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PS Steering Pump Whines After Hi-ratio Upgrade


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THE PROBLEM:

The PS steering pump began whining after upgrading to the 12:1 higher ratio gearbox from powersteering.com
We decided the pump was probably original and needed rebuilt, so we sent it off to powersteering.com too.

We just installed the rebuilt Pump, bled it while jacked up and engine off (stop-to-stop about 10x) then again with engine running. Topped off the reservoir, and it is still whining. No difference from rebuild. 

ADDITIONAL INFO: 

The gearbox was rebuilt as part of a complete front suspension replacement. All new Moog front suspension. Might try some PS fluid additive.

Any ideas, folks?

Could the new gearbox ratio be stressing the stock power steering system?

Would upgrading/converting to a later-model pump give it the power it needs? Any help would be greatly appreciated.

Thanks,

JB

 

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4 hours ago, airfido said:

Could the new gearbox ratio be stressing the stock power steering system?

No.  Quick ratio, standard ratio or variable ratio they all use the same volume of fluid to move the steering from lock to lock.  They put no more or less strain on any component.

 

4 hours ago, airfido said:

Would upgrading/converting to a later-model pump give it the power it needs? Any help would be greatly appreciated.

 

I don't understand the question.  This is the first place you mention anything about power.  About the only positive thing you gain out of a pump swap is the possibility of choosing something that weights a little less, and offers easier pressure adjustability.

 

What kind of fluid are you running pre and post box swap?

 

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Are you using Type F ATF? Had several that were noisy because of incorrect fluid. Since you have no change after having the pump rebuilt, it probably also has air in the system, which may take time and some driving to get it all out. 

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Any opinions on best additives to cure this problem?

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Will see how it progresses with some miles on it.

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My bet is also just some air in the system, it took me a while of bleeding it with the wheels off the ground going lock to lock with the engine off. But mine has been good after changing the box to a red head quick ratio box. 

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  • 4 weeks later...

Update: After driving it a few times, the whine is quieter, but still there.  Talked to Powersteering.com and they were also perplexed, but recommended a thickening additive for the Type F fluid.  I have not done that, and feel like I shouldn't have to.  The entire front suspension, steering gearbox and pump are either new or rebuilt by powersteering.com. Maybe it will slowly quiet down. We'll see. 

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9 hours ago, airfido said:

Update: After driving it a few times, the whine is quieter, but still there.  Talked to Powersteering.com and they were also perplexed, but recommended a thickening additive for the Type F fluid.  I have not done that, and feel like I shouldn't have to.  The entire front suspension, steering gearbox and pump are either new or rebuilt by powersteering.com. Maybe it will slowly quiet down. We'll see. 

WTF!  Thickening additive?? There was recently another member if I remember, who also had issues with a PS box from powersteering .com.  makes one wonder how good they really are.  Personally, I have built 2 variable ratio boxes for my own use and that was after a so called professional  did such a bad job on one, I decided it was time to learn how. I have never had any whine or any other noises other than just air as it bleeds out. 

Somethin ain't right there.

EDIT: OK, so now I feel like  a twit, you were referring to the PUMP, not the PS box. My bad for misreading. None the less, thickening additive, Why?

Edited by Stanglover

Geoff.

 I learn something new every day!

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Agreed that the quick turn upgrade will have zero effect on the pump or the noise..

With my car I had Powersteering.com do the box and I got a replacement pump from Rock Auto due to intermittent power.

To stop the noise in our system I suspended the front wheels, with the car off and went stop to stop about 20 times with a full reservoir.  This was different than the bleed instructions from Powersteering.com and from Dorman/ Rock auto.  Mine does well now.  I did call Marty at PS.com and agreed that this was the way to go for the Mustang.

I hope that helps.

kcmash

 

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