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A common dryer motor problem has been intermittent running ( sometimes runs, sometimes won't run ) makes a strange noise and stops running. Check the motor end bells. If your motor end bell looks like the one in the picture...it is an indication of a faulty bad ( or going soon ) motor.
Take notice to the motor end, the end bell has worn to one side....this is a bad motor! One side is wider than the other side....see those red lines indicating the end of the motor has worn over to one side. Note: your motor will NOT have those red lines on it, they are an illustration on the picture only.
Oil leaking out of the motor end bell or cracks in the rubber on the motor end bell are other possible indicators of a motor going sour.