Internal combustion engines; Piston rings; Part 2 : Inspection measuring principles

This document establishes the specific examination protocols governing piston rings designed for internal combustion engines. It defines the systematic procedures required to assess the dimensional accuracy, surface integrity, and functional characteristics of these critical engine components. The scope encompasses detailed inspection criteria applicable to newly manufactured units as well as those undergoing quality verification during production. Methods outlined include measurements of ring gap, twist, and cross-section profiles using approved instrumentation techniques. The text ensures that evaluation processes yield consistent and reliable results across different manufacturing environments. It provides clear guidelines for sample selection and test conditions to maintain uniformity in product assessment. Adherence to these examination rules facilitates quality control and supports interoperability in engine assembly processes. The document serves as a technical reference for manufacturers, quality assurance personnel, and regulatory bodies involved in the production and validation of engine sealing components.