To measure cylinders, you need to use a special dial gauge, with which you can measure the top, middle and bottom of the cylinder. If the dial gauge is not available, this operation cannot be performed.
1. The cylinder should be measured in directions A and B. In addition, measurements should be taken at a distance of 10 mm from the top edge, 10 mm from the bottom edge and in the middle part, i.e. at levels 1, 2 and 3. A total of six measurements should be made on each cylinder. All measured values must be recorded and compared with those given in the Specifications.
2. It should be borne in mind that you will have to bore all the cylinders, even if the dimensions of one of the cylinders are not normal. A deviation of 0.8 mm from the nominal value is permissible. The repair dimensions of the pistons are indicated in the Specifications.
3. The final cylinder size is determined by measuring the piston diameter, which is taken 10 mm from the bottom edge of the piston skirt and in the right corner of the piston pin hole.
4. After that, the value of the piston clearance of 0.03 mm should be added to this dimension. In addition, 0.02 mm should be added to the honing of the cylinder.
5. To check the piston clearance in the cylinder, measure the piston and cylinder as described above, and calculate the difference between these values. If the result exceeds 0.08 mm, the cylinders must be rebored because the gap has reached the wear limit.
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