If you paid via paypal you can still claim up to 90days though for a none delivery or receiving items not as described i get bum steered once a month but get all my dooh back and in the eyes of the law you owen the engine when it was outside so was up to you to protect it but you did not take delivery of it so was in care off seller this could become difficult if you had to take civil action against him.
Best advice is to contact Paypal customer services dept
Best advice is to contact Paypal customer services dept