Segment:
Compact Executive Sports Sedan/Coupe
Reputation:
Known for its engaging driving dynamics, balanced chassis, and robust engineering, the E30 3-Series defined the premium compact sports sedan segment.
Key Competitors:
Mercedes-Benz 190E, Audi 80/90, Alfa Romeo 75 (Milano), Volvo 240, Ford Sierra XR4i.
Driving Dynamics:
Rear-wheel drive, near 50/50 weight distribution, independent suspension, responsive steering, offering a pure driving experience.
Powertrain Emphasis:
Focus on smooth, powerful inline-six engines combined with excellent chassis tuning.
Systems Covered:
Engine, Drivetrain, Suspension, Steering, Brakes, Electrical System, Fuel System, Cooling System, Exhaust System, Body and Chassis, Interior, Climate Control, Diagnostic Procedures
Estimated Page Count:
Likely 500+ pages (typical for comprehensive workshop manuals of this era)
Manual Type:
Workshop Repair Service Manual
Engine Mechanical:
Engine assembly, cylinder head, block, crankshaft, pistons, connecting rods, valve train, timing, lubrication, cooling system components.
Engine Management Electronic:
Bosch Motronic fuel injection and ignition systems (e.g., Motronic M1.1/M1.3), sensor functions, ECU diagnostics, wiring diagrams.
Drivetrain:
Clutch, gearbox (Getrag 260 5-speed manual, ZF 4HP22 4-speed automatic), driveshaft, differential, axle shafts.
Suspension Steering:
Front McPherson strut, rear semi-trailing arm, springs, shock absorbers, bushings, steering rack, power steering system, alignment specifications.
Brakes:
Front vented discs, rear solid discs, ABS (Anti-lock Braking System) components and diagnostics (where applicable), brake fluid specifications, bleeding procedures.
Electrical System:
Battery, alternator, starter motor, lighting systems, fuses, relays, wiring harness routing, component testing, comprehensive wiring diagrams.
Maintenance Procedures:
Oil and filter changes, spark plug replacement, air filter replacement, fuel filter replacement, coolant flushes, brake pad replacement, belt inspections and replacement.
Repair Procedures:
Engine rebuilds, transmission overhauls, suspension component replacement, brake system repairs, electrical component troubleshooting and replacement, body panel repairs.
Troubleshooting:
Diagnostic flowcharts for common drivability issues, starting problems, electrical faults, and performance issues based on symptoms.
Specifications Data:
Torque values, clearances, fluid capacities, electrical resistance values, diagnostic trouble codes (DTCs), alignment angles.
Depth Of Coverage:
Comprehensive, from basic routine maintenance to in-depth engine and transmission overhauls, including electrical system diagnostics and troubleshooting.
PDF Quality:
High-resolution scans or digitally created PDF, ensuring clarity of text and diagrams. Searchable text is a strong possibility for professional manuals.
Printable Pages:
Typically designed to be printable, allowing users to print specific sections or the entire manual.
Original Binding:
Original manuals were typically professionally bound (hardcover or spiral-bound) for durability in workshop environments.
Original Paper Type:
Durable, often glossy or semi-gloss paper to withstand grease and extensive use.
Engine Code:
M20B27 (SOHC Inline-6)
Engine Type:
Naturally Aspirated, Inline 6-Cylinder, SOHC
Displacement:
2.7 Liters (2693 cc)
Horsepower:
121 hp @ 4800 rpm (US spec 'eta' engine for fuel economy, often detuned for emissions), ~168 hp @ 5500 rpm (Euro spec 'i' version) and ~170 hp for later US 325i (e.g., 1987+ with higher compression and revised Motronic)
Torque:
170 lb-ft @ 3000 rpm (US spec 'eta'), ~200 lb-ft @ 4000 rpm (Euro spec 'i') and ~204 lb-ft for later US 325i
Fuel Delivery:
Bosch Motronic electronic fuel injection and ignition system (e.g., Motronic M1.1, M1.3)
Fuel Type:
Unleaded gasoline (premium recommended)
Bore X Stroke:
84.0 mm x 81.0 mm
Compression Ratio:
9.0:1 (US spec 'eta'), 9.7:1 (US spec 'i' 1987+)
Crash Test Performance:
NHTSA ratings were not standardized as they are today. However, the E30 chassis was designed with a robust safety cell, crumple zones, and safety features considered advanced for its time.
