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4-8-3-1-1-podgotovka-bloka-cilindrov-k-remontu-i-ocenka-ego-tekhnicheskogo-sostoyaniya.html
4.8.3.1.1. Preparation of the block of cylinders for repair and assessment of its technical conditionMeasurement of cylinders of the engine of fashion. 2106 nutromer
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1 – nutromer;
2 – installation of a nutromer on zero on caliber |
Scheme of measurement of cylinders
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And yes In – the directions of measurement;
1, 2, 3, 4 – numbers of belts
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To make the general cleaning and survey of the block of cylinders. To wash up the block of cylinders, having shipped it in a bathtub with the washing solution. Then to wash out it a stream of the same solution under pressure to clear oil channels. To carefully blow and dry compressed air all block of cylinders, especially system of oil channels.
To examine the block of cylinders. If in support or other places of the block of cylinders there are cracks, then the block of cylinders should be replaced.
If there is a suspicion on hit of cooling liquid in an engine case, then it is necessary to check tightness of the block of cylinders at the special stand. For this purpose it is necessary to muffle all openings of the cooling shirt of the block of cylinders and to force in it water of room temperature under pressure of 3 kgs.sm2, at the same time within two minutes leak of water from the block of cylinders should not be observed. At leakage detection the block of cylinders should be replaced.
To check whether exceeds a gap between the cylinder and the piston (0,06 – 0,08 mm for for the new engine and no more than 0,15 mm for working). The gap is defined by a measurement of cylinders and pistons. Diameter of the cylinder is measured by a nutromer 1 (fig. Measurement of cylinders of the engine of fashion. 2106 nutromer) in four belts both in longitudinal, and in the cross direction of the engine (fig. The scheme of measurement of cylinders) Diameter of the piston is measured in the plane, perpendicular to a piston finger, at distance of 52,4 mm from the piston bottom.
Prevention
Block cylinders on diameter are broken through 0,01 mm into five classes: And, B, C, D, E (table Dimensional classes of cylinders). The class of the cylinder is marked on the lower plane of the block (fig. Marking of dimensional group of cylinders on the block and conditional number of the block of cylinders). On the same plane, and also on covers of radical bearings conditional number of the block of cylinders which indicates belonging of covers of bearings to this block is branded.
Dimensional classes of cylinders
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Class
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Diameter of the cylinder, mm
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A
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79,00 – 79,00
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B
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79,01 – 79,02
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With
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79,02 – 79,03
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D
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79,03 – 79,05
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E
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79,04 – 79,05
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For providing an optimum gap between a mirror of the cylinder and the piston the last divide on the largest diameter of a skirt in the plane of measurement 2 (see rice. Piston of the engine of fashion. 2106) on five classes A, B, C, D, E.
Alphabetic reference of a class is applied on the piston bottom.
If the maximum size of a gap is more than 0,15 mm, it is necessary to chisel and otkhoningovat cylinders under the repair diameter of pistons (increased on 0,4; 0,7 mm) taking into account an assembly gap of 0,06-0,08 mm between the piston and the cylinder.
To check a condition of the plane of the socket of the block of cylinders with a head of cylinders regarding lack of deformation. Check is made by means of a ruler and a set of probes. The ruler is established on diagonals of the plane and in the middle in the longitudinal and cross directions. If not planeness exceeds 0,1 m, the block of cylinders should be replaced.
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