Turbo whine? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 10 (permalink) Old 04-01-2017, 11:46 PM Thread Starter
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Turbo whine?

I have a 01 f-250 7.3L, bought used. I just had the transmission replaced this week. They also replaced the rear main seal while it was out because we thought there was a leak coming from it. Rewind back to before the new trans, the truck started making a funny whine at throttle. The turbo was also (maybe?) surging and whirring. The whine is more like a fire truck siren. It winds up with throttle, holds steady with the throttle held and whines down when you let off. Ive been given a few suggestions:
1) the turbo wheel has play. I took the intake hose off this afternoon and it does not have any play. The hose did have some oil in it. Is this normal?
2) the boots or pedestal seal needs need replacing. I checked the valley. I removed about a half a ton of debris from the valley but it was soaked in oil.
3) the whole turbo is shot. How do I know, short of just replacing it?
4) the power steering pump. This noise is present while in park and giving it throttle. Would the pump still make this noise without doing anything but revenge the engine? And would it get louder and softer? It seems to me that noise would only come when moving the wheel and be a steady noise.

I'm fine taking the turbo off and replacing the boots and seals. I might even be ok venturing into rebuilding the turbo with an upgraded wheel myself. Before I go to those lengths I thought I'd get some opinions here. I'm trying to get YouTube to upload the video I got with in cab and out of cab sounds but it isn't currently cooperating. Thanks for any help.
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post #2 of 10 (permalink) Old 04-02-2017, 12:04 AM
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Re: Turbo whine?

Power steering pumps depending on how broken they are they can be the cause of a type of whine or whirring that surges with throttle even without turning the wheels, and it can be very loud, especially the ford pumps. But if you turn the wheels and the noise gets gnarly, its the pump.
As for the turbo, thats out of my knowledge range right now so someone else will have to chime in on it.

Get that YouTube video up and people here can probably identify the sound if its audible.
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post #3 of 10 (permalink) Old 04-02-2017, 01:17 AM Thread Starter
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Re: Turbo whine?

It won't let me post links

In cabin

Out of cabin
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post #4 of 10 (permalink) Old 04-02-2017, 01:48 AM
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Re: Turbo whine?

Definitely not power steering. Id think its a turbo thing as it sounds like it loses input force and winds down when you let off the throttle. But I'm no turbo expert by any means, I am new to diesels but not to most other stuff.
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post #5 of 10 (permalink) Old 04-02-2017, 02:16 AM
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Re: Turbo whine?

Any chance the noise started with the aftermarket air filter?
Also tie open the ebpv and look for exhaust leaks.
Far as it being the power steering pump, you can remove the belt and run the engine see if it goes away.

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post #6 of 10 (permalink) Old 04-02-2017, 06:37 AM
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Re: Turbo whine?

ford power steering pumps, especially those of the 7.3 and earlier, are very loud when improperly working. They sound like a supercharger and that is no understatement. If it was a power steering problem that video would have made it obvious for all of us if not me at least as I have heard and worked on quite a few power steering problem ridden trucks in the past. removing the belt would have been my next piece of advice if that whining noise was even remotely close to a power steering sound. I'd say, take the turbo off and check all the clearances and seals. if anything is remotely bad remove it and rebuild the turbo. Intake whining sounds just like the turbo, but only really at high boost/rpm. Your sound started as soon as you hit the throttle and sounded like it had inertia to it, E.G. it took a second to go away after the truck returned to idle from an rpm spike.
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post #7 of 10 (permalink) Old 04-02-2017, 11:53 AM
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Re: Turbo whine?

Have you checked all of your boots? Make sure they are tight and not starting to crack. Also, I assume you haven't rerouted the ccv. That would explain why you have oil in your intake and that may be causing one of your boots to come loose.

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post #8 of 10 (permalink) Old 04-02-2017, 12:57 PM
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Re: Turbo whine?

i would say check the boots first.
i can not watch the videos, they are some kind of vimeco thing that youtube does not recognize.

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post #9 of 10 (permalink) Old 04-03-2017, 01:20 AM Thread Starter
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Re: Turbo whine?

I took the belt off today and the whine did not go away. There is a noise difference since adding the giant air filter but that was added a year ago. I love that added noise. I didn't want to play grease monkey on my birthday so I'll check the boots tomorrow if I make it home before dark.
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post #10 of 10 (permalink) Old 04-03-2017, 01:28 AM
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Re: Turbo whine?

I would check the boots from the video you shot it sounds like a boost leak so defiantly check the boots.

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