Toyota 16100-49755 Engine Water Pump Assembly

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Disconnect the cable from the negative terminal of the battery. Caution: If the stereo in your vehicle is equipped with an anti-theft system, detaching the cable. Drain the coolant. Loosen the alternator pivot nut and the power steering pump nut, then pivot the alternator and the power steering pump in towards the engine so that the drive belts are slack. Turn the air cleaner assembly housing up out of the way. Disconnect the upper radiator hose. Remove the four fan shroud bolts. Remove the fan clutch unit. Also remove the water pump pulley and (if equipped) belt guide. Remove the bolts/nut(s) which secure the water pump unit to the front of the engine. Place a pan under the water pump to catch any remaining coolant, then pull off the water pump and gasket. If it's stuck, tap it gently with a wood hammer handle. If you plan to reuse the same pump, do NOT strike it with a metal object. Remove all traces of old gasket material and sealant. The gasket mating surfaces of the pump and block (or pump body on 1979 through 1981 models) must be free of old gasket material, or the pump may leak - but be careful not to gouge the mating surfaces when scraping off the old gasket material. The gasket mating faces of the pump and the pump body (1979 through 1981 models) or the engine block (1982 and later models) must be spotless or they'll leak. Installation is the reverse of removal. Be sure to use a new gasket and tighten the bolts and nut(s) securely. Adjust the drivebelt tension. If the belt is too tight, it will put a strain on the water pump and alternator bearings. If the belt is too loose, it will slip and wear rapidly, causing possible engine overheating and low alternator output. Add coolant. Connect the cable to the negative terminal of the battery. Start the engine and check the water pump and hoses for leaks.

There are three ways to check the operation of the water pump while it is installed on the engine.