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  #1  
Old 06-14-2016, 03:27 AM
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MY12 Engine Harmonic Noise

Just spent 15 hours driving over 2 days at all most constant 100km/hr. This morning I notice the engine has developed a strange harmonic noise.

This seems related to velocity of fluids/gases in the associated pipe; as it disappears at 100km/hr. Although I'm not sure what role it performs.

As the video shows I can stop the noise by holding the pipe.

Any idea what the pipe does? And is that a precursor to a downstream issue?

thanks
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  #2  
Old 06-16-2016, 04:22 AM
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Re: MY12 Engine Harmonic Noise

The noise has disappeared as fast as it arrived. Although still keen to understand the function of that pipe.
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Old 06-20-2016, 04:44 AM
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Re: MY12 Engine Harmonic Noise

Crap the noise has come back.....

Still need to work out what that pipe does.
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Old 06-20-2016, 05:25 AM
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Re: MY12 Engine Harmonic Noise

I've never seen a 3.0 up close but it sure looks like a/c lines from what little I saw of them. Can you follow them to the a/c compressor, dryer, or where do they terminate? Can you post some more pictures of more of the line?
Whatever it is I would check all the bolts that mount those lines along their path (Incl. on the compressor or dryer if that's where they go). I see what looks like rubber isolators in the center of the picture. If so, check to see if the rubber has dry rotted or deteriorated to the point that they're not doing their job. Same with any others along the path of the lines.

It could also be the bearing in the a/c compressor (if that's where it goes) and holding the line changes the harmonics just enough to change the sound. (Kind of sounded like a spinning noise) That's probably a long shot though. Check the bolts holding the compressor to the engine. If it goes to the dryer, the bolts holding the dryer to the inner fenders or wherever it's located could be loose, allowing harmonics in the lines.
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Old 06-20-2016, 06:37 AM
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Re: MY12 Engine Harmonic Noise

Thanks for the response, the pipe are cool so I think you may be correct.
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Old 06-25-2016, 02:54 AM
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Re: MY12 Engine Harmonic Noise

Mine has had the same harmonic for many thousands of kilometres, ended up slightly changing the locating bracket and then also placed rubber around the lines to protect them and used zippy ties to alter the angle and get rid of the noise.
I believe its the fuel line you are touching.
mine has now done north of 212,000 kilometres and developed this noise at 140,000
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Old 06-25-2016, 03:05 AM
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Re: MY12 Engine Harmonic Noise

http://www.allpar.com/photos/mopar/VM/V6-diesel.jpg



Amateur at this trying to place an image of the motor on here...
its the fuel line from the high pressure fuel pump.
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Old 06-25-2016, 03:09 AM
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Re: MY12 Engine Harmonic Noise

it is the fuel line coming from the high pressure fuel pump.
mine had the same noise many thousands of kilometres ago.

fixed by my super handy service manager at the local Jeep dealer.
changed the angle and put on some additional clamps along the lines.
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Old 06-25-2016, 03:34 AM
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Re: MY12 Engine Harmonic Noise

Thanks for the response, from the sound of it (no pun intended) its more an annoyance than an underlying issue. That's great news.
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Old 08-04-2016, 06:42 PM
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Re: MY12 Engine Harmonic Noise

Well I can report it has stopped. Engine now has 80K km and seems to be going strong.
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