How Do You Test an Outboard Water Pump? On many outboards, you can simply put on the muffs and start the engine. You should see a steady stream of water coming out of the holes on the top of the engine. However, some brands do pump out a stream, but it might not look steady.

Pull the hose that feeds water to the engine. If water is flowing there the fresh water pump is working. If it isn’t you either have a clogged intake or a bad pump.

The Alpha Gen II upper and lower housings are fastened together with two through bolts on either side of the drive along with the front and rear bolts, while the Gen 1 drives use one stud visible on either side. Alpha Ones have two studs under the ventilation plate just above the prop.

Water should come out prop hub and relief ports at bottom of gimbal ring.

The average cost for a Water Pump Replacement is between $306 and $455 but can vary from car to car.

The Alpha One and “R” pumps have a plastic upper housing and the Gen 2 drives have a Stainless housing. Remove the housing nuts and/or screws and lift the housing off the shaft. Remove the impeller, the key and the wear plate. The Alpha One and the “R” drives have plastic water pump bases.

The Alpha One has two nuts underneath the ventilation plate. The Gen 2 drive is held together with through-bolts on the sides. The two side nuts of the Alpha One are the last to be removed and

The Gen II does not have a water pump base. It does, however, have a Seal Carrier under the water pump. The Seal Carrier has two oil seals in it which wear out with use. We suggest replacing the Gen II Seal Carrier so the seals stay fresh.