Connecting rods with pistons in assembly — general information (Skoda Octavia 1U)

The connecting rods are made of steel forgings. The upper eye is equipped with a bronze bushing. The lower one is disassemblable and has a three-layer metal insert inserted into it. The correct relative position of the connecting rod and the lower part of the hole is indicated by punching on the sides (see designation B in Fig. Mounting reamer of connecting rod and piston), the alignment of the connecting rod assembly and the cylinder is ensured by the number of punch marks on the surface of the connecting rod and the lower eye. The connecting rods are divided into groups by weight of 75 g and checked for parallelism of both eyes.

The pistons are machined light alloy castings (Al, Si, Cu, Ni, Mg), the friction surface of which is graphitized to reduce the gap. This has a positive effect when starting a cold engine, and also leads to a calm and quieter engine operation. In three grooves on each piston there are two sealing and one wiping ring. On all rings the top is marked "TOP". The arrow on the bottom of the piston should always point to the belt drive during assembly.

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