Crack in Hayward Super pump housing wth pics

[bobjersey]

Hayward EC-75 and Super Pump of unknown HP. The filter is brand new but the pump is 10-15 years old.

My pump has been having some performance issues. Seems like an air leak in the
system somewhere, could this be the cause? Also the concrete around the pump base is always wet (but not soaked). The crack is inside the pump housing
in the wall that separates the basket from the pump motor. Do I need to replace
the pump housing, or can I fix it with putty or epoxy?

I am currently replacing the diffuser gasket and housing gasket, but I can't get to the seal because the screws have rusted over and I can't get the rear cover off the pump motor.

Pump housing from above:



A closer shot of the crack:



And a shot from the motor side of the pump housing: