In the car engine, there are two ways to connect the small end of the connecting rod of the Carrier 06E piston kit to the piston pin, namely the full floating type and the semi-floating type. When the fully floating piston pin is working, it rotates in the small end hole of the connecting rod and the piston pin hole, which can ensure that the piston pin wears evenly along the circumference. In order to prevent both ends of the piston pin from scratching the cylinder wall, a piston pin retaining ring is installed outside the piston pin hole. The semi-floating piston pin uses bolts to clamp the piston pin in the small head hole of the connecting rod. At this time, the piston pin only rotates in the piston pin hole and does not rotate in the small head hole. The small head hole is not equipped with a bushing, and the piston pin retaining ring is not installed in the pin hole.

The joint surface perpendicular to the axis of the Carrier 06E piston kit is a flat notch connecting rod, and the joint surface is at an angle of 30° to 60° to the axis of the connecting rod is an oblique notch connecting rod. The large end of the connecting rod body with flat cuts has a relatively large rigidity, so the force deformation of the big head hole is small, and the manufacturing cost of the connecting rods with flat cuts is relatively low. Gasoline engines all use flat cut connecting rods. Diesel connecting rods are available with both flat and oblique cuts. Generally, due to the large diameter of the crank pin of a diesel engine, the external dimension of the big end of the connecting rod is relatively large. If the connecting rod body can be taken out from the upper end of the cylinder during disassembly, the connecting rod with an oblique cut must be used. When the connecting rod cover is assembled on the connecting rod body, it must be strictly positioned to prevent the lateral displacement of the connecting rod cover. The flat notch connecting rod uses a precision-machined cylindrical surface and a precision-machined bolt hole on the connecting rod bolt to realize the positioning of the connecting rod cover. The connecting rod bolts of the oblique cut connecting rod are prone to fatigue failure due to the large shear force. For this purpose, a positioning method that can withstand lateral forces should be used.

The wear of the piston ring groove of the Carrier 06E piston kit is an important factor affecting the service life of the piston. In an engine with a higher degree of strengthening, the temperature of the first ring groove is higher and the wear is serious. In order to enhance the wear resistance of the ring groove, a heat-resistant retainer is usually embedded in the first ring groove or the first and second ring grooves. In the high-strength direct-injection combustion chamber diesel engine, a heat-resistant retainer is inlaid at the first ring groove and the throat of the combustion chamber to protect the throat from cracking due to overheating.

When the engine is working, the piston of the Carrier 06E piston kit undergoes mechanical deformation under the action of gas force and lateral force, and thermal deformation occurs when the piston is heated and expanded. The result of these two deformations is to increase the size of the piston skirt in the axial direction of the piston pin hole. Therefore, in order to make the skirt close to the perfect circle when the piston is working and adapt to the cylinder, the cross section of the piston skirt should be processed into an ellipse during manufacture, and its long axis should be perpendicular to the axis of the piston pin hole. The pistons of modern automobile engines are all oval skirts. In addition, the temperature of the piston along the axis of the piston is higher at the top and lower at the bottom, so the thermal expansion of the piston is naturally larger at the top and smaller at the bottom. Therefore, in order to make the skirt close to the cylindrical shape when the piston works, the piston must be made into a conical or barrel shape with a small top and a large bottom.