Overview
ISO 7967-2:2010 is part of the ISO 7967 series that establishes a standardized vocabulary for components and systems of reciprocating internal combustion engines. Specifically, Part 2 - Main running gear - defines and clarifies terms used for the primary moving parts of engines (pistons, piston assemblies, connecting‑rod mechanisms, crankshafts and other running gear). The document is bilingual (English/French) and organized to support consistent technical communication across design, manufacturing, maintenance and documentation.
Key topics and technical focus
This part of the standard is a vocabulary specification rather than a performance or design standard. Key technical topics covered include:
- Terminology for types of piston - e.g., piston, crosshead piston, one‑piece, multi‑piece, piston with controlled thermal expansion, articulated and two‑piece pistons.
- Piston components - definitions for piston crown, piston skirt, piston guide ring, piston ring (referencing ISO 6621‑1), piston bowl and related features.
- Piston details, connecting‑rod mechanism and crankshaft vocabulary - structured subsections (2.1–2.6) provide consistent names and short definitions for main running gear parts.
- Document structure and indexing - Scope, Terms and definitions, Bibliography and English/French alphabetical indexes to aid lookup.
- Reproduction/usage conditions - terms and definitions may be reproduced for educational or implementation purposes if unmodified and properly referenced, per ISO copyright notes.
Practical applications - who uses ISO 7967-2:2010
ISO 7967‑2 is used wherever precise, unambiguous terminology for engine running‑gear is required:
- Engine designers and OEMs - for clear component specifications and cross‑discipline communication.
- Technical writers and translators - to ensure consistent English/French terms in manuals, drawings and service literature.
- Manufacturing and quality teams - for parts lists, inspection documentation and procurement.
- Service, maintenance and training organizations - to align curricula, procedures and troubleshooting guides.
- Standards committees and regulators - as a reference vocabulary when developing related standards or regulations.
Related standards
- ISO 7967 series (other parts): Part 1 (Structure and external covers), Part 3 (Valves, camshaft drives and actuating mechanisms), Parts 4–9 (pressure charging, cooling, lubrication, governing, starting, control/monitoring).
- ISO 2710‑1 - classification of reciprocating internal combustion engines and basic terms.
- ISO 6621‑1 - referenced for the definition of piston rings.
Using ISO 7967‑2:2010 helps eliminate ambiguity in documentation and improves interoperability across engineering, manufacturing and regulatory workflows for reciprocating internal combustion engines.
Open preview (PDF)Reciprocating internal combustion engines — Vocabulary of components and systems — Part 2: Main running gear