This service manuals provide the highest level of clarity and completeness for service and repair procedures. Enthusiasts, do-it-yourselfers, and professional technicians will appreciate the quality of photos and illustrations, theory of operation, and accurate step-by-step instructions. If you're looking for better understanding of your Porsche 911, look no further. Engine covered in this Porsche repair manual: 3.2 liter 6-cylinder (930/21 and 930/25), horizontally opposed, air cooled. This manual includes a complete engine disassembly and rebuilding guide, with full details on techniques and specifications, as well as camshaft and timing chain replacement techniques with engine in car. Transmissions covered: 915 (5-speed, with cable-operated clutch) & G50 (5-speed, with hydraulic clutch). Complete removal and disassembly guide, including clutch disassembly, clutch cable and linkage rebuilding, clutch hydraulics service. Technical highlights: Maintenance procedures from changing the oil in the 11-quart dry-sump lubrication system to adjusting front wheel bearing play. This manual tells you what to do and how and when to do it. Illustrated engine disassembly and rebuilding, including camshaft, timing chain, and timing chain tensioner replacement with the engine in or out of the car. Dry-sump lubrication system repair and diagnosis, including replacing leaky oil return tubes with the engine installed. Carrera-specific driveability problems, including explanation of the Bosch DME engine management system. Complete overhaul of the 915 transmission, including replacing the synchronizer dog teeth. Complete clutch service, including clutch cable replacement (1984-86 models) and clutch hydraulics service (1987-1989 models). Brake, steering and suspension system maintenance, troubleshooting, and repair, including torsion bar setup and adjustment. Heating and air conditioning repair, including A/C component replacement. Body adjustments and repairs, including power seat disassembly and repair. Electrical system diagnosis and fault finding, with an easy-to-use illustrated component locator section. Wiring schematics for all circuits, including power distribution, grounds, convertible top, rear wiper and other hard to find circuits. With 768 pages, over 1200 photos, illustrations and diagrams.