Home › Forum › Ask A Member › 56 scott 7.5 ???? › Re: 56 scott 7.5 ????
I have the complete Service Manuals for all these years of engines, and own the 55/5hp, and the 56/10hp. It’s my understanding (memory without checking) that the 5, 7.5 and 10 hp all take the same impellers for those 2 years. Also, there are 2 styles for these impellers. The older one has no relief dimple on the bottom of the impeller to reduce drag when the blades are flexed. The newer impellers are also marked "top" on them for this purpose during installation. Take note: When installing a new impeller, make sure that it does not bind over the pump pin on the driveshaft. If the impeller binds, the edges of the pump pin should be filed slightly to allow the pump to float on the shaft. This is very important.