2. Slide the piston rings into the grooves (see illustration). Using a feeler gauge, determine the gap between the ring surface and the piston groove surface. If the gap is more than 0.15 mm, the ring or piston is worn out.
12.2 Measuring the gap size of piston rings in piston grooves
3. Next, insert all the piston rings in order, starting from the top of the liner. To measure the piston ring gap, insert a feeler gauge into the gap between both ends of the ring. Piston rings with too large a ring gap cannot be reinstalled.
4. To determine the clearance of the working surface of the cylinder, measure the diameter of the hole. The hole must be measured in the longitudinal and transverse directions and at three depths of the liner. This is how the largest and smallest diameters are found. Write down the values. Now subtract the piston diameter from the diameter of the hole. The measurement is made in the right corner in relation to the piston pin hole. The difference is the cylinder clearance, which should be within 0.023 - 0.047 mm. If the cylinder clearance is larger, install a new liner.
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5. Check the piston pins and bores for wear or damage.
6. Using a special device, check the connecting rods for deformation, since bent or twisted connecting rods do not contribute to the smooth operation of the engine.