1986 Porsche 928 Service Manual

The 1986 Porsche 928 Service Manual provides comprehensive technical information for maintaining and repairing the Porsche 928 model year 1986. This manual covers engine systems, transmission, electrical systems, suspension, brakes, bodywork, and routine maintenance procedures. Below are key sections for specifications, maintenance schedules, troubleshooting, and repair procedures.

1. Vehicle Specifications 2. Maintenance Schedule 3. Engine Systems 4. Transmission & Drivetrain 5. Electrical Systems 6. Suspension & Steering 7. Brake Systems 8. Body & Interior 9. Troubleshooting Guide 10. Safety Precautions 11. Technical Data

Vehicle Specifications

Key technical specifications for the 1986 Porsche 928.

Specification	Description
Engine Type	4.7L V8 aluminum alloy
Power Output	288 hp @ 5750 rpm
Torque	302 lb-ft @ 3000 rpm
Transmission	5-speed manual or 4-speed automatic
Fuel System	Bosch K-Jetronic fuel injection
Brakes	Four-wheel disc brakes with ABS
Suspension	Independent front and rear with torsion bars
Wheelbase	98.4 inches
Curb Weight	3450 lbs
Fuel Capacity	21.1 gallons

Maintenance Schedule

Recommended maintenance intervals for optimal performance.

Oil and filter change: Every 7,500 miles or 12 months
Spark plugs: Replace every 30,000 miles
Timing belt: Inspect every 60,000 miles, replace every 90,000 miles
Brake fluid: Flush every 2 years
Coolant: Replace every 4 years
Air filter: Replace every 15,000 miles
Transmission fluid: Change every 60,000 miles

WARNING! Always use Porsche-approved fluids and parts. Follow torque specifications precisely.

Engine Systems

Detailed procedures for engine maintenance and repair.

Engine removal and installation procedures
Cylinder head service and valve adjustment
Fuel injection system troubleshooting
Ignition system maintenance
Cooling system service
Exhaust system inspection

CAUTION! Engine components are precision parts; handle with care and use proper tools.

Transmission & Drivetrain

Manual Transmission: Gear ratios, shift linkage adjustment, clutch replacement
Automatic Transmission: Fluid change procedures, shift cable adjustment
Differential: Service intervals, fluid specifications
Drive Axles: CV joint inspection and replacement
Clutch System: Hydraulic system bleeding, pedal adjustment

Electrical Systems

Complete electrical system diagnostics and repair.

Main Components: Battery, alternator, starter, wiring harness, fuses, relays.

Diagnostic Procedures: Voltage testing, continuity checks, component testing. Wiring diagrams included for troubleshooting complex electrical issues. Special attention to fuel injection and ignition system wiring.

Suspension & Steering

Front and rear suspension service procedures.

Front suspension: Strut replacement, ball joint inspection
Rear suspension: Torsion bar adjustment, trailing arm bushings
Steering system: Power steering pump, rack and pinion service
Wheel alignment: Specifications and adjustment procedures

Tip: Always check suspension components for wear during routine maintenance.

Brake Systems

Complete brake system maintenance and repair.

Brake pad replacement: Front and rear procedures
Rotor service: Inspection and replacement specifications
ABS system: Diagnostic procedures and component testing
Brake bleeding: Proper procedure for hydraulic system
Parking brake: Adjustment and cable replacement

WARNING! Always test brake system after service before road use.

Body & Interior

Body panel alignment, interior component service.

Door adjustment, window regulator service, seat mechanisms, dashboard components. Electrical accessories: Power windows, sunroof, central locking system.

Troubleshooting Guide

Common issues and diagnostic procedures.

Symptom	Possible Cause	Corrective Action
Engine won't start	Fuel pump, ignition, battery	Check fuel pressure, spark, battery voltage
Poor fuel economy	Fuel injection, sensors	Test oxygen sensor, fuel pressure regulator
Brake vibration	Warped rotors	Inspect and replace brake rotors
Electrical issues	Alternator, battery	Test charging system, check grounds
Transmission slipping	Fluid level, clutch	Check fluid, inspect clutch components

Safety Precautions

Essential safety procedures for all service work.

Always disconnect battery before electrical work. Use jack stands when lifting vehicle. Wear appropriate safety equipment. Follow proper fluid disposal procedures.

CAUTION! Fuel system work requires special precautions - relieve pressure before service.

Technical Data

Complete technical specifications and torque values.

Engine Torque Specs: Cylinder head bolts, main bearings, rod bolts
Fluid Capacities: Engine oil, coolant, transmission, brake fluid
Electrical Data: Battery specifications, fuse ratings, bulb types
Wheel Alignment: Camber, caster, toe specifications
Tire Pressures: Recommended cold inflation pressures

Service Support: Contact Porsche technical support for complex issues.