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My biggest complaint with the Sierra impellers I have had is their propensity to take a set. The last one I had trouble with was in a OMC 5.5hp. I bought a ’62 Johnson 5.5 at an auction for $20. It was really rough but complete so I decided to go ahead and get it going. I replaced the impeller with a new Sierra part as part of a tune up service. I replaced the gearcase oil but did not reseal. The motor turned out to be a good runner, although a but tired from many hours of use. The gearcase ended up leaking so when I pulled it again to reseal I naturally checked the water pump. The impeller had taken enough set in one season to hardly put any pressure on the circumference of the pump housing at it’s farthest point from the drive shaft.
Soon after that I had one in my 4hp twin cylinder mercury stop pumping altogether because of excessive set. This one also after only one season. Now I try to stay away from Sierra impellers and typically use OEM.
-Ben
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