Loud Squeal 6.0 2005 F350 I Need your opinions

[Munfrobie]

Here is my best description of a reoccurring issue that I cannot get the dealer to recreate. This has been going on for as long as we have owned the truck and seems to be increasing in pitch. Yet it’s extremely intermittent.
With a load in tow, more than not. But rarely when driving locally, but it will occur. At a torqueing (spelling) low speed 20- 40MPH not speeding up and not slowing down speed. Just that point where you add throttle.
In the front area of the truck I hear a short 15 second and stop after throttle change, loud squeal (IMO) a bearing squeal not a whistle if a whistle it is a good one (IMO).
The longest this noise was present was on a steep winding 15 -20 mph climb up hill @ 2 miles it squealed (lack of a better term) every time I applied throttle and stopped when I released. But the climb was so significant I had steady throttle low speed low crawl, and I heard the steady squeal. Loud enough to echo to the side of the road and be well heard in the cab.
My truck is an F350 DWL with 60K A weekend driver. Very clean under the hood. I have had the tensioner bearings, PWR Steering pump and belt replaced. We just got the HG and oil cooler replaced (ARP bolts added). Brakes are good etc. General overall condition is well kept and clean.
I have looked at the turbo and other engine plastic pipes, the inter cooler boots, and see no visible cracks or signs of aging.
Besides dragging the trailer to the dealer I am at a complete loss. Dragging the trailer to the dealer is my last resort but may be my only option. In January I am out of warranty.
The noise was heard after the HG change.

[Nubbs]

Does this coincide with the clutch fan coming on/off?

[Munfrobie]

That is an interesting question. I have been making friends with the local Diesel mechanic and he was suggesting the same thing. He reached into the shroud and said there was ever so slight a bit of play in the clutch fan. Now this guy is the local big rig cranberry farmer’s mechanic and has a well know rep. I never thought twice about his input. How can I find out if the fan is the culprit?

[nitrogen]

if any of the intake clamps that are under boost are slightly loose they can squeal just like making a whistle out of a grass stem. it can be hard to spot a loose clamp because they stick to they hose even if they're broken, so back them off and retighten, making sure they torque up. i had a big cat that sounded so bad we thought the turbo was shot, it was only a broken clamp

[Munfrobie]

This Forum has a wealth of information. I have identified based on repeat forum postings that I may be experiancing the "Tea Kettle" sound so commonly related to clutch fan / belt issues. (my belt has been changed a few times durring service) Oh and my Y pipe was already identified and repaired. (Could it have failed again?)

It seems to be another one of those "unable to be recreated at the dealer" issues. Many of the posts I have found have no responses as to what the fix was. Many are pointing to the general 05 year models.

I am going to call the service manager this am and use my new words "tea Kettle" with him and see if he has a better response.

However I am now curious if any current posters have experianced this and was it related to the clutch fan. And even more, what was the repair?

[Nubbs]

I had a situation under high load, high rpm, high outside temp (100+) when climbing a steep hill, I would hear the "squeel" noise, the clutch fan would lock in and the rpm would drop a bit and the squeel would go away. When the clutch fan turned off, the rpm would go up a bit and the "squeel" would start again. The process kept repeating. I just figured it was the belt slipping as I never found any signs of coolant leaking.

[Lazyl]

Originally Posted by Munfrobie

Here is my best description of a reoccurring issue that I cannot get the dealer to recreate. This has been going on for as long as we have owned the truck and seems to be increasing in pitch. Yet it’s extremely intermittent.
With a load in tow, more than not. But rarely when driving locally, but it will occur. At a torqueing (spelling) low speed 20- 40MPH not speeding up and not slowing down speed. Just that point where you add throttle.
In the front area of the truck I hear a short 15 second and stop after throttle change, loud squeal (IMO) a bearing squeal not a whistle if a whistle it is a good one (IMO).
The longest this noise was present was on a steep winding 15 -20 mph climb up hill @ 2 miles it squealed (lack of a better term) every time I applied throttle and stopped when I released. But the climb was so significant I had steady throttle low speed low crawl, and I heard the steady squeal. Loud enough to echo to the side of the road and be well heard in the cab.
My truck is an F350 DWL with 60K A weekend driver. Very clean under the hood. I have had the tensioner bearings, PWR Steering pump and belt replaced. We just got the HG and oil cooler replaced (ARP bolts added). Brakes are good etc. General overall condition is well kept and clean.
I have looked at the turbo and other engine plastic pipes, the inter cooler boots, and see no visible cracks or signs of aging.
Besides dragging the trailer to the dealer I am at a complete loss. Dragging the trailer to the dealer is my last resort but may be my only option. In January I am out of warranty.
The noise was heard after the HG change.

