Car cylinder head bolts require different tightening torques depending on the size of the bearing cap. Large bearing caps require 8 torque, while small bearing caps require 6 torque. The method for tightening car cylinder head bolts is to start from the middle and work outward to both sides. First, tighten to 50% of the final torque, then loosen all bolts completely. Next, tighten again from the middle outward to 50% of the final torque. Finally, tighten the cylinder head bolts completely, following the sequence of middle first and then both sides. Below is a classification of cylinder types: Single-acting cylinder: Only one end has a piston rod. Compressed air is supplied to one side of the piston to generate pressure, which pushes the piston to extend and produce thrust. It returns via a spring or its own weight. Double-acting cylinder: Compressed air is alternately supplied to both sides of the piston, generating force in one or two directions. Diaphragm cylinder: Uses a diaphragm instead of a piston, generating force in only one direction and resetting via a spring. It has good sealing performance but a short stroke. Impact cylinder: This is a new type of component that converts the pressure energy of compressed gas into the kinetic energy of the piston's high-speed movement (10 to 20 meters per second) to perform work. The impact cylinder features a middle cover with a nozzle and a drain port.
