Hey LA POTTER,
It is unlikely that replacing the belt caused an oil leak.
I have attached a picture of the procedure, you do not have to remove anything that could then leak oil.
I would advise potentially either that the leak was cleaned off before you bought the vehicle or it is an unrelated fault.
Have you discovered the source of the leak?
Inspect and send us some pictures if you would like anything explained.
Hope that helps, any further questions please don't hesitate to ask.
Saturday, March 23rd, 2019 AT 1:40 PM