I just bought an 05 Cobalt SS from a friend. He says the timing chain fell off when trying to start it. I can only assume that the tensioner malfunctioned or wasn't torqued right. He said there was also coolant in the oil so the head is coming off anyways (as i can look for damage also if the chain did actually break). What is the best/easiest method for setting the engine to TDC if the timing chain is not on it?