How do I replace the motor in my HOTPOINT CTD80P?

Motor appears to jam/lock during cycle (approx 1min).
Has always been noisey, should that be so, or was that a warning?
Jammed and shut down recently.
Can free off by rotating or counter- rotating drum / fan. Alas does not cure, and jams again on operation.
Access to the motor appears to be limited can anyone help or advise.