1991 GMC C7000 Topkick Service and Repair Manual

This factory service and repair manual for the 1991 GMC C7000 Topkick deals with three engines and one chassis. The engines are two naturally aspirated OHV gasoline V8s, the 7.0L and the 6.0L, plus a turbocharged 6.6L OHV inline-six diesel. The chassis is the two-door conventional cab and chassis, ordered as either C7H042 or C7H064, and it was the only configuration listed for the year. Each engine is set out on its own for specifications, torque values and diagnostic procedures.

Engines covered

• 7.0L V8 (427 cu in) — OHV, naturally aspirated, gasoline
• 6.6L inline-six (403 cu in) — OHV, turbocharged, diesel
• 6.0L V8 (366 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• 2-door cab & chassis, conventional

Trims covered

• C7H042
• C7H064

Known issues on the 1991 C7000 Topkick. The manual is a maintenance and repair reference. It gives procedures, specifications, torque values, wiring diagrams and diagnostics for the 6.0L and 7.0L gasoline V8s and for the turbocharged 6.6L diesel inline-six, together with the cab-and-chassis structure that carries all three.