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I have a device that which I believe can capture the harmonics that you are talking about. If there is a break in the weather today, I may run some tests.

Thanks for the cat codes. I will order and throw the hard pipe in as a spare. God forbid something goes wrong with the flex.

Sorry, I meant the fittings. I replaced them, and they did not come with an O ring. The original fitting O rings were questionable.

I ran the thermometer along the flex tubing and it was in the 160's F at the block and 170's at the governor. Probably would go higher with warmer ambient temps and engine load.

From what I see here, the ID is kind of nominal with steel. OD (in) Gage (in) ID (in) Weight (Lbs/Ft.) C-1010 Steel Pressure Rating (PSI) 5/8 .083 Wall 0.459 0.4810 3,350 3/4 .095 Wall .120 Wall 0.560 0.510 0.6646 0.8070 3,150 4,110 r4Note that in order to have around 1/2" ID with...

I.D. diameter is was one of my concerns when the fix was documented. Using the documentation that you provided, it would appear that that the hydraulic hose as a more consistent I.D. The I.D.. on tubing appears to be more of a nominal number, varying significantly with O.D. Based on that info...

For those using the OEM line replacement and want to replace the straight and 90 degree fitting, the cost is about $20.50. I believe the part numbers are 6v8628 and 6v8647. I will double check those numbers tomorrow.

Why would you want to connect it to the head? You want that portion as sound dead as possible. Connecting to the head will increase the intensity of the vibration. I'd anchor off something else and dampen the clamp inside with butyl rubber.

I just put that part on yesterday. It's genuine CAT. After examining it and how it fits, I am going to replace both fitting at each end. I am talking to CAT this AM. The O rings appear flattened / worn down. Metric O rings did not fit theses parts well. Possibly SAE. Nevertheless, I am realizing...

Clamp with dynamat dampener maybe.. Love physics. I'm going to test my tube for cracks with magnaflux. Just have not gotten to it yet.

Maybe dampen with dynamat or similar?

Or resonance between the engine and component.

Exactly. Stainless strands vibrating on other strands can lead to failure. Vibration reduction is paramount. So is a low pressure warning system just after the tube.

As I look at this line, I think the issue is likely resonant vibration. Transmitted between the block and the governor. If the resonance could be dampened, the line might last longer. Not an expert in this area, but that pounding sound of the diesel is probably with harmonics, mostly in the...

Mirror or camera. May even remove tube to inspect.

I'm going with replacing with original line and a magnaflux of the line with every oil change.

Maybe a hydraulic hose /braided? donno... Nah, I've got another idea.

You talking about marriage? lol