WATER PUMP USAGE SHEET METAL IMPELLOR

MODELS AFFECTED: 1978-1984 - ALL MODELS EXCEPT CIMARRON

Water pump package No. 556283 available from GMWDD, now contains a pump with a sheet metal impellor. This pump is also being used on production engines.

Serviceman Bulletin No. 81-63, File Group 6A, Number 16, defined criteria for the cast iron impellor. It must have square vanes and .045 inch clearance. It is no longer necessary to be concerned about this if a new pump with the sheet metal impellor is used.

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.