Serpentine belt rattle

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#1
I have an 08 fusion with a 2010 fusion 4 banger engine in it. When I swap the engine I have an belt rattle when its idling. But when I press the throttle the rattle stop. What could be the rattle problem. I switch tensioners twice no,change.

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Thread Starter #6
So changing out #5 on the diagram will make the clacking/rattle noise go away? Its on the when the car is idling at a complete stop. But soon as I press the gas it goes away. I can see the belt jumping right by the belt tensioner as it passed the tensioner and could also see the tensioner itself vibrating when the car is running.


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FusionFan

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#7
The only way to really find out is to replace the parts, idler pulley do go bad because the ball bearings inside wear down. Plus the part is really cheap.
 
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Thread Starter #8
I've been seeing only it could be the belt itself. Get a smaller belt made for the 08 and should correct the rattle

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Thread Starter #10
What size belt do I need? I just brought the 4060882 its a lil bit to short and I brought the 4060868 and it was shorter than the 4060882. I do have the 2.5l engine out the 2010 fusion in my 08 fusion. The original engine is 2.3l

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Thread Starter #11
But I did buy a larger idler pulley it quiet it down when I put in gear but when I turn the a.c. on the rattle comes back.

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Thread Starter #13
I tried two different size sizes they claim fit my car. I tried one for 2010 fusion 2.5l engine (which I have in the car now) and tried another belt for the 08 fusion 2.3l engine. I did swap my 08 2.3l engine to a 2010 2.5l. Got a belt that fits but still rattles

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FusionMike

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#14
Try tightening the belt tension a bit more. I wondering if it could be the compressor that's making the noise and not the belt.


I tried two different size sizes they claim fit my car. I tried one for 2010 fusion 2.5l engine (which I have in the car now) and tried another belt for the 08 fusion 2.3l engine. I did swap my 08 2.3l engine to a 2010 2.5l. Got a belt that fits but still rattles

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