1975–1989 Porsche 911 Turbo (930) Workshop Manual (P/N WKD 481 321)

This six-PDF set of Porsche factory workshop material covers Turbo-specific service and repair information for the Porsche 911 Turbo and Turbo Carrera (Type 930), with model-specific material spanning Model 75 through Model 89. Porsche identifies shop foremen and mechanics as the users who need this information; its component-level procedures, dedicated gauges, and test-equipment requirements make it best suited to experienced technicians with an equipped workshop. It is not a stand-alone replacement for the regular 911 Repair Manual, which Porsche specifies for operations shared with standard 911 models.

• 973 PDF pages in six files — Turbo Carrera Workshop Manual, 407 pages; Volume 1a Engine, 177 pages; Volume 1b Transmission, 99 pages; Volume 1c Chassis, 74 pages; Volume 2a Body/Heating, 31 pages; Volume 2b Electrics, 185 pages. The 407-page manual is US Order No. WKD 481 321, Edition 1976; the split volumes contain later revised pages through Model 89.
• Engine sections cover engine/transmission-unit removal, separation and installation; piston and cylinder measurement; flywheel service; valve-spring inspection; valve-clearance and camshaft-timing adjustment; lubrication data; and the Model 89 hydraulic-clutch installation.
• Turbo and fuel-system material addresses KKK turbocharger removal and inspection, shaft-play checks, wastegate and bypass-valve service, boost-pressure testing, turbocharger oil supply and oil-pump work, charge-air cooler removal, CIS/K-Jetronic pressure diagnosis, air-flow sensor-plate adjustment, Lambda checks, and Bosch CDI troubleshooting.
• Transmission repair content includes clutch removal and assembly, 930 four-speed case and gearset disassembly, selector-fork adjustment, synchronization checks, drive-pinion and ring-gear setup, backlash measurement, and limited-slip differential service.
• Chassis and body coverage reaches front- and rear-axle teardown, wheel-bearing adjustment, axle alignment, Turbo brake and caliper repair, steering-gear assembly, floor/frame control dimensions, rear axle-tube work, engine-lid service, and automatic heating-control diagnosis.
• Electrical reference material supplies Turbo current-flow diagrams for Models 76, 77, and 78 and multi-sheet circuit diagrams for Models 86 through 89, with additional circuits for automatic heat, air conditioning, power windows, rear wiper, headlight washers, fog lights, engine-compartment lighting, and the alarm system.

Model, Market, and Drivetrain Coverage

The 3.0-liter data distinguishes engine types 930/50, /51, /52, /53, and /54. The 3.3-liter material covers 930/60, /61, /62, /63, /64, /65, /66, and /68, with separate CIS and ignition specifications for Europe, the USA, California, Japan, Sweden, and Canada. These divisions matter when selecting control-pressure tests, idle and CO data, ignition curves, exhaust layouts, and emission-control procedures.

Four-speed coverage separates transmissions 930/30, 930/32, 930/33, and 930/34, including the non-US 930/32 and the changes introduced for 1977 and 1978. The G50/50 five-speed and its hydraulic clutch are identified for Model 89, but Porsche directs internal G50/50 maintenance to the Carrera Workshop Manual. Brake information also tracks production changes, including the front-hub grease-cap break at chassis No. 93 Z BS 000094 in October 1980 and the revised disc/hub arrangement used from the 1981 model year.

Factory Tools and Repair Cautions

Tool references are tied to the work rather than presented as a generic list. Examples include fuel-pressure gauge P 378 with adapter P 9114, boost-pressure tester 9103 and 3.3-liter adapter 9103/1, clutch tools 9102 and P 201 a, rear-suspension tools P 289 and P 297 a, and body gauges P 683 a/P 863 with straightening attachment set ENS 77.303.

The manual warns that the P 289 holder must be updated to suit later rear-axle configurations; using it unchanged can damage the light-alloy trailing arms. It also cautions against leaving the CIS adjusting wrench in the mixture-control unit while the engine is accelerated, since the unit can be severely damaged.

Diagrams and Technical Reference Data

Named illustrations include the Turbocharger Oil Supply drawing, engine-type-specific Exhaust System Layout views, Europe/USA/Japan/California hose-connection plans, the Floor/Frame Assembly Drawing, 1976–1978 Turbo current-flow diagrams, and multi-sheet circuit diagrams for Models 86–89. The later electrical pages combine shared 911 Carrera circuits with Turbo-specific sheets, so the vehicle and model-year headings remain important when tracing a fault.

Reference sections provide component-specific torque tables, adjustment and wear limits, piston/cylinder and crankshaft sizing data, fuel- and boost-pressure test specifications, ignition and CIS settings, wheel-alignment values, brake test data, lubricant and capacity information, and electrical test values. Fuel, CDI ignition, brake-hydraulic, and refrigerant-system work should be carried out only with the correct workshop equipment and the factory safety precautions in place.