Target Audience:
BMW E21 owners (DIY enthusiasts), independent auto repair professionals, dealerships.
Advantage:
Vehicle-specific, dealer-level procedures, comprehensive coverage, original manufacturer information.
Information Source:
Written by the manufacturer (BMW).
Usability:
Clear, concise text with illustrations for easy understanding, even for those with basic mechanical skills.
Cost Savings:
Enables DIY repairs, saving significant money on routine maintenance and repairs.
Engine Mechanical:
Complete overhaul, component testing, torque specifications, timing.
Engine Electrical:
Ignition system, starting system, charging system, diagnostics.
Emission Control:
Components, adjustments, diagnostic procedures for emissions systems.
Fuel System:
Carburetor(s) (e.g., Solex, Zenith), fuel injection (if applicable for model year), fuel pump, lines.
Clutch System:
Clutch disc, pressure plate, release bearing, hydraulic system, adjustments.
Manual Transaxle:
Gearbox disassembly, assembly, component replacement, fluid specifications.
Automatic Transaxle:
Transmission operation, fluid type, basic troubleshooting, adjustments.
Driveshaft Axle:
U-joints, driveshaft balance, axle shafts, differential.
Suspension:
Front and rear suspension, struts, shock absorbers, bushings, springs, alignment.
Steering:
Steering box, tie rods, steering column, power steering (if equipped), adjustments.
Restraint System:
Seat belts, anchorage points, basic inspection.
Brake System:
Hydraulic system, brake pads/shoes, rotors/drums, parking brake, bleeding procedures.
Body Interior Exterior:
Body panel removal/installation, interior trim, glass replacement, door mechanisms.
Body Electrical:
Lighting, instrumentation, wipers, horn, power accessories, wiring diagrams.
HVAC:
Heating system, ventilation, air conditioning system (if equipped), component replacement.
Maintenance:
Oil changes, filter replacements, spark plug service, fluid checks, lubrication.
Troubleshooting:
Diagnostic charts, symptom-based issue resolution.
Repair:
Step-by-step instructions for component removal, repair, and reinstallation.
Diagnostics:
Electrical system diagnostics, mechanical system checks.
Depth:
Comprehensive; suitable for basic owner maintenance to advanced professional repair.
Content Type:
Step-by-step instructions, diagrams, illustrations, wiring schematics, specifications.
Engine Family:
BMW M10 (Four-cylinder inline)
Typical Displacement 1975:
1.8L (1766cc) and 2.0L (1990cc) - Specific to model variants (e.g., 316, 318, 320).
Typical Horsepower 1.8L:
~90 PS (66 kW; 89 bhp) - Variant dependent.
Typical Horsepower 2.0L:
~105-115 PS (77-85 kW; 104-113 bhp) - Variant dependent.
Fuel Delivery:
Typically downdraft Solex carburetors (e.g., 316, 318) or Zenith carburetors (e.g., 320i may have Kugelfischer mechanical injection).
Oil Change Interval:
Typically 7,500 - 10,000 miles (12,000 - 16,000 km) or 12 months, depending on driving conditions and oil type used.
Spark Plug Replacement:
Approximately 20,000 - 30,000 miles (32,000 - 48,000 km).
Timing Belt Chain:
M10 engines use a timing chain, which is generally designed for the life of the engine, but inspection for wear and tension is recommended.
Engine Oil:
API SG or SH, SAE 10W-40 or 10W-50 (check manual for specific viscosity recommendations based on temperature).
Coolant:
50/50 mix of ethylene glycol-based antifreeze and distilled water.
Brake Fluid:
DOT 3 or DOT 4.
Transmission Fluid Manual:
GL-4 gear oil (e.g., SAE 75W-90 or 80W-90).
Transmission Fluid Automatic:
Dexron-III or equivalent ATF (Automatic Transmission Fluid).
Rust Corrosion:
Common in wheel arches, rocker panels, and underbody due to age and materials used in manufacturing.
Electrical Gremlins:
Aging wiring harnesses, corroded connectors, and failing relays can cause intermittent electrical issues.
Carburetor Issues:
Wear and tear on carburetor components can lead to tuning difficulties, fuel leaks, or poor running conditions.
