I am new to forum,thanks for any help, please forgive me for not knowing, I have a Spectrum GE Dash 8-40C Diesel CSX #7563,I ran it as per breakin for 10 days and the motor started to vibrate. Found flywheel shaft had melted plastic motor opening. looking for replacement motor. how do you get the driveshaft coupler off the flywheel, new motors don't seem to come with them.