Volvo: Volvo marine engine AQ131A, left hand thread, center bolt

Question
Am trying to remove cranksgaft pulley and sprocket, but can not budge the center bolt that holds them on. This wouldn't be a left hand thread, would it?

Answer
I don't have a lot of experience with the marine engine, but assuming it is similar to the 4 cylinder gas B21F engines, I'm pretty sure it isn't a left hand thread.  Whats more likely is that the bolt developed some rust within the threads themselves.  Some liquid wrench and a good bit of torque with an extended handle would be my next course of action.