Fig. 447. Measuring the diameter of the cylinder bore. Insert the bore gauge vertically into the cylinder bore and gradually lower it along the cylinder bore in a perpendicular position relative to the walls
To measure cylinder bores, you need a bore gauge (Fig. 447). We would like to warn you that it is not easy to use such a device, since when you tilt the measuring tips, you will get incorrect measurement results. If you do not have a bore gauge or do not know how to use it, you will not be able to carry out the following work. In this case, it is better to contact a service station.
The cylinder bore measurements should be taken in the longitudinal and transverse directions. Using a bore gauge, measure the cylinder diameter at a distance of 10 mm from the upper edge of the cylinder bore, and then at a distance of 10 mm from the lower edge of the cylinder bore. Take another measurement in the center of the cylinder bore. You will have a total of six measurement results. Record all the values obtained and compare them with the data given in the adjustment and control table. Remember that the bore gauge in the cylinder bore must be positioned at the correct angle, because even the slightest tilt leads to incorrect measurement results. If the bore gauge is inserted as shown in Fig. 447, it may tilt to the right or left during the measurement. The pointer of the device will constantly return to the average value, which is what is meant when measuring the cylinder bore diameter.
Fig. 448. Diagram of measuring cylinder bores. Take measurements in each cylinder bore in directions A (transverse direction of measurement) and B (longitudinal direction of measurement). Measurements should be taken in three places, namely at depths 1, 2 and 3
Record all 6 results for each cylinder. If you draw a diagram similar to Fig. 448, then it is better to record the measurement results in it for greater clarity. The cylinder diameter should not differ anywhere more than 0.08 mm from the nominal size.
Fig. 449. Measuring the piston diameter
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To measure the piston clearance, measure the piston diameter (Fig. 449) and record the obtained values of all piston diameters. To determine the clearance, calculate the difference between the cylinder bore diameter and the piston diameter.
The engine can be equipped with pistons of two larger (repair) sizes, which requires boring the cylinder block.
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