Mercury FOAZ-8501-A Pump Assembly - Water

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To check a water pump, warm up the engine and squeeze the upper radiator hose. A pressure surge indicates a working pump. Look for coolant leaks from the pump's weep hole, which suggest immediate replacement to avoid shaft bearing failure. Listen for noise from the pump during operation, as this also indicates bearing failure and need for replacement. Check for bearing wear by trying to move the pump pulley; any movement means the pump should be replaced.

Install the water pump and tighten the bolts. On 5.0L engines, install the lower radiator hose, heater hose, and bypass hose to the water pump. Replace the hose clamps with new, if necessary. Install the remaining components to the water pump and engine in the reverse order of removal. Fill the cooling system with the proper coolant mixture. Start the engine and make sure there are no leaks. Check the level frequently during the first few weeks of operation to ensure there are no leaks and that the level in the system is stable.

Before installation, ensure all gasket or sealant material is cleaned from the water pump, cylinder front cover, or cylinder block.

Start the engine and warm it up to normal operating temperature. Then, squeeze the upper radiator hose. If the water pump is working properly, you should feel a pressure surge as the hose is released.