HEAD BOLT TORQUE INCORRECT IN SERVICE MANUAL

VEHICLES AFFECTED: 1986 LIGHT AND MEDIUM DUTY TRUCKS WITH THE 6.0L, 7.0L AND 7.4L ENGINES

If it becomes necessary to remove and reinstall the cylinder heads from a 1986 6.OL, 7.OL, or 7.4L engine, the torque for the cylinder head bolts listed in the service manuals 130 N.m (95 ft. lbs.) is incorrect. The correct torque for these bolts is 110 N.m (80 ft. lbs.).

It is important for each dealer to correct their service manuals in order to reflect this change.

Light Duty Service Manual - Pagg 6A6-33

Light Duty Unit Repair Manual - Page 6A5-44

Medium Duty Unit Repair Manual - Page 6A3-60

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.