1984-1990 BMW 3 Series Service Manual (318i, 325, 325e, 325es, 325i, 325is, 325i Convertible)

Technical Scope and Coverage

• Covers 1984–1990 BMW 3 Series, including 318i, 325, 325e, 325es, 325i, 325is, and 325i Convertible models with 4-cylinder and 6-cylinder engines.
• Original OEM publication, Bentley Publishers Part No. B390, copyright 1991.
• Contains 16 distinct chapters covering maintenance, engine management, ignition, fuel systems, suspension, and electrical systems.
• Indexed PDF search covers every chapter and appendix.
• Accessible from your device as soon as the order is placed.
• This 554-page factory-authorized guide provides the standard reference for engine mechanical work, driveability diagnostics, and routine service intervals for the E30 generation.

Manual Content Preview

The text details a systematic approach to engine management and driveability for the 3 Series. The opening chapters provide a foundation in fundamentals, detailing automotive systems, safety, and essential tool requirements for the home mechanic. Subsequent sections provide technical prose on fuel injection systems including the Bosch L-Jetronic and Motronic iterations, explaining how air flow sensors, oxygen sensors, and electronic control units integrate to optimize performance. Coverage extends to under-car maintenance, detailing suspension and steering, brakes, final drive, and manual or automatic transmission service. The manual structure follows a logical path from routine maintenance schedules—based on the BMW Service Indicator System—to in-depth engine mechanical work and complex electrical circuit tracing.

Specification and Reference Data

Technical data is provided for engine parameters, including displacement, compression ratios, and horsepower ratings for various engine configurations. The manual documents torque specifications for cylinder head bolts, spark plugs, and transmission fasteners, typically listed in both Nm and ft-lb. Fuel and fluid capacity tables for oil, transmission, coolant, and final drive lubricants are included alongside viscosity charts for temperature-specific selection. Electrical system data, including test light procedures and wiring harness connector diagrams, provides diagnostic thresholds for sensors and injectors. Cylinder head specifications, valve adjustments, and compression pressure tables support internal engine reconditioning, with specific tolerances listed for piston skirt measurements and crankshaft clearances. All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work. This is a 554-page Bentley Publishers service publication documenting 1984–1990 BMW 3 Series engine, electrical, chassis, and fuel system specifications for the E30 body style.