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Old 01-26-2010, 01:17 PM   #26
psychoskip
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Quote:
Originally Posted by WRX8XB View Post
Once I'm sure the hoses I have are the right ones I'll post up part #'s for everything I have.
Im sure if you call your local subaru dealership they can locate them.
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Old 01-26-2010, 02:30 PM   #27
danimal5737
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Default Air in Power Steering Pump

I did a new timing belt on a 2004 STi and when all was back together, had the dreaded pump noise. I found the two solutions, although at different times. I would like a part number for the O ring if possible. Local Subaru dealer does not show a number, but it is on the picture. An O ring from another pump line area might work. My O ring was actual flat rather than full O ring, and looked designed that way. I put a thin film of Gaskacinch until i can find a replacement.
Also I sucked out the fluid and replaced with Mobil 1 ATF. Noise for two days. This morning I flushed again with Vavoline High Mileage ATF, and noise and jerky steering was gone by the time i got to work. I will also build a vacuum port for the container this weekend. Just in case...
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Old 01-26-2010, 02:33 PM   #28
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Quote:
Originally Posted by psychoskip View Post
Im sure if you call your local subaru dealership they can locate them.
I already have them, and they "should" be the right ones. I haven't installed them yet so I can't say for certain. Once I know for certain I'll post them up.
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Old 01-26-2010, 09:52 PM   #29
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My old O ring was taller than thick and did not exactly have a round cross section either. An exact replacement isn't necessary. What you want it one that will compress and seal when clamped in the spot it is designed for. Mine is still fine. I bought a couple of different sizes from memory and then used the one that was closest.

BTW... I noticed that all my vacuum lines had hardened and most were not tight. Zip ties won't bring em down either they are so hard. I will be buying a few feet of appropriate lines to cut to fit and install. My dealer didn't have the stock O rings and didn't sell rebuild kits due to liability issues I was told. Hwy61
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Old 01-29-2010, 07:20 PM   #30
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where can you pick up those o-rings..? cause i went by the dealership and they couldnt find a part number for the o-ring..
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Old 01-29-2010, 10:21 PM   #31
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Originally Posted by c0rehax View Post
where can you pick up those o-rings..? cause i went by the dealership and they couldnt find a part number for the o-ring..
NAPA, Auto Zone, Lowes, etc. Hwy61
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Old 01-29-2010, 11:03 PM   #32
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preliminary testing is positive. Going to get a chance to simulate an autox at a drift session (basically a few guys rent a runway/skidpad and practice).

Will know tomorrow if the new hoses, clamps, o-ring did the trick. I sure hope so.
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Old 02-10-2010, 01:32 PM   #33
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Thanks hwy61!!! I was able to repair my steering problem for a $1.00 O-ring and a $1.00 hose clamp.

The serch button proves to be valuable again!
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Old 02-14-2010, 09:37 AM   #34
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Thanks for the detailed write up on this.

I have an '05 Saab 92x Aero with a recently discovered whining noise up front. It looks like the PS resevoir is down a bit in fluid (about a 1/4 inch below the 'cold min' mark when cold). I have driven approx. 150miles since I first began to notice. I have a couple quick questions for you folks here with more experience than I:

1) I obviously don't want to drive any further with the fluid low/down like it is, but about how far would one have to drive before the pump is toast? I'm just trying to assess how much damage I may have done so far, if any.

2) Any idea if the pump on the 92x Aero is the same as the STi? I know the rack is the same, but I haven't seen anything definitive regarding the pump. Or, for that matter, is the STi pump the same as the WRX pump? I'm figuring (hoping!) I may have the dried out O-ring situation mentioned here and not something more drastic.

I'm up in the Northeast and we had a few days down in the teens recently. On one particularly cold day the thing was screaming pretty good on start-up. It was the first time I really noticed something wasn't right. As someone mentioned above, the cold weather seems to be bringing these issues to light.

Thank you all for any input you can provide.
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Old 02-14-2010, 12:03 PM   #35
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Cold temp make rubber harden and shrink. On one hand you might think this would make your hoses clamp down harder but that isn't how it shrinks. It shrinks in the dimension of how thick the rubber is, not by pulling the diameter of the opening down. In fact the inner diameter increases which is why a check of your clamps in cold weather will generally show that they can stand additional tightening. The same shrinkage occurs with O rings.

First check for air in the reservoir by starting the engine and look for bubbles. The reservoir is simply a container used for easily filling the system with fluid. If the fluid is a little high or low it is of no significance. What you want is enough fluid in the reservoir so that the supply line is completely covered at all times, including sharp cornering. That way air can't be sucking into the system. Air stops everything quickly. The fluid in addition to acting as a hydraulic fluid also is a lubricant so changing it occasionally is important.

I have no idea about fitment of the various pumps. Hwy61
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Old 02-15-2010, 04:48 PM   #36
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I spent a little time researching this some more and found out that, for me, it was the idler pulley causing all that noise. There are a couple of good threads out there with detailed info:

http://forums.nasioc.com/forums/show....php?t=1487622

http://forums.nasioc.com/forums/show...t=idler+pulley

Autozone doesn't seem to think that the 92x and WRX parts crossover all that much but they absolutely do. I picked up the following parts from Autozone (all prices in NH) to do the repairs today:

Idler Pulley:
Duralast (metal) Part # 231029 $41.99

Belts:
Alt & PS (Goodyear/Gator) Part # 4050345 $16.99
A/C (Duralast) Part # 350K4 $17.99


Pretty quick and easy fix all around. I had to remove the tensioner bolt from the Alternator completely to stretch the belt over but beyond that it was a snap.

