The water pump pulley may separate on some 1985 'N' Series vehicles equipped with the 2.5L engine (VIN Code U).
The separation may be noticed in the spot welding area which attaches the two pulleys or a fracture at the hub weld joint.
New pulleys, Part No. 10042037, are available through WDDGM.
Water pump bearing assembly should not be replaced unless damaged.
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.