it will not cause a problem, but you do have to have those lines connected, but there is another way around it, the reason i just said to just plug that one line off and i did not say about the other 2 lines, what you can do is get you 2 lines and have one connected to the engine at the rotary valvle and then the other comes out the other side of the engine and just connect the 2 lines and make sure they are filled with oil, that away it will just circulate the oil.