Simon.
A very good question. The green arrow point to the safetyvalve, if you see the drawing below, the startingvalve, fuelvalve and safetyvalve are placed on the centerline in the cross section drawing, which put a new question forward what`s in the place were we put the safetyvalve in the beginning? If you look at the drawing nothing protrude out of the cylinder covertop, and the object is outside the combustion space, e.g. cylinder. I`m inclined to believe this might be a cover for a castingcore opening in the cylindercover coolingspace. So I guess you can put the safetyvalve in the centerline and just indicate a cover where we erroneously placed the safetyvalve in the beginning.
Tore