🏷️ Basic Information

Make:

BMW

Model:

315 / 316

Chassis Code:

E21

Generation:

First Generation 3 Series (E21)

Production Years:

1977-1983

👋 Introduction

Market Position:

Targets BMW E21 owners and independent workshops seeking detailed, factory-level repair and maintenance information. Positioned as a comprehensive resource for both DIY enthusiasts and professional mechanics.

Target Audience:

Enthusiasts aiming for self-sufficiency in vehicle maintenance and repair, or those who wish to understand and oversee professional service.

Competitive Analysis:

Offers equivalent information to authorized BMW dealer service manuals, providing a cost-effective alternative for maintenance and repair documentation. Its digital format offers convenience and accessibility.

Key Features:

Instant download, comprehensive coverage, detailed diagnostics and troubleshooting, practical solutions with drawings, technical specifications, torque settings, wiring diagrams, and advice for interacting with professional mechanics.

📋 Manual Details

Coverage Areas:

Comprehensive repair and service for BMW E21 315 and 316 models, covering all major mechanical and electrical systems.

Page Count:

Not specified in product information, but described as comprehensive.

Manual Type:

Repair Service Manual

Language:

German

Format:

PDF (Digital Download)

Viewing Devices:

Viewable on PCs, Macs, and various devices including many phones and ebook readers like Amazon Kindle.

📖 Manual Coverage

Systems Covered:

General Information, Engine Service and Overhauling, Transmission, Chassis, Body, Wiring, Fuel System, Emission Control, Induction, Mechanical Components, Control Systems, Transmission and Differentials, Steering and Suspension, Brakes, ABS (if applicable to specific E21 variants).

Fuel System Details:

Carburetor adjustment, fuel pump testing, fuel filter replacement, fuel line routing and inspection.

Emission Control Details:

Information on emission control components relevant to the E21 models, including EGR systems (if fitted) and catalytic converters (on later models).

Wiring Coverage:

Detailed wiring diagrams, electrical component locations, pin-out data, and expected voltage readings for troubleshooting.

Procedures Included:

Diagnosis of engine fault symptoms, repair approach evaluation, part testing techniques, wiring diagram tracing, engine management system analysis, common fixes, pre-emptive maintenance tips, post-repair verification.

Engine Overhauling:

Detailed instructions for engine disassembly, component inspection, measurement, rebuilding, and reassembly, including piston ring replacement, valve adjustments, and gasket replacements.

Transmission Repair:

Procedures for clutch replacement, transmission fluid changes, and internal transmission component inspection and repair for both manual and automatic gearboxes.

Brake System Service:

Disc brake pad and rotor replacement, brake caliper servicing, brake fluid bleeding, brake line inspection, and drum brake adjustment (if applicable).

Steering And Suspension:

Detailed procedures for steering rack inspection and repair, power steering system service, shock absorber replacement, spring replacement, and wheel alignment adjustments.

Body And Chassis:

Information on body panel repairs, door mechanism adjustments, window operation, and chassis component inspections.

Recalibration Procedures:

Procedures for recalibrating engine control units (if applicable for later models) and other electronic modules.

Preventative Maintenance:

Guidance on checking and maintaining components before they fail, such as coolant hoses, belts, and vacuum lines.

Technical Depth:

Suitable for owners with basic mechanical skills and independent auto service professionals. Includes specifications and procedures equivalent to authorized dealer service departments, covering everything from basic maintenance to in-depth overhauling and diagnostics.

Torque Settings:

Provides comprehensive torque specifications for critical fasteners throughout the vehicle, ensuring proper assembly and preventing damage.

Troubleshooting Methodology:

Structured approach to diagnosing common and complex problems, with flowcharts and diagnostic trees to guide the technician.

Diagnostic Techniques:

Provides guidance on 'secret techniques used by top mechanics' for diagnosing issues, implying advanced diagnostic strategies.

Part Number Reference:

While not explicitly stated as a parts catalog, the level of detail often implies references to component part numbers for replacement.

📊 Manual Specifications

File Format:

PDF

Print Quality:

Printable pages, allowing users to print sections as needed to keep the original clean.

