GreenDieselEngineering wrote:
The arm with the crack supports the viscous heater and should not be used in this condition. You could get a shop to TIG weld it to strengthen the arm back up. With that damage, I would be leary of the pump assembly itself. Does the water pump impeller look good and bearings seem tight? If so, a weld job would suffice.
Tig welding may fix the crack, but the case might distort and then the alignment might be off and cause timing belt tracking problems, there is no way to know. Also the mechanical seal may be damaged and leak or the grease in the bearings cooked out. If this was an antique car, you could press out the bearing cartridge with a driver that goes through the impeller, carefully remove the seal, weld it up. Build a jig to hold the housing with the bore as reference, reface the mounting surface, reassemble, cross your fingers and hope the seal does not leak, and use a thicker gasket. Since the CRD is not an antique car, this would be an exercise in futility.
I would get a refund and not pay the freight back, the item is defective and should be shoved where the sun don't shine.