1973 OPEL GT-R length

CARBURETOR AND THROTTLE LINKAGE6E- 51
water, adjust the throttle stop screw to read 6 inches
of water (3 inches down and 3 inches up).
4. Disconnect manometer and reconnect the vacuum
advance hose.
5. Adjust idle air speed screw and mixture screw to
obtain maximum idle at 850 to 900 R.P.M. (auto-
matic transmission) or 900 to 950 R.P.M. (manual
transmission).
6. Make final adjustment by turning idle mixture
screw in to reduce idle speed 50 R.P.M.
7. Install red plastic caps over the air speed screw
and idle mixture screw. Replace plastic cap over the
throttle valve stop screw and secure in place with
Loctite.
Fast Idle Speed Adjustment
1. Remove air cleaner cover.
2. With engine off, open the throttle halfway and
close the choke valve, release the throttle, then re-
lease the choke.
3. Start engine without moving the throttle. Adjust
to 3200 to 3300 R.P.M. using 2 nuts on fast idle rod.
See Figures 6E-13 and
6E-14.Figure
6E-13 Decreasing Fast Idle Speed
CARBURETOR LINKAGE ADJUSTMENT
GT Series1. Remove air cleaner.
2. Have helper depress accelerator pedal to floor and
check to see if wide open throttle is reached at carbu-
retor.
3. If adjustment is necessary, proceed as follows:
6E-14Figure
6E-14 Increasing Fast Idle Speed
(a) Unhook accelerator pedal return spring.
(b) Remove lock spring at upper end of vertical con-
trol rod and detach rod.
(c) Lengthen or shorten control rod so that wide
open throttle is obtained at the carburetor when ac-
celerator pedal is
l/4” - l/2” from floor mat.
(d) Reinstall rod, lock spring and pedal return
spring.
Opel 19W and Manta SeriesThe carburetor bowden control wire is properly ad-
justed if, with correctly-adjusted engine idle speed,
engine at operating temperature and accelerator
pedal at an angle of 25 degrees to the vertical plane,
the ball (A) of the carburetor bowden control wire
rests against the accelerator pedal lever. See Figure
6E-15.
1. Position accelerator pedal at an angle of 25 degrees
to the vertical plane. To do this, loosen lock nut of
adjusting bolt (c) and unscrew adjusting bolt a few
turns.
Squeeze a 1 3/S” wood block (D) between accelera-
tor pedal and dash panel. See Figure
6E-15.Screw in adjusting bolt until the accelerator pedal
lever releases the wood block (D). Tighten lock nut.
2. Adjust bowden control wire at adjuster. See Figure
6E-16. Prior to doing this, adjust engine idle speed
with engine at operating temperature.
Set carburetor bowden control wire adjuster at the
bracket so that the ball (A) of the control wire rests
against part (B) of the accelerator pedal lever and the
wire core between bracket and segmental disc is not
sagging.