ABS:
Optional on earlier models, standard on later 325i and M3 models.
Seat Belts:
Three-point retractable front seat belts, lap belts for rear passengers.
Steering Column:
Collapsible steering column for improved impact protection.
Audio System:
Factory-installed radio/cassette player (e.g., Blaupunkt, Grundig) with optional amplifier and speaker upgrades. Basic analog controls.
ABS:
Optional Anti-lock Braking System (ABS) on most models, particularly noticeable in later production years. Diagnostics can be complex.
Diagnostics Port:
On-board diagnostics (OBD) port existed but was not as standardized as modern systems. Manual will detail specific diagnostic procedures and connector locations for the Motronic system.
Oil Change:
Typically every 5,000-7,500 miles (8,000-12,000 km) or annually, using synthetic oil. The manual will specify the exact interval and oil type.
Spark Plugs:
Recommended replacement around 30,000 miles (48,000 km).
Timing Belt:
Critical component for the M20 engine. Replacement typically every 50,000-60,000 miles (80,000-100,000 km) or 5 years. Failure is catastrophic.
Engine Oil:
Owner's manual or workshop manual will specify viscosity (e.g., 15W-50, 10W-40, or 5W-30 depending on climate and oil type). BMW recommends Castrol or equivalent high-quality synthetic. Capacity approx. 4.5 liters.
Coolant:
Ethylene glycol-based antifreeze. Mixture of 50/50 antifreeze and distilled water. Capacity approx. 6.5 liters.
Brake Fluid:
DOT 3 or DOT 4, depending on specific system requirements. Manual will confirm.
Transmission Fluid Manual:
Gear oil, e.g., Castrol TAF-X or equivalent GL-4 rated gear oil. Capacity approx. 1.2 liters.
Transmission Fluid Automatic:
ATF Dexron II or III. Capacity approx. 1.7 liters for initial fill.
Engine Mounts:
Hydraulic engine mounts tend to leak and degrade over time, causing vibration.
Cooling System:
Plastic coolant expansion tanks can become brittle and crack. Thermostat housing can also leak. Water pump seals can fail.
Electrical Connectors:
Corrosion in electrical connectors, particularly in engine bay, can lead to intermittent faults. Check Motronic connectors.
Suspension Bushings:
Rubber bushings in control arms and trailing arms wear out, affecting handling and ride quality.
Fuel Lines:
Rubber fuel lines can degrade, leading to leaks. Metal lines can corrode.
Bmw Philosophy:
BMW's long-standing reputation for building driver-focused vehicles with sophisticated engineering and high build quality.
E30 Introduction:
The E30 generation replaced the E21 and was produced from 1982 to 1994 globally. It saw significant updates throughout its lifecycle, including the introduction of the 325i model.
325I Introduction:
The 325i, featuring the larger 2.7L M20 engine (initially the 'eta' version for economy in some markets, later the more powerful 'i' version), was a key model in the E30 lineup, offering a significant performance upgrade.
Manufacturing Locations:
Primarily Munich, Germany, with some production in other BMW plants.
Automotive Journalism Awards:
The E30 platform, particularly the 325i and M3 variants, consistently received high marks from automotive publications like Car and Driver, MotorTrend, and Road & Track for its performance, handling, and build quality.
Driving Purity Ranking:
Widely regarded as one of the benchmarks for driver engagement and handling in its class, often cited in 'best handling cars' lists from its era.
