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Old 12-06-2009, 11:45 AM
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Strange Vibration

I have a 97 F-250 4x4 7.3L Auto. I recently noticed a new vibration in the engine with the RPM between 1950-2100. Above 2100, the vibration dissapears. Its a fine vibration that is present anytime the engine is between those RPMs; In park, Neutral or shifting up. I don't hear any squeaks or grinding when the vibration is present, or when its at idle with the hood up. I had one sticky idler pulley bearing thats been replaced.

I'm looking for any suggestions.

Thanks,

Casey
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Old 12-06-2009, 01:03 PM
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pull the belt off and see if it still vibrates.
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Old 12-06-2009, 10:09 PM
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I pulled the belt off and noticed a definite decrease in the noise and less vibration. With the belt off, when i spin the fan blade, I hear a distinct medium pitch groan coming from the water pump. If I push/pull on an edge of the fan blade there is noticible play in the pump. Im guessing these are not normal and should replace the water pump. Thoughts?
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Old 12-07-2009, 03:10 AM
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sounds like you got a winner
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Old 12-08-2009, 11:59 PM
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Well, after all that (changing the water pump), the vibration decreased, but is still there. The PS pump seems to turn smoothly but has a decent amount of resistance. The PS pump has about 3/16 play in and out, but no play up and down. Think it needs to go also?
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Old 12-09-2009, 09:14 AM
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nope that's normal to have that kind of play.
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Old 12-12-2009, 09:22 PM
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The alternator doesn't have any play up/down, in/out but squeaks a bit when I turn it by hand. The only things left are the balancer and the vacuum? pump near the PS pump. Any recommendations? I realize this vibration probably isn't a huge deal, but its driving me nuts. Thanks for the info so far!
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Old 12-13-2009, 08:38 AM
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is the vibration totally gone when the belt is off?
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Old 12-13-2009, 04:23 PM
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The vibration is definetly present with the belt on or off. I noticed today that the RPM range is increasing and I feel a series of different vibrations on the floor under the brake pedal as the RPM increases/decreases. I'm going to crawl under there and see if something is loose and touching the floor or frame or if a mount is broken.

Last edited by caseyj512; 12-13-2009 at 08:30 PM.
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Old 12-13-2009, 08:34 PM
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I wasn't able to see anything rubbing on the cab or frame, and the mounts don't have any obvious fractures.

When I run the engine up in neutral to 2000 rpm, the rpm will drop by 300-400 without any change in throttle position on my part. I have to depress the throttle again to get the rpm back up to 2000. I got the same drop when trying 1500 rpm and 2500 rpm.

I changed the fuel filter recently BTW.
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