the body against the tension of
the coil spring. There is no adjustment for focus,
since the sealed beam unit is set for proper focus
during manufacturing assembly.
MAJOR REPAIRHEADLIGHT SWITCH
- OPEL 1900. MANTA
Removal1. Remove instrument cluster cover panel. See Sec-
tion H.
2. Compress retaining springs and pull switch out.
See Figure 1 F-
1.3. Pull multiple socket off switch.
Installation
1: Plug multiple socket in switch and push switch in
panel until clips lock in place.
2. Replace instrument cover and secure with two (2)
screws.

lG- 54 1973 OPEL SERVICE’ MANtiAL/SIGNAL SYSTEMSCdNTENTS
9Subject
DESCRIPTION AND OPERAT!ON:
Directional Signal Lever
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horn. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .HazardWarning
Flasher. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .BrakeSystemWarningLight
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DIAGNOSIS:
SignalSystem,.......................
i . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .MAINTENANCE AND ADJUS,TMENTS:
MAJOR REPAIR:
Directional Signal Switch
:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HornRemoval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Removing Horn Contact
. . . . :.............................................
SPECIFICATIONS:
FuseChart. . . . . . I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page No.
1 G-54
1 G-54
1 G-55
lG-55 _1 G-55
1 G-55
16-551 G-55
1 G-56
DESCRIPTION AND OPERATION
DIRECTIONAL SIGNAL LEVERThe direction signal switch lever is a multi- purpose
lever controlling direction signals, passing signal,
and high and low beams. See Figure
lG-1.301Gl
Figure lG-1 Directional Signal Position for Headlamp
OperationThe direction signal lever is provided with a
two-step mechanism for operation of headlight high and
low beams, and passing signal (not in New Jersey).
With headlights off, moving the lever repeatedly to-
wards steering wheel flashes headlights as a passing
signal. With headlights on, moving the lever repeat-
edly towards steering wheel up to first stop also
flashes passing signal regardless whether or not the
direcl:ion signals are switched on. When the lever is
moved up to the second stop, the headlights are
changed from high to low beam
dr vice versa. On all
Rallye cars, when switching from low to high beam
position, with the fog lamp instrument panel switch
“ON” and ignition switch in “RUN” position, the
fog lights are automatically
switChed off. Direction
signals work in the normal manner; pushing the lever
up for right turn signal and pulling the lever down
for left turn signal.
The horn button is located in the center part of the
steering wheel. The horn is actuated by pushing
down on the ends of both spokes on Opel 1900 andManta’s or on the center horn button on the Rallye.
The button is provided with a spring-loaded plunger.See Figure
lG-2.

,I
IINSTRUMENT PANEL
lH- 57
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/SubjectPage No. INSTRUMENT PANEL
CONTENTS
DESCRIPTION AND OPERATION:
Instrument Panel
- Opel 1900 - Manta. . . . . . . . . . . . . . . . . . . . . .Instrument
Panel-GT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DIAGNOSIS:
MAINTENANCE AND ADJUSTMENTS:
MAJOR REPAIR:
Instrument Cluster Housing
- Opel 1900 - Manta . .
Windshield Wiper Switch
. , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .InstrumentCluster
Bulbs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .InstrumentCluster
Housing-GT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Combined Switch Assemblies
. . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .CigarLighter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .SPECIFICATIONS: (Not Applicable)
I H-57
1H-58
1H-59
1H-61
lH-61
1H-61
1H-63
1H-64
DESCF(lPTlON AND OPERATION2. The fog light toggle switch lower half is pushed in.INSTRUFENT PANEL (OPEL 1900. MANTA)
Headligl$ Switch
3. The parking lights and/or low beam headlights are
on.The thr& position light switch controls the head-
lights, @lights, parking lights, side marker lights,
license
plate light and instrument panel lights and is
located
4t the lower left on the instrument panel.
With thk switch knob pulled outward to the first
stop,
thi parking lights, side marker lights, license
plate
ligiit and instrument panel lights will light. Theinstrumdnt panel lights can be turned off by turning
the
lightSwitch knob counterclockwise past the first
detent. IThe fog lights are automatically turned off if the
ignition switch is on and the headlights are on high
beam.
Windshield Wiper Switch
The windshield wiper switch is located on the instru-ment panel to the right of the headlight switch.
By pull&g the lightswitch knob out all the way, the
headlights will also be turned on.
IBy pushing the lower half of this switch in to the first
stop, the wipers will operate at slow speed. By push-ing in to the second stop, the wipers will operate at
fast speed.
Fog
Ligh) Switch (Rallye)The fog
iight toggle switch is located in the instru-
ment cluster to the left of the temperature and fuel
gauge
cl+ster. The fog lights can be turned off at any
time by
t,he toggle switch, but can only be turned on
when: ,
Electrically Heated Rear Window Switch (If
Equipped)The heated rear
wind&v switch is located in the
instrument panel to the right of the clock opening.
1. The ignition switch is on or the engine running.
ITo operate (only possible with the engine running),
push in on the lower half of the switch. When the
rear window is being heated, the switch will
belighted.