Binding Type:

N/A (Digital format, printable)

Paper Type:

N/A (Digital format, printable)

⚙️ Engine Specifications

Engine Options:

1.6L and 1.8L inline-four cylinder engines.

Engine Displacement 315:

Approximately 1.6 Liters (M10 variant, likely M10B16 or similar).

Engine Displacement 316:

Approximately 1.8 Liters (M10 variant, likely M10B18 or similar).

Engine Power Output Typical 1.6L:

Approximately 75-90 hp (may vary based on specific variant and market).

Engine Power Output Typical 1.8L:

Approximately 90-105 hp (may vary based on specific variant and market).

Fuel Delivery:

Carburetor-based fuel delivery (e.g., Solex, Zenith) for most E21 variants. Injection systems (Bosch L-Jetronic) may be present on later or specific models.

Carburetor Models:

May detail Solex 32/32 DIDTA, Zenith Stromberg, or other relevant carburetor types.

Ignition System:

Details on distributor, ignition coil, spark plugs, and timing adjustments.

Induction System:

Naturally aspirated, intake manifold and exhaust system details covered.

🔧 Transmission

Transmission Types:

Typically 4-speed or 5-speed manual transmissions. Automatic transmission options were also available.

Optional Transmission:

Automatic transmission (e.g., ZF 3HP18 or similar).

Differential Coverage:

Includes coverage of differentials, clutch operation, and driveshafts.

Clutch Operation:

Information on clutch assembly, adjustment, and hydraulic system maintenance.

📐 Dimensions

Body Styles:

Primarily 2-door sedan (coupe), with some markets receiving a convertible variant later in production.

Wheelbase:

Approximately 2570 mm.

Length:

Approximately 4350 mm.

Width:

Approximately 1620 mm.

Curb Weight Range:

Approximately 1100 - 1250 kg (depending on engine and equipment).

Gross Vehicle Weight Rating:

Refer to manual for specific GVWR.

🛡️ Safety Features

Safety Standards Era:

Designed to meet automotive safety standards of the late 1970s and early 1980s. Features like crumple zones and a robust passenger cell are standard.

Active Safety Features:

Brake system details, steering geometry, and suspension tuning contribute to active safety. ABS was not standard on early E21 models but could have been an option on later or specific variants.

Passive Safety Features:

Seat belts, reinforced A-pillars, and a strong chassis structure.

💡 Technology Features

Infotainment Features:

Basic analog instrumentation, AM/FM radio, and cassette player (optional). No digital or advanced infotainment systems.

Driver Assistance Systems:

No electronic driver assistance systems such as traction control, stability control, or advanced cruise control. ABS may have been available on later models.

Connectivity Features:

No external connectivity features like Bluetooth or USB ports.

🔧 Maintenance

Oil Change Interval:

Typically 5,000-7,500 km or annually, depending on driving conditions (refer to manual for exact specifications).

Engine Oil Recommendation:

Refer to manual for specific SAE viscosity grade (e.g., 10W-40, 15W-50) and API service classification. Historically, mineral-based oils were common.

Coolant Specification:

Ethylene glycol-based coolant mixed with distilled water. Specific concentration ratios provided in manual.

Transmission Fluid:

Manual transmission oil (e.g., GL-4 rated) and automatic transmission fluid (ATF) specifications are detailed in the manual.

Common E21 Issues:

Carburetor tuning issues, fuel system wear (lines, pump), ignition system maintenance, rust in common areas (wheel arches, sills), front suspension wear (bushings, ball joints), cooling system reliability, exhaust system corrosion.

Electrical System Quirks:

Potential for aging wiring harness insulation, contact issues in switches and connectors.

📚 Vehicle History

Bmw Heritage:

The E21 marked BMW's first generation of the 3 Series, solidifying the brand's reputation for sporty sedans and a focus on driving dynamics.

E21 Evolution:

The E21 replaced the popular 02 Series and introduced a more modern, aerodynamic design. It laid the groundwork for all subsequent 3 Series generations.

Key Design Elements:

Introduction of the distinctive BMW 'Hofmeister kink' in the C-pillar, integrated bumpers, and improved aerodynamics compared to its predecessor.

Production Locations:

Primarily manufactured in Germany.