Where is this noise coming from!! (With vid) - Ford Powerstroke Diesel Forum
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Old 04-13-2013, 07:57 PM
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Where is this noise coming from!! (With vid)

Well I had my vacuum pump replaced about a month ago then it seized up and smoked the belt. So I took it back to the shop that had fixed it and the replaced it and the belt. But as soon as I left the shop the belt started squealing really as soon as you got on the gas, so I thought it was because it was a new belt so I drove for a few days and it was still doing it so I took it back and they said they couldn't hear it! Of coarse!! Well I thought it was the vacuum pump pulley cause it rubber on it so I cleaned it and the noise changed. Now it doesn't ring until it warms up and it only does it around 2000 rpms under load. Well hears the vid hope you guys could help me figure it out!!!
http://m.youtube.com/#/watch?feature...e_gdata_player


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Old 04-17-2013, 11:05 AM
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First, check the front of the motor where the Vac. Pump pulley is. Looking to make sure that the pulley is seated onto the shaft to the right depth (see if the pulley and belt are in line with the A/C and crank pulleys). Undo the belt from the alternator and check for play or a rough rotation. _Might_ have glazed a bearing. Do the same for the tensioner.
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Old 04-18-2013, 06:52 PM
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Well I checked all the pulleys and they were smooth. The alternator had just a little play and made some noise when I spun it but it didn't sound bad. Also the steering pump look like it wasn't perfectly aligned? Would that cause it? And it only does it when you pull a trailer or get it hot.


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Old 04-18-2013, 06:57 PM
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Shut the truck off and grab your cooling fan and see if you can spin it. I had one not too long ago where the bearing went out and locked up. If you can't rotate the fan fairly easily, the clutch is junk. I could grab the fan and spin the pulley with the belt tight.
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