1986 GMC General Service and Repair Manual
This factory service and repair manual for the 1986 GMC General has six diesels to keep straight, the 7.0L inline-six of 426 cubic inches, the 9.0L V6 of 552, the 12.1L V8 of 736 and the turbocharged 10.0L, 14.0L and 14.6L inline-sixes. Bodywork splits between straight trucks in long and medium conventional form and tractors in medium conventional, long conventional and low tilt form, across six build codes. Coverage is by system.
Engines covered
- 14.0L inline-six (855 cu in) — turbocharged, diesel
- 9.0L V6 (552 cu in) — diesel
- 12.1L V8 (736 cu in) — diesel
- 14.6L inline-six (893 cu in) — turbocharged, diesel
- 10.0L inline-six (611 cu in) — turbocharged, diesel
- 7.0L inline-six (426 cu in) — diesel
Body styles covered
- Straight truck, long conventional
- Straight truck, medium conventional
- Tractor truck, low tilt
- Tractor truck, medium conventional
- Tractor truck, long conventional
Trims covered
- N9E020 Gliders - Medium Conventional
- N9E042
- N9E064
- N9F020 Gliders - Long Conventional
- N9F042
- N9F064
Known issues on the 1986 General. NHTSA holds no recall against the 1986 General, and owners have filed no complaints about it either. The manual therefore stands on its own content, which means engine specifications and repair procedures for each of the six, from the 7.0L inline-six up to the turbocharged 14.6L, torque values for frame and driveline fasteners, wiring diagrams for the cab and chassis, and diagnostics that follow the same system order whichever body configuration and build code the truck in the shop carries.
A CLAMP PINCH BOLT SECURING THE UPPER STEERING SHAFT TO THE LOWER STEERING SHAFT MAY LOOSEN.
REPLACE THE CLAMP ASSEMBLY AND UPPER STEERING SHAFT.
THE THROTTLE RETURN SPRING ASSEMBLY MAY FAIL AND PREVENT THE THROTTLE FROM RETURNING TO THE CLOSED (IDLE) POSITION WHEN THE ACCELERATOR PEDAL IS RELEASED.
REPLACE ACCELERATOR LINKAGE RETURN SPRING(S).
