Krank tork anahtarıyla sıkıldı.

Here sıkıldı is best understood as was tightened.

It breaks down like this:

• sık- = the verb stem, from sıkmak
• -ıl- = a passive/reflexive-type suffix
• -dı = past tense

So:

• sıktı = he/she/it tightened
• sıkıldı = it was tightened

In a mechanical sentence like this, sıkıldı is a very natural way to say that something was tightened.

Because in this sentence krank is the subject of the passive sentence, not the direct object of an active one.

Compare:

• Active: Usta krankı tork anahtarıyla sıktı.
  The mechanic tightened the crank with a torque wrench.

• Passive: Krank tork anahtarıyla sıkıldı.
  The crank was tightened with a torque wrench.

In the active sentence, krankı is the direct object, so it takes the accusative ending.
In the passive sentence, krank becomes the grammatical subject, so there is no accusative ending.

-yla here means with or using.

So tork anahtarıyla means:

• with a torque wrench
• using a torque wrench

This -yla is a fused form of ile, which also means with.

So these are equivalent:

• tork anahtarıyla
• tork anahtarı ile

The attached version is very common in everyday Turkish.

Because tork anahtarı is a noun compound meaning torque wrench.

Turkish often forms this kind of compound like this:

• first noun: tork
• second noun: anahtar
• compound form: tork anahtarı

That final -ı on anahtarı is part of the compound structure.

Then ile attaches to the whole compound:

• tork anahtarı + ile
• becomes tork anahtarıyla

So anahtarıyla is not random: the -ı belongs to the compound, and -yla means with.

Yes. That is completely correct.

Both are natural:

• Krank tork anahtarıyla sıkıldı.
• Krank tork anahtarı ile sıkıldı.

The version with the suffix attached, -yla, is often a little smoother and more common in normal speech and writing.

Because Turkish does not have a definite article like English the.

So krank can mean:

• the crank
• sometimes a crank, depending on context

In this kind of technical or procedural sentence, the noun is often understood as definite from the situation. The listener already knows which part is being discussed.

If Turkish wants to make something explicitly indefinite, it can use bir:

• Bir krank tork anahtarıyla sıkıldı.
  = A crank was tightened with a torque wrench.

But in many real sentences, Turkish simply leaves that to context.

Yes, and that is a very common learner question.

Sıkılmak can mean:

• to be squeezed / compressed / tightened
• to get bored

So sıkıldı can mean:

• was tightened
• got bored

You know which meaning is intended from the context.

For example:

• Cıvata sıkıldı.
  = The bolt was tightened.

• Toplantıda sıkıldı.
  = He/She got bored in the meeting.

In your sentence, because of the mechanical vocabulary krank and tork anahtarı, the meaning is clearly the mechanical one.

Because this is a passive sentence, and passive sentences often leave the doer unstated.

This is true in English too:

• The crank was tightened.

You can add the doer in Turkish, but often you do not need to, especially in technical instructions, reports, or descriptions.

If you really want to mention the doer, you could say something like:

• Krank usta tarafından tork anahtarıyla sıkıldı.
  = The crank was tightened by the mechanic.

But tarafından can sound formal or heavy, so Turkish often prefers the active sentence instead:

• Usta krankı tork anahtarıyla sıktı.

No. Turkish word order is flexible, although some orders sound more neutral than others.

The original sentence is very natural:

• Krank tork anahtarıyla sıkıldı.

You could also say:

• Tork anahtarıyla krank sıkıldı.
• Krank sıkıldı tork anahtarıyla.
  This is possible, but less neutral in many contexts.

A good rule is:

• the verb often comes at the end
• other elements can move for emphasis or focus

So the original version is a normal, straightforward order.

A natural active version would be:

• Biri krankı tork anahtarıyla sıktı.
  = Someone tightened the crank with a torque wrench.

Or, if you know who did it:

• Usta krankı tork anahtarıyla sıktı.
  = The mechanic tightened the crank with a torque wrench.

This can help you see the passive more clearly:

• Active: krankı = object
• Passive: krank = subject

That active/passive relationship is one of the key grammar points in this sentence.