The BMW 315-323i (E21) Service Repair Manual is a comprehensive guide designed for both professional mechanics and DIY enthusiasts. It covers every aspect of servicing and repairing your BMW, ensuring you have the information needed to tackle any task with confidence. This manual provides detailed step-by-step instructions, accompanied by numerous illustrations and diagrams, making even complex procedures easy to understand. You'll find comprehensive coverage of: * **Engine Overhaul and Rebuilding:** From complete engine rebuilds to routine maintenance, this section provides thorough guidance on all engine-related procedures. * **Brakes:** Master brake system repair, including adjustments, bleeding, and component replacement, with clear instructions for each step. * **Sunroof:** Learn how to diagnose and repair sunroof malfunctions, ensuring smooth operation. * **Timing Belt Replacement:** Detailed instructions for replacing the timing belt, a crucial maintenance task for maintaining optimal engine performance. * **Trouble Codes:** Decipher diagnostic codes, helping you pinpoint the cause of engine problems and guide your troubleshooting efforts. * **Wiring Diagrams:** Comprehensive wiring diagrams simplify electrical troubleshooting, enabling you to trace circuits and pinpoint electrical faults. * **Troubleshooting and Diagnostics:** Develop a systematic approach to problem-solving, utilizing the manual's comprehensive diagnostics and troubleshooting guides. * **Computer Diagnostic Trouble Tree Charts:** Navigate through troubleshooting trees for various systems, leading you to the root cause of problems efficiently. * **Engine Performance:** Optimize engine performance through detailed procedures for tuning, adjustments, and performance-related repairs. * **Front End and Alignment Procedures and Specifications:** Properly align your vehicle's front end for optimal handling and tire wear using the provided specifications. * **Suspension:** Effectively repair and maintain your suspension system, ensuring a smooth and safe ride. * **Transmission Removal and Installation:** Learn how to remove and install your transmission, providing you with the knowledge to handle major transmission repairs. * **Air Conditioning Service and Capacities:** Maintain your vehicle's climate control system with instructions for servicing, refrigerant charging, and component replacement. * **Transmission in Car Servicing:** Perform in-car transmission maintenance procedures, eliminating the need for full transmission removal in many cases. * **Computer Diagnostic Codes:** Decode computer diagnostic codes, providing clear insights into potential issues. * **Firing Orders:** Understand the proper firing order of your engine, essential for accurate troubleshooting and repair. * **Detailed Specifications on Every Model Covered:** Obtain precise specifications for each model, ensuring you use the correct parts and procedures. * **Factory Maintenance Schedules and Charts:** Follow the recommended maintenance schedule for your specific model, ensuring optimal vehicle longevity. * **Serpentine Belt Routings with Diagrams:** Correctly route and replace the serpentine belt, maintaining proper engine accessory operation. * **Timing Belt Service Procedures:** Perform timing belt service procedures with accuracy, minimizing the risk of engine damage. * **Brake Servicing Procedures:** Thoroughly service your brake system, maintaining safe and reliable braking performance. * **Driving Concerns:** Address common driving concerns with troubleshooting guides and repair information. * **Complete Torque Specifications:** Ensure proper component tightening using the manual's detailed torque specifications. * **U-Joint and CV-Joint Service Procedures:** Learn how to service and replace U-joints and CV-joints, essential components for smooth drivetrain operation. * **Repair Procedures:** Perform a wide range of repairs with detailed step-by-step procedures. * **Complete Wiring Diagrams:** Comprehensive wiring diagrams simplify electrical troubleshooting, enabling you to trace circuits and pinpoint electrical faults. * **Hundreds of Illustrations:** Clear and detailed illustrations enhance understanding and make repairs easier to perform. * **Vacuum Diagrams:** Understand the intricate workings of your vehicle's vacuum system with dedicated diagrams. This manual is your one-stop resource for servicing and repairing your BMW 315-323i (E21) model. With its detailed information, clear illustrations, and comprehensive coverage, you'll be equipped to handle a wide range of repairs and maintenance tasks with confidence.

The BMW 315-323i (E21) Service Repair Manual is a comprehensive guide designed for mechanics, technicians, and DIY enthusiasts working on the iconic first generation BMW 3 Series, also known as the E21. This manual covers all models within the E21 range, from the base 315 to the sporty 323i, offering detailed instructions and technical specifications for every system and component. It covers a wide array of topics, including engine maintenance, electrical systems, transmission and drivetrain repair, suspension and steering adjustments, brake system troubleshooting, and bodywork repair. The manual is meticulously organized, with clear diagrams, step-by-step procedures, and troubleshooting tips, making it an indispensable resource for anyone working on these classic BMWs. The BMW 315-323i (E21) itself was a revolutionary car for its time, launching in 1975 and ushering in a new era of compact luxury performance. This first generation 3 Series was a departure from BMW's traditional large sedans, offering a smaller, more agile design that embraced a sportier driving experience. It was also lauded for its handling, thanks to a rear-wheel drive setup and a well-balanced chassis. The E21 came equipped with a range of four-cylinder engines, including the 315's 1.6-liter and the 323i's powerful 2.3-liter unit. These engines were known for their smooth operation and responsive performance, making the E21 a favorite among driving enthusiasts. The E21's success solidified BMW's reputation as a producer of high-quality, performance-oriented vehicles, paving the way for the continued success of the 3 Series lineage.