GAUGES
CONTENTS
Subject
DESCRIPTION AND OPERATION:
DIAGNOSIS:
Temperature and Fuel Gauge
System-Opel1900-Manta. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FuelGauge-GT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .MAINTENANCE AND ADJUSTMENTS:
MAJOR REPAIR:
Opel 1900
- Manta
Voltage Stabilizer
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Speedometer
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Electric
ClockorTachometer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Temperature Indicator or Fuel Gauge
. . . . . . . . . . . . . . . . . . . .Rallye
Gauges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Temperature
SendingUnit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Oil Pressure Sending Unit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .GT
Speedometer
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tachometer
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Temperature Indicator and Fuel Gauge Dash, Unit
Electric
Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Ammeter
andOilPressureGauge. . . . . . . . . . . . . . . . . . . . . . . . . . . .SPECIFICATIONS:
DIAGNOSISITEM(ERATURE
& FUEL GAUGE - SYSTEM
DIAGNOSIS (OPEL 1900, MANTA)
/
ConditionPossible Cause
I
Page No.
1l-65
1l-67
1l-67
1l-68
1l-68
1l-69
1l-69
1l-69
1l-70
1l-70
1l-70
1l-70
1l-71
1l-71
Correction
Temperature and gas gaugeinopetative1. Blown fuse1. Replace fuse. If new fuse
blows, repair short.
2. Defective voltage
stabilizer1. Install 40 ohm resistors
between ground
& connectors
(disconnect from units)
of temperature sending imit
and gas gauge tank unit. If
both dash units do not move
to full scale (tolerance
-one pointer width of either
side of full scale reading)
and the distance of movement
on the scale is the same,,
replace the voltage stabdner.

I2A- 21973 OPEL SERVICE MANUAL
GENERAL INFORlVlATION
CONTENTS
SubjectPage No.
DESCRIPTION AND OPERATION: (Not Applicable)
DIAGNOSIS: (Not Applicable)
MAINTENANCE AND ADJUSTMENTS:
PaintMaintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2A-2
ChromeMaintenance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2A-2
StainRemoval
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2A-2
MAJOR REPAIR: (Not Applicable)
SPECIFICATIONS:
Bolt
TorqueSpecifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2A-4
Special Body Tools
. . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2A-5
MAINTENANCE AND ADJUSTMENTSPAINT MAINTENANCE
To remove heavy concentrations of road dirt and
grime, it is recommended that the car be washed
using an automotive shampoo or mild soap, and cold
to lukewarm water. Use of harsh soaps or detergents
is not advised. In areas where salt is used on the
roads during the winter months, more frequentwashing is recommended.
Use of cleaners and polishes are required if no high
luster is obtainable by waxing. To protect the paint
finish, sparingly apply several coats of wax. Each
coat should be thoroughly rubbed to remove any
surplus wax.
Once the car is properly waxed, road dirt may easily
be removed by use of cold to lukewarm water and a
sponge. Dry by use of a chamois.
CHROME MAINTENANCE
Chrome parts should be washed with water and a
mild detergent. If rust or salt corrosion should ap-
pear, they may be removed with Buick Rust Eraser
or equivalent. Do not use scouring powders or stiff
brushes.STAIN REMOVAL
Before attempting to remove spots or stains from
upholstery fabrics, determine as accurately as possi-
ble: (1) Nature and age of the spot or stain. (2) The
affect of stain removing agents on the color, struc-
ture and general appearance of the fabric.
For best results, stains should be removed from
upholstery as soon as possible after they have been
made. If they are allowed to stand for some time,
they often become set, and removal becomes more
diffxult and frequently impossible.
There are three basic types of acceptable’ cleaners
available to car owners: (1) Volatile cleaners, (2) Syn-
thetic detergents, (3) Neutral soap (non-alkaline).
The volatile cleaners are recommended since they
have great solvent powers for grease, oils and general
road grime. Synthetic detergents generally loosen
stains satisfactorily, however, the use of improper
type detergents (containing bleach) involves risk of
damage to the color or finish of fabrics.
Precautions For Cleaning FabricsDo not use laundry soap or detergents containing
bleaches. The use of these agents tends to weaken
fabric and to change its color. Do
not use too much
cleaning fluid. Some interior trim assemblies are pad-

