whats actually going wrong inside my power steering pump to make it whine - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-03-2011, 10:57 AM
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whats actually going wrong inside my power steering pump to make it whine

i've had a 98 4runner for a couple of years, and the power steering pump whines more often than not
(i think it just gets louder and quieter, but is always making some noise)

whats making the whining sound inside the pump?

i found out that these systems use dextron II for fluid

if some one put the wrong oil in it, would it cause this sound?

if so, would changing the oil to the correct type fix this, or is the damage done?

or is it something else is just worn out and oil type has nothing to do with it?

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Old 05-03-2011, 12:16 PM
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As far as i knew if it was low on fluid it will whine. i wouldn't think using a different kind of fluid would ruin it. maybe if the 2 were mixed?? does it whine all the time or just when you turn the wheel all the way to one side or the other?
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Old 05-03-2011, 12:43 PM
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Hi
Power steering pump whine is normally caused by air in the system or low fluid level(witch lets air into the system), contaminated or worn-out fluid (dirty/thin), air can be introduced through internal leaks in the rack, or small leaks elsewhere in the system.
Rich
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Old 05-03-2011, 01:25 PM
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I guess, I will try and change the fluid and see what happens, I've got nothing to lose at this point.
plus it will help flush out the system, if i end up changing the pump.
who knows what the owner before me put in there
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Old 05-03-2011, 04:11 PM
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Quote:
Originally Posted by matts37chev
I guess, I will try and change the fluid and see what happens, I've got nothing to lose at this point.
plus it will help flush out the system, if i end up changing the pump.
who knows what the owner before me put in there
Bad bearings in the pump will also make it whine. The wrong fluid can and will ruin the pump and the rack. The rack can also make the pump whine if it restricts the flow to much.

make sure it is the pump, a bad idler or tensioner sounds exactly the same.
The long screwdriver test can help pin it down. I just did a Cadillac that sounded exactly like pump whine, it was the idler.
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