Chevrolet 91177756 Engine Coolant Pump

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On DOHC engines, it is recommended to drain the oil and remove the oil filter, as some water pump bolts are extremely difficult to reach with the oil filter installed. Drain the cooling system, and if the coolant is relatively new or in good condition, save it for reuse. Loosen the clamps and detach the hoses from the water pump; if they are stuck, grasp each hose near the end with adjustable pliers and twist to break the seal before pulling it off. If the hoses are deteriorated, cut them off and install new ones. Remove the cooling fan and shroud, followed by the drive belt(s) and the pulley at the end of the water pump shaft. On SOHC engines, remove all accessory brackets from the water pump, ensuring not to disconnect the hoses when removing the power steering pump and air conditioning compressor; tie the units aside with the hoses attached. Remove the timing belt and idler assembly on SOHC engines. For DOHC engines, disconnect the heater outlet hose, remove the heater outlet pipe bolt, and then remove the heater outlet pipe. Remove the water pump mounting bolts, noting the locations of various lengths and types for correct installation. Clean the bolt threads and threaded holes in the engine to remove corrosion and sealant. Compare the new pump to the old one to ensure they are identical, and remove all traces of old gasket material from the engine with a gasket scraper. Clean the engine and new water pump mating surfaces with lacquer thinner or acetone, then apply a thin coat of RTV sealant to the engine side of the new gasket and a thin layer to the gasket mating surface of the new pump. Carefully mate the gasket and the pump, slipping a couple of bolts through the pump mounting holes to hold the gasket in place. Attach the pump and gasket to the engine, threading the bolts into the holes finger tight, then install the remaining bolts, ensuring any accessory brackets are repositioned at this time. Tighten them to the specified torque without over-tightening to avoid distorting the pump, and finally, reinstall all parts removed for access to the pump.

A howling sound may be heard at the front of the engine if the fan or water pump shaft bearings fail.