7A- 41973 dPEL SERVICE MANUALConditionPossible CauseCorrectionHeat-blued driven plate
and pressure plate
assembly.
1. Improper pedal1. Replace only driven plate, and
adjustment.adjust clutch pedal and cable.
Grab and chatter with
oil present on clutch
assembly.1. Oil leak.1. Correct oil leakage, clean
pressure plate in solvent, replace
driven plate and adjust pedal lash.
MAINTENANCE AND ADJUSTMENTS
CLUTCH LASH ADJUSTMENT
GTPedal lash, free pedal travel must be adjusted occa-
sionally to compensate for normal wear of the clutch
facings. As the driven plate wears thinner, pedal lash
decreases. Adjust clutch pedal free travel only with
ball stud located on right side of clutch housing if
cable length is not to be changed. To adjust pedal
lash proceed as follows:
1. Loosen lock nut on ball stud end located to the
right of the transmission on the clutch housing. Posi-
tion ball stud so that the outer end protrudes 3/4
inches out of housing and finger tighten lock nut. See
Figures
7A-1 and 7A-6.
2. Adjust ball stud, pivoting clutch release fork, to
obtain 3/4 to
l-1/4 inches pedal lash, free pedal. See
Figure 7A-6.
Opel 1900 and MantaThe clutch actuation works without clutch pedal free
travel. A readjustment of the clutch is only required
if the indicator lamp at the instrument panel lights
up.In synchronism with the gradual wear of the clutch
linings the clutch pedal travels from its basic adjust-
ment position upwards,
ie., towards driver. If the
clutch lining wear has reached such an extent that
the clutch pedal rests against switch, the indicator
lamp at the instrument panel lights up.
This is an indication that the clutch pedal position
has to be corrected to ensure proper clutch operat-
ion.
To
&~sure proper clutch operation, observe the fol-
lowing adjustment instructions.. For all adjustment
dimensions, refer to Figure 7A-7.
1. If the parking brake is provided with an indicator
lamp, the parking brake has to be disengaged, other-wise the same indicator lamp as for the clutch lights
UP.2. Carry out adjustment only with ball stud on clutch
housing whereby the distance (Item 20, Figure 7A-7)
between clutch housing contacting surface and
clutch release lever has to be adjusted in the rear to
4
l/4 inches.
Clutch Control Cable Adjustment(Only on
Installation of a New Clutch Disc or
Bowden
Control Wire)
GT1. Adjust ball stud so that outer end protrudes ap-
proximately 3/4 inches out of clutch housing.
2. Adjust distance between release lever and clutch
housing face at eye for control cable to approxi-
mately 4
l/4 inches. See Figure 7A-6. Hold cable in
this position and place E-ring two grooves ahead of
washer on rubber grommet. Clutch pedal free travel
is now between 3/4 and 1
l/4 inches and clutch
release bearing has proper clearance from pressure
plate.
Opel 1900 and Manta1. Adjust ball stud on clutch housing to basic dimen-
sion of approximately 3/4 inch. With lower end ofbowden control wire unhooked, push clutch release
lever towards the front so that the clutch release
bearing rests against clutch spring. Now, adjust ball
stud so that the dimension (Item 20, Figure
7A-7)between clutch housing contacting surface and
clutch release lever amounts in the rear to 4
l/4
inches.2. Pull reattached bowden control wire out of dash
panel so that clutch pedal rests against switch (in-
dicator lamp lights up).
3. In this position, install lockwasher at upper con-
trol wire attachment three grooves towards the front,
thereby completing control wire adjustment.

AUTOMATIC TRANSMISSION 7C- 93
(on Manta models, turn adjuster) until ball end of
cable rests firmly against lever.
2. At this point, measure length of exposed detent
inner cable. Depress accelerator pedal fu/fy, and
again measure inner cable. If correctly adjusted, de-
tent cable should move approximately 3/S inch.
Servicing Selector Lever1. Unscrew console from floor panel, on small con-
sole remove three (3) attaching screws and
on large
console remove four (4) screws. The fourth screw is
accessible after removal of ash tray. See Figure 7C-
88.Figure
7C-88Figure
7C-892. Unplug cigar lighter and lamps from console and
remO”e co”sole.
3. From below vehicle, remove selector rod from
intermediate selector lever.
4. Remove neutral start switch (A) and remove sup-
port housing attaching bolts. See Figure
7C-89.5. Remove support housing and, from the underside
of support housing, remove three (3) support attach-
ing bolts. See Figure
7C-90.Figure
7C-906. Remove intermediate selector lever (B) from shaft
and remove assembly from support housing. See Fig-
ure 7C-92.7GB2
Figure
7C.92

8A-2 1973 OPEL SERVICE MANUAL
HOOD, FENDERS, AND GRILLE
CONTENTS
Subject
DESCRIPTION AND OPERATION:
GTHeadlampOperation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .DIAGNOSIS: (Not Applicable)
MAINTENANCE AND ADJUSTMENTS
GTHeadlampMechanism
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .MAJOR REPAIR:
Removal and Installation
Hood (1900
- Manta). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fender(1900-Manta). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Headlamp Covering (1900
- Manta). . . . . . . . . . . . . . . . . . . . . . . .Headlamp Assembly
(GT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Headlamp
CableAssembly(GT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Grille
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .SPECIFICATIONS: (Not Applicable)
DESCRIPTION AND OPERATION
DESCRIPTION AND OPERATION OF GT
HEADLAMP MECHANISMThe concealed headlamps are moved mechanically.
Pushing actuating lever on left side of console opens
headlamps, pulling lever closes headlamps. Two
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 head-
lamps in closed position the headlamp housing is
flush with front sheet metal.
A white indicator lamp in the instrument panel lights
if the headlamps are not completely opened and
locked. The switches of the headlamp electrical sys-
tem are located behind the left headlamp operating
mechanism.
MAINTENANCE AND ADJUSTMENTS
ADJUSTMENT OF HEADLAMP MECHANISMBoth headlamp assemblies must operate in unison in
order to lock in either the open or closed position.
Page No.
8A-2
8A-2
8A-3
8A-3
8A-4
8A-4
8A-6
8A-61. Adjust headlamps to be parallel in any position by
changing length of right headlamp operating rod.
For adjustment loosen clamp bolt (A). See Figure
8A-1.Figure
8A-l Headlamp Operation Adjustments

