2. Measure the piston diameter at a distance of 10 mm from the bottom edge of the skirt, and at an angle of 90°to the axis of the piston pin. Compare the resulting value with the information in the Specifications (photo). Permissible maximum wear - 0.04 mm.
3. Insert the piston ring into the bore of the cylinder and use the piston to push it down the bore until it is approximately 15 mm from the base of the cylinder. Measure the ring gap with a feeler gauge (photo). If the clearance is greater than the specified limit, look for visible signs of cylinder bore wear, or if a new piston ring is present, measure the clearance of the new ring in the cylinder bore.
4. To measure the cylinder bore diameter directly, a bore gauge is required. If the specified tool is available, measure the diameter of each cylinder bore at six points and compare with the specified wear limit. The bore diameter of the cylinder should be measured 10 mm from the top, 10 mm from the bottom, and in the middle. E1A at each of the three distances indicated, measure the diameter parallel and perpendicular to the axis of the crankshaft. If the wear of the cylinder channels is outside the specified limit, the cylinders must be bored and new pistons installed.
5. If one hole needs to be bored, all four cylinders must be bored and a new set of pistons used, otherwise the engine will not be balanced. The connecting rods must be installed as complete sets.
6. Measure the clearance between each piston ring and groove side as shown in the photo. If there is excessive clearance, the groove is probably worn, not the ring, so a new piston will be required. If new piston rings are being installed, the wear ridge at the top of the cylinder bore must be removed, or the top ring stepped on.
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