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2010 Nissan Armada SE
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Discussion Starter · #1 ·
Picked up a 2010 Armada about a month ago with 137k. There is a slight rattling noise that I have traced to the crankshaft pulley/harmonic balancer. When I take the belt off and start it without the belt there is no noise at all. It also looks like there is a slight (tiny) wobble in of the crankshaft pulley but only when the serpentine belt is attached.

Could that be a bad belt or tensioner? Never had an issue with something like this.
 

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Hard to diagnose something like this on the interwebz. With belt off check any/all tensioners. There should be some resistance to rotation. If any one of them rotates freely, or has any play when you try to move it out of its plane of rotation then it's likely bad.
 
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