| 1. Remove piston rings with a tool for installation of piston rings, be careful not to scratch the piston. |
| 2. Use a wire brush or fine sandpaper, clean the piston head of the deposits. |
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| 3. Clean piston ring grooves using a special tool or a piece of a broken piston ring. |
| 4. After removing all sediment clean pistons and rods solvent and dry them. |
| 5. If the pistons and cylinder wall is not much worn, and the cylinders were chiseled new pistons is required. |
| 6. Carefully inspect all pistons for cracks on the skirt of the piston and connecting rod on the surface around the finger. |
| 7. Inspect the pistons for scratches, scoring, scorched areas or corrosion. |
| 8. If the piston skirt badly scratched, the reason is overheating or abnormal combustion of the fuel mixture. In this case it is necessary to carefully check the lubrication and cooling of the engine. The presence of a hole in the piston crown points to an abnormal combustion of the fuel mixture (takes her premature ignition). The reasons may be leaking from the intake manifold, poor fuel mixture, incorrect ignition timing, a fault in the exhaust system. |
| 9. Corrosion spots on the piston, the cooling fluid flows into the combustion chamber. |
 | 10. Measure the side clearance of piston rings. If the gap exceeds the admissible limits, the piston must be replaced. |
 | 11. Measure the clearance between the piston and the cylinder to measure the diameter of the piston perpendicular to the piston pin and measure the diameter of the cylinder. Subtract the piston diameter from the cylinder diameter. If the clearance exceeds the allowable limits, it is necessary to bore the cylinder and install a new piston and new piston rings. |
| 12. Check the clearance between the piston and connecting rod. |
| 13. Inspect the connecting rods for cracks and other damage. For a more detailed verification of pistons and rods address to experts. |
| 14. Measure the length of the connecting rod bolt threads. In four-cylinder engines, bolt must be no longer than 45 mm, and a six-cylinder engine is not longer than 48 mm, otherwise the screws must be replaced. |
