In case of complete disassembly of the engine, wash the cylinder block well, clean the oil channels and channels for supplying coolant. At the same time, it is necessary to pay attention to the fact that after washing the detergents are completely removed. If possible, it is best to use compressed air.
To determine the gap between the piston and the cylinder, it is necessary to measure its diameter (see fig. 72) and record the measurement results.
Then measure the diameter of the cylinder (see above).
If, on the basis of these figures, to build a scan of the mirror of the cylinder (pic. 80), you can easily assess the degree of its wear. The difference between the results of measurements in the upper lower sections of the cylinder makes it possible to estimate the taper of the cylinder, and the difference between the measurements in the longitudinal and transverse planes - ovality. Deviations of the cylinder diameter from the nominal value should not exceed 0.04. There are three repair piston sizes. This allows the cylinder to be bored to fit the new piston. Check the warping of the mating plane of the cylinder block in the same way as described when examining the cylinder head.
Measurements are made in the longitudinal, transverse and diagonal directions. The deviation from flatness should not exceed 0.10 mm.
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