Positioning:
The BMW 325i Convertible (E30) was a premium compact luxury convertible, celebrated for its engaging driving dynamics, refined engineering, and sporty styling. It competed with models like the Mercedes-Benz 190SL (W201) Convertible, Audi 80/90 Cabriolet, and lower-spec Porsche 944 models.
Strengths:
Superior handling, balanced chassis, potent inline-six engine, high-quality interior materials, and timeless design. The convertible offered a distinct open-air driving experience.
Driving Dynamics:
Rear-wheel drive, near 50/50 weight distribution, independent suspension providing exceptional road feel and feedback.
Convertible Top:
Fully powered soft top with insulation for comfort, a significant feature for its class.
Engine Performance:
The M20B25 engine offered a strong blend of performance and refinement for its era.
Engine:
M20 2.5L inline-six (M20B25), including overhaul, tuning, lubrication, cooling, fuel injection (Bosch Motronic), ignition system, emissions control.
Transmission:
Getrag 260 5-speed manual and ZF 4HP22 4-speed automatic transmissions. Includes repair, adjustment, fluid specifications, and troubleshooting.
Drivetrain:
Rear-wheel drive system, differential, driveshafts, CV joints, clutch system (manual), torque converter (automatic).
Suspension:
Front MacPherson struts, rear semi-trailing arms, springs, shock absorbers, control arms, sway bars, bushings. Includes alignment specifications.
Brakes:
Front ventilated discs, rear solid discs. ABS system, brake lines, calipers, master cylinder, parking brake. Includes bleeding procedures and specifications.
Steering:
Power assisted rack and pinion, steering column, intermediate shaft, tie rods. Includes pump, fluid, and troubleshooting.
Electrical:
Complete wiring diagrams for all systems: engine management, lighting, instruments, power windows, convertible top, sound system, charging system (alternator, starter), battery, fuses, relays.
Body:
Exterior panels, doors, hood, trunk, bumpers, convertible top mechanism (hydraulic and electrical components), interior trim, seats, dashboard.
HVAC:
Heating, ventilation, and air conditioning system components, refrigerant R12 (as per original spec), compressor, condenser, evaporator, controls.
Maintenance:
Oil changes, filter replacements, spark plug replacement, coolant flushes, brake fluid changes, belt inspections and replacement, lubrication points.
Repair:
Engine rebuild, transmission overhaul, suspension component replacement, brake system repair, electrical component diagnosis and replacement, convertible top repair.
Troubleshooting:
Diagnostic procedures for engine performance issues, electrical faults, transmission problems, brake system malfunctions, and convertible top operation.
Diagnostics:
Step-by-step diagnostic flowcharts for common and uncommon issues, including on-board diagnostics (OBD I) if applicable to specific systems.
Specifications:
Torque specifications for all fasteners, engine clearances, timing procedures, fuel pressure, electrical component resistance values, alignment settings.
Depth:
Comprehensive from basic maintenance to complete engine and transmission rebuilds. Suitable for professional technicians and advanced DIY enthusiasts.
Type:
Getrag 260 5-speed manual transmission
Type:
ZF 4HP22 4-speed automatic transmission
Manual Gear Ratios:
1st: 3.72, 2nd: 2.40, 3rd: 1.57, 4th: 1.00, 5th: 0.81, Reverse: 3.40 (typical)
Automatic Features:
Lock-up torque converter, sport/economy mode selection (on some variants).
Manual Transmission Fluid:
BMW ATF D2 (Dexron II) or equivalent, approx. 1.5 liters
Automatic Transmission Fluid:
BMW ATF D2 (Dexron II) or equivalent, approx. 8.0 liters (fill)
Oil Change:
Every 7,500 miles or 12 months (using synthetic oil).
Coolant Flush:
Every 24,000 miles or 24 months.
Spark Plugs:
Every 30,000 miles (Bosch W8AC or equivalent).
Timing Belt:
Critical: The M20 engine uses a timing belt. Replacement recommended every 60,000 miles or 5 years due to potential catastrophic failure if it breaks.
Engine Oil:
SAE 5W-30 or 5W-40 synthetic engine oil, API SJ or higher. Capacity: 4.5 liters (with filter).
Coolant:
BMW Blue Antifreeze/Coolant (G48 ethylene glycol based) or equivalent, 50/50 mix with distilled water.
Brake Fluid:
DOT 4 or DOT 3 brake fluid.
Engine Cooling System:
Thermostat failure, water pump leaks, hose degradation, radiator leaks, and coolant expansion tank cracks are common. Overheating can cause significant engine damage.
Fuel System:
Fuel pump failures, injector clogging, and aging fuel lines can cause performance issues.
Suspension:
Worn control arm bushings, ball joints, and shock absorbers lead to vague steering and poor handling. Rear trailing arm bushings are also prone to wear.
Convertible Top:
Hydraulic system leaks, pump failures, motor issues, and fabric wear are common. Seal degradation can lead to water leaks.
Electrical System:
Fuse box issues, headlight switch failures, door lock actuator problems, and wiring harness degradation in engine bay and door hinges.
Rust:
Common rust areas include wheel arches, rocker panels, floor pans, and around the rear window seal, especially in convertible models.
Bmw Philosophy:
BMW's reputation for 'The Ultimate Driving Machine' was firmly established with the E30 generation, emphasizing performance, handling, and driver engagement.
E30 Generation:
The E30 chassis, introduced in 1982, was a highly successful platform that replaced the E21. The convertible variant debuted in 1985 and became a significant sales success.
325I Convertible Introduction:
Launched in 1985 in Europe and 1987 in North America, the 325i Convertible quickly became an icon. The model years 1988-1992 represent the later, often updated, versions of this convertible.
Production Period:
E30 convertible production spanned from 1985 to 1993.
Manufacturing Locations:
Primarily Germany (Dingolfing and Regensburg).
