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Old 04-19-2016, 09:56 PM   #1
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High pitch squealing at top of Fancy Gap

Climbing to Fancy Gap WV this trip (I-77 heading north to the gap) we had a strange noise.

Near the top of the climb I started to get a high pitched squeal coming, ( I think) from the engine compartment. I backed off the gas and it let up for a moment but started again. It stopped after cresting the mountain. Climbing hills later with steep climbs, and engine in a low gear roaring away, we got no squeal. It only happens at higher altitude.

We have 2011, 22,000 chassis with the Triton V-10.

Anyone else experience this? It sounds all the world like a bearing but I'm starting to think it might be a small leak in the air box or manifold (leaning this way mostly because it never happens at lower altitudes).

Gary
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Old 04-21-2016, 10:37 PM   #2
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I had that on a V-8. Turned out to be the air cleaner assembly.
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Old 04-22-2016, 10:34 AM   #3
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Quote:
Originally Posted by Duckogram View Post
I had that on a V-8. Turned out to be the air cleaner assembly.

I would be greatly relieved to find its nothing more than thin air trying to satisfy a huge air pump that can't get enough oxy, (the Triton V-10).

I'll keep my fingers crossed.

Thanks,

Gary
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Gary, Cindy, Reacher (Maine Coon), and Vivian (in spirit only now).
Retired: July 31st, 2013 and loving it.
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Old 04-25-2016, 06:20 AM   #4
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Does your rig use a Fan clutch of some type?If the fan is calling for as much HP as can be fed it you could have a belt that is not in the best of shape --bottoming in the grooves etc. These conditions would be met after a long climb. I personally discount the air theory since it would be occurring all the time or at least at hard acceleration on flatland.
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Old 04-27-2016, 08:04 PM   #5
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Does your rig use a Fan clutch of some type?If the fan is calling for as much HP as can be fed it you could have a belt that is not in the best of shape --bottoming in the grooves etc. These conditions would be met after a long climb. I personally discount the air theory since it would be occurring all the time or at least at hard acceleration on flatland.

You don't think the higher altitude has anything to do with it then? It only happens at that point of high altitude.
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Gary, Cindy, Reacher (Maine Coon), and Vivian (in spirit only now).
Retired: July 31st, 2013 and loving it.
__________________________________________
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Old 04-27-2016, 08:54 PM   #6
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I think you got to that high altitude by climbing there making the cooling system work at maximum.Though tighten by a spring tensioner if the belt's "Ridges" are worn to the extent that they don't match the contour of the pulley's they won't be able to transmit the full load of a fan at maximum speed.I'm hoping this applies to you as there may be some rigs out there that only have electric fans??then back to your air leak.
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