GENERATOR BELT TENSIONING CS-121, CS-130 AND CS-144

FIREBIRD, GRAND AM, AND FIERO MODELS

Some models of the above vehicles are equipped with CS-121, CS-130, or CS-144 Delcotron Generators and without automatic belt tensioning equipment. On these applications, the generator belt tension is adjusted by forcing the generator against the belt until the vehicle manufacturer's belt tension specification is reached. When adjusting the belt tension for a CS-Generator in this manner, it is important that the force be applied properly to avoid damaging the generator.

As with several other Delcotron models, the CS-Series housing includes an adjustment lug on the drive end frame (see illustration) which should be used to push the generator against the belt while the adjustment bolt is tightened. A 3/4" wrench (or equivalent) should be used when holding the generator by this lug.

If the vehicle configuration does not permit use of the adjustment lug, pressure may be applied to the side of the drive end frame to tighten the belt. If pressure cannot be applied directly to the drive end frame, a block of wood should be inserted between the prying instrument and the side of the generator to distribute the force to a wider area which includes the drive end frame. Do not pry directly against the stator or slip ring end frame.

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.