This comprehensive service and repair manual is your ultimate guide to maintaining, repairing, rebuilding, refurbishing, or restoring your BMW 315-323i (E21). It covers every aspect of your car, regardless of model or engine type.

The manual delves into detailed diagnostic and repair procedures, ensuring you have everything necessary to tackle any project. You'll find clear step-by-step instructions complemented by detailed illustrations, diagrams, wiring schematics, and specifications.

The manual covers a vast range of topics, including:

* **Engine Overhaul and Rebuilding:** From complete engine disassembly and reassembly to detailed instructions on specific components.
* **Brakes:** Comprehensive service and repair procedures for all brake components, ensuring safe and efficient braking.
* **Sunroof:** Detailed instructions on sunroof operation, maintenance, and repair.
* **Timing Belt Replacement:** Step-by-step guidance for replacing the timing belt, a critical aspect of engine maintenance.
* **Trouble Codes:** Decoding and understanding fault codes for diagnosing engine and other system problems.
* **Wiring Diagrams:** Detailed wiring diagrams for every system, simplifying troubleshooting and repair.
* **Troubleshooting and Diagnostics:** A comprehensive guide to identifying and resolving various vehicle issues.
* **Computer Diagnostic Trouble Tree Charts:** A valuable tool for pinpointing and resolving electronic system problems.
* **Engine Performance:** Troubleshooting and optimizing engine performance for maximum efficiency.
* **Front End and Alignment Procedures:** Detailed instructions for front end alignment and adjustment for optimal vehicle handling.
* **Suspension:** In-depth information on suspension components, service, and repair.
* **Transmission Removal and Installation:** Step-by-step guidance for removing and installing the transmission.
* **Air Conditioning Service and Capacities:** Instructions on servicing and maintaining the air conditioning system, including refrigerant capacities.
* **Transmission In-Car Servicing:** Comprehensive information on servicing the transmission without removal.
* **Computer Diagnostic Codes:** Interpretation and analysis of computer diagnostic codes.
* **Firing Orders:** Specific firing orders for different engine types.
* **Detailed Specifications:** Complete specifications for every model covered in the manual.
* **Factory Maintenance Schedules:** Recommended maintenance schedules to ensure optimal vehicle performance.
* **Serpentine Belt Routing Diagrams:** Clear diagrams showing the correct routing of the serpentine belt.
* **Timing Belt Service Procedures:** Detailed instructions for performing timing belt service procedures.
* **Brake Servicing Procedures:** Comprehensive guidance on brake service procedures.
* **Driving Concerns:** Diagnosing and resolving common driving issues.
* **Complete Torque Specifications:** Accurate torque specifications for all components.
* **U-Joint and CV-Joint Service Procedures:** Information on servicing and replacing universal joints and constant velocity joints.
* **Repair Procedures:** Detailed repair procedures for a wide range of components.
* **Complete Wiring Diagrams:** Comprehensive wiring diagrams for all vehicle systems.
* **Hundreds of Illustrations:** Clear and informative illustrations for visual guidance.
* **Vacuum Diagrams:** Vacuum diagrams for troubleshooting engine and other systems.

This comprehensive manual is your go-to resource for all your BMW 315-323i (E21) repair and service needs.

The BMW 3 Series (E21) is a compact executive car that marked the beginning of a legendary lineage for the German automaker. Produced from 1975 to 1983, the E21 was the first generation of the 3 Series and established the model's reputation for sporty handling and driving dynamics. The 315-323i model range included a variety of four-cylinder engines, ranging from the 1.6-liter M10 unit in the 315 to the 2.3-liter M20 engine powering the 323i. While the 315 was a more budget-friendly option, the 323i delivered impressive performance for its time, with a top speed exceeding 120 mph. The E21 featured a distinctive design with a long hood, a sloping roofline, and a narrow rear end, giving it a sporty and elegant look. Its lightweight construction, paired with precise steering and independent suspension on all four wheels, contributed to its agile handling and driving pleasure.

The BMW 3 Series (E21) was a success, with over 1.3 million units sold worldwide. It paved the way for the future generations of the 3 Series, which have continued to be renowned for their performance, handling, and driving experience. While the E21 might appear dated by today's standards, it remains a highly sought-after classic car among BMW enthusiasts. Its timeless design, engaging driving dynamics, and the availability of several engine options make the E21 a captivating vintage machine. The detailed service and repair manual for the 315-323i models, available as a PDF, provides valuable information for owners and enthusiasts looking to maintain and restore their E21 to its former glory. From routine maintenance tasks to more complex repair procedures, the manual serves as an indispensable guide for ensuring the long-term enjoyment of this iconic BMW.