Identify the part plz

[hunchback]

Hi there,

I recently had the timing belt replaced on my 03 NSX, this brief context might be useful. Today I was changing the oil and noticed the sleeve/lug assembly pointed out in the attached picture. The sleeve was loose and I threaded it tight on the lug. However, I am clueless as to what it is. I would appreciate if someone can identify what this is and why would it be loose?

This is right by the oil dipstick.

 

[davidf]

That is the belt tensioner adjuster. When you loosen the pulley bolt, you can loosen/tighten the belt with this. Turn it to the left to loosen, right to tighten.
Just snug it back up.

 

[hunchback]

That is the belt tensioner adjuster. When you loosen the pulley bolt, you can loosen/tighten the belt with this. Turn it to the left to loosen, right to tighten.
Just snug it back up.

Thank you very much. I appreciate your response.

 

[DDozier]

To be more specific it is the AC belt tensioner, and had to be removed to access the timing belt.

Dave

 

[OLDMNSX]

The A/C belt tensioner pulley is also a common source of noise in the engine compartment. People have a tendency to tighten them too much which wears the bearing out.
Brad