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In the lower unit or gearbox
picture on how to replace a water pump for mercury topaz
how is the best way to remove water pump from 1997 mercury cougar 4.6 engine
The water pump is bolted to the front of the engine behind the engine cooling fan
what is the engine?
Most likely head gaskets or cracked water jacket.
On a 1997 Mercury Mountainer , 5.0 liter V8 engine : The water pump is bolted to the front of the engine , behind the engine cooling fan ( just follow the bottom radiator hose , it connects to the water pump )
The mercury switch installed on your engine is designed to short out the ignition to ground when the engine is tilted out of the water. The intended purpose is as a safety feature in the event of striking an under water obstruction during operation.
Blown head gasket or cracked head.
The water pump impeller on a 7.5 hp Mercury outboard, is located on top of the gearcase, and is driven by the driveshaft.
A Mercury outboard water pump is a engine cooling system. A outboard water pump is what blows steam through to get the car cool,
Depends on the make and model of the engine, not the truck.