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RANGER 2020 STRANGE NOISE

castlemusic23

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Hello,
Can someone here figure out what is this beeping/squeling noise?
Thanks

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P. A. Schilke

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Hi Ismeam,

This is another example of using the mechanics stethoscope without the steel probe and diaphragm. The ear pieces and tube are very directional and you can likely home in on the source of this noise quite quickly...

Best,
Phil
 

Markubis

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Does it change rythym if you increase the rpms?

My initial thought was that it sounds like a high pressure air leak like something around the AC compressor, but the rythym of it doesn't match the rotation of the serpentine belt.
 

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Did you make sure your blue jay is installed correctly? Lol
 


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castlemusic23

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Noise (blue jay jeje) is coming from where it says "made in usa"
20230218_175942.webp
 

RangerBill

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Noise (blue jay jeje) is coming from where it says "made in usa"
20230218_175942.webp
That is the OAD (overrunning alternator decoupler) pully, that drives the alternator. May be going bad or belt slipping.
 

airline tech

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Alternator - Coupling and Decoupling - (OAD Pulley)
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