TS ISO 7967-3

TS ISO 7967-3 is a terminology standard for the technical language used for valves, camshaft drives and valve actuating mechanisms in reciprocating internal combustion engines. It provides a controlled vocabulary for engineering drawings, specifications, maintenance documentation and communication across the engine field.

Why valves, drives and actuating mechanisms are treated separately

In general technical terms, valves control the intake and exhaust gas exchange in an engine, while the camshaft drive and its related actuating mechanism ensure that the valves open and close at the correct time. Although these subsystems work together, they serve different functions and use different design concepts. A vocabulary standard helps prevent ambiguity when referring to parts such as a valve spring, cam profile or operating lever.

What this part covers

According to the supplied scope, this document defines terms relating to the valves, camshaft drives and actuating mechanisms of reciprocating internal combustion engines. It is therefore a terminology document rather than a test, design or performance standard. Its practical value lies in consistent naming, especially where different engine architectures or manufacturer conventions might otherwise use different wording for the same component.

• Provides common terminology for valve-related parts and assemblies.
• Organises the language used for camshaft drive systems such as chains, belts or gears.
• Clarifies distinctions between different valve actuating mechanisms.
• Supports a consistent vocabulary aligned with the wider engine terminology series.