I have a 2004 Volvo Penta 4.3GXi- I have changed the impeller, O-ring, and sealing ring, Since then upon trying it out- water has been coming from a 3inch round by 2 inch deep wheel that sits in front of the pulley. Not sure if it is connected to the pulley or not. There is a 3/4" by 1/4" slot...
