1. Previously shatunno-piston assemblies have to be carefully cleared. Rings need to be removed from pistons.
2. By means of the special adaptation remove rings from pistons – try not to damage walls of the last incidentally.
5. Having removed the main deposits, wash out shatunny assemblies by solvent and carefully dry them, whenever possible with use of compressed air. Check passability of maslovozvratny openings in back walls of flutes under installation of piston rings, and also oil openings in the lower heads of rods.
8. Check persistent surfaces of a skirt of the piston for existence of scratches, the bottom – on existence of through openings and progar on edge. Existence of scratches on a skirt can be regarded as a sign of long overheats of the engine, or too early ignition of air and fuel mix – check serviceability of functioning of the cooling system. Progara at the edges of the bottom are the certificate of a detonation. Anyway, the reason of the revealed violation has to be eliminated in order to avoid recurrence. Also leak of the soaked-up air, the wrong configuration of air and fuel mix, violation of installation of a corner of an advancing of ignition, the wrong functioning of systems of ignition and EGR can act as the possible reasons of formation of the listed defects.
9. Dot corrosion of pistons in the form of cavities speaks about hit in combustion chambers and/or a case of the engine of cooling liquid. Besides, take care that the reason of internal leaks was eliminated.
10. Estimate the size of a lateral gap of landing of piston rings in the flutes for what enclose a new ring outside in the flute on the piston and measure by the probe of lezviyny type the remaining gap (see an accompanying illustration). Repeat measurement in two-three points on flute perimeter. Watch to pereputspetsifikatsat compression rings (the top differs from the second). If the size of a gap exceeds admissible value (see Specifications), pistons are subject to replacement.
13. Estimate correctness of landing of pistons on rods, having tried to rotate components in opposite directions. Existence of any noticeable side play speaks about excessive wear of a joint. For correction of a situation it is necessary to deliver shatunno-piston assemblies in a workshop of car service where necessary recovery repair and replacement of fingers will be made.
14. Performance of procedure of removal of pistons from rods (in case of such need) has also to be entrusted to specialists of car service. In parallel rods can be checked for existence of signs of a bend, twisting and other deformations with use of the special diagnostic equipment.