Are you replacing your failed motor with the best motor for your application and environment? The easy part of replacing your motor is matching the frame size, horsepower, RPM, and voltage, but it may not always be wise to just replace the motor with a motor matching the same enclosure that you have always had.
It is important to consider what enclosure is best for the environment that the motor is going to be installed in. You certainly wouldn’t want to continue on with a mistake that was made when the original motor was selected. Often times equipment OEM’s select a motor based on cost and not what's in the best interest of the longevity of service.