All sounds too familar. I have a 04 6.0 that does the same thing but always in a tough boost need, up a steep grade or in a high headwind. Dealer cannot duplicate it on on dino. They have replaced the turbo, three EGR values, the fan clutch and nothing has done any good. For three years it did not do it. Then with the fuel change in sulfur, it started and I hear the high whinning sound and lose power. I started adding cetane boost to the fuel and now I get the whin but do not lose power. So I just give up and let it go. I just came off a 3,000 mile trip and it gets me to and from fine. I have read so many threads of heads going bad, fuel filters, bad fuel, cracked hoses, and more and more. Everyone has a similar problem with this engine. Good luck. If you find a permanent cure let us know. I got so frustrated I wrote the Ford Co CEO. His office actually replied, set up a appointment with my dealer, told the dealer what to look for per their 6.0 engineer, and still nothing.

[matts156]

Since these engines have a propensity to blow the boost tube off, I would suspect it's coming from somewhere in that circuit. It may not even be a broken clamp, just one that's not tight enough (especially with expansion and contraction from heat) to make a complete seal and enough air is getting through to make the tube squeal. I could be miles off, but I think it's a good possibility.

[CCEMT-P]

We just had the same problem on our 6.4. And it started right after they changed the oil cooler. Seems they loosened the exhaust while working on the cooler and forgot to tighten it up when they were done. I know it sounds weird, but after they tightened it up, the squealing was gone.

[BrianAnderson]

I am currently waiting on a new turbo for the exact same thing. Only while towing, usually on long pulls at normal speeds, it would start making noise. I pulled the turbo, and there was a lot of play in the bearings. I guess the boost from towing would cause the compressor to rub a little. Running around town empty, I had no trouble, and turbo would spool and run just fine.

You can check your turbo by pulling the intake boot off, and try moving the shaft up/down or in/out and check for play.

[Munfrobie]

I like the oil cooler thought. However three weeks after the oil cooler was changed I had my head gaskets replaced. I suspect they may have had to touch the exhaust bolts on that one again? I also know by my oasis report the turbo was replaced with the last owner (need to read that thing again to see why). My boots, engine and general overall condition is clean and new looking.
We hauled this weekend. I was generally considerate of the coolant temp and RPMs. No squeal! Well not until we rolled up to or site and I crawled forward to adjust for my back-in at the crawl forward I heard the bugger! Hmm! Could it be heat and clutch fan because I was so careful not to push up the temps? Could it be turbo boost? Odd at that speed. I am not a mechanic but have certainly learned more about Diesel engines than I ever figured I would have too. I have not read one post on this that tells of anyone finding the cure. Certainly a wealth of parts have been shot gunned at the problem. I am pleased to hear it has not stranded anyone yet.
I also just filled up and added the fuel additive before I left. You got me thinking on that one too now…..

[bfloyd4445]

Originally Posted by Munfrobie

Here is my best description of a reoccurring issue that I cannot get the dealer to recreate. This has been going on for as long as we have owned the truck and seems to be increasing in pitch. Yet it’s extremely intermittent.
With a load in tow, more than not. But rarely when driving locally, but it will occur. At a torqueing (spelling) low speed 20- 40MPH not speeding up and not slowing down speed. Just that point where you add throttle.
In the front area of the truck I hear a short 15 second and stop after throttle change, loud squeal (IMO) a bearing squeal not a whistle if a whistle it is a good one (IMO).
The longest this noise was present was on a steep winding 15 -20 mph climb up hill @ 2 miles it squealed (lack of a better term) every time I applied throttle and stopped when I released. But the climb was so significant I had steady throttle low speed low crawl, and I heard the steady squeal. Loud enough to echo to the side of the road and be well heard in the cab.
My truck is an F350 DWL with 60K A weekend driver. Very clean under the hood. I have had the tensioner bearings, PWR Steering pump and belt replaced. We just got the HG and oil cooler replaced (ARP bolts added). Brakes are good etc. General overall condition is well kept and clean.
I have looked at the turbo and other engine plastic pipes, the inter cooler boots, and see no visible cracks or signs of aging.
Besides dragging the trailer to the dealer I am at a complete loss. Dragging the trailer to the dealer is my last resort but may be my only option. In January I am out of warranty.
The noise was heard after the HG change.

I wonder if this dosent happen at the same RPM? What about the vibration damper? they can cause hard to find funny noises.

good luck.