Opel Manta A 1970-1975 Workshop Service Repair Manual

Step by Step detailed repair, service, and electrical systems Instructions – This is the Official Workshop Manual published by Opel for the Manta A. It includes complete coverage for all Manta A models from 1970 to 1975, providing comprehensive service information used by Opel dealership technicians.

Official Workshop manual used by Opel Approved Garages

Models: Opel Manta A (1970-1975) – 498,553 units produced worldwide. Includes Sport Coupe, Rallye, Luxus, Berlinetta, and GT/E variants. Also covers US market vehicles sold as “1900 Sport Coupe” (1971-1972) before the Manta nameplate was added in 1973.

Engines:
1.9L CIH 4-Cylinder (90hp @ 5100rpm) 1970-1975 European
1.9L CIH 4-Cylinder (75hp @ 4800rpm) 1973-1974 US Emissions Spec
1.9L CIH Fuel Injected (105hp @ 5400rpm) 1974-1975 GT/E
1.6L CIH 4-Cylinder (68hp @ 5400rpm) 1970-1975

Transmissions: 4-Speed Manual (fully synchronized), GM TH-180 3-Speed Automatic

Left and Right hand drive covered

Years: 1970, 1971, 1972, 1973, 1974, 1975

Language: English
Format: PDF
Compatibility: Windows / Mac / Linux / Tablet / Mobile

CONTENTS
General Information: Vehicle identification, lifting points, towing procedures, specifications. Maintenance: Service schedules, fluid capacities, lubrication points. Engine Mechanical: Cylinder head reconditioning, valve adjustments, camshaft timing, CIH engine rebuilding, pistons, crankshaft, oil pump. Engine Electrical: Starting system, charging system, ignition timing. Emission Control: PCV system, EGR valve, evaporative controls, US emissions equipment. Fuel System: Solex carburetor adjustments, Bosch L-Jetronic fuel injection servicing, fuel pump, tank and lines. Clutch & Transmission: Clutch replacement and adjustment, manual gearbox overhaul, synchronizer replacement, automatic transmission servicing and band adjustments. Propeller Shaft & Differential: Universal joint rebuilding, rear axle differential overhaul. Steering: Steering gear adjustments, rack service, alignment specifications. Suspension: Front MacPherson strut replacement, rear suspension repairs, geometry settings. Brakes: Disc brake pad replacement, drum brake service, system bleeding, master cylinder, parking brake. Body & Chassis: Panel alignment, rust repair procedures, trim removal. Electrical Systems: Dashboard instrumentation, lighting circuits, heating and ventilation. Wiring Diagrams: Complete color-coded diagrams for all model years including US and European specifications.

Special Features:

• Complete wiring diagrams for Sport Coupe, Rallye, Luxus, and GT/E variants
• US and European specification differences clearly documented
• Bosch L-Jetronic fuel injection system diagnosis (1975 US models)
• Rallye model fog lamp installation and gauge cluster procedures
• 5 mph bumper mounting and alignment (1974-1975 US models)
• Same factory manual used by Buick dealerships for US market service

Instant Download

Frequently Asked Questions

What Opel Manta models are covered in this workshop manual?
This manual covers all Opel Manta A (First Generation) variants produced from 1970 to 1975, including the Sport Coupe, Rallye, Luxus, Berlinetta, and GT/E models. It also covers vehicles sold in the US market as the “1900 Sport Coupe” during 1971-1972 before the Manta nameplate was added in 1973.

What engines and transmissions are covered?
Engine coverage includes the 1.9L CIH producing 90hp (European spec), the 1.9L CIH producing 75hp (US spec 1973-1974), the 1.9L fuel-injected engine producing 105hp (GT/E and 1975 US models), and the 1.6L CIH producing 68hp. Transmission coverage includes the 4-speed manual gearbox and 3-speed TH-180 automatic.

Does this manual include wiring diagrams for the Opel Manta?
Yes, this workshop manual contains complete wiring diagrams for all Manta A model years and variants. This includes electrical schematics for the Rallye model with its additional gauge cluster and fog lamps, lighting circuits, starting and charging systems, and the Bosch L-Jetronic fuel injection system fitted to 1975 US models and GT/E variants.

Does this cover both US and European Manta specifications?
Yes, this manual covers both US and European market Manta A models. Key differences documented include the US-spec heavy-duty cooling system, emissions equipment that reduced power from 90hp to 75hp for 1973-1974 models, the Bosch L-Jetronic fuel injection standard on all 1975 US Mantas, and the 5 mph aluminum bumpers fitted to 1974-1975 US models to meet federal crash standards.

What format is this Workshop Manual provided in?
IMPORTANT: This is a PDF manual – a professional OEM Opel workshop format. The PDF runs on all compatible devices and provides dynamic access to repair procedures, technical specifications, torque values, and service instructions with professional-grade functionality for extensive troubleshooting and repairs.