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trash pump impeller removal ??

Problem Description

The user is trying to remove the impeller from a trash pump to rebuild it, but it is stuck on the engine crankshaft. A screw with an o-ring in the center was removed, but the impeller remains stuck. The user is unsure if the shaft is threaded or has a keyway and is seeking advice on how to remove it.

Possible Solutions and Suggestions

Some suggest that the impeller might be screwed on, possibly reverse-threaded. Others suggest it could be a slip fit and recommend gentle prying on opposite sides, potentially using thin screwdrivers or flat bars. Heating the impeller or using a forked wedge tool are also mentioned. Tapping the outside of the center hub for a pipe coupling or flange fitting to pull on is another idea. Smacking the bolt head with a hammer or using a brass punch on the end of the shaft while prying is also suggested. Some recommend checking for a small allen bolt or a groove cut in the shaft.

Experiences and Observations

One person had a similar issue and couldn't remove the impeller without risking damage. Another person believes the impeller is a slip fit and suggests gentle prying. Someone else mentioned that they heated the impeller to remove it, but it potentially damaged it. One person suggests that if there is an o-ring on the cap screw, then it must be slipped on.