Description

Porsche 928 1977 Workshop Manual

You have a 928 on the lift and the owner says it runs rough. You pull out some aftermarket CD and find generic specs that don’t match the Bosch injection tuning. That is when you wish you had the factory book. This one – original Porsche 928 1977 Workshop Manual – came from the dealer network in Stuttgart. 323 pages of what Porsche told its own techs to do. No abbreviations for critical bolt torques, no missing wiring pinouts.

Why This 323-Page Manual Beats Aftermarket Copies

Aftermarket manuals copy the table of contents and then fill in with generic data from other models. That gets you a rod bolt torque that belongs on a VW Beetle. Porsche engineers wrote each repair group for the 928 specifically. Group 17 covers cylinder head and valve drive with the exact tightening sequence and angles. Group 26 handles the air flow controlled fuel injection – no other manual gives you the factory test pressures for the warm-up regulator. Those 323 pages were printed in Germany in 1977 and updated through 1988. Every spec is for this car.

3 Sections That Save You From a Blown Engine

Engine, crankcase, and pistons live in Group 13. Crankshaft and pistons in Group 15. Cylinder head in Group 17. Each one has the torque values you need. Skip the head bolt sequence and you warp the deck. The manual gives the steps and the angles. Lubrication in Group 19 includes oil pump clearances. Cooling in Group 20 has thermostat specs. Fuel supply Group 24 and injection Group 26 – that is where most aftermarket manuals fall apart. The factory book shows the complete CIS system with pressures at every port. Blown engine avoided.

What Torque Values Are Listed?

Every fastener critical to drivetrain safety. Wheel lug nuts, suspension bolts, brake caliper bolts, engine mount bolts, transmission case bolts, differential cover bolts. The manual lists them in Newton-meters but you can convert to ft-lb. For example, the cylinder head bolts – you need the sequence from Group 17. The manual does not give you a single number; it gives a multi-step tightening procedure. Torque matters. Do not guess. Use the factory number from this manual.

Safety Notes and Special Tools: Page 50-05

Body repairs start on page 50-01 with special tools and shop materials. Page 50-03 has repair dimensions. Page 50-05 has safety notes. That page tells you about welding around fuel lines, handling foam-filled cavities, and using the correct sealers. If you are replacing a rocker panel (Group 51) or a quarter panel end (Group 53), you need those safety notes. The manual also lists the factory tool numbers for pulling dents and aligning panels. Body repairs to foam-filled cavities on page 53-7 – that procedure is not in any aftermarket book. You get the exact drill pattern and injection method.

Understand the Wiring Before You Touch It

Electrics start at Group 90: instruments, fuel gauge, alarm system. Group 91 radio. Group 92 wipers and washer. Group 94 exterior lights. Group 96 interior lights. Group 97 wiring. The wiring diagrams in Group 97 are full schematics with color codes and connector pin numbers. If you are troubleshooting a no-start, you need the power supply and ignition system (Group 27 and 28). The manual shows the starter circuit, cruise control, and all grounds. Aftermarket wiring books often merge multiple models into one drawing. This manual is 928-specific. Use the wiring section to avoid shorting the K-Jetronic control unit.

Audience Fit: Who Needs This Manual

DIY mechanics who own a 928 and want to keep it original. Home garage enthusiasts who refuse to pay dealer prices for a diagnostic that the manual already explains. Beginners who are willing to read the procedure before turning a wrench – this manual assumes you have basic mechanical sense, but it does not hold your hand. It expects you to follow the torque specs and the sequence. If you are a professional shop, this manual saves you the call to the dealer parts counter for a spec that is printed on page 0.1 of the Technical Data. Every repair group is indexed at the front. You can find the transmission section (Groups 30-39) including manual and automatic, differential, and transaxle. For the complete list of repair groups, see the Porsche 928 Workshop Manual – Section: Repair Groups in the PDF bookmarks.

Does this manual cover the automatic transmission?

Yes, Groups 37 and 38.

What about the fuel injection system?

Group 26 covers the Bosch CIS fuel injection. That includes air flow control, pressure regulator, cold start valve, all with OEM test procedures and specifications. If you are chasing a no-start or lean condition, that section alone justifies the purchase because aftermarket manuals skip the factory diagnostic tree.

Related manuals you might need: Porsche 928 Workshop Manual is the base. If you need transmission specifics for a later model, check Porsche 911 Carrera 4 & Carrera 2 1995 Workshop Manual Vol 2 Transmission. For broader context on how Porsche engineering fits into the Automotive Industry Overview, this manual shows it. Also compare the Manual Transmission section in the 928 manual – Group 35 covers gears and shafts with factory tolerances.

Stop wasting time with aftermarket reprints that leave out the critical steps. Access the Factory Manual and get the exact data Porsche intended for its technicians. Your 928 deserves that precision.