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AUTOMATIC TRANSMISSION
VACUUM MODULATOR
Figure
Vacuum Modulator and Modulator Valve
decrease as car speed increases. For this reason, gov-
ernor pressure (which is a function of car speed) is
directed to the area between the two different diame-
ter spools at the outboard end of the valve. As gover-
nor pressure increases, it creates an outward force on
the modulator valve and in effect reduces the spring
force of the modulator assembly.
The modulator assembly consists of two chambers
separated by a diaphragm. The chamber toward the
valve is open to atmosphere and the other chamber
is connected to engine vacuum. The
cham-
ber also contains a spring. When there is no
of mercury), the full spring force bears against
the diaphragm and is transmitted to the valve
through a plunger. This is the spring force which
establishes the regulated pressure of the modulator
valve. As the vacuum in the outer chamber increases,
an outward force is created on the diaphragm which
cancels
some of the spring force. This continues
up to
of vacuum, at which point the diaphragm
force cancels out the spring force and the modulator
pressure becomes zero.
In summary, the following indicates the function of
the total modulator system in combination with the
pressure regulator system.
In addition, higher car speeds will produce a some-
what lower modulator and line pressure for any
given vacuum by virtue of the governor pressure
acting on the modulator valve.
Engine
Torque
Low
High
Vacuum
High
L o w
Modulator
L o w
High
Line
LOW
High
Modulator pressure is then directed to:
Pressure regulator boost valve.
control.
2
control valve by way of the 3 2 control
valve.
Detent Valve.
2 Accumulator
Low Speed Downshift Timing Valve.
Detent Pressure Regulator Valve
The regulating action of the Detent Pressure Regula-
tor Valve is essentially the same as for the Modulator
Valve, except that it regulates a constant pressure.
See Figure
The feed port, regulating port and
exhaust port all function in the same manner as the
Modulator Valve. Since the force set up by the pres-
sure in the regulating port acts only against a
spring force, the resulting detent pressure is con-
stant. The detent regulator pressure is directed to the
Detent Valve and to the Manual Low and Reverse
Control Valve.
D E T .
Figure
Detent Pressure Regulator Valve
l-2 Accumulator Valve
The 2 Accumulator Valve, Figure
is used
to establish a desired pressure to ultimately control
the rate of apply of the second clutch during a to
2 upshift. Here again, the regulating action is essen-
tially the same as for the Modulator Valve or Detent
Pressure Regulator Valve.
Summary of Contents for 1900 1973
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Page 48: ...IGNITION SYSTEM lC 27 9 3OlC19 Figure 1 C l 3 Distributor Exploded...
Page 57: ...I I 1 D 36 1973 OPEL SERVICE MANUAL I Figure 1 D 27 Alternator Exploded View 301D27...
Page 95: ...j 1J 74 1973 OPEL SERVICE MANUAL i I m Figure 13 1 Windshield Wiper and Horn Opel 1900 Manta...
Page 96: ...I I WIRING DIAGRAMS lJ 75 Figure lJ 2 Windshield Wiper and Horn Rallye...
Page 97: ...1 J 76 1973 OPEL SERVICE IMANUAL L J Figure lJ 3 Wind hield Wiper and Horn Gl...
Page 98: ...I I I WIRING DIAGRAMS 1J 77 I I Figure 1 J 4 Turn Signal and Hazard Flasher Opel 1900 Manta I...
Page 99: ...I i L I lJ 78 1873 OPEL SERVICE MANUAL Figure lJ 5 Turn Signal and Hazard Flasher GT...
Page 100: ...I WIRING DIAGRAMS 15 79 I I Figure lJ 6 Oil Fuel Temp Tach Stop and Brake Warning Light GT I...
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Page 102: ...I WIRING DIAGRAMS lJ 81 r Figure 1 J 8 Blower and Lighter GT...
Page 103: ...I I lJ 82 1973 OPEL SERVICE MANUAL Figure lJ 9 indicator Lights and Gauges Opel 1900 Manta...
Page 104: ...I I WIRING DIAGRAMS IJ 83 I Figure 1 J 10 Indicator Lights and Gauges Ratlye...
Page 106: ...EhMB SWITCH R GHiDOOR 301J12...
Page 107: ...1 J 86 1973 OPEL SERVICE MANUAL i Figure 1 J l 3 Headlamps Opel 1900...
Page 108: ...I I I WIRING DIAGRAMS lJ 87 Figure lJ 14 Headlamps Manta...
Page 109: ...1 J 88 1973 OPEL SERVICE MANUAL I 1 Figure lJ 15 Headlamp and Fog Lights Rallye...
Page 110: ...301516...
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Page 113: ...1 J 92 1973 OPEL SERVICE MANUAL d 5 Figure 1 19 Starting lgniiion and Charging Opel 1900 Manta...
Page 114: ...I I WIRING DIAGRAMS lJ 93 I Figure lJ 20 Starting Ignition and Charging GT...
Page 115: ...1 J 94 1973 OPEL SERVICE MANUAL i I I Figure lJ 21 Instrument Panel GT...
Page 116: ...I I 1 I WIRING DIAGRAMS lJ 95 Figure lJ 22 A C Generator and Regulator All Models...
Page 117: ...301523...
Page 119: ...I I I 10 RED AMP GAGE 301J25...
Page 120: ...WIRING DIAGRAMS lJ 99 Figure lJ 26 Seat Belt Warning System Automatic Transmissionl GT...
Page 121: ...lJ 100 1973 OPEL SERVICES MANUAL I Figure 1 J 27 Heated Rear Glass Opel 1900 Manta...
Page 122: ...I WIRING DIAGRAMS 1 J 101...
Page 123: ...1 J 102 1973 OPEL 9ER IC MANUAL...
Page 128: ...SPECIAL BODY TOOLS GENERAL INFORMATION 2A 5 W REGULATOR INING INSTALLER J 21828 J 21549 2A 1...
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Page 285: ...5C 26 1973 OPEL SERVICE MANUAL...
Page 322: ...ENGINE MECHANICAL AND MOUNTS 6A 31...
Page 350: ...CARBURETOR AND THROTTLE LINKAGE 6E 59 Figure 6E 37 Carburetor Specifications...
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Page 372: ...Figure 7A 9 Exploded View of Clutch Pedal and Housing...
Page 423: ...Third Clutch Applied Low Band Released...
Page 424: ...AUTOMATIC TRANSMISSION C 63...
Page 425: ...712 64 1973 OPEL SERVICE MANUAL HYDRAULIC OPERATION I r n...
Page 427: ...7C 66 1973 OPEL SERVICE MANUAL...
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Page 429: ...7C 68 1973 OPEL SERVICE MANUAL II II I...
Page 431: ...7C 70 1973 OPEL SERVICE MANUAL d...
Page 433: ...7C 72 1973 OPEL SERVICE MANUAL...
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Page 437: ...712 76 1973 OPEL SERVICE MANUAL...
Page 439: ...a 1973 OPEL SERVICE MANUAL...
Page 441: ...7C 80 1973 OPEL SERVICE MANUAL...
Page 499: ...7C 138 1973 OPEL SERVICE MANUAL 4 5 I Figure 7C 234 Special Tools Automatic Transmission 7C223...
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Page 596: ...98 88 1973 OPEL SERVICE MANUAL Figure gB 165 Special Tools...
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