1986 Chevrolet C30 Service and Repair Manual
This factory service and repair manual for the 1986 Chevrolet C30 keeps four engines and four bodies in play: the 4.8L inline-six, the 5.7L and 7.4L gasoline V8s and the 6.2L diesel, carried by a standard cab pickup, a four-door crew cab and cab-and-chassis versions with two or four doors. Custom, Scottsdale and Silverado are the trims. Front suspension and brake work dominate the hours on a truck like this, and those sections come with their own specifications, torque values and diagnostic sequences.
Engines covered
- 7.4L V8 (454 cu in) — OHV, naturally aspirated, gasoline
- 6.2L V8 (379 cu in) — OHV, naturally aspirated, diesel
- 4.8L inline-six (292 cu in) — OHV, naturally aspirated, gasoline
- 5.7L V8 (350 cu in) — OHV, naturally aspirated, gasoline
Body styles covered
- 2-door standard cab pickup
- 4-door cab & chassis
- 4-door crew cab pickup
- 2-door cab & chassis
Trims covered
- Custom
- Scottsdale
- Silverado
Known issues on the 1986 C30. Three recalls stand on the federal record. The most serious begins as a crack in the left lower control arm, spreading toward the ball joint mounting hole until the joint can separate from the arm and the driver loses control without warning. A second concerns a fuel tank that releases too much fuel in a frontal impact, where a fire can follow, and the third a replacement oil filter that may not seal. The one owner complaint names the engine and its cooling. Control arm, ball joint, fuel tank and lubrication work are all specified here.
TRUCKS FAILED TO COMPLY WITH REQUIREMENTS OF FMVSS 301, FUEL SYSTEM INTEGRITY, DURING A 30 MPH FRONTAL BARRIER TEST.
GREATER THAN ACCEPTABLE FUEL SPILLAGE DURING AND AFTER ACOLLISION COULD RESULT IN A FIRE.
INSTALL AN ADDITIONAL SHIELD TO THE FRONT OF THE ORIGINAL SHIELD TO PROTECT THE FUEL TANK.
ENGINE HAS BLOWN ON THREE OCCASIONS.
