Intermittent noise like a dry bearing spinning - Ford Powerstroke Diesel Forum
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Old 09-26-2012, 07:15 PM
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Intermittent noise like a dry bearing spinning

99.5 with 350,000 miles. Noise coming under the hood while driving like a bearing is spinning that's dry and vibrating. Changed all the pulleys and bearings on the belt and the ps works fine but has a light growl when turning the wheel. The noise is off and on but applying the throttle and brake doesn't change when it occurs or stops. Could the hydroboost make this noise? TIA
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Old 10-02-2012, 05:56 AM
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Changed out the hydroboost (leaking anyway) and ps pump. Noise is still there. You can feel it in your feet/firewall and the steering wheel. Any ideas?
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Old 10-02-2012, 07:26 AM
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If you can feel it in your feet it has to be something bigger than a pulley or power steering pump. Possibly a tranny issue, is it an auto or a stick?
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Old 10-02-2012, 09:44 AM
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Auto. I had thought about the tranny as well as it sounds like something caveating almost. Thing is the tranny feels fine and there is no slip or surge while driving.
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Old 10-02-2012, 11:04 AM
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I wonder if something like the torque converter could be out of balance somehow , but still work fine.
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Old 10-04-2012, 01:46 PM
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Driving us crazy. Noise stopped for a day and we thought it was gone. Now back and worse. The noise usually starts when cruising in town around 1200-1500RPM. I popped it out of OD (auto) and it kept a constant sound and never really changes pitch. Only once or twice when coming to a stop light did the noise keep going all the way to idle then stopped right at idle. Sometimes a bump in the road will cause it to make a quick little hum but thats it. Other times it will go on for 10-60 seconds and then stop and start right back up. Then get going again and it wont make a sound for quite a while. Here is a vid of the noise right at the start and then it stops and goes again. As said I've replaced all tensioner pullies and idler, p.s. pump and hydroboost. You can feel the small vibration during the noise in the steering wheel and the floorboard. Thanks for any ideas.

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Old 10-04-2012, 02:13 PM
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I think it is time to check your wheel bearings... I don't know what else it could be
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Old 10-04-2012, 02:55 PM
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Its definitely up in the engine compartment. I wish it was just wheel bearings. Thanks though!
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Old 10-04-2012, 03:11 PM
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So, does it ever make the noise/vibration when not moving? 'Cause I'm gonna agree with CC above ^.

First thing I would do is to lock the ft hubs IN (don't need to be in 4WD) to eliminate the needle brgs in the ft hubs from spinning and see if that goes away
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Old 10-04-2012, 03:20 PM
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It does not........ I'm swearing its up higher but I'll def go try it right now and let you guys know. Crow in pocket if thats it.
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