Response to Hello.  The Magnetek Century 1.5HP Square Flange 56Y Up Rate Motor model B2854 is the compatible replacement motor for your Century Centurion motor model 193986.  It is recommended that the motor shaft seal, seal plate gasket, and diffuser O-ring be replaced at the same time.  These items are specific to the manufacturer/model of the pump, and not the motor.  Please provide Pool Pump manufacturer/model information and a recommendation can be made. 

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