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Which part specifically causes a power steering pump whine? #5453213 06/13/20 09:01 PM
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Twisted1 Offline OP
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I’ve always wondered, but never found out which part exactly in a power steering pump assembly causes the pump to whine. I’m a Ford owner so they whine regardless..


01 Mustang GT Conv. - JLT CAI - SLP LM1 Mufflers - Catted X-Pipe - 4.10's - Steeda UD Pulleys - BAMA 91 tune - Steeda Tri-Ax SS - Eibach Pro-Kit - Koni STRs - Saleen 18's - 265-35-18 F - 315-30-18 R
Re: Which part specifically causes a power steering pump whine? [Re: Twisted1] #5453222 06/13/20 09:13 PM
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JimPghPA Offline
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You do know that they whine because they are low on fluid, don't you?

I think it because of air getting into the actual pump section that has the centrifugal veins and compressing air.


Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: Which part specifically causes a power steering pump whine? [Re: JimPghPA] #5453224 06/13/20 09:21 PM
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Twisted1 Offline OP
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Not always. I replaced my PS pump with an AC Delco unit and it whined from the beginning.


01 Mustang GT Conv. - JLT CAI - SLP LM1 Mufflers - Catted X-Pipe - 4.10's - Steeda UD Pulleys - BAMA 91 tune - Steeda Tri-Ax SS - Eibach Pro-Kit - Koni STRs - Saleen 18's - 265-35-18 F - 315-30-18 R
Re: Which part specifically causes a power steering pump whine? [Re: JimPghPA] #5453238 06/13/20 09:35 PM
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Miller88 Online Content
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Originally Posted by JimPghPA
You do know that they whine because they are low on fluid, don't you?

I think it because of air getting into the actual pump section that has the centrifugal veins and compressing air.


I think every 90s Ford left the dealer lot brand new both full of PS Fluid and whining.


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Re: Which part specifically causes a power steering pump whine? [Re: Miller88] #5453312 06/13/20 11:13 PM
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Twisted1 Offline OP
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Exactly. I’m just wondering which part internally causes that whining


01 Mustang GT Conv. - JLT CAI - SLP LM1 Mufflers - Catted X-Pipe - 4.10's - Steeda UD Pulleys - BAMA 91 tune - Steeda Tri-Ax SS - Eibach Pro-Kit - Koni STRs - Saleen 18's - 265-35-18 F - 315-30-18 R
Re: Which part specifically causes a power steering pump whine? [Re: Twisted1] #5453461 06/14/20 07:09 AM
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BigCahuna Offline
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A dry bearing.,,,

Re: Which part specifically causes a power steering pump whine? [Re: Twisted1] #5453504 06/14/20 07:56 AM
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Ded Mazai Offline
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The housing. When it wears it loses the original smooth shape.


BRZ | M1 HM 5W-20, FU | PZ Synchromesh.
Re: Which part specifically causes a power steering pump whine? [Re: Twisted1] #5453574 06/14/20 09:16 AM
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sloinker Offline
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I imagine it's the shaft riding against the front bushing/bearing being pulled by belt tension.

Re: Which part specifically causes a power steering pump whine? [Re: Twisted1] #5453610 06/14/20 09:57 AM
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samven Offline
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I am still trying to figure out why some hydraulic pumps whine and others dont. The best I have come up with is fluid weight. I notice more whine in cold temps and have found some manufactures of pumps spec thinner fluid in the winter or have moved to multigrade synthetic fluids. Weather this translates to power steering fluid or not I dont know.

Re: Which part specifically causes a power steering pump whine? [Re: Twisted1] #5453613 06/14/20 09:59 AM
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Ded Mazai Offline
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Tried to find a video explaining why the pump starts to whine. Couldn't find anything in English. There is one in Russian.

https://youtu.be/8k9rQmbC8aQ?t=706

The guy shows with his finger the place where the wear takes place.


BRZ | M1 HM 5W-20, FU | PZ Synchromesh.
Re: Which part specifically causes a power steering pump whine? [Re: Twisted1] #5453888 06/14/20 05:09 PM
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Twisted1 Offline OP
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Thanks a bunch fellas!


01 Mustang GT Conv. - JLT CAI - SLP LM1 Mufflers - Catted X-Pipe - 4.10's - Steeda UD Pulleys - BAMA 91 tune - Steeda Tri-Ax SS - Eibach Pro-Kit - Koni STRs - Saleen 18's - 265-35-18 F - 315-30-18 R
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