Hi I am trying to understand. I do not have a degree wheel or dial indicator so I am going by sight which is pretty good. However, you seems to be saying that the alignment marks on the gear and the cam may not necessarily be touching each other. From what I have been told, I always assumed that, the alignment marks simply needed to be adjacent to each other so that they came as close as possible to touching each other. If so, it would be properly aligned. But it seems that you are saying that if a valve is still open when the piston is TDC and the marks are adjacent to each other, there is still a problem and then the cam needs to be rotated 180. That would mean that the mark on the cam would be as far away from the mark on the gear as possible? Am I understanding correctly? This is a revalation to me as I have been toying at this for 6 months and from what I was told, the marks must be adjacent to each other for alignment to occur? I am stumped and perplexed. Please help if you can. I am still at the 3rd grade level here.
Does anyone know where the aliignment marks can or should be to be properly aligned. This is a Briggs 28N707 15 HP OHV