This factory service and repair manual for the 1994 GMC P6500 was written around the P6S042 and the three engines that could be ordered under it: the 366 cubic inch 6.0L gasoline V8, the 427 cubic inch 7.0L gasoline V8 and the turbocharged 403 cubic inch 6.6L diesel inline-six, all of them overhead-valve designs. Two fuels and two very different service routines end up in one volume, and the procedures, specifications, torque values, wiring diagrams and diagnostics are kept separate by engine so they do not get mixed.
Engines covered
- 6.0L V8 (366 cu in) — OHV, naturally aspirated, gasoline
- 7.0L V8 (427 cu in) — OHV, naturally aspirated, gasoline
- 6.6L inline-six (403 cu in) — OHV, turbocharged, diesel
Trims covered
- P6S042
Known issues on the 1994 P6500. The 1994 P6500 has a clean federal record, with neither recalls nor owner complaints against it. What matters instead is having correct data for a truck this old, and the manual carries it: torque values for the 366 and 427 cubic inch V8s and the 403 cubic inch diesel, injection and turbocharger service procedures, brake and steering specifications, and wiring diagrams with the diagnostic routines that go with them.
