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

Porsche’s Workshop Manual 911 — From Model 1972 On, P/N WKD 481 021, documents USA and Canada applications for the 911 T, E, S, Carrera 2.7 and SC, with selected Carrera 3.0 data. Organized by assembly group and model-year revision, it supplements Workshop Manual Volumes I and II. Powertrain updates extend through the 1981 SC; later material includes USA 1982 SC wiring diagrams and 1983 Cabriolet-top repairs.

Coverage limit: Earlier-car retrofit and adjustment notes do not provide complete 1969–1971 repair coverage. Unchanged baseline procedures require Volumes I and II. Shared Turbo body and equipment references do not replace a dedicated Turbo powertrain manual.

PDF Bookmarks and Wiring Detail

Navigation and legibility: Embedded bookmarks provide access to assembly groups and individual procedures. PDF text search is unavailable. Small labels in later current-flow diagrams require zooming; some early wiring diagrams have broken lines and indistinct labels that remain difficult to read when enlarged.

The ZIP download contains one printable English-language PDF with 1,005 pages, including 32 cover, introductory, assembly-group divider and contents pages. The later wiring and Cabriolet-top material is already included in that total.

Engine, Injection, Drivetrain and Body Work

The following selected coverage highlights are not a complete contents list. Additional topics include collapsible spare-tire guidance and factory paint information.

• Engine and clutch: Step-by-step chain-tensioner overhaul, camshaft timing, piston and cylinder measurement, crankcase reconditioning, clutch adjustment, and release-bearing replacement.

• Fuel and emissions: Mechanical injection-pump adjustment, CIS pressure and leakage tests, mixture-control service, fuel-line bleeding, and oxygen-sensor control checks.

• Transmission and final drive: Type 915 manual and Type 925 Sportomatic disassembly, selector-fork and synchronizer work, shaft service, differential overhaul, and ring-and-pinion adjustment.

• Suspension and brakes: Koni hydropneumatic-strut checks, front and rear alignment, rear control-arm and driveshaft service, and brake-booster and master-cylinder work.

• Body and roof: Repair dimensions, straightening-bench fixtures, panel replacement, Targa and hardtop adjustments, and Cabriolet-top removal, fitting, and canvas-cover replacement.

• Electrical diagnosis: Model-specific wiring diagrams and tests for the starter, ignition distributor, electronic speedometer, seat-belt warning, automatic heating, cruise control, and alarm.

The manual assumes familiarity with basic automotive repair procedures and is suited to readers who can use the specified measuring equipment and Porsche special tools.

Engine Service and Model-Year Changes

Oil-tank locations, oil-cooler arrangements, fan-belt service, and exhaust and heater-blower work are separated by application. Engine sections cover Nikasil cylinder changes, cylinder-head and camshaft-housing sealing, and crankshaft and connecting-rod specifications.

The chain-tensioner instructions warn that using a screwdriver to preload the timing chain can deform the housing and seize its aluminum piston. The illustrated tooling includes assembly lever 9182.

Mechanical Injection, CIS and Emissions

The fuel sections distinguish the earlier injection-pump and throttle-linkage arrangements from the January 1973 introduction of CIS on the 911 T. Later sections address warm-up regulators, auxiliary-air devices, reactor and EGR equipment, and California-specific configurations.

Model-year pressure tables and fuel/vacuum layouts help match a test to the installed CIS equipment. The 1981 SC material adds frequency-valve testing, throttle-switch checks, acceleration-enrichment microswitch service, and CO adjustment.

Factory illustrations include the oil-circuit schematic, emission-control layout, CIS fuel/vacuum diagrams, transmission power-flow views, the Koni strut cross-section, and year-specific current-flow diagrams.

Transmission, Suspension and Body Repair

Transmission procedures extend to the front-cover oil pump, input and pinion shafts, and model-specific synchronizer changes. Sportomatic sections include clutch-play and control-valve checks; final-drive setup uses Porsche tooling and the VW 385 universal setting-gauge system.

Chassis information identifies the Carrera 2.7 aluminum crossmember and revised shift and pedal controls. Rear wheel-bearing instructions warn that hammering the hub into the double-row bearing can damage the bearing.

Body sections combine reference dimensions with Celette straightening-bench attachments and front/rear structural repair procedures. Roof coverage distinguishes Targa folding and hardtop arrangements from the later Cabriolet top.

Electrical Tests and Service References

Lighting, wiper/washer, charging-system changes, and ignition-distributor adjustment accompany the electrical troubleshooting sections. SC data distinguish the 930/04 and California 930/06 engines, followed by 930/07 and 930/16 applications.

Torque tables, inspection limits, capacities, weights, performance data, and maintenance and lubrication schedules appear in the relevant groups. Fuel-system and emissions testing call for controlled fuel handling and ventilation; transmission and structural body work require appropriate lifting, support, and anchoring equipment.

A Preview of Valve-Clearance and Heater-Sensor Data

For the 911 SC’s 930/16 engine, the specifications give cold intake and exhaust valve clearance as 0.10 mm, measured between the valve and rocker-arm adjusting screw.

Automatic-heating diagnosis specifies about 1.5 kΩ for the interior sensor at room temperature. The sensor in the heater-flap housing is specified at 135 Ω with the engine warm at 100°C (212°F).