Qusetion: The maximum gas pressure in an 8-in diameter diesel-engine cylinder is 750 psi. There are six r-9 UNC cap screws fastening the cylinder head to the engine block. In order to provide a gas-tight joint, the cap screws have been tightened so that each screw has an initial tensile load of 14 000 lb. Find the maximum average tensile stress in the cap screws when the engine is operating. Ignore the effect of the gasket.