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Preposition before noun

Of engine or in engine

These combinations are used in different grammatical situations. Of engine is uncommon alone but appears in technical noun phrases. In engine usually means inside an engine or within an engine system.

Quick answer

How are of engine and in engine used?

Use in engine to describe something located or happening inside an engine. Of engine is uncommon by itself but may appear in technical expressions such as failure of engine components. More natural patterns are engine of or in the engine.

There was oil in engine parts after the test.
the failure of engine components
Smoke appeared in the engine compartment.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
in engine + system/context

Describing location inside an engine

In engine is mainly technical and usually appears before another noun.

an in engine cooling process
sensors used in engine diagnostics
2
in the engine

Talking about physical location

Use in the engine for something physically inside the engine.

There was a leak in the engine after the race.
A strange noise started in the engine yesterday.
3
of engine + noun

Technical description

Of engine may occur in formal technical phrases, usually before another noun.

the vibration of engine parts
the temperature of engine oil

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
of engine
The vibration of engine parts increased.
technical phrase describing parts or properties
in engine
In engine testing, fuel quality matters.
technical context within engine systems
in the engine
There is water in the engine.
physical location inside the engine
engine of
the engine of the aircraft
the engine belonging to something

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using of engine as a general phrase

Of engine alone sounds incomplete in most contexts.

✕ the sound of engine ✓ the sound of the engine

Confusing in engine and in the engine

In the engine is more natural for physical location.

✓ There was damage in the engine.

Missing an article before engine

Engine often needs a or the in ordinary sentences.

✕ Smoke came from engine. ✓ Smoke came from the engine.

Quick practice

Choose the expression that matches the intended meaning.

1. There was a strange smell ___ the engine.
2. The vibration ___ engine parts increased.
3. ___ testing requires special equipment.

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Frequently asked questions

Is of engine correct English?

It is uncommon alone but may appear in technical phrases such as vibration of engine parts.

What is the difference between in engine and in the engine?

In engine is mainly technical before another noun. In the engine refers to physical location inside the engine.

Which phrase is more common in everyday English?

In the engine and engine of are more natural in everyday use.

of, about, against, to or for racism? of, about, for, in or on friendship? of, about, for, on or to thing? of, about, for, to or with sex? of, about, on, to or for moon? "of access" or "with access"? "of accommodation" or "for accommodation"? "of accuracy" or "for accuracy"? "of action" or "in action"? "of actor", "with actor" or "by actor"? "of address" or "to address"? "of administration" or "in administration"?

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