1986 GMC C6000 Service and Repair Manual

This factory service and repair manual for the 1986 GMC C6000 lists four engines: three gasoline and one diesel. The gasoline choices are the 6.0L overhead-valve V8 of 366 cubic inches, the 5.7L V8 of 350 cubic inches and the 4.8L overhead-valve inline-six of 292 cubic inches; the diesel is the naturally aspirated 8.2L V8 of 501 cubic inches. Both listed body styles, the 2-door conventional cab and chassis and the medium conventional tractor truck, fall under trim code C6D042, and the book documents each system for all four engines.

Engines covered

• 6.0L V8 (366 cu in) — OHV, naturally aspirated, gasoline
• 5.7L V8 (350 cu in) — naturally aspirated, gasoline
• 4.8L inline-six (292 cu in) — OHV, naturally aspirated, gasoline
• 8.2L V8 (501 cu in) — naturally aspirated, diesel

Body styles covered

• 2-door cab & chassis, conventional
• Tractor truck, medium conventional

Trims covered

• C6D042

Known issues on the 1986 C6000. Specifications and service procedures are given for each of the four engines, the diesel included; the tractor and cab-and-chassis versions get their own chassis procedures; and wiring diagrams and diagnostic routines cover the electrical side of both. It is the reference a shop needs when a truck this old has no factory support left behind it.