1986 GMC K2500 Suburban Service and Repair Manual

This factory service and repair manual for the 1986 GMC K2500 Suburban covers the four-door sport utility with either of two overhead-valve V8s, the 6.2L diesel and the 5.7L gasoline engine, neither of them turbocharged. Trims run Base, High Sierra and Sierra Classic. With the mechanical choices this narrow, most of what varies from one vehicle to the next is equipment and wiring rather than driveline, and the diagrams carry as much of the load as the engine specifications do.

Engines covered

• 6.2L V8 (379 cu in) — OHV, naturally aspirated, diesel
• 5.7L V8 (350 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• 4-door sport utility

Trims covered

• Base
• High Sierra
• Sierra Classic

Known issues on the 1986 K2500 Suburban. One recall reaches this model year, and it concerns replacement oil filters sold for trucks of this era: poor sealing can let engine oil escape, and oil on a hot surface can start a fire. Five owner complaints are logged with NHTSA, two on the suspension, one on the fuel system and one on equipment. Suspension and fuel system work carries torque values and specifications here, and the engine diagnostics cover a loss of oil pressure.