Toyota 16100-39455 Engine Water Pump Assembly

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Non-toxic coolant is available at local auto parts stores. Although the coolant is non-toxic when fresh, proper disposal of used coolant is still required. For a four-cylinder engine, start by disconnecting the negative battery cable and draining the cooling system. Then, remove the engine movement control rod and its bracket, as well as the #2 engine stay and bracket. Take off the drivebelt and the alternator, followed by the water pump pulley. Remove the four bolts and two nuts to pry the water pump off, tapping it loose if necessary. Clean the water pump and block, apply a new bead of sealant, and install the water pump. Finally, refill the cooling system, run the engine, and check for leaks and proper operation. For a V6 engine, begin by disconnecting the negative battery cable and draining the cooling system. Remove the timing belt and camshaft sprockets, then take off the water inlet pipe and thermostat. Remove the number 3 timing belt cover and the water pump retaining bolts/nuts to separate the pump from the engine. Thoroughly clean all sealing surfaces and install a new metal/rubber gasket. Reinstall the pump and the remaining parts, tightening the water pump bolts/nuts in several steps. Refill the cooling system and run the engine, checking for leaks and proper operation.

A failure in the water pump can cause serious engine damage due to overheating. To check if the water pump is working properly, with the engine running and warmed to normal operating temperature, squeeze the upper radiator hose. A pressure surge should be felt as the hose is released if the water pump is functioning correctly. 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. A slight gray discoloration around the weep hole is normal, while dark brown stains indicate a problem. 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 drive belt slippage, which causes a squealing sound, for water pump failure. Spray automotive drive belt dressing on the belts to eliminate the belt as a possible cause of the noise.