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BMW 3 series e21 Service Repair Manual
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🏷️ Basic Information Identification Make: BMW Model: 3 Series Chassis Code: E21 Generation: 1st Generation Production Years: 1975-1983 👋 Introduction Market Position Target Audience: Owners and mechanics seeking detailed, authoritative...
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🏷️ Basic Information
Identification
Make:
BMW
Model:
3 Series
Chassis Code:
E21
Generation:
1st Generation
Production Years:
1975-1983
👋 Introduction
Market Position
Target Audience:
Owners and mechanics seeking detailed, authoritative information for maintaining and repairing BMW E21 models.
Competitive Analysis
Value Proposition:
Offers a comprehensive and instantly accessible alternative to expensive, hard-to-find dealership or older printed manuals.
Key Features
Instant Access:
Digital format allows for immediate download and use, eliminating shipping delays.
Completeness:
Covers a vast array of mechanical, electrical, and body systems, ensuring all aspects of the vehicle are addressed.
Support:
Customer support offered for any questions, with a satisfaction guarantee.
📋 Manual Details
Coverage
Manual Title:
BMW 3 Series E21 Service Repair Manual
Manual Type:
Service and Repair Manual
Language:
English
Format:
Digital Download (PDF)
Page Count:
Comprehensive (Exact page count not specified, but described as 'complete')
📖 Manual Coverage
Systems Covered
Engine Mechanicals:
Detailed procedures for engine disassembly, inspection, repair, and reassembly.
Engine Control Systems:
Diagnosis and repair of fuel injection and ignition control systems.
Cooling System:
Maintenance, troubleshooting, and repair of the radiator, water pump, thermostat, and coolant.
Exhaust System:
Inspection, repair, and replacement of exhaust manifolds, pipes, and mufflers.
Fuel System:
Service for fuel pumps, carburetors (where applicable), fuel lines, and filters.
Transmission Manual:
Repair and overhaul procedures for manual gearboxes.
Transmission Automatic:
Troubleshooting and repair of automatic transmission systems.
Clutch System:
Service and replacement of clutch components.
Driveline Rear Axle:
Diagnosis and repair of the rear axle, differential, and drive shafts.
Suspension Front:
Repair and adjustment of front suspension components (struts, control arms, bushings).
Suspension Rear:
Service and repair of rear suspension systems.
Road Wheels Tires:
Information on wheel balancing, tire rotation, and specifications.
Steering System:
Repair and adjustment of steering racks and components.
Power Steering:
Troubleshooting and repair of the power steering system (where equipped).
Brakes Front:
Service for front brake discs, calipers, pads, and lines.
Brakes Rear:
Service for rear brake drums/discs, shoes/pads, and lines.
Restraint System Seatbelts:
Inspection and repair of seat belt mechanisms.
Restraint System Srs:
Information on Supplemental Restraint System (SRS) components and precautions (if applicable to the E21 generation).
Body Exterior:
Repair and maintenance of body panels, trim, bumpers, and doors.
Body Interior:
Service for interior trim, upholstery, dashboard, and controls.
Locking Systems:
Repair and adjustment of door locks, latches, and key mechanisms.
Windows Mechanisms:
Service for manual and power windows, regulators, and seals.
Roof Systems:
Repair of standard roofs and sunroofs (if equipped).
Air Conditioning:
Maintenance and repair of the A/C system, including refrigerant handling (with appropriate warnings).
Electrical Wiring Diagrams:
Detailed wiring schematics for all vehicle electrical systems.
Starting Charging System:
Diagnosis and repair of the battery, alternator, and starter motor.
Lighting System:
Service for headlights, taillights, interior lights, and associated circuits.
Instrument Cluster:
Troubleshooting and repair of gauges, warning lights, and indicators.
Driver Information Systems:
Diagnosis of message systems and on-board computer functions (if equipped).
Wipers Washers:
Service for the windshield wiper and washer systems.
Horn System:
Troubleshooting and repair of the horn circuit.
Audio Video Systems:
Basic troubleshooting for factory or aftermarket audio systems.
Power Systems Distribution:
Understanding and troubleshooting the vehicle's electrical power distribution.
Procedures Included
Routine Maintenance:
Step-by-step instructions for oil changes, filter replacements, fluid checks, and lubrication.
Tune Ups:
Guidance on ignition timing, carburetor adjustment, and spark plug replacement.
Troubleshooting Diagnostics:
Systematic approaches to identifying and resolving common and complex vehicle problems.
Component Replacement:
Detailed instructions for replacing virtually all major and minor components.
Rebuild Procedures:
Comprehensive instructions for overhauling engines, transmissions, and other major assemblies.
Specifications Data:
Torque specifications, clearances, fluid capacities, and other critical data.
Wiring Diagram Interpretation:
Guidance on understanding and using complex automotive wiring schematics.
Technical Depth
Depth Of Coverage:
Expert-level diagnostic and repair procedures, suitable for both DIY enthusiasts and professional mechanics.
📊 Manual Specifications
File Attributes
File Format Type:
Portable Document Format (PDF)
Searchability:
Likely searchable text within the PDF for easy navigation.
