Toyota 16100-69395 Engine Water Pump Assembly

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A failure in the water pump can cause serious engine damage due to overheating. With the engine running and warmed to normal operating temperature, squeeze the upper radiator hose. If the water pump is working properly, a pressure surge should be felt as the hose is released. Water pumps are equipped with weep or vent holes. If a failure occurs in the pump seal, coolant will leak from this hole. In most cases it will be necessary to use a flashlight to find the hole on the water pump by looking through the space behind the pulley just below the water pump shaft. If the water pump shaft bearings fail there may be a howling sound at the front of the engine while it is running. Bearing wear can be felt if the water pump pulley is rocked up and down. Do not mistake drivebelt slippage, which causes a squealing sound, for water pump failure. Spray automotive drivebelt dressing on the belts to eliminate the belt as a possible cause of the noise.

Four-cylinder engines, Disconnect the negative battery cable and drain the cooling system. Remove the power steering belt, alternator/water pump belt, and air conditioning belt. Remove the fan shroud from the radiator. Remove the fan assembly from the water pump. Remove the water pump pulley and disconnect the radiator inlet hose and bypass hose. Remove the bolts retaining the water pump to the engine block and remove the water pump. Thoroughly clean the gasket sealing surface on the timing chain cover. Installation is the reverse of removal. Be sure to use a new gasket and tighten the water pump bolts to the torque. Refill the cooling system, run the engine, and check for leaks. V6 engines: Disconnect the negative battery cable and drain the cooling system. Remove the timing belt. Remove the alternator adjuster bracket and bolt assembly and remove the thermostat housing and thermostat from the water pump. If the engine is equipped with an oil cooler, disconnect the number 2 oil cooler hose from the water pump. Remove the water pump bolts and separate the pump from the engine. Disconnect the radiator inlet hose and the bypass hose. Thoroughly clean the gasket mating surfaces, removing all traces of oil. Apply a 3 mm bead of ATV sealant to the water pump. Installation is the reverse of removal. Tighten the water pump bolts to the torque. Refill the cooling system, run the engine, and check for leaks.