I've got the same question. Trying to remove mine right now. It's not budging either way so far.
ok, i found it in manual...
19, Impeller
Insert impeller shaft holder (P / N 295 000 082) on
impeller shaft flat end.
Using 2 screws previously removed from venturi, secure shaft holder to housing. To ease removal
heat impeller center with a propane torch to approximately 150° C (300° F) to break the Loctite
bond.
Impeller is loosen using impeller remover tool (P /
N 295 000 001).
Install shaft holder in a vice.
Insert special tool in impeller splines.
Rotate impeller remover tool counterclockwise
and unscrew completely impeller