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Old 01-02-2014, 08:17 AM   #176
Dezertrat
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Been lurking for a while looking for help do to a lemon I should not have purchased. I've replaced the starter, crankshaft and camshaft sensor, radiator and just a few days ago the top radiator hose ( when I replaced the radiator I didn't install the hose right and it rubbed against the alternator pulley and put a hole in it) all sense sept. Now to the current issue, after I changed the radiator hose, I started the car up to warm it up to see if it leaked anywhere. All is good. Load the buddies up to head to Vegas for New Years. Backing out of the parking spot as soon as I go to turn the wheel I can hear the steering pump groan and my steering started stuttering. Instant anger. Just got back from Vegas and started lurking and found this gem. The whole trip I thought I was gunna have to drop 400$ on a new pump so my fun was pretty much non existent. Going to check for bubbles and change the o-ring out tomorrow. Car has 137,000 miles, my thinking is when I had issues with the radiator and hose and it being winter and a old o-ring, when I dropped the coolant both times the car got pretty warm and the mixture of hot then cold and old age finally did in the o-ring. Does this sound right? The fact that it happend overnight is what's throwing me through a loop. Thanks for the help guys!
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Old 01-02-2014, 01:39 PM   #177
brianglawson
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Im going through this too... SUPER CLEAN 103k miles 2004 Sti, well maintained, clean engine bay, etc....

Did my timing belt this week, the ONLY thing I disconnected was the inlet hose... after the timing job, I reconnected and started the car to bleed the system.... 24hours later... im stumped....

never, EVER had a problem before..... I have tried Everything, except finally diving in and replacing that oring
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Old 01-02-2014, 01:46 PM   #178
Surf WRaX
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The think for me it was the copper washer on the pressure side of the pump, it has been a few years but I think that is the washer that goes with the banjo bolt. All kind of fuzzy now but I spent months toying with new o-rings and new hoses to no avail. Then several months later I had my mechanic replace a torn boot on the steering rack and he noticed the PS leak and put a new copper washer in, never had a leak since.
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Old 01-20-2014, 05:00 PM   #179
waynlewis
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Here's one for you guys to figure out... my ps pump is leaking from the seal where the two pieces meet (not too much), it's groaning n whining, it's got the shimmies, all symptoms of air in the line, etc... but the reservoir fluid doesn't appear to be going down at all. Where could the fluid be coming from then?? I have the o-ring and return line banjo washer to change. Thanks
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Old 01-22-2014, 07:55 PM   #180
oharao2
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Another satisfied o-ring replacement customer. Used the 11x14x2 on my 2008 gr. I think it needs to be the 11x16x1.75 or 1.5. As it didnt seal on the thicker 11x16x2.5. The stretching of the ring thined it out enough allow it to fit.

Last edited by oharao2; 01-22-2014 at 09:33 PM.
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Old 01-26-2014, 12:58 AM   #181
CallMeJag
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I just replaced my radiator and had to "push" the power steering line aside a bit to get the old one out. I guess in doing so, I upset the delicate balance the factory o-ring had in making the proper seal. After replacement, everything's all good again - no more noise, no more foaming in the reservoir.

Two things I'd like to note:
1.) The o-ring I took out (from the factory) didn't seem super old. Sure it was a bit stiff and plasticy, but it still had some bend in it. I figured it couldn't be the problem. I was wrong.
2.) Find the right o-ring. I had to go to Lowes, Home Depot, Autozone and finally to Ace Hardware to find the right one. The final o-ring wasn't nearly as tall as the factory one, but the interior and exterior dimensions were perfect. Made a great seal right away. I tried several others that were too fat or too wide in internal diameter.

Thanks to all the contributors in this thread!
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Old 02-10-2014, 10:42 AM   #182
fabrik8
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Does anyone have dimensions for the fittings themselves? There seems to be a lot of guess-and-check, which is a little sketchy for O-ring sizing. The ID stretch of an O-ring should be a max of about 5%, so that can be calculated from the fitting ID. Anything more than 5% can/will shorten the service life of the O-ring. That's a good start, and the other parameters (cross section, squeeze, gland fill, etc.) can have common sizing rules applied also.

Mine just started whining yesterday with increased effort after reinstalled the radiator; I guess I disrupted something. Hoping the O-ring is the problem, and I've already got some hose clamps that should fit the reservoir hoses.

I haven't pulled my fitting yet to measure because it just turned cold here and I need to drive the car so no real downtime.

I think the 04 WRX has the same pump as the STi of similar years, so this thread should be the right place...



I see people posting pictures like the one below, and it's really, really obvious that it isn't the proper size O-ring. That doesn't look anything like the proper O-ring for this application. It might fit, but only because it's stretched so much that it ends up close to what it should be. Bad.


Last edited by fabrik8; 02-10-2014 at 12:27 PM.
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Old 02-10-2014, 10:50 PM   #183
Scooby06doo
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Quote:
Originally Posted by STINM43 View Post
I am really needing some help in finding an o-ring that will fit a 2006 sti, I have tried many different sizes with no luck including Subaru part #s 34439FE000 and 34439AE020.

