You need to take gear off with the three bolts. Timing marks on the 66 series are on the flywheel under cover on right upper side of ta clutch housing. The are a couple of different ways to know if you are on number one or six and you need to know that. One is to take the side cover off of injection pump and watch for the mark on gear and when it shows up you are on number one cyl, comp stroke. The way I do it is to just turn it up to timing mark, I believe 18 degrees before tdc, take pump off and then pull throttle, turn pump and see which port ejects fuel. Had to take off a lot of pumps under warranty and could not break a seal so that method works well. Can take off valve cover also but lot more work.
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