The pistons that can be used continuously are: 1. The clearance between the piston and the cylinder, the pin hole and the piston pin, the ring groove and the piston ring does not exceed the permissible value; 2. The clearance between the piston and the cylinder has exceeded the permissible value. Values ​​(such as the 481 diesel engine does not allow repair value of 0.30 mm), but the piston itself is less wear, and the skirt wear less, ring groove and piston ring, piston pin and pin hole fit clearance are not exceeded. At this time, if a new cylinder liner is replaced, the gap between the piston and the cylinder can still meet the technical requirements, it can be used continuously; 3. The clearance gap between the piston and the cylinder can also be used for the next repair, and the piston pin and pin hole and ring groove Although the clearance gap with the piston ring has exceeded the allowable value, the piston can still continue when the diameter of the piston pin is repaired after being enlarged, or after the replacement of the new piston pin and the piston ring, if the matching relationship can meet the technical requirements. Use; 4, in the piston without cracks, ring groove collapse, serious pull marks and other mechanical damage, because the pin hole and the piston pin with the destruction of the relationship, and the new matching of the piston pin and its cooperation can not meet the technical requirements, The pin hole can be hinged and expanded, and then matched with the corresponding enlarged size of the piston pin. The reasons why the piston can't continue to be used include: 1. The piston has cracks; 2. The ring grooves wear badly (the clearance of the piston ring is generally 0.06-0.16 mm), or the places where the edges have collapsed; 3. The pin hole size has worn to the limit Size (interference size when the pin and pin holes are assembled is generally in the range of 0.01-0.02 mm); 4. The piston surface has serious scratches, or the diameter wear has exceeded the standard value. Such as the 485 type and 481 type diesel skirt skirt standard values ​​are 0.045-0.075 mm, 0.033-0.050 mm, skirt ellipticity standard values ​​were 0.20-0.24 mm, 0.10-0.13 mm.
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