I had my head rebuilt and am reinstalling everything. I am about to set the valve clearance on it. I have to set #1 cylinder to TDC. #1 as I understand it is the closest to the fan, correct? So I will pull the glow plugs and turn clockwise at the crank nut.... but how do I tell where I am I am very close as I had the head off and saw the piston but is there a mark somewhere or what is the procedure? I couldn't find it in the 422/M2 manual. Thanks!!!