🏷️ Basic Information Identification Make: BMW Model: 3 Series (E21) Variant: 315, 320i, 323i Chassis Code: E21 👋 Introduction Market Position Target Audience: Do-it-yourself enthusiasts and professional mechanics seeking detailed information for the BMW E21 generation. Key Features Value Proposition: Inexpensive way to keep your vehicle working properly, guides through every service and repair procedure with hundreds of photos and illustrations. Unique Selling Points Content Depth: Detailed illustrations, exploded diagrams, drawings, and photos, step-by-step instructions based on complete disassembly. 📋 Manual Details Coverage Areas Coverage Scope: Complete Official Service and Repair Manual for BMW 315, 320i, and 323i (E21) models and all engines. Page Count Estimated Page Count: Hundreds of pages (specific number not provided in product info, but implied by detailed coverage) Manual Type Type: Official Service and Repair Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine: Engine Overhaul and Rebuilding, Engine Performance, Firing Orders, Serpentine Belt Routings, Timing Belt Service Procedures. Brakes: Brakes, Brake Servicing Procedures, Complete Torque Specifications (for brake components). Suspension Steering: Front End and Alignment Procedures and Specifications, Suspension, U-Joint and CV-Joint Service Procedures. Electrical Electronics: Wiring Diagrams, Computer Diagnostic Trouble Tree Charts, Computer Diagnostic Codes. Drivetrain: Transmission Removal and Installation, Transmission In-Car Servicing. Body Chassis: Sunroof. HVAC: Air Conditioning Service and Capacities. Fuel System: Fuel system details implied within engine overhaul and performance sections. Cooling System: Covers radiator, water pump, thermostat, hoses, and heater core service. Exhaust System: Details on exhaust manifold, catalytic converter (if applicable), mufflers, and pipes. Interior Trim: Procedures for removal and installation of interior components, seats, dashboard, etc., are likely included for access to underlying systems. Body Panels: Covers repair and adjustment of body panels, doors, hoods, and trunk lids. Procedures Included Maintenance: Factory Maintenance Schedules and Charts, Routine Maintenance Procedures. Repair Rebuilding: Engine Overhaul and Rebuilding, Complete Repair Procedures, Step-by-step instructions for disassembly and reassembly. Diagnostics Troubleshooting: Trouble Codes, Troubleshooting and Diagnostics, Computer Diagnostic Trouble Tree Charts, Driving Concerns. Special Procedures: Timing Belt Replacement, Timing Belt Service Procedures, Serpentine Belt Routings with Diagrams. Electrical Troubleshooting: Detailed wiring diagrams and troubleshooting charts for all electrical systems, including lighting, ignition, and accessories. Technical Depth Depth: Comprehensive: Covers everything needed to repair, maintain, rebuild, refurbish, or restore the car. Suitable for DIYers and experienced mechanics. Data Accuracy Accuracy Level: Factory-level accuracy and detail, based on original BMW documentation. 📊 Manual Specifications File Format Format: PDF File Quality Quality: High Quality, Complete and Intact, No Missing/Corrupt pages/sections, Searchable Text, Bookmarked. Print Capabilities Printability: Fully Printable, Printable pages as needed. Accessibility Zoom Functionality: Zoom In/Out Capability. Compatibility Operating Systems: All Versions of Windows & Mac. Delivery Method: Instant Download. ⚙️ Engine Specifications Primary Engine Engine Family: BMW M10 (Inline-4) and M20 (Inline-6) variants. Performance Engine 315: Details for the 315 engine (likely a variant of the M10, e.g., 1.6L or 1.8L) are covered, though specific output figures aren't listed in the product description. Engine 320I: Details for the 320i engine (likely a 2.0L M10 or early M20 variant) are covered. Engine 323I: Details for the 323i engine (typically a 2.3L M20 inline-6) are covered, including specific performance figures if provided in the manual. Fuel System Fuel Injection: Covers fuel injection systems relevant to the 320i and 323i models (e.g., Bosch L-Jetronic or K-Jetronic). Technical Details Carburetion: May cover carburetor setups for specific 315 or early 320i models, depending on market and specification. Engine Displacement Options: Covered displacements include approximately 1.6L, 1.8L, 2.0L, and 2.3L, depending on the specific 315, 320i, and 323i models. 🔧 Transmission Standard Gearbox Options: Likely covers both manual and automatic transmission options available for the E21 generation. Features Clutch Service: Procedures for clutch service and replacement are typically included in transmission repair manuals. 📐 Dimensions Exterior Chassis Type: Monocoque chassis with MacPherson front struts and semi-trailing arm rear suspension. Wheelbase: Approximately 2,630 mm (103.5 inches). Length: Approximately 4,360 mm (171.7 inches). Width: Approximately 1,610 mm (63.4 inches). Height: Approximately 1,380 mm (54.3 inches). Weights Curb Weight Range: Varies by engine and equipment, typically between 1100-1300 kg (2425-2866 lbs) for the E21 generation. 🛡️ Safety Features Passive Features Safety Structure: E21 chassis incorporated significant safety advancements for its time, including a safety-cell design. Active Features Braking System: Front disc brakes, rear drum brakes common; higher performance models might have rear discs. Manual covers all service. 💡 Technology Features Infotainment Audio Systems: Basic factory radio and speaker systems typical for the era. Manual will cover installation and troubleshooting. Driver Assistance ABS: ABS was not standard or widely available on early E21 models; if fitted, the manual would cover its service. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 5,000-7,500 miles or 6-12 months, depending on driving conditions and oil type. Specifics will be in the manual. Fluid Specifications Engine Oil Type: Manual will specify appropriate API...