So I was replacing my head gaskets and I was putting everything back together. Well I forgot to make some timing marks and now my 2002 xterra 3.3 v6 non supercharged won't start. At first I didn't put the pulley on the timing marks so my question is how do I know when I'm top dead center and do I take the distributer cap off and make sure its pointing at cylinder 1? And which mark do I line it up with? And I don't have a timing light. Is there a way to manually time it?