Printability:
Designed for instant download and printing, enabling physical access to information.
Quality:
Implied high-quality scans or digital creation suitable for detailed technical information.
⚙️ Engine Specifications
Primary Engine Variants
M10 (4-Cylinder):
Available in displacements such as 1.8L (M10B18) and 2.0L (M10B20), later evolved to 2.3L (M10B23) for the 323i.
M20 (6-Cylinder):
Introduced later in the E21's life, notably the 2.3L (M20B23) found in the 323i.
Performance General
Horsepower Range:
Varies significantly by engine and market, typically from ~90 hp to ~140 hp for 4-cylinder models, and ~139 hp for the 323i.
Torque Range:
Corresponds to horsepower figures, with 6-cylinder models offering more torque.
Fuel System
Carbureted:
Early models and lower trims utilized Solex or Zenith carburetors.
Fuel Injection:
Later models, especially the 323i, featured Bosch L-Jetronic or K-Jetronic fuel injection.
🔧 Transmission
Standard Transmission
Manual Gearbox:
Typically a 4-speed or 5-speed Getrag manual transmission was standard.
Optional Transmission
Automatic Gearbox:
A ZF 3-speed automatic transmission was an optional offering on most models.
Features
Clutch Type:
Single dry plate clutch.
📐 Dimensions
Exterior General
Body Styles:
Primarily offered as a 2-door sedan, with a limited production 4-door sedan also available.
Wheelbase:
Approximately 2,563 mm (100.9 in).
Length:
Approximately 4,360 mm (171.7 in).
Width:
Approximately 1,610 mm (63.4 in).
Height:
Approximately 1,380 mm (54.3 in).
Weights
Curb Weight:
Generally ranged from 1,100 kg to 1,250 kg depending on engine and equipment.
🛡️ Safety Features
Ratings General
Era Specific Safety:
Safety features reflect the standards of the late 1970s and early 1980s. Advanced crash testing and electronic safety systems were not prevalent.
Active Features
Brakes:
Front disc brakes, rear drum brakes were standard. Some later models or options included rear disc brakes.
Steering:
Recirculating ball steering, with optional power steering available on some models.
Passive Features
Seatbelts:
Standard lap and shoulder belts for front occupants, lap belts for rear occupants.
Body Structure:
Designed with crumple zones for its time, though less sophisticated than modern vehicles.
💡 Technology Features
Infotainment
Audio System:
Typically featured basic AM/FM radios with optional cassette players. Aftermarket head units and speakers are common upgrades.
Driver Assistance
ABS:
Anti-lock Braking System (ABS) was not a standard feature on early E21 models, and only available as an option on later high-spec models.
Connectivity
Connectivity Features:
No advanced connectivity features like Bluetooth or USB ports were available from the factory.
🔧 Maintenance
Service Intervals
Oil Change:
Typically every 5,000 - 7,500 miles (8,000 - 12,000 km) or annually, depending on driving conditions.
Filter Replacement:
Oil filter with every oil change; air filter and fuel filter every 15,000 - 30,000 miles (24,000 - 48,000 km).
Spark Plugs:
Recommended replacement every 20,000 - 30,000 miles (32,000 - 48,000 km).
Fluid Specifications
Engine Oil:
API SG or SF rated multi-viscosity oil, such as 10W-40 or 20W-50 depending on climate. Consult specific manual for exact viscosity.
Coolant:
50/50 mixture of ethylene glycol antifreeze and distilled water.
Transmission Fluid Manual:
GL-4 gear oil, typically 75W-90 or 80W-90.
Transmission Fluid Automatic:
Dexron III (or equivalent) ATF.
Brake Fluid:
DOT 3 or DOT 4 brake fluid.
Known Issues
Rust And Corrosion:
Common for vehicles of this age, particularly in areas exposed to road salt. Areas to inspect: wheel arches, rocker panels, rear valence, and floor pans.
Fuel Lines:
Age-related degradation of rubber fuel lines can lead to leaks.
Cooling System Leaks:
Hoses, radiators, and water pumps can develop leaks over time.
Electrical Connections:
Corrosion or loose connections in wiring harnesses, especially grounds, can cause intermittent electrical issues.
Carburetor Issues:
Carburetors can become gummed up or require adjustment due to age and fuel quality.
📚 Vehicle History
Brand Heritage
Bmw Philosophy:
The E21 continued BMW's legacy of building sporty, driver-focused sedans with a reputation for engineering excellence and performance.
Model Evolution
Predecessor:
Succeeded the iconic BMW 2002 series.
Successor:
Succeeded by the E30 3 Series.
Design Influence:
Featured BMW's new design language, with the driver-oriented dashboard becoming a hallmark.
Production
Manufacturing Locations:
Primarily manufactured in Germany.
Sales Volume:
One of BMW's most successful models of its era, selling over 1.3 million units globally.
🏆 Awards & Recognition
Recognitions
Automotive Press Reviews:
Consistently praised by automotive press for its driving dynamics, handling, and build quality for its era, establishing the benchmark for the 3 Series line.