8A-61973 OPEL SERVICE MANUAL
9. On installation make sure that the gaps between
headlamp housing in closed position and headlamp
opening is equal all round and housing is flush in its
height with the body.
REMOVAL AND INSTALLATION OF HEADLAMP
CABLE ASSEMBLY
Removal1. Remove cotter pin. See Figure
EA-13 “CL”2. Remove trunion block and nut. See Figure SA-13
“D.”
3. Remove outer adjusting nut and pull cable
through bearing. See Figure 8A-13 “B.”
4. Pull cable through front chassis support.
5. Hoist car.
6. Remove wire clip and unsnap ball seat at control
lever. See Figure 8A-14 “A.”
7. Remove ball-socket and lock nut. See Figure SA-
14
“B.”8. Remove rear adjusting nut. See Figure 8A-14
“CL”9. Remove cable from retainers.
Figure SA-13 Removing Headlamp Trunion Block
Installation10. Thread cable through bearing and clip retainers.Figure 8A-14 Removing Ball Seat at Control Lever
11. Install adjusting lock nut approximately
l/2” on
thread. See Figure 8A-13 “B.’
12. Install lock nut and ball stud on end of cable. See
Figure 8A-14 “B.”
13. Connect ball stud to control lever with clip. See
Figure 8A-14 “A.”
14. Adjust lock nut under vehicle for maximum cable
length. See Figure 8A-14
“CL”15. Thread cable through proper openings in body
and install adjusting lock nut, trunion lock nut, trun-
ion, and lock clip.
16. Adjust cable length for proper headlight operat-
ion.
REMOVAL AND INSTALLATION OF RADIATOR
GRILLE
(GT)
RemovalRemove screws securing grille screen to opening.
InstallationInstall grille screen to opening and secure with
screws.
REMOVAL AND INSTALLATION OF
RADIATOR GRILLE EXTENSIONS
(GTI
Removal
1. Remove hex head screw and washer holding grille
extension to baffle plate.

98-34 1973 OPEL 3ERVlCE MANUAL
9B-23Figure
98.26 Compressor Front and Rear Heads
and circulated through the system via a 3/16 inch
diameter oil passage through the shaft center and
also four 5/64 inch diameter holes drilled perpen-
dicular to the shaft. The inner rotor is driven by the
shaft.TUBE
Figure
98-27 Compressor Oil Flow
4. Shaft and
Gash Plate Assembly - The shaft andwash plate assembly (see Figure 9B-162) consists of
an elliptical plate positioned obliquely to the shaft.
As the plate and shaft rotate, the surface of the plate
moves to and fro lengthwise relative to the centerline
of the shaft. This reciprocating motion is transmitted
to the pistons which contact the surface of the wash
plate. A woodruff key locks the wash plate onto theshaft. The wash plate and shaft are serviced as an
assembly. The shaft is driven by a pulley when the
magnetic clutch is energized. A needle thrust bearing
and
L mainshaft bearing support the shaft horizon-
tally and vertically.
5. Needle Thrust Bearing and Races
- Two needle
thrust bearings, each“sandwiched” between two
races are located on either side of the wash plate
hub. The front needle thrust bearing and races pro-
vide 0.010” to 0.015” clearance between the top of
the pistons and the rear side of the front suction valve
reed disc (see Figure
9B-28). The rear needle thrust
bearings and races provide 0.0005” to 0.0015” clear-
ance between the hub of the wash plate and the rear
hub of the rear cylinder. Races of various thicknesses
are provided for service replacement to achieve re-
quired clearances when rebuilding units.
6. Cylinder Assembly and service Pistons (Factory
installed pistons are ringless) -The cylinder assembly
(front cylinder and rear cylinder) is serviced only as
a matched set. Alignment of the two halves is main-
tained by two dowel (locater) pins.
The double ended pistons are made of cast alumi-
num. There are two grooves on each end of the ser-
vice piston. The outer grooves will receive a piston
ring. The inner grooves act as oil scraper grooves to
collect any excess oil. Two oil return holes are drilled