Toyota 16110-19105 Water Pump Assembly W/O Coupling

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It is important not to mistake drive belt slippage, which causes a squealing sound, for water pump bearing failure.

To remove the water pump, start by disconnecting the battery cable from the negative terminal and draining the cooling system if the coolant is still in good condition. Then, remove the right-hand splash shield and the High Altitude Commentator (HAC) valve if applicable. Take off the accessory drive belt and the intake manifold brace, making sure to remove the Air Suction (AS) valve first on certain models. Remove the oil pan dipstick and disconnect the water by-pass on carbureted models. Take off the hoses from the inlet pipe and remove the mounting bolt to detach the pipe from the water pump. Remove the alternator and adjusting bar, and check the water pump by-pass pipe for leaks. If necessary, unbolt the clamp and replace the O-ring or hose. Finally, remove the water pump by removing the bolt and two nuts, gently tapping it if it's stuck. For installation, clean the sealing surfaces, install a new O-ring on the inlet pipe, and apply soapy water to the O-rings for assembly. Apply gasket sealant to the water pump groove and install the pump with the bolt and nuts, being careful not to overtighten. Reinstall all the previously removed parts and refill the cooling system, checking for leaks while running the engine.