Specifications (Opel Omega A)

Engine - 2.0 liter models with catalytic converter

Note: If the vehicle is not previously specified as being equipped with a catalytic converter, please refer to the 2.0 litre model information in Section 1.

• Engine code - C20NE
• Compression ratio - 9.2:1
• Maximum power - 115 hp (85 kW), at 5200 rpm
• Maximum torque - 170 Nm, at 2600 rpm

Fuel and exhaust systems - 2.0 litre models from 1990

Note: Unless specifically noted, see 2.0L Specifications in Section 3.

System type - Engine management system Bosch Motronic M1.5

Fuel pump operating pressure (the engine is idling at a constant speed):

Connected vacuum hose of pressure regulator - 1.8 - 2.2 Vag

• Vacuum pressure regulator hose, disconnected and plugged - 2.5-3.0 Vag
• CO content in idle mode (models with catalytic converter) — Less than 0.4%

Tightening torque, Nm

Lambda sensor - 30

Ignition system

Note: Unless changes are specifically noted, see Specifications for Earlier Models in Section 4.

Information taken from the website OPELBOOK.ru

System type:

• Carburettor models 1.8 liter since 1990 - MSTS (Microprocessor ignition timing system)
• 2.0 litre models since 1990 - Bosch Motronic M1.5 engine management system

Automatic transmission - 2.0 liter models from 1990

Note: See Section 6 for information regarding the W 03-71 L transmission fitted to all other models.

Type - GM Powertrain, computerized with three operating modes, four forward speeds and one reverse.

Designation - AR25

Gear ratios:

• 1st place - 2.40:1
• 2nd - 1.48:1
• 3rd - 1.00:1
• 4th - 0.72:1
• Rear - 1.92:1

Lubricant Type/Specification - Dexron II Type ATF (Duckhams Uni-Matic or D-Matic)

Filling capacity (approximately):

• Dry transmission - 6.4 liters
• After removing the large pan - 4.7 liters
• Just drain and add - 2.6 liters

Tightening torques, Nm

• Transmission Pan Bolts - 12
• Drain plug - 25
• Fuel filter bolts - 20
• Inhibitor Switch Bolts - 12
• Drive shaft lever nut - 20
• Transmission-engine bolts - 45
• Torque Converter-Drive Disc Bolts - 30
• Rear crossmember bolts - 45

Main gear and drive shafts

Note: Unless changes are specifically noted, see Specifications in Section 8.

Final drive ratio:

• 1.8 models with automatic transmission - 3.90:1
• 2.0L models with catalytic converter - 3.90:1

Main gear lubricant filling capacity for modified rear cover model - See text

Brake system

Note: Unless changes are specifically noted, see Specifications in Section 9.

Tightening torques, Nm

Caliper Guide Pin Bolt(aTE support) — 30

Caliper hanger mounting bolts - steering knuckle:

• Stage 1 - 95
• Stage 2 - Tighten to an angle of 30-45°

Bolt connecting the high-pressure brake line tube to the caliper - 40

Suspension and steering

Note: Unless changes are specifically noted, see Specifications in Section 10.

Wheel diameters:

• Later models with low specification - 6J x 15
• Later models with high specification - 6J x 15 or 7J x 15*

* These models have a 6J x 15 emergency spare tire that should only be used in an emergency

Tire sizes - 195/65 HR 15 or 195/65 VR 15 (depending on the model)