Engine loud wistle/squeal - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 07-26-2012, 10:29 AM Thread Starter
JJD
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Engine loud wistle/squeal

I read past post about this but was wondering if anyone else has this problem and what they did to correct it.

I have a 2001 7.3 225000 miles.
Only under a load does it wistle or squeal so loud it makes you want to pull over. It happens when the truck down shifts but as soon as you let off the accelerator it quits and it mostly happens in warm to hot weather. At first i thought it was the transmission, but now that i have read some post i am leaning towards the belt. Has anyone changed the belt, tensioner, water pump pully and had sucess at solving this? Also someone metioned fan clutch?

If anyone could give me some info I would appreciate it, I"m getting ready to leave on vacation and pulling my camper I would love to have this taken care of before I left. Thanks
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post #2 of 14 Old 08-01-2012, 08:56 AM Thread Starter
JJD
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Ok, I guess i am the only one with this problem. Here is some more info hopefully someone can help me out.

I pulled my camper and it seems to make the noise when the truck is running in warm to hot weather when it down shifts on a hill or to pass. Also at this time the fan clutch seems to cycle alot. When i drove at night it did not seem to happen as much. I dont know for sure how the fan clutch is suppose to work, or if it could not be working right. Because it does not seem to make the noise if the fan clutch does not cycle.

If anyone has any input please let me know. Thanks
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post #3 of 14 Old 08-01-2012, 10:33 AM
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My 01 7.3 does the same thing if the RPM's get too high while under a load. not sure why this happens unless we are creating a leak on the inlet of the turbo from it having high suction around the rubber boots. I would like to know more about it too.

Frank
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post #4 of 14 Old 08-01-2012, 12:47 PM Thread Starter
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Hopefully someone will have some ideas. I am searching other forums also, I will post what i find out to try and help you.
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post #5 of 14 Old 08-08-2012, 08:38 PM
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I have had an intermittent squeal also in a 97 F-350 4X4. I have changed both idler pulleys, belt tensioner (2X), belt (4X), alternator (with pulley), water pump (2X), vacuum pump, vacuum pump pulley (2X), power steering pump, and cleaned the belts and pulleys MULTIPLE times. I am getting tired of throwing money at this thing.

My squeal comes in under power and at about 1600 RPM and goes away when the truck shifts to the next gear. I am at a loss and am needing to get this thing ironed out. Hope this helps or maybe something you have done can help me out.
Thanks all!
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post #6 of 14 Old 08-08-2012, 08:41 PM
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In all yalls problems is the Air Conditioner running?

2001 F-250 7.3. Garrett GTP38R ball bearing turbo, MBRP 4" exaust, muffler delete mod, Bully Dog 6 pos. chip, Edge CTS, 4" suspention lift, and moto metal 20's w/ 35/12.50/20 nitto Trail Grapplers
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post #7 of 14 Old 08-15-2012, 10:15 PM
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I've had this same problem.... Only under load of accelerating from rolling slow speeds with no AC on.... I read it could be turbo boots with a crack or tear or exhaust up pipe leak??? Not sure.... Anyone?

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post #8 of 14 Old 08-16-2012, 05:37 AM
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Make sure your guys turbos are on the fringe of blowing, with all of this squeeling your hearing under high boost. Check the compressor blades and shaft.
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post #9 of 14 Old 08-18-2012, 03:13 PM
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Hadn't even thought about that. I did notice the other morning that I couldn't make it happen. It was cool and a bit damp (after a good rain).

What would be the best procedure for checking shafts and blades on a turbo?
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post #10 of 14 Old 08-20-2012, 06:40 AM
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Pull the intake and look at the blades and grab it to check shaft play.
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