1969–1973 Porsche 911 T, E, & S Factory Workshop Manual (P/N WKD 481 021)

This 1,005-page PDF contains Porsche's factory Workshop Manual 911 - From Model 1972 On, Printing No. WKD 481 021, for 911 vehicles sold in the USA and Canada. The publication was maintained as a supplement set to Workshop Manual Volumes I and II, so its pages are organized by assembly group and model-year change rather than as one continuous overhaul sequence. Core powertrain and chassis updates run through the 1981 911 SC; the compiled file also contains USA 1982 911 SC current-flow diagrams and a 1983 Cabriolet-top repair section.

• Model and engine coverage: 911 T, E, S, Carrera 2.7, selected Carrera 3.0 engine and transmission data, and 911 SC configurations with 2.4-, 2.7-, and 3.0-liter specifications. The SC material separates the 930/04 and California 930/06 engines for 1978, the 930/07 for 1980, and the 930/16 for 1981.
• Engine and clutch work: Year-specific oil-tank and oil-cooler layouts, emission-system cross-sections, fan-belt and exhaust/heater-blower service, air-injection and EGR checks, 2.7-liter Nikasil cylinder updates, chain-tensioner overhaul, camshaft timing, piston and cylinder measurement, crankcase reconditioning, crankshaft and connecting-rod specifications, clutch adjustment, and release-bearing replacement.
• Fuel and emissions diagnosis: Mechanical fuel-injection pump adjustment, the 1973 911 T CIS, later CIS pressure and leakage testing, control-pressure regulator and mixture-control-unit service, fuel-line bleeding, fuel and vacuum line layouts, and 1981 oxygen-sensor, frequency-valve, throttle-switch, and CO-adjustment procedures.
• Transmission and final drive repair: Type 915 manual and Type 925 Sportomatic removal and internal disassembly, front-cover oil-pump work, selector-fork and synchronizer adjustment, input- and pinion-shaft service, Sportomatic clutch and control-valve checks, differential overhaul, and ring-and-pinion setup.
• Chassis and body systems: Koni self-leveling front struts, front and rear wheel alignment, the Carrera 2.7 aluminum crossmember, rear control arms and driveshafts, brake-booster and master-cylinder service, shift and pedal controls, body repair dimensions and straightening fixtures, Targa and hardtop service, and the later Cabriolet top.
• Electrical and reference material: Wiring and current-flow diagrams spanning the 1972 T, E, and S through the USA 1982 911 SC, plus starter, lighting, wiper/washer, electronic speedometer, seat-belt warning, automatic heating, cruise control, alarm, and ignition-distributor sections, together with torque tables, wear limits, capacities, and maintenance schedules.

Factory Supplement Scope

The manual's stated coverage begins with the 1972 model. It does contain isolated retrofit or adjustment notes for earlier cars - such as 1969-on spoiler or driveshaft applications and 1970-on Targa-roof work - but those pages do not make this a complete 1969-71 repair manual. Likewise, scattered 930/Turbo references concern shared body or equipment notes and do not replace a dedicated Turbo powertrain manual.

That supplement format matters during a repair. Porsche assumes the reader understands basic workshop practice, identifies special tools where required, and often records only what changed for a particular model year. For unchanged baseline operations, Volumes I and II remain part of the factory documentation chain.

Repair Procedures, Drawings, and Reference Data

The fuel-system chronology makes model-year selection clear. The 1972 pages address injection-pump and throttle-linkage changes; January 1973 production introduces CIS on the 911 T; later sections track revised control-pressure, vacuum, and emissions equipment; and the 1981 SC adds oxygen-sensor control and frequency-valve testing. California reactor and EGR configurations are separated where the hardware differs.

Representative factory drawings include the oil-circuit schematic, 1980 emission-control layout, CIS fuel and vacuum line diagrams, Type 915 and Sportomatic power-flow views, the Koni hydropneumatic-strut cross-section, and year-specific current-flow diagrams. Transmission setup uses Porsche special tooling and the VW 385 universal setting-gauge system; chain-tensioner work calls out tool 9182.

The manual also records repair traps tied to actual component damage. It warns that preloading the timing chain with a screwdriver can deform the chain-tensioner housing and seize the piston. It also cautions against hammering the rear wheel hub into the double-row bearing because the bearing can be damaged.

Component-specific tightening data, pressure-test and adjustment specifications, inspection limits, bore and piston dimensions, capacities, weights, performance data, service schedules, and lubrication schedules are distributed through the relevant groups. CIS pressure tests and emissions work require controlled fuel handling and proper ventilation. Transmission removal and body repair work require suitable lifting, support, and anchoring equipment.