Engine Mechanical:
Detailed procedures for engine disassembly, inspection, reassembly, timing, lubrication, and cooling systems. Includes cylinder head, pistons, crankshaft, camshaft, valves, oil pump, water pump.
Engine Electrical:
Coverage of ignition system, starting system, charging system (alternator, starter motor, battery), lighting, instrumentation, and wiring diagrams.
Emission Control:
Information on emission control devices, systems, and troubleshooting specific to the 1978 model year compliance requirements.
Fuel System:
Comprehensive details on fuel delivery, carburetors (likely Solex or Zenith), fuel pumps, fuel lines, fuel tank, and related components.
Clutch System:
Repair and adjustment procedures for the clutch assembly, including clutch disc, pressure plate, release bearing, and clutch hydraulics.
Transmission:
Detailed instructions for both manual transaxles (e.g., 4-speed, 5-speed) and automatic transaxles, including disassembly, assembly, and service specifications.
Drivetrain:
Coverage of driveshafts, CV joints, differential, and axles for front-wheel-drive configurations.
Suspension:
Front and rear suspension components, including McPherson struts, control arms, springs, shock absorbers, bushings, and alignment specifications.
Steering:
Procedures for steering system maintenance, repair, and troubleshooting, likely including power steering components if equipped.
Brakes:
Detailed information on hydraulic brake systems, including front disc brakes, rear drum brakes, master cylinder, brake lines, calipers, pads, and shoes. Includes bleeding procedures and specifications.
Body Interior:
Repair and maintenance of interior components, upholstery, dashboard, door panels, and trim.
Body Exterior:
Procedures for body panel repair, doors, hood, trunk, bumpers, glass replacement, and exterior trim.
Body Electrical:
Wiring diagrams for all body electrical functions, including lighting, wipers, horn, power windows (if applicable), and interior accessories.
HVAC:
Information on heating, ventilation, and air conditioning systems, including components, operation, and servicing.
Maintenance Tasks:
Scheduled maintenance, oil changes, filter replacements, fluid checks and changes, spark plug replacement, belt adjustments, brake adjustments.
Diagnostic Procedures:
Troubleshooting guides, symptom-based diagnostics, electrical system diagnostics using wiring diagrams, engine performance analysis.
Repair Procedures:
Step-by-step instructions for component removal, repair, and installation for all major vehicle systems.
Rebuild Procedures:
Detailed instructions for overhauling engines, transmissions, and other major components.
Depth Of Coverage:
Highly detailed, covering everything from basic maintenance to complex engine and transmission rebuilds, suitable for professional mechanics and advanced DIY enthusiasts.
Engine Options:
Likely covers the 5-cylinder inline engines (e.g., 2.0L, 2.1L, 2.2L) that powered the Audi 100/200 series in this era, and potentially earlier 4-cylinder variants if applicable to the 1978 model.
Horsepower Range:
Typical for the era, engines would range from approximately 100 hp to 130 hp, with turbocharged '200' models offering higher outputs (e.g., 170 hp).
Torque Range:
Estimated torque figures would be in the range of 115-150 lb-ft, varying with engine size and aspiration.
Carburetor Types:
Commonly equipped with single or dual-barrel carburetors from manufacturers like Solex or Zenith.
Fuel Injection:
Some higher-spec models or later variants might have featured Bosch K-Jetronic or similar mechanical fuel injection systems.
Oil Change Interval:
Typically every 3,000-5,000 miles (5,000-8,000 km) or 6-12 months, depending on driving conditions. Manual will specify exact intervals and oil types.
Tune Up Interval:
Spark plugs, distributor cap/rotor, and ignition timing checks usually recommended every 12,000-24,000 miles (20,000-30,000 km).
Engine Oil Type:
Typically SAE 10W-40 or 20W-50 for gasoline engines of this era, with API SF or SG service classification. Manual will specify exact viscosity and API rating.
Coolant Type:
A 50/50 mix of ethylene glycol-based antifreeze and distilled water. Manual will specify specific coolant type and capacity.
Transmission Fluid:
For manual: GL-4 gear oil. For automatic: DEXRON II or equivalent. Manual will specify exact type and capacity.
Common Wear Items:
Timing belts (if applicable, though 5-cylinders often used chains or were non-interference), CV joints, suspension bushings, exhaust systems, and brake components are common wear items.
Electrical Gremlins:
Aging wiring harnesses, connectors, and relays can lead to intermittent electrical issues typical of vehicles from this era. The wiring schematics are crucial here.
