P/S PULLEY CHANGE - BELT ROUTING -DIESEL ENGINE

FROM START OF PRODUCTION THROUGH APPROXIMATELY NOVEMBER 1, 1980, DIESEL ENGINE VEHICLES EQUIPPED WITH V08 (H.D. COOLING) USED A GENERATOR BELT THAT TRAVELED OVER THE CRANKSHAFT, WATER PUMP, POWER STEERING AND GENERATOR PULLEYS. THIS NECESSITATED THE USE OF A DUAL GROOVE PULLEY (P/N 559930) ON THE POWER STEERING PUMP. STARTING APPROXIMATELY NOVEMBER 1, 1980, ALL 1981 DIESELS WITH OR WITHOUT V08 (H.D. COOLING) USED ONLY THE STEP DRIVE GENERATOR BELT, I.E. GENERATOR BELT TRAVELS OVER WATER PUMP AND GENERATOR PULLEYS ONLY. THEREFORE, POWER STEERING PUMPS ON CARS WITH STEP DRIVE GENERATOR BELT, I.E. GENERATOR BELT TRAVELS OVER WATER PUMP AND GENERATOR PULLEYS ONLY. THEREFORE, POWER STEERING PUMPS ON CARS WITH STEP DRIVE GENERATOR WILL HAVE A SINGLE GROOVE PULLEY (P/N 22505005). G.M.W.D.D. (PARTS DIVISION) WILL CORRECT THEIR CATALOGS TO REFLECT THIS USAGE.

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.