Fig. 3.37. Measurement of diameter of the cylinder nutromer

Fig. 3.38. Scheme of measurements of diameter of the cylinder: And, In – the directions of measurements; 1, 2, 3 – belts of measurements

Measure diameters of cylinders nutromery (fig. 3.37) . The scheme of measurement is shown in fig. 3.38 . If wear of walls of cylinders exceeds 0,08 mm, then it is necessary to chisel them to the following repair size and to install the corresponding repair pistons. Even if only one cylinder is worn-out, on the repair size all cylinders are processed. Rods replace in a set.

Carefully clear a bent shaft. Examine radical and conrod necks of a bent shaft. Measure by a micrometer diameters of necks and define deviations from roundness of each neck. Values of the repair sizes, admissible wear and the admission of roundness of necks are given in subsection 3.1.1. At wear of necks, existence on them рисок or scratches, deviations from roundness all necks of a bent shaft process on the following repair size in repair shop.

Before repeated installation the bent shaft needs to be cleared carefully, oil channels — to clean and blow compressed air. Be convinced of lack of traffic jams in them. For this purpose by means of a butterdish fill in oil in an opening of the oil channel — it has to leave other opening on the next neck. Any blockage of the oil channel should be eliminated before installation of a bent shaft.

Check a condition of inserts of conrod bearings. A sign of damage of conrod bearings is the regular rhythmical loud knock from a bent shaft. Its frequency depends on the frequency of rotation of a bent shaft. This knock is especially well listened during the operation of the engine with loading. It can be followed by oil pressure drop.