1972–1989 Porsche 911 Workshop Manual (P/N WKD 481 021)

• Combines the 1972-1983 Porsche factory workshop material (Printing No. WKD 481 021) with the 1984-1989 Carrera service volume in a 1,722-page PDF set; later coverage explicitly includes Coupe, Targa, and Cabriolet models.
• Covers engine removal and installation, crankcase and crankshaft service, piston and cylinder inspection, cylinder-head and camshaft work, cam timing, chain-tensioner overhaul, and lubrication-system repair.
• Details mechanical fuel injection, CIS/K-Jetronic diagnosis, oxygen-sensor control, and later DME/Motronic testing, including fuel-pressure checks, component tests, ECM harness measurements, and pin assignments.
• Distinguishes the 915, 925 Sportomatic, and G50 drivetrains, with clutch adjustment and replacement, shifter service, shaft and synchronizer work, seal replacement, and model-specific internal-repair limits.
• Includes front and rear suspension service, wheel alignment, steering diagnosis, brake hydraulic work and bleeding, Targa and Cabriolet top repair, sunroof service, heating, ventilation, and air-conditioning component replacement.
• Provides year-specific wiring diagrams, component-location views, troubleshooting charts, torque tables, capacities, wear limits, clearances, alignment data, and scheduled-maintenance references.

The two PDFs divide the model range at a meaningful mechanical break. The USA/Canada factory volume follows the 911 T, E, S, Carrera 2.7, and SC through the 1972-1983 period, including the 1983 Cabriolet. The later volume is specific to 1984-1989 3.2 Carrera cars and identifies 930/21 engines for 1984-1986 and 930/25 engines for 1987-1989. It also separates the cable-operated 915 clutch from the hydraulically operated G50 system. This set is suited to experienced owners for maintenance and minor repair, while internal engine, transaxle, alignment, brake, and electrical work assumes solid automotive repair skills and the specified measuring equipment or special tools.

Engine and Fuel-System Coverage

The early engine sections track the changes among 2.4-, 2.7-, and 3.0-liter builds instead of treating every air-cooled flat-six as interchangeable. They cover crankcase measurement and reconditioning, piston and cylinder matching, valve-spring installed length, camshaft timing, chain-tensioner repair, oil tanks and cooler circuits, clutch changes, emissions equipment, and model-specific tightening and inspection data.

Fuel-system depth extends from mechanical-injection pump and throttle-linkage adjustment to CIS checkout. The factory material includes system-pressure and leakage testing, injector checks, mixture-control unit service, warm-up regulator diagnosis, fuel-accumulator and auxiliary-air components, oxygen-sensor control, and year-specific vacuum layouts. For the 3.2 Carrera, the later volume adds DME fuel-delivery tests, injector and sensor checks, throttle-switch adjustment, idle-control diagnosis, oxygen-sensor circuits, ECM access, harness electrical tests, and DME pin assignments.

Drivetrain, Chassis, and Body Repair

The early transaxle material goes well beyond fluid service. It covers 915 and 925 Sportomatic removal, disassembly and assembly, shift-fork adjustment, oil-pump-equipped gearbox service, input and pinion shafts, synchronizers, differential work, and ring-and-pinion setup. The 1984-1989 volume documents 915 shifter, case, gear, shaft, and synchronizer repair, plus cable-clutch procedures. It covers G50 shifter service and hydraulic-clutch bleeding, adjustment, cylinder replacement, pedal-cluster work, and clutch replacement, but does not include an internal G50 overhaul. Its differential chapter is limited to diagnosis and axle-flange seal replacement rather than complete differential disassembly.

Chassis coverage includes the early self-leveling hydropneumatic front struts, conventional struts and torsion-bar suspension, control arms, axle shafts, CV joints, wheel bearings, steering, and front/rear alignment. Brake chapters cover boosters, master cylinders, calipers, hard lines and hoses, parking brakes, system troubleshooting, flushing, and pressure, vacuum, or manual bleeding. Body material addresses Targa roof adjustment, the 1983 Cabriolet top and canvas components, later manual and powered convertible tops, sunroof drives and cables, windows, trim, seats, bumpers, and body reference dimensions.

The air-conditioning section supports compressor, receiver/drier, condenser, evaporator-housing, blower, and control-component replacement. Refrigerant discharge, evacuation, and recharge procedures are expressly outside its scope.

Schematics, Specifications, and Repair Cautions

Representative illustrations include the oil-cooling circuit schematic, CIS fuel-system schematic, 915/925 transmission power-flow views, DME engine-management diagrams, year-specific power and ground distribution diagrams, and convertible-top circuits. Special-tool references include the P 9191 camshaft holder, 9182 chain-tensioner preloader, P 228 c linkage protractor, and VW 385 transmission setting gauge.

The repair cautions are component-specific. The factory timing section warns that levering against the chain-tensioner housing can deform it and seize the piston; the specified preloading tool avoids that damage. On oil-pump-equipped transmissions, incorrect routing of the pressure line or failure to engage the front-cover coupling pin can pinch components or interrupt lubrication.

Brake, fuel, high-voltage ignition, refrigerant, and under-car work require proper vehicle support, pressure relief, electrical isolation, and suitable protective equipment. Read the applicable procedure and warnings in full before beginning a repair.