Toyota 16100-09070 Engine Water Pump Assembly

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Timing belt and idler pulleys, alternator adjusting bar, and lower radiator hose.

Yes, proper disposal of used coolant is still required.

Drive belt slippage causes a squealing sound, which should not be mistaken for water pump failure. To eliminate the belt as a possible cause of the noise, you can spray automotive drive belt dressing on the belts.

Start by disconnecting the negative battery cable and draining the cooling system.

To remove the water pump on 4-cylinder models, first disconnect the negative battery cable and drain the cooling system. Then, remove the timing belt and idler pulleys, alternator adjusting bar, and lower radiator hose. Remove the bolts from the water pump, noting their locations, and remove the pump and gasket. Thoroughly clean all sealing surfaces. To install, use new O-rings and gaskets, and tighten the bolts to torque specifications. Refill the cooling system and check for leaks. For V6 models, follow similar steps, but also remove the timing belt and camshaft sprockets, water inlet pipe and thermostat, and number 3 timing belt cover. Thoroughly clean all sealing surfaces and use a metal and rubber gasket for installation. Refill the cooling system and check for leaks.

A failure in the water pump can lead to engine damage due to overheating. To check if the water pump is working properly, squeeze the upper radiator hose while the engine is running and warmed to normal operating temperature. A pressure surge should be felt as the hose is released. Water pumps have weep or vent holes, and if there is a failure in the pump seal, coolant will leak from this hole. To find the hole in the water pump, use a flashlight to look 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. However, 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.

Squeeze the upper radiator hose while the engine is running and warmed to normal operating temperature. A pressure surge should be felt as the hose is released.

Non-toxic coolant can be purchased at local auto parts stores.

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. 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 drivebelt 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.

Dark brown stains around the weep hole indicate a problem with the water pump.