Seal marking between cylinder head and crankcase
1 - part number; 2 - code; 3 - the number of holes indicates the permissible excess of the piston above the surface of the block
The arrangement is similar to that of the 1.6–55 kW engine.
The connecting rods are made from steel forgings. The top lug is equipped with a bronze bushing. The lower lug is separate and inserts from three layers of metals 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), belonging of the connecting rod assembly to the cylinder is indicated by the number of punches on the surface of the connecting rod and the lower lug (A). The connecting rods are divided into groups by weight of 75 g and are controlled for parallelism of both lugs.
Pistons are made from light alloy castings (Al, Si, Cu, Ni, Mg). Three grooves on each piston have two O-rings and one oil scraper ring. All rings are assembled with the inscription TOP up. Assembly position and cylinder affiliation are indicated on the inside of the piston.
Pistons are divided into groups according to mass and diameter tolerance. Just as cylinders can be reground up to 2 times, pistons can be reground up to 2 times.
Piston pins steel, hollow, outer diameter 17 mm, facilitating hole - 10 mm. The fingers move freely in the lugs of the connecting rods and pistons. They are protected 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 top dead center. Depending on the excess of the piston of the upper edge of the cylinder, the thickness of the seal is selected under the cylinder head. The seal between the cylinder head and the crankcase is metal, figured, covered on both sides with a thin layer of plastic. It is produced in three thicknesses and is indicated by a hole or a notch along the edge.