According to the parts book the wiper motor is a later Lucas 75425A but the important first stage and shown in the link David has posted is that if you remove the cover plate you can separate the motor from the drive cable.
This should allow you to check if the cable and the wheel boxes are operating freely. The parts book lists the wheel box as a Lucas 72729A if you use a later but interchangeable motor you need to retain the drive wheel and link bar from the original as this regulates the degree of sweep of the blades.
Geoff.
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