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Category: Car
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Experience:  33 years exp. automotive repair NYS emisisions repair cert.
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2000 ford: 5.4 superduty with air..loud..bearing..cab

Customer Question

2000 ford box truck 5.4 superduty with air. At high rpm there is a very loud screaming or bearing noise down near pasangers feet or floor in cab, no noise outside and noise is gone when serpintine belt is off. Have new bearings on altinator,new tensioner,new belt,new idler pully. air compressor sounds good withn stethiscope and power steering seems ok? I have heard of y pip problems but its awfull loud for that? With clutch fan off its still there? I dont think its the water pump?
Submitted: 11 years ago.
Category: Car
Expert:  Marc replied 11 years ago.
 

What size super duty?  F250  F350  F450?
Customer: replied 11 years ago.
Reply to enginboy's Post: F350
Expert:  Marc replied 11 years ago.
  What are you saying: you took the clutch fan off and left the belt on and it syill makes the noise. But the noise goes away when you take the belt off. RIGHT?  

AND YOU DON"T HEAR THE NOISE OUTSIDE THE TRUCK?
Customer: replied 11 years ago.
Reply to enginboy's Post: Correct
Expert:  Marc replied 11 years ago.
 

I don't know,been thru the TSB's and it really dos'nt ring any bells to me. Maybe one of the other techs might have something to offer. Or take it to someone to listen first hand .Not being able to hear it puts us at a disadvantage.
Expert:  Davo replied 11 years ago.
You could try it with the a/c on and see if it gets better or try rotating all the pulleys by hand feeling for roughness.If you can get the stethoscope on the a/c maybe he needs to poke it around some more.I've had water pumps make a squeal like a bad alternator.Some noises can be covered up by normal engine noise when outside of the vehicle.Also try removing the vacuum hose from the fuel pressure regulator and plugging it they have been known to make whining noises.
Customer: replied 11 years ago.
Does it with air on or off and no noise with stethoscope to compressor. Will try removing vac hose as soon as I get time and get back to you.
Customer: replied 11 years ago.
The noise is there when moving or not. Outside you cant here it inside its like a loud bearing noise / screaming noise?
Expert:  Marc replied 11 years ago.
  Dose the noise change when you rev the engine?  or at certain engine speeds ?

 
Customer: replied 11 years ago.
Only at high rpm

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