2. Using a broken piston ring or a suitable tool, clean the piston grooves.
3. Using a soft brush and solvent, thoroughly clean the pistons.
4. Measure the outer diameter of the piston at a distance of 39.15-39.87 mm from the piston crown. Rated value: 76.47-76.50mm (1.6 l); 75.47-75.50mm (1.4 l).
5. Calculate the clearance between piston and cylinder. Compare the result with the nominal value. Nominal value: 0.02-0.04 mm.
6. Using a set of feeler gauges, check the clearance between the new piston ring and the piston groove. Rated value: 0.04-0.085mm (compression ring); 0.08-0.175mm (oil scraper ring). If the clearance is greater than 1.0 mm, replace the piston.
7. Install the piston ring into the cylinder at right angles to the stacks, carefully pressing it in with the piston. Using a set of feeler gauges, measure the piston ring gap. If the gap in the lock is more than the maximum allowable, replace the ring. If the clearance is much larger than the allowable value, check the inner diameter of the cylinder.