HIGH EXTERIOR DOOR KEY LOCK EFFORT

VEHICLES AFFECTED: 1986 S/T Trucks Equipped With Power Door Locks

High exterior key lock effort or interior manual lock effort may be encountered on some 1986 S/T trucks equipped with power door locks. This high effort may be caused by a binding condition between the lock lever assembly bell crank and the power door lock motor. This condition can be eliminated by rotating the door lock motor forward as described in the following procedure:

Power Door Lock Motor Adjustment Procedure

o Remove the door inner trim panel.

o Remove the top three fasteners on the door insulator pad. Pull the insulator pad down and secure with a piece of tape.

o Put lock in unlocked position.

o Loosen the two door lock motor mounting screws. (Ref: Figure No . 1)

o Rotate the power lock motor all the way forward (toward the front of the door) and retorque mounting screws to 9 N.m (80 in. lbs.). (Ref: Figure No. 1)

o Check to ensure that the binding condition has been eliminated by feeling the connection between the power door lock motor and the bell crank while operating the manual locks. If the binding condition still exists, enlarge the motor assembly mounting holes as required to relieve any binding that may occur.

o When the adjustment has been completed, reposition the door insulator and reinstall the door trim panel.

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.