How to Change the Water Pump on an Evinrude 150 Outboard
The water pump on an outboard motor is designed to pump water from the river, lake or other water body in which the motor is operating, through the motor to keep it cool. This "coolant" is then ejected back into the water from where it came. Because this water is from a natural source, it is common for sand and other debris to collect in the water pump which will wear down the pump's impellers, eventually causing the pump to fail. The manufacturer suggests replacing the water pump on an Evinrude 150 annually, as part of the motor's regular maintenance schedule.
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Instructions
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Disassemble the lower section. The pump on the Evinrude is located between the motor and propeller, and the lower section must be disassembled in order to access it. This can be done while the engine is attached to the boat's engine mount; remove the bolts found halfway between the engine and propeller, then the anti-cavitation tab -- the fin where the sections are joined.
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Move the section to a workplace. Once the lower section is disassembled, it can be easily be moved to a different location, such as a workbench, to continue work. Place the lower section partly on a piece of lumber or other material to avoid having it rest on the fins or propeller.
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Locate and remove the old pump. The pump is a plastic component with two hoses attached. Using a screwdriver, remove the hose clamps and pull away the hoses, noting where each hose was attached. Remove the screws that fasten the water pump to the unit, then lift out the pump.
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Install the new pump by reversing the process. Place the new pump the same way the old one was, and replace the screws. Refasten the hoses with the hose clamps to the same ports from which they were disconnected.
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Return the lower section to the motor once the new pump is secure. Return the anti-cavitation tab, then refasten the bolts that kept the unit in place.
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Tips & Warnings
It is best to replace the pump with an identical one. Take out the old pump before buying a new one to ensure you get an identical replacement.
Make sure that each piece is fastened securely back in its original place, otherwise the motor could get damaged. For example, loose hoses or reversing their attachments can lead to excess water reaching the engine or no water going through to keep it cool.