2B- 61973 OPEL SERVICE MANUAL
OPEL 1900, MANTA AND GT FRAME ANDBODY
MOUNTINGS
CONTENTS
Subject
DESCRIPTION AND OPERATION: (Not Applicable)
DIAGNOSIS: (Not Applicable)
MAINTENANCE AND ADJUSTMENTS: (Not
Applicable)
MAJOR REPAIR: (Not Applicable)
SPECIFICATIONS:
FrameandBodyMountingSpecifications. . . . . . . . . . . . . . . .Page No.28-6LOWER
I.
1.Ii
NOTE: TOLERANCES
NOTTOEXCEED*1,16I IDATUM LINEZB2
Figure
ZB-2 GT Frame Details

WINDOWS AND WINDOW MOLDINGS2c-9WINDOWS AND WINDOW MOLDINGS
CONTENTS
Subject
DESCRIPTION AND OPERATION: (Not Applicable)
DIAGNOSIS: (Not Applicable)
MAINTENANCE AND ADJUSTMENTS: (Not
Applicable)
MAJOR REPAIR:
Removal and Installation
Windshield
RevealMolding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Windshield
andBackWindow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DoorWindow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Rear Quarter Window Molding
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Rear Quarter Window
-1900 -Manta. . . . . . . . . . . . . . . . . .RearQuarterWindow
-GT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RearQuarterWindowLock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .SPECIFICATIONS: (Not Applicable)Page No.
2c- 9
2c-10
2c-11
2c-11
2c-12
2c-12
2c-12
MAJOR REPAIR
REMOVAL AND INSTALLATION OF WINDSHIELD3. With Tools J-2 1828 and J-2 1549, insert new reveal
REVEAL MOLDINGmolding and install escutcheon.
1. Remove reveal molding escutcheon. Starting at
one end, pull molding out of rubber channel. See
Figure
2C-2.Figure ZC-2 Removing Reveal Molding
Figure ZC-3 Pushing Windshield Out 2. Prior to installation, place molding in water and
heat up to approximately 113
- 122 degrees F.

DOORS
CONTENTS
Subject
DESCRIPTION AND OPERATION: (Not Applicable)
DIAGNOSIS: (Not Applicable)
MAINTENANCE AND ADJUSTMENTS: (Not
Applicable)
MAJOR REPAIR:
Front Door - Removal and Installation
DoorLockStriker..........................................................
WindowRegulator
Handle..........................................
Trim
Pad............................................................................
DoorHandle.Inside......................................................
RevealMolding................................................................
WindowLifter..................................................................
DoorLockCylinder........................................................
Weatherstrip....................................................................
Door....................................................................................
Rear Door
- Removal and Installation
SashWindow..................................................................
Window Regulator........................................................
TailGate............................................................................
Door....................................................................................
SPECIFICATIONS:Page No.
2D-13
2D-13
2D-13
2D-15
2D-1520-l
5
2D-17
2D-10
20-18
2D-19
2D-20
2D-21
2D-21
MAJOR REPAIRREMOVAL AND INSTALLATION OF DOOR LOCK
STRIKER1. Mark position of old striker on lock pillar and
unscrew striker, using Tool J-23659. See Figure
2D-2.2. Place new striker in installation position and tem-
porarily tighten striker, observing marking on lock
pillar. Close door and check whether this can be
done without exerting any force. If this is not the
case, adjust striker accordingly.
3. Tighten attaching screws, using Tool J-23659, and
check for proper operation.REMOVAL AND INSTALLATION OF WINDOW
REGULATOR HANDLE1. Insert Tool J-7797 between handle and nylon disc.
See Figure
2D-3.2. With the two fork-shaped ends of the tool, slide
lock spring outwards. See Figure
2D-4.3. Place lock spring of new handle in installation
position and install it onto window regulator shaft.
4. With the window in closed position, the window
regulator handle should point upwards towards the
front at an angle of approximately 45 degrees.
REMOVAL AND INSTALLATION OF FRONT
DOORTRIM PAD
1. Remove window regulator handle.