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Discussion Starter · #1 ·
Posting this here from the introductory forum in hopes of getting more eyes on it:

My alternator begins "gunning" (clicky sound like a machine-gun) when put into R or D and pressing the brake pedal; the noise appears to go away when put into P or N. Here is 2 videos of the noise:

1. https://www.youtube.com/watch?v=ikGdbKH_6C0

2. https://www.youtube.com/watch?v=R0PVwMz_O08 <-- most noticeable noise here (with brake pedal pressed)

In video 1, I only engaged parking brake but did not press the brake pedal all the way. In video 2, both parking brake is engaged and brake pedal is pressed all the way. I think it's a bad alternator (alternator pulley?)? Because my current battery is only 1 year old. Also brand new serpentine belt, less than 3k miles on it. Thoughts?
 

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04-05 Pedal Insert
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5,767 Posts
Could be a bad pulley bearing or a bad tension-er piston
 

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Discussion Starter · #3 ·
FIXED! Tensioner related? Absolutely! Quick video montage of noise/fixing process:

https://www.youtube.com/watch?v=xpvxnd5DUzs

So looks like it was a bad bearing on the tensioner pulley. I think I would have been fine with just replacing the pulley itself, based on the visual inspection. However, I would have to order an OEM pulley which probably would cost more than the one from my local auto body parts store (its aftermarket; same overall dimensions but slightly different internal dimensions). In fact, it looks like Nissan only sells the whole assembly @ $80, whereas my aftermarket pulley assembly was $50.

Nissan USA eStore

After watching the video, do you guys think replacing JUST the pulley would have solved the problem? It looks like that black plate/bearing was off... but at that price point I think it was worth it to swap a whole new assembly.
 

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2008 2.5S Sedan w/CVT
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253 Posts
Nicely done. I'd say it was the right call to change the whole assembly. For all we know it might be the tensioner that's gone bad and led to the bearing in the pulley wearing out. That was some serious wiggling on the old bearing!
 
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