da, hntnfsh is right, get a new sleeve if thats it or impellar if thats it, check the impeller for burn marks on the cutting edge? it will look pitted, if its bad on all three blades replace it and buy a new one and keep the old one for a spare. never sharpen the cutting edge of an impellar, that will change the angle of bite and speed up the pitting on the blades, which will lead to the impellar blowing up. stay away from the stainless impellar, those where developed by woolridge boats for alaskan waters, heavy glacier silt, which chews up aluminum impellars pretty quick. also if you where to jam up the pump(rock or stick)the aluminum impellar would give, the stainless does not, resulting in broken crank or something else? shimming the impellar out is really important for peak performance, i check mine all the time, if you got the impellar off check the bolts holding the whole pump assembly on, these i would lock tight , they will come loose and fall out, i got lucky and caught mine before they came all the way out. nice sharp grates help to but if you are in the rocks like i am its a waste of time.. good luck