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Compass Marine How To | all galleries >> Welcome To >> Changing A Raw Water Pump Impeller > Remove The Impeller
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Remove The Impeller

Remove The Impeller

While the concept of water pumps is the same across brands the method of how the impeller sits on, or is attached to the shaft may be different. This pump has a slotted shaft and the impeller has a screw that sits in the slot. To remove it I simply use my needle nose Vise Grip pliers. It just pops right out and could not be any simpler.

Some pumps use set screws or c-clips. Impellers with c-clip retaining rings will require a set of c-clip pliers. It's always good to know what your pump looks like before taking it apart so you can have the right tools on hand. Most engine manufacturers and pump makers have on-line parts manuals that will show an exploded view and will allow a sneak peek into the inside of your pump before you open it up..

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Harvey Rosenberg 22-Mar-2010 13:42
Just a note on some Universal engines. The impeller shaft is a split shaft, with forward and aft keyed pieces. If the shaft is moved out by pulling on the impeller you be required to be aligned it with the split portion-see engine manual. Furthermore, moving the shaft does something to the seals, which will make them leak and they would need to be replaced. There is a special tool from auto stores to remove the c-clip. When removing the impleller hold a screwdriver firmly against the shaft to prevent it from moving forward. When you put the impeller back on the shaft, the c-clip groove may not be fully accceessible,as the shaft may go to far in. Use a strong thread arount the groove, put the thread thru the impeller and then put the impeller on. Then,holding the impeller, pull the thread and the shaft ever so slightly out so that groove is visible. Then the c-clip can be placed back on. the shaft. This procedure may only be necessary on Sherwood pumps, but check it out. If using a mechanic be sure he understands this, as I have a mechanic pull the impeller out with the shaft.
Morley 12-Oct-2009 17:45
Excellent piece - clear and informative