Mercury F77Z-8501-AD Pump Assembly - Water

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Listen for a howling sound at the front of the engine while it is running. Additionally, check for noticeable shaft wear by rocking the pulley.

If there is a failure at the pump seal, coolant will leak from the weep hole(s) on the water pump. You can look for traces of coolant residue or dried coolant tracks around the weep hole(s) using a flashlight.

Yes. For those models, you should also: 1. Disconnect the negative battery cable and drain the cooling system. 2. Remove the cooling fan and shroud. 3. Remove the drive belt, pulley, and hoses from the water pump. 4. Proceed to remove the water pump from the engine. 5. Clean the bolt threads and threaded holes in the engine. 6. Compare the new pump to the old one and remove old gasket material. 7. Clean the engine and new water pump gasket mating surfaces with lacquer thinner or acetone. 8. Apply RTV sealant to the engine side of the new gasket and the gasket mating surface of the new pump. 9. Attach the pump and gasket to the engine, threading the bolts in finger-tight. 10. Install the remaining bolts, tighten them evenly in 1/4-turn increments, and reinstall any removed parts. 11. Refill the cooling system and check the drive belt tension before running the engine and checking for leaks.

To check the water pump's operation, with the engine at normal operating temperature, squeeze the upper radiator hose; if the water pump is functioning correctly, a pressure surge should be felt upon release. Inspect the water pump for leaks from its weep or vent holes, usually requiring a flashlight to locate from underneath. Detect water pump shaft bearing failure by a howling sound at the front of the engine while running, accompanied by noticeable shaft wear if the pulley is rocked. When replacing the water pump, start by disconnecting the negative battery cable, draining the cooling system, and removing the cooling fan and shroud. Loosen water pump pulley bolts, remove the drivebelt and pulley, and disconnect hoses. If necessary, remove the alternator and its bracket. Detach the water pump from the engine, clean surfaces, compare the new pump to the old one, remove old gasket material, and apply RTV sealant to both gasket surfaces. Carefully attach the pump and gasket to the engine, tightening bolts without distortion. Reinstall all removed parts, refill the cooling system, check drivebelt tension, and run the engine while checking for leaks.

Remove the thermostat housing, then proceed to remove the bolts in reverse order.

If issues arise, replacing the water pump is necessary.

A failure in the water pump can cause serious engine damage due to overheating. If a failure occurs in the pump seal, coolant will leak from the front cover in V6 models or the water pump housing in V8 models. The water pump on V6 engines is mounted in the front cover and on V8 engines in a water pump housing in the engine block. Water pumps are equipped with weep or vent holes. It is possible to check the water pump weep hole using a flashlight. If a failure occurs in the pump seal, coolant will leak from the hole. Use the flashlight to find the vent hole on the water pump and check for leaks. Some small black staining around the weep hole is normal. If the stain is heavy brown or the actual coolant is evident, replace the pump. If the water pump shaft bearings fail, there may be a howling sound near the water pump while it's running. With the engine off, shaft wear can be felt if the water pump pulley is rocked up and down. Don't mistake drivebelt slippage, which causes a squealing sound, for water pump bearing failure. A quick water pump performance check is to put the heater on. If the pump is failing, it won't be able to efficiently circulate hot water all the way to the heater core as it should.

Disconnect the cable from the negative battery terminal.