Marking of the seal between the cylinder head and the engine crankcase
1 – part number; 2 – code; 3 – the number of holes indicates the permissible excess of the piston over the block surface
The arrangement is similar to that of the 1.6-55 kW engine.
The connecting rods are made of steel forgings. The upper eye is equipped with a bronze bushing. The lower eye is separate and inserts made of three layers of metal are inserted into it. The correct relative position of the connecting rod and its lower part of the eye is indicated by punching on the sides (see designation B in Fig. Mounting reamer of connecting rod and piston), the belonging of the connecting rod assembly to the cylinder is indicated by the number of punch marks on the surface of the connecting rod and the lower eye (A). The connecting rods are divided into groups by weight of 75 g and are checked for parallelism of both eyes.
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The pistons are made from light alloy castings (Al, Si, Cu, Ni, Mg). In three grooves on each piston there are two sealing rings and one oil scraper ring. All rings are assembled with the inscription TOP upwards. The assembly position and belonging to the cylinder is indicated on the inner side of the piston.
Pistons are divided into groups by weight and diameter tolerance. Just as cylinders can be reground up to 2 times, pistons can be ground up to 2 times.
Piston pins are steel, hollow, with an outer diameter of 17 mm and a relief hole of 10 mm. The pins move freely in the eyes of the connecting rods and pistons. They are prevented from falling out by elastic rings snapped into grooves in the pistons. When assembling pistons and connecting rods, it is necessary to control the position of the pistons at the top dead center. Depending on the excess of the piston over the upper edge of the cylinder, the thickness of the seal for the cylinder head is selected. The seal between the cylinder head and the crankcase is metal, shaped, covered with a thin layer of plastic on both sides. It is available in three thicknesses and is designated by a hole or a notch along the edge.