turbo screech? - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 09-02-2013, 03:16 PM Thread Starter
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Question turbo screech?

I'm new to diesels and this site. I just testdrove a 2000 f350 ext cab flatbed are 6 speed manual 4x4. It drove good until about 2100 rpm then I heard some kind of screeching. Almost like brakes would make but I wasn't touching them at all. It continued to screech until I shifted. Then it stopped until I hit 2100 rpm again. Does anyone know what this is why it does it or if it is bad? 220k all stock. Former fleet truck. Thanks
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post #2 of 11 Old 09-02-2013, 03:32 PM
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I worked on a truck that did this exact thing. Ended up being the fan clutch was locked up. Shut the truck off and grab the fan and try to rotate it. It should have some resistance but spin fairly easy. If it is like the one I had, you had to pull hard on the fan to rotate it and the noise is where the belt spins on the pulley. It will be very noticeable if that is the issue.

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post #3 of 11 Old 09-02-2013, 03:38 PM Thread Starter
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Thanks! I'll have to go back and take a second look at the truck
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post #4 of 11 Old 09-02-2013, 03:43 PM
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post #5 of 11 Old 09-02-2013, 04:03 PM
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could be the compressor wheel contacting the housing?

if the fan clutch is a bust, take the intake tube off and take a look at the compressor wheel. if its chunked up and the housing has a wear mark id say you need a turbo rebuild.

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post #6 of 11 Old 09-03-2013, 09:22 AM Thread Starter
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Its at a dealership so I asked them to have their diesel mechanic check out the turbo and fan clutch. I just remembered the turbo was covered in soot. Any ideas on that?
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post #7 of 11 Old 09-03-2013, 05:55 PM
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Quote:
Originally Posted by Redlightning79 View Post
Its at a dealership so I asked them to have their diesel mechanic check out the turbo and fan clutch. I just remembered the turbo was covered in soot. Any ideas on that?
Soot or oil residue where the intercooler tubes connect?

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post #8 of 11 Old 09-03-2013, 06:14 PM
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leaking up pipes. mine is doing the same thing when the turbo builds boost. sounds just like what youre describing.

get under the truck and look up to where the manifolds go up towards the turbo. if you shine a flashlight from driver side up, you will probably see soot around the flanges.

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post #9 of 11 Old 09-03-2013, 06:23 PM
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id say soot or oil.
the ccv being drawn into the system really gets everything dirty.
and leaking up pipes do make a black mess.

99.5 f250 7.3 4x4 255k
PHP Phoenix, S&B, 4" Diamond Eye, Hpx, Stancor, RR Billet Wheel, RR AIH Delete, Autometer Gauges, Pro Comp leveled, Transgo Tugger, Billet TQ Converter, Warn Hubs, Int'l Up-Pipes, RR IC-Boots, Non-Ebpv Pedestal, High Flow Outlet, Hucorey's HPOP Lines, RR High Flow Fuel Fittings, RR OCR, Barder 360 Thrust Kit, 08 Tow Mirrors.

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post #10 of 11 Old 09-03-2013, 06:27 PM Thread Starter
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They said the fan clutch is stuck on which explains the noise and as for leaking up pipes, is that a matter of tightening connections or something more serious?
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screech , troubleshoot , turbo 7.3 powerstoke

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