my wiper motor gets hot ?

It could be mechanical resistance (bearings, gears, grease) or electrical ( brushes or somehting deeper).
First identify which wiper motor.
As best we've put together so far, there were two, two speed wiper arrangements in 1967.
The motor of one has a white plastic plate over the gears.
2822 963
The other is a variable speed motor with a two speed switch.
2822 962

Photos and discussion here
Wiper Motor Wires