Mercury F4AZ-8501-A Pump Assembly - Water

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To remove the water pump, start by disconnecting the cable from the negative battery terminal and draining the cooling system with the engine cold. If the vehicle has a fan shroud and fan assembly, remove them. Take off the drivebelt(s) and the water pump pulley. On OHV engines with the power steering pump bracket retained at the water pump, remove the power steering pump and bracket assembly. If the engine has air conditioning, remove the idler pulley and bracket assembly. Remove any accessory brackets attached to the water pump. On OHV engines, detach the lower radiator hose, heater hose, and bypass hose from the water pump. Remove the water pump retaining bolts and take out the water pump. Before installation, ensure all gasket or sealant material is cleaned from the water pump, cylinder front cover, or cylinder block. Inspect the O-ring and sealing surface of the water pump housing in the block for dirt and debris on OHC engines. Position new gaskets on OHV engine water pumps and coat them with RTV sealant on both sides. Lubricate a new O-ring seal with clean antifreeze and install it on OHC engine water pumps. Transfer hose ports and fittings from the old pump if necessary for OHV engine water pumps. Install the water pump, making sure to replace the gaskets and plate on OHV engines. Tighten the bolts to the specified torque. Attach the radiator hose, heater hose, and bypass hose on OHV engines. Install the remaining components in the reverse order of removal. Fill the cooling system with the proper coolant mixture and start the engine to check for leaks, monitoring the level during the first few weeks of operation.

Remove the fan shroud and the fan assembly. Remove the drive belt(s) and remove the water pump pulley.

Water pump failure can lead to engine overheating and serious damage.

If the water pump shaft bearing has failed, you should replace the water pump immediately.

With the engine cold, drain the cooling system to prepare for water pump removal.

A leaking weep hole in the water pump indicates a seal failure and coolant leakage.