Toyota 16100-59275 Engine Water Pump Assembly

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Water pump failure can cause engine overheating and damage. All pumps have a weep hole and a vent hole; if coolant leaks from these, replace the pump. On V6 models, use a flashlight to locate the holes behind the pulley below the pump shaft. On V8 models, the pump is behind the timing belt cover and leaks will emerge from the bottom cover. If the pump shaft bearings fail, a howling sound may be heard from the engine, and bearing wear can be detected by rocking the pump pulley.

Disconnect the cable from the negative terminal of the battery. Drain the cooling system. Remove the engine splash shield. Remove the engine cooling fan. Remove the upper and lower radiator hoses. For V6 models, remove the engine cover and air filter housing. Remove the water inlet assembly, idler pulleys, alternator, air conditioning compressor, and drivebelt tensioner. Remove the water pump mounting bolts and clean the gasket mating surfaces. Install a new gasket and water pump, and a new O-ring on the water pump. Install the water inlet assembly with new O-rings. The remainder of installation is the reverse of removal. Refill the cooling system, run the engine, and check for leaks. For V8 models, remove the timing belt. Disconnect the bypass hose from the water inlet assembly and remove the water inlet. Remove the water pump mounting bolts and separate the pump from the engine block. Remove the O-ring from the coolant bypass pipe and replace it. Install a new gasket and water pump. Thoroughly clean the gasket surface of the water inlet assembly. Install a new O-ring and apply RTV sealant to the groove on the water inlet assembly. Install the water pump within five minutes of sealant application. The remainder of installation is the reverse of removal. Refill the cooling system, run the engine, and check for leaks.

gasket is included