It runs and sounds like a champ again without having to spend $100's on a new PS pump!
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Old 02-25-2010, 10:57 PM   #37
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ive been having this problem with jerky steering and moaning and groaning when turning on cool/cold days.


thanks to this thread, with a .02 cent o-ring, i was able to fix my problem.



thank you guys very much for the information in this thread.
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Old 04-29-2010, 08:31 AM   #38
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i was doing some work on my engine and had not started my car in about a MONTH!
after all the work was done and the car placed back onto the floor.
The car was started and left to idle for around 15 minutes, mind you once the engine was started there was an AUdible whining noise coming from somewhere!
Then i tried to turn the steering , everytime i turned it the whining got louder, and then to my horror when i went back towards the engine bay, there was power steerign fluid bubbling OUT of the reservoir.
Now my level was a bit higher than normal, but i tried all the bleeding procedures and i checked my hoses and appeared to be in good condition.
One the PS fluid stopped flowing out of the reservoir i drove the car, the steerign was very jerky and at time when i mashed the brakes it was extremely hard to turn!
I once again jacked the car up and bled the system of air.
Steering is still jerky at times and still harder sometimes when applying hard brakes.

I dont know what to do!
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Old 04-29-2010, 09:16 AM   #39
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Quote:
Originally Posted by triniscoob View Post
i was doing some work on my engine and had not started my car in about a MONTH!
after all the work was done and the car placed back onto the floor.
The car was started and left to idle for around 15 minutes, mind you once the engine was started there was an AUdible whining noise coming from somewhere!
Then i tried to turn the steering , everytime i turned it the whining got louder, and then to my horror when i went back towards the engine bay, there was power steerign fluid bubbling OUT of the reservoir.
Now my level was a bit higher than normal, but i tried all the bleeding procedures and i checked my hoses and appeared to be in good condition.
One the PS fluid stopped flowing out of the reservoir i drove the car, the steerign was very jerky and at time when i mashed the brakes it was extremely hard to turn!
I once again jacked the car up and bled the system of air.
Steering is still jerky at times and still harder sometimes when applying hard brakes.

I dont know what to do!
It's definitely the pump, just a matter of figuring it out.

Try switching the fluid to the ATM fluid, then bleeding it. While you're at it, like many have suggested, switch the clamps all around. If that doesn't work, you might need to think about getting another pump.
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Old 04-29-2010, 09:23 AM   #40
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^^^thanks

i just went and tightened the belt and it seemed to have helped a bit, but still getting a light WHINE noise, i guess over the next few days i will see if it gets Jerky again!
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Old 04-29-2010, 09:25 AM   #41
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Quote:
Originally Posted by triniscoob View Post
^^^thanks

i just went and tightened the belt and it seemed to have helped a bit, but still getting a light WHINE noise, i guess over the next few days i will see if it gets Jerky again!

Could be the belt. Considering you didn't start the car for a month, could have something to do with it.
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Old 04-29-2010, 01:21 PM   #42
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Quote:
Originally Posted by triniscoob View Post
^^^thanks

i just went and tightened the belt and it seemed to have helped a bit, but still getting a light WHINE noise, i guess over the next few days i will see if it gets Jerky again!
did you change the o-ring in the inlet to the pump?

also if you took the stock clamps off the hose you really should either use worm clamps. If the stock hoses are hard it's not a bad idea to replace them.
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Old 05-03-2010, 10:18 AM   #43
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does Subaru sell the o-ring, or the hose end connected to the o-ring separate from the pump? I need to replace these items, and i dont see them listed separately in the parts diagram.
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Old 05-03-2010, 01:27 PM   #44
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They do not, all you need is to take the stock one somewhere that sells o-rings and find one that is the same size.

I've got a few spares laying around that I'll try and take measurements on (once I get batteries for the digitial calipers).
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Old 05-16-2010, 01:50 PM   #45
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I was just wondering what the size of the o-ring is... thanks!
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Old 05-17-2010, 03:23 PM   #46
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Great thread, I have similar symptoms and am going to try to re-place the O-Ring this weekend. I looked up that O-Ring in some of the suppliers I use here at work for O-Rings and thought I'd add the info to the thread.

McMaster-Carr: 9262K234 www.mcmaster.com
O Rings West: P/N: M2.5X11 www.oringswest.com

When I get the O-Ring out I have some measurement tools here at work I can use to double check this is the closest standard O-ring size.

Thanks for the detailed write up.
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Old 05-20-2010, 11:12 PM   #47
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Quote:
Originally Posted by danimal5737 View Post
I did a new timing belt on a 2004 STi and when all was back together, had the dreaded pump noise.
I had the exact same thing happen to me!!! I replaced the clamps; still had PS pump noise. Just replaced the O-ring and the noise is finally gone! Still a few rough spots on the rack once in a while... Just gotta bleed it more I suppose. Got the O-ring out of one of those O-ring variety packs at Kragen (SAE size actualy, the metric kit didn't have 11mm ID)
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Old 06-03-2010, 07:52 PM   #48
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So, I followed everything in this thread and I still have no power steering. New o-ring, replaced the belts, flushed the pump/resevoir and still have bubbles in the tank. No visible leaks around the rack or any of the attached hard lines.

Thinking I need a new pump. Amarite? Any other suggestions before I go replacing the entire thing?

P.S. BIG thanks to hwy61 and williaty for all the info in this thread.
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Old 06-06-2010, 11:51 AM   #49
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Having the same problem after i had some stuff done on my car.

going to try the flushing/o ring replacement.

subscribed.
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Old 06-06-2010, 09:24 PM   #50
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Also, can anyone confirm what pump years/models are interchangeable? Anyone have a part number for the pump itself?

Edit: Nevermind. Looks like '04+ all have the same pump per this thread... http://forums.nasioc.com/forums/show...mp+part+number
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