lower timing belt question!!

Ok dudes, havent posted here in a while. I
changed my timing belt a while back and forgot to put back the little rubber piece (gasket?) that goes between the lower timing belt cover and the engine wich is now where my car has an oil leak. My question is am i going to have to pull off my crankbolt to take the lower timing belt cover off. its been a while since i did this. thanks!