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#1
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Air in the power steering fluid?
I had a post a few days ago, about a low noise, typically on the first start of the day when backing straight out of my driveway. When I turn the wheel a bit, there will be a low huuuuuuuh kind of a sound. It might do it one more time, then is pretty much ok all day, might do it once during the day after a warm start.
Someone wrote to my other post, that it could be air in the power steering pump, to jack it up, turn the wheels all the way left and right a few times to get the air out. I don't know how air could get it, seems like it'd bubble right to the top of the fluid. Not to disbelieve who wrote that, but he was the only one who replied back. Was just trying to see if anyone else concurred or had any ideas. My neighbor said maybe the PS pump is starting to go. Thanks, Jeff 1991 300d, 103k |
#2
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Never experienced that, flushed my PS pump twice, letting it get completely dry, seems to me at the volume that thing pumps, no air coould stay in it or the lines once its filled up with fluid.
__________________
Ich liebe meine Autos! 1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete 1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday... 1981 Mercedes-Benz 300SD | Rear ended, retired in garage. 2009 Yamaha AR230HO | Das Boot Excessive speeding? It ain't excessive till I redline! |
#3
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Air can't stay in the lines, but it could stay in the box. It definitely will stay in the rack of a newer car, and circulate with the fluid as tiny bubbles. I had that problem with mine.
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#4
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The only time I had noise coming from my PS system, it was due to low PS fluid levels in the system.
Once I added a little more to the reservoir, it quit making the noise. I'm assuming that it blew all the bubbles back up to the reservoir, but I can't swear to that.
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-Josh Testing the cheap Mercedes axiom, one bolt at a time... |
#5
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Just make sure that the reservoir is filled and then turn the steering wheel back and forth with the engine running. After turning back and forth for about 5 or 10 turns. Kill the engine and make sure the reservoir is full. It will show some bubbles at that point, but just see that the res is full and drive it. There is no need to jack up the front.
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#6
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Bad for the tires
Quote:
Thanks, jeff |
#7
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Quote:
__________________
RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
#8
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Yes and make sure that you sweep the shop floor first so that the tires don't get dirty.
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#9
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__________________
1985 CA 300D Turbo , 213K mi |
#10
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The system is effectively self bleeding, If the fluid is @ the correct level, there should be little to no foam in the reservoir after a day of driving, Perhaps your fluid is compromised (water or some other substance), Power steering fluid shoud be clear, if its not, flush it. They usually hum when they are low on fluid.
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Cheers, Robert |
#11
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A clogged filter will also rob the pump of oil, resulting in humming, and eventual failure.
__________________
RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
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