🏷️ Basic Information Identification Make: BMW Model: 3 Series Chassis Code: E21 Model Years: 1975-1983 Codes Engine Codes Covered: M10 (e.g., M10B18, M10B20, M10B23), M21 (Diesel, for later E21 models, though primarily M10 focus for early '75 production) Transmission Codes Covered: Getrag 4-speed, Getrag 5-speed (e.g., 245, 260) 👋 Introduction Market Position Market Position: The BMW E21 represented BMW's entry into the compact executive sedan segment, establishing the iconic 3 Series lineage. This manual targets owners and technicians seeking to maintain and repair these historically significant vehicles. Competitive Analysis Competitive Analysis: Competed with vehicles like the Mercedes-Benz W123, Audi 80, and Alfa Romeo Alfetta. The E21 was lauded for its sporty handling and premium feel, setting a benchmark for its class. Key Features Key Features: The manual is presented as the 'Best Manual Available' on Tradebit, emphasizing completeness, no missing pages, and customer satisfaction. It highlights its suitability for DIY repairs, refurbishment, and restoration, offering a complete resource for all aspects of the E21. Target Audience Target Audience: Enthusiasts, DIY mechanics, and professional repair shops working on BMW E21 models. Emphasis on empowering owners to perform maintenance and repairs themselves. 📋 Manual Details Coverage Areas Coverage Areas: North America, Europe, Global Page Count Page Count: Hundreds (Exact number not specified, but indicates comprehensive nature) Manual Type Manual Type: Service Repair Workshop Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Systems Covered: Engine, Fuel System, Cooling System, Exhaust System, Ignition System, Clutch, Transmission (Manual), Drivetrain, Suspension (Front & Rear), Steering, Brakes (Front Disc, Rear Drum/Disc), Electrical System (Wiring Diagrams, Lighting, Accessories), Bodywork, Interior Components, HVAC System, Body Electrical, Diagnosis & Troubleshooting Electrical System Details: Comprehensive wiring diagrams for all major electrical components, including lighting circuits (headlights, taillights, turn signals), instrument cluster, ignition system wiring, starter circuit, charging system, and accessory circuits. Troubleshooting for common electrical faults. Procedures Included Procedures Included: Routine Maintenance, Scheduled Servicing, Engine Overhaul & Rebuild, Fuel System Diagnosis & Repair, Ignition System Tuning, Transmission Removal & Installation, Clutch Replacement, Suspension Component Replacement, Brake System Servicing, Electrical Troubleshooting, Body Panel Repair, Interior Trim Removal & Installation, HVAC System Servicing, Diagnostic Procedures, Component Testing, Torque Specifications, Alignment Procedures Bodywork Procedures: Includes procedures for body panel alignment, rust repair techniques, welding specifications, door and window seal replacement, bumper removal and installation, and internal chassis reinforcement details. Technical Depth Technical Depth: Comprehensive: From basic oil changes and tune-ups to complete engine and transmission rebuilds, advanced electrical diagnostics, and bodywork restoration. Covers all aspects necessary for DIY repair and professional servicing. Diagnostic Tools: While not detailing modern OBD scanners, the manual covers the use of basic diagnostic tools such as multimeters, timing lights, compression testers, and fuel pressure gauges for troubleshooting. 📊 Manual Specifications File Format File Format: PDF Searchability: PDF format typically allows for text searching, enabling quick access to specific information. Manual implies a well-organized table of contents for navigation. Print Quality Print Quality: High-resolution digital scans, suitable for printing clear, legible pages. Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) Completeness Completeness: Claimed 'Complete Manual - No Missing Pages'. Covers all models and systems within the E21 range. ⚙️ Engine Specifications Primary Engine Primary Engine: BMW M10 inline-four cylinder petrol engine. Available in various displacements: 1.8L (M10B18), 2.0L (M10B20), and 2.3L (M10B23). Performance Performance: Early models (e.g., 316, 318) featured around 90-105 hp. Later models and performance variants (e.g., 320i, 323i) offered 100-145 hp, with excellent power-to-weight ratios and responsive acceleration for the era. Engine Variants Power Torque: 316 (1.8L): ~90 hp; 318 (1.8L): ~98 hp; 320 (2.0L Carb): ~109 hp; 320i (2.0L EFI): ~115 hp; 323i (2.3L EFI): ~143 hp. Torque figures vary accordingly. Manual provides exact specifications for each. Fuel System Fuel System: Carburetor (e.g., Solex Zenith, SU) for base models; Bosch K-Jetronic mechanical fuel injection for 'i' models. The manual covers diagnosis and repair for both systems. Engine Maintenance Engine Maintenance: Includes procedures for valve adjustment, ignition timing, carburetor adjustment/rebuild, fuel injection system servicing, spark plug replacement, and engine compression testing. Engine Cooling Engine Cooling: Pressurized coolant system with belt-driven water pump and radiator. Manual details radiator, thermostat, hoses, and coolant specifications. Engine Codes Detail Engine Codes Detail: Details specific variants such as the M10B18 (1.8L), M10B20 (2.0L, including 320i with fuel injection), and M10B23 (2.3L, used in 323i). Covers differences in compression ratios, camshafts, and fuel delivery systems for each. 🔧 Transmission Standard Standard Transmission: Getrag 4-speed manual transmission. Optional Optional Transmission: Getrag 5-speed manual transmission (introduced later); ZF 3-speed automatic transmission. Features Transmission Features: Rear-wheel drive, robust and reliable transmissions. Manual covers clutch replacement, gearbox overhaul, driveshaft and universal joint servicing, and differential maintenance. 📐 Dimensions Exterior Exterior Dimensions: Compact executive sedan dimensions. Length: ~4360 mm, Width: ~1630 mm, Height: ~1380 mm. Wheelbase: ~2560...