# crankshaft

/ˈkɹæŋkˌʃæft/ (US) · /kɹˈæŋkʃɑːft/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/crankshaft
Updated: 2026-05-26

## Definition

a long metal bar with arms that turns the power from an engine into a circular motion. It is a key part of a car's engine that helps the wheels move.

For teachers: a long metal shaft with a series of cranks and journals, used to convert reciprocating motion into rotary motion. It is a fundamental component of internal combustion engines and steam engines.

## Examples

- The mechanic replaced the worn crankshaft in the engine.
- A damaged crankshaft can cause the engine to seize, requiring a complete engine rebuild to restore functionality.
- Modern high-performance engines utilize forged steel crankshafts to withstand the immense torsional stresses generated by high-revving combustion cycles and heavy turbocharging.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.