Air pump pulley question - Ford Powerstroke Diesel Forum
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Old 11-15-2012, 11:18 AM
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Air pump pulley question

Should this pulley feel like it has a some tension in one spot but nothing on the other, like its oblonged in a spot, I'm assuming its to do with the pump, just concerned!
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Old 11-15-2012, 01:15 PM
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Take the belt loose and grab the pulley to see if the bearing is going out. It should ride pretty flat on the belt.
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Old 11-15-2012, 02:46 PM
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It does feel tight but when u spin it,its not like a regular idler, i'm assuming it has to do with the pump but i'm not a 100%, just wonder if it should spin like a regular idler. Or is it messed up but it doesn't have any play back and forth. Just wondering if it need to be replaced



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Originally Posted by BigFuel View Post
Take the belt loose and grab the pulley to see if the bearing is going out. It should ride pretty flat on the belt.
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Old 11-15-2012, 03:06 PM
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Naw, it has a "lope-y" rotation. The insides are like a inline two cylinder piston pump. This is what builds the vacuum pressure.
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