Has anyone had any luck finding an o-ring that works in a 2006-07 sti? If so please help..
11mmx14mmx2mm is what they said... i also heard 5/8 x 1/2 x 1/16 works
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Old 02-11-2014, 03:04 PM   #184
fabrik8
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Quote:
Originally Posted by Scooby06doo View Post
i also heard 5/8 x 1/2 x 1/16 works
That's the nominal size for a -014 o-ring, which is a standard size.

I just got a bag of HNBR -014 rings to try tonight, but I'm going to try to get actual measurements on that fitting to find out what o-ring is actually should be. It's 30 degrees and snowing and I don't have a garage at this particular moment so we'll see how that goes.

Last edited by fabrik8; 02-11-2014 at 03:23 PM.
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Old 02-11-2014, 04:10 PM   #185
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Quote:
Originally Posted by fabrik8 View Post

That's the nominal size for a -014 o-ring, which is a standard size.

I just got a bag of HNBR -014 rings to try tonight, but I'm going to try to get actual measurements on that fitting to find out what o-ring is actually should be. It's 30 degrees and snowing and I don't have a garage at this particular moment so we'll see how that goes.
I feel ya. It's 23 here, gonna get down near 0 tonight and up to a foot of snow tomorrow and my garage is so full of junk you can barely walk through it
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Old 02-11-2014, 08:07 PM   #186
fabrik8
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Looks like the HNBR -014 did the trick. There are still some fine bubbles circulating around the reservoir, but I don't know if that's residual air or a very minor leak at one of the hose clamps. I'm going to replace the hoses and clamps when the weather warms up. The fitting came right out in my hand which means there was no o-ring sealing ability left. I made no other changes except a fluid flush and bleed, so I could track what the problem is.

The -014 looks to be a good fit, about the right amount of stretch (maybe a tiny bit more than I would like) and felt like it seated well. I didn't get a chance to measure the fitting unfortunately. The old o-ring is 0.057" by 0.088" cross section (nicely flattened but not a rectangle), which is about the right sectional area to match the 0.070" of the -014. The -014 might be a tiny bit too small in sectional area I suspect. I'll cut the old ring tomorrow and try to dimension some of the geometry to get a better area calculation. For now I'm going to say that the -014 is a pretty damn good approximation of whatever the stock (metric) o-ring size is.

Time will tell.
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Old 02-11-2014, 08:13 PM   #187
Scooby06doo
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Good to know. Where did you get that oring? Dealership for the a/c compressor?
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Old 02-11-2014, 09:39 PM   #188
fabrik8
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I ordered a bag from McMaster Carr yesterday. Now I have 99 left.
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Old 03-04-2014, 02:07 PM   #189
R7MR7M
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I have the whine and replaced the o-ring awhile back. It seemed to help a little. Then it came back and now there is some shuddering when steering. I can't see any signs of a fluid leak so I am thinking I should replace the clamps.

Which clamps have you guys been using (or recommend)? Which should I stay away from?

TIA
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Old 03-04-2014, 02:15 PM   #190
fabrik8
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Quote:
Originally Posted by R7MR7M View Post
I have the whine and replaced the o-ring awhile back. It seemed to help a little. Then it came back and now there is some shuddering when steering. I can't see any signs of a fluid leak so I am thinking I should replace the clamps.

Which clamps have you guys been using (or recommend)? Which should I stay away from?

TIA
The O-ring may not be holding up over time. Mine had no indications of a fluid leak, it was simply sucking air into the system.

For clamps, new OEM clamps or a smoothbore worm/screw clamp would be best. You can't over-tighten the OEM clamps because there is nothing to over-tighten, which is nice.

I like the worm/screw clamps where the thread indents in the clamp body are embossed instead of stamped holes, and the edges are rolled instead of being sharp. This way the clamp doesn't cut into the hose at all. You don't have a lot of choices for clamp styles with a fairly small hose like that though, unless you want start digging into industrial supply catalogs and buying clamps by the bag.
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Old 03-04-2014, 02:18 PM   #191
R7MR7M
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Quote:
Originally Posted by fabrik8 View Post
The O-ring may not be holding up over time. Mine had no indications of a fluid leak, it was simply sucking air into the system.

For clamps, new OEM clamps or a smoothbore worm/screw clamp would be best. You can't over-tighten the OEM clamps because there is nothing to over-tighten, which is nice.

I like the worm/screw clamps where the thread indents in the clamp body are embossed instead of stamped holes, and the edges are rolled instead of being sharp. This way the clamp doesn't cut into the hose at all. You don't have a lot of choices for clamp styles with a fairly small hose like that though, unless you want start digging into industrial supply catalogs and buying clamps by the bag.
Thanks for the quick response. The o-ring was replaced about a month ago, so it wouldn't be deteriorating yet. I will check it to make sure it was not pinched or anything but I figured for the price of the clamps it wouldn't hurt to do that either.
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Old 03-05-2014, 11:55 AM   #192
R7MR7M
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Does anyone know the outer diameter of the hoses that attach to the power steering remote reservoir? My steering when standing is now bogging down the RPMs and an 1/8 of a turn of the steering wheel, there is a clank