Auburntsts
Well Known Member
I need to mount my starter ring gear (and its support assembly) to my IO-540 but I’m not sure of how to get it properly aligned. I was told that there would be an “O” stamped/engraved on both the gear support assembly (near one of the bushing holes) and a corresponding “O” on the prop flange and that all I needed to was align the “O’s” together. Problem is neither the gear support assembly nor the prop flange on the engine have any “O’s” stamped anywhere that I can find. So I then figured I could then just use the #1 cyl TDC mark, put the #1 Cylinder to TDC and align the TDC mark to the engine case vertical split line. Problem #2 is there are timing marks (#1 TDC, 20 deg and 25 deg) on both sides of the gear support assembly and they aren’t located at the same point on the gear’s perimeter. So if I go this route, should I use the timing marks on the forward side or the aft side? Am I making this too difficult?