🏷️ Basic Information

Make:

BMW

Model:

3 Series

Chassis Code:

E30

Model Year:

1985

Engine Codes Covered:

M10 (4-cylinder), M20 (6-cylinder)

Chassis Codes Covered:

E30 (specific to 1985 production year)

👋 Introduction

E30 Market Position:

The BMW E30 (1983-1991) revolutionized the compact executive sports sedan segment, offering a compelling blend of performance, luxury, and driving dynamics that cemented BMW's reputation.

Key Competitors 1985:

Mercedes-Benz 190E (W201), Audi 4000, Alfa Romeo Milano, Volvo 240, Cadillac Cimarron (though less direct).

E30 Design Philosophy:

Focus on driver engagement, balanced chassis, robust engineering, and a driver-centric cockpit.

Manual Value Proposition:

Essential resource for owners and independent mechanics seeking to maintain and repair their 1985 E30 accurately, ensuring longevity and performance.

📋 Manual Details

Primary Coverage:

Service, Repair, Maintenance, Diagnostics

Secondary Coverage:

Troubleshooting, Wiring Diagrams, Specifications

Estimated Page Count:

800-1200 (typical for comprehensive workshop manuals of this era)

Manual Classification:

Workshop Manual / Service Manual / Repair Manual

Language:

English

Format:

Digital (likely PDF), potential for printed reproduction

📖 Manual Coverage

Engine Mechanical:

Engine disassembly, assembly, overhaul, timing, valve adjustments, piston/ring installation, cylinder head repair

Engine Management:

Fuel injection systems (Bosch L-Jetronic/Motronic), ignition systems, sensor diagnostics, ECU troubleshooting

Fuel System:

Fuel pump, fuel injectors, fuel pressure regulator, fuel tank, lines, L-Jetronic/Motronic system operation

Cooling System:

Radiator, water pump, thermostat, hoses, coolant types, bleeding procedures

Exhaust System:

Exhaust manifolds, catalytic converter (if equipped for US market), mufflers, pipes, hangers

Transmission Manual:

Clutch operation, gear shifting mechanisms, transmission disassembly, assembly, fluid specifications, bearing replacement

Transmission Automatic:

Automatic transmission operation, fluid types, torque converter, hydraulic control, troubleshooting, band/clutch pack inspection

Drivetrain:

Driveshafts, universal joints, differential, rear axle assembly, wheel bearings

Suspension Front:

MacPherson struts, control arms, ball joints, tie rods, springs, shock absorbers, sway bar

Suspension Rear:

Independent rear suspension, trailing arms, shock absorbers, springs, sway bar

Steering System:

Power steering pump, steering rack, steering column, tie rod ends, fluid specifications

Brake System:

Front disc brakes, rear disc brakes (most E30s), brake fluid specifications, caliper rebuild, master cylinder, ABS (if equipped), parking brake

Electrical System:

Battery, alternator, starter motor, lighting systems, fuses, relays, ignition switch, wiring harness inspection

Body And Chassis:

Body panel removal/installation, door mechanisms, glass replacement, body repairs, rust prevention advice

Interior Trim:

Seat removal, dashboard disassembly, center console, door panels, headliner

HVAC System:

Blower motor, heater core, A/C system (if equipped), controls, refrigerant (older R12 for this era), troubleshooting

Wheels And Tires:

Tire sizes, wheel specifications, bolt patterns, torque specifications

Routine Maintenance:

Oil changes, filter replacements (oil, air, fuel), spark plug replacement, coolant flushes, brake fluid changes

Troubleshooting Guides:

Diagnostic charts for common symptoms (e.g., no-start, rough idle, overheating), fault finding procedures

Repair Procedures:

Step-by-step instructions for component removal, replacement, and reassembly for all major systems

Diagnostic Techniques:

Methods for checking ignition timing, fuel pressure, compression testing, electrical circuit continuity

Adjustment Procedures:

Idle speed adjustments, throttle cable adjustments, clutch adjustment, headlight aiming

Wiring Diagrams:

Detailed electrical schematics for all vehicle systems, including component identification and wire colors

Depth Of Information:

Comprehensive: Covers everything from basic maintenance to full engine and transmission rebuilds, including complex diagnostics.

Diagnostic Tools Required:

Basic hand tools, multimeter, compression tester, fuel pressure gauge, timing light. Advanced diagnostics may require specific BMW tools of the era.

Special Tool References:

Mentions of BMW-specific tools required for certain procedures (e.g., flywheel lock tool, valve spring compressor).

📊 Manual Specifications

Digital Format:

Likely PDF. Searchable text is a significant advantage if available.

Print Quality Notes:

If printed, expect quality similar to original manuals. Digital versions may vary but are typically clear.

Binding Type:

N/A (Digital). If printed, would be perfect bound or spiral bound for ease of use.

Paper Type:

N/A (Digital). Original manuals used durable paper stock.

⚙️ Engine Specifications

1985 Engine Options:

4-cylinder: 318i (M10B18, 1.8L), 6-cylinder: 325e (M20B27 'eta', 2.7L), 325i (M20B25, 2.5L - often phased in during '85 or for later models of the year)

1985 318I Horsepower:

101 hp @ 5800 rpm

1985 318I Torque:

105 lb-ft @ 3250 rpm

1985 325E Horsepower:

121 hp @ 4800 rpm (US Spec)

1985 325E Torque:

170 lb-ft @ 3250 rpm (US Spec)

1985 325I Horsepower:

168 hp @ 5800 rpm (US Spec)

1985 325I Torque:

164 lb-ft @ 4000 rpm (US Spec)

Fuel Injection Type:

Bosch L-Jetronic (318i, some 325e), Bosch Motronic (325e, 325i)

Fuel Type:

Unleaded gasoline

Ignition System:

Distributor-based electronic ignition, or Motronic integrated system.

🔧 Transmission

Standard Transmission Type:

4-speed manual (318i), 5-speed Getrag manual (325e, 325i)

Optional Transmission Type:

3-speed automatic (early models), 4-speed automatic (later models, e.g., ZF 4HP22)

Clutch Type:

Hydraulically actuated single dry plate clutch.

Rear Axle Ratio Typical:

3.91:1 (manual 318i), 3.25:1 (325e manual), 3.73:1 (325i manual - common with LSD)

📐 Dimensions

Wheelbase Sedan:

2,570 mm (101.2 in)

Wheelbase Coupe:

2,570 mm (101.2 in)

Wheelbase Convertible:

2,570 mm (101.2 in)

Curb Weight 318I Sedan Est:

1,150 kg (2,535 lbs)

Curb Weight 325I Sedan Est:

1,270 kg (2,800 lbs)

Gross Vehicle Weight Rating:

Approx. 1,700 kg (Varies by model)

Trunk Capacity Sedan Est:

0.43 m³ (15.2 cu ft)

🛡️ Safety Features

Historical Safety Ratings:

NHTSA and IIHS data from this era is limited by modern standards. E30 generally regarded as a safe car for its time due to solid construction.

Active Safety Features:

Four-wheel disc brakes (standard on most 1985 models), optional ABS (Anti-lock Braking System) on some models, rear wheel drive bias for stability.

Passive Safety Features:

Collapsible steering column, reinforced passenger cell, front and rear crumple zones, seat belts.

💡 Technology Features

Infotainment 1985:

Basic analog radio (AM/FM), optional cassette player. Speaker systems were rudimentary by modern standards.

Driver Assistance 1985:

Limited. Optional ABS on higher-end models. Primarily focused on mechanical feedback and driver control.

Connectivity 1985:

Non-existent by modern standards. No provisions for external device integration.

🔧 Maintenance

Oil Change Interval Typical:

Every 5,000-7,500 miles (8,000-12,000 km) or annually, depending on driving conditions and oil quality used. Check manual for specific recommendations.

Timing Belt Service:

M20 engines (6-cylinder) use a timing belt. Replacement interval is typically 30,000-50,000 miles (48,000-80,000 km). M10 engines (4-cylinder) have a timing chain.

Brake Fluid Change Interval:

Every 2 years, regardless of mileage, to prevent moisture absorption which degrades performance and can cause corrosion.

Engine Oil Specification:

SAE 15W-40 or 10W-40 typically recommended for M10/M20 engines in moderate climates. Check specific API/ACEA ratings and BMW approvals in the manual.

Coolant Specification:

BMW Blue Coolant (ethylene glycol based) or equivalent for this era. Mix 50/50 with distilled water. Capacity approx. 6-8 liters.

Brake Fluid Specification:

DOT 3 or DOT 4. Manual will specify exact type. Capacity approx. 0.75-1 liter.

Transmission Fluid Manual Mtf:

API GL-4 SAE 75W-90 or 80W-90 gear oil. Capacity approx. 1.5-1.8 liters.

Transmission Fluid Automatic Atf:

Dexron II or equivalent. Consult manual for precise BMW specification (e.g., ATF D2).

Power Steering Fluid:

ATF Dexron II or specified hydraulic fluid.

Common E30 Issues:

Cooling system leaks (cracked plastic expansion tanks, failing water pumps), fuel distributor diaphragm leaks (L-Jetronic), trailing arm bushings, rust (especially around fenders, rocker panels, battery tray), instrument cluster failure, door handle mechanisms.

Engine Specific Issues M20:

Head gasket leaks, oil filter housing leaks, timing belt issues if not replaced on schedule, oil pan leaks.

📚 Vehicle History

Bmw Heritage:

Bayerische Motoren Werke AG, founded in 1916, has a long history of engineering excellence, particularly in performance automobiles and motorcycles.

E30 Introduction:

The E30 generation replaced the E21 3 Series. It was introduced in 1982 for the 1983 model year and was produced until 1991, becoming one of BMW's most iconic and successful models.

E30 Production Years:

1982-1991

E30 Body Styles:

2-door sedan, 4-door sedan, convertible, and later the M3 variant.

🏆 Awards & Recognition

E30 Automotive Journal Awards:

The E30 was widely praised by automotive publications for its handling, performance, and build quality, frequently appearing on 'best of' lists and earning accolades for sports sedan characteristics.

Car And Driver E30 Praise:

Car and Driver often lauded the E30 for its superior handling, driver feel, and performance, comparing it favorably to its competitors.