High Pitch Whistle - Ford Powerstroke Diesel Forum
6.0L Ford Excursion Discussion This forum is for topics relating to the excursion only.

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post #1 of 6 Old 09-17-2019, 01:28 PM Thread Starter
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High Pitch Whistle

When my Excursion with a 6.0 reaches 218 degrees I get a high pitch whistle. This only happens when towing our 10,000# travel trailer and going up a hill. So high load. Engine is new, turbo is newer, it did it with old engine and 3 different turbo. The cooling fan also is on. Anyone have any ideas?
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post #2 of 6 Old 09-17-2019, 02:50 PM
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Charge air cooler tank gasket blown out -- one of the turbo boots split -- plastic charge air tube split in the bellows -- exhaust gasket leak -- up pipe bellows split

Take your pick -- these are some of the things that could make that noise
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post #3 of 6 Old 09-17-2019, 03:22 PM Thread Starter
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I will have to check these out. Turbo boots have been replaced a couple of times and does not make a difference. Thanks!!
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post #4 of 6 Old 09-18-2019, 05:14 AM
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OK, thanks for the info. To show my ignorance, what is the problem with 3 nipples...
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post #5 of 6 Old 09-18-2019, 06:08 PM
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Quote:
Originally Posted by k94x4 View Post
When my Excursion with a 6.0 reaches 218 degrees I get a high pitch whistle. This only happens when towing our 10,000# travel trailer and going up a hill. So high load. Engine is new, turbo is newer, it did it with old engine and 3 different turbo. The cooling fan also is on. Anyone have any ideas?
I have had a failing fan clutch make a high pitch squeal when under full lock up.

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post #6 of 6 Old 09-24-2019, 08:06 AM
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This whistle was caused by a slick fan pulley and a old serpentine belt:


Only appeared when towing up a hill at 11k. A couple others who had a squeal like this said scuffing the pulley fixed it. I wish the water pump was turned by the slotted v side of the belt verses just the slick side. Probably would never squeal.

This is what to do to fix the sound:

http://www.bulletproofdiesel.tv/File...Tech%20Tip.pdf

Took me about 4 hours to swap those parts, but I spent a lot more time and a lot more money than I needed to hunting down exhaust leaks and boost leaks that were not the issue.

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Last edited by ChrisSki; 09-24-2019 at 08:12 AM.
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