1986 BMW 528e Repair Manual

The 1986 BMW 528e is a luxury executive sedan featuring the M20B27 2.7L inline-6 engine with Eta fuel economy technology, Bosch L-Jetronic fuel injection, 5-speed manual or 4-speed automatic transmission, rear-wheel drive, independent suspension, power-assisted steering, and advanced electrical systems. Below are comprehensive sections covering maintenance, repair procedures, specifications, and troubleshooting for this classic German automobile.

Vehicle Specifications

Key technical data for the 1986 BMW 528e E28 chassis.

Maintenance Schedule

Recommended service intervals for optimal performance.

1. Oil Change: Every 3,000 miles or 3 months with 10W-40 synthetic blend
2. Spark Plugs: Replace every 30,000 miles (Bosch WR9LS)
3. Air Filter: Inspect every 15,000 miles, replace as needed
4. Timing Belt: Replace every 60,000 miles
5. Coolant Flush: Every 2 years or 30,000 miles
6. Brake Fluid: Replace every 2 years (DOT 4)

WARNING! Always use jack stands when working under vehicle. Disconnect battery before electrical work.

Engine Repair Procedures

Step-by-step instructions for common engine repairs.

1. Valve Adjustment: Cold engine only, 0.010" intake, 0.012" exhaust
2. Timing Belt Replacement: Align marks at TDC, tension properly
3. Fuel Injector Service: Clean every 60,000 miles
4. Compression Test: Should read 150-175 psi across all cylinders
5. Oil Pan Gasket: Requires subframe lowering for access

CAUTION! Engine components remain hot after operation. Allow proper cooling time.

Transmission Service

• Manual Transmission: Use ATF Dexron II, capacity 1.2 liters
• Automatic Transmission: Use Dexron II, capacity 3.0 liters
• Clutch Replacement: Inspect every 60,000 miles
• Shift Linkage: Adjust for precise gear engagement
• Differential: 75W-90 gear oil, capacity 1.0 liter
• Driveshaft: Inspect center support bearing and U-joints
• Transmission Mounts: Replace if cracked or deteriorated

Electrical System

Diagnosis and repair of electrical components.

Battery: 12V 65Ah, negative ground. Alternator: 80A output. Starter: 1.4kW reduction gear type.

Fuse Box: Located under hood, left side. Main fuses: 50A (alternator), 30A (blower motor). Instrument Cluster: Check SI board batteries for corrosion. Lighting: Sealed beam headlights, replace in pairs. Central Locking: Vacuum system, check for leaks.

Brake System

Front disc brakes, rear drum brakes with ABS.

1. Brake Pad Replacement: Minimum thickness 3mm
2. Rotor Specifications: Minimum thickness 20.4mm front
3. Brake Fluid: DOT 4, bleed every 2 years
4. Parking Brake: Adjust at rear drums
5. ABS Diagnosis: Check wheel sensors and reluctor rings

Tip: Always replace brake components in axle sets.

Suspension & Steering

Independent front MacPherson struts, semi-trailing arm rear.

1. Strut Replacement: Requires spring compressor tool
2. Control Arms: Check bushings and ball joints
3. Steering Gear: Recirculating ball type, adjust lash
4. Wheel Alignment: Front toe 0°±0.2°, camber -0.5°±0.5°
5. Tire Pressure: 30 psi front, 32 psi rear
6. Sway Bar Links: Inspect for wear and replace as needed
7. Wheel Bearings: Adjust front bearings with 20 ft-lbs preload

WARNING! Use proper spring compressor for strut work. Never heat springs.

Fuel System

Bosch L-Jetronic fuel injection components and service.

Cooling System

Pressurized cooling system with electric fan.

Radiator Cap: 1.4 bar pressure. Thermostat: Opens at 80°C. Coolant: 50/50 BMW blue coolant and distilled water. Electric Fan: Thermo switch activates at 91°C. Water Pump: Replace every 60,000 miles with timing belt.

CAUTION! Never open radiator cap when hot. System operates under pressure.

Troubleshooting Guide

Reset Service Lights: Use reset tool or bridge pins in diagnostic port.

Technical Support: BMW Technical Service Bulletins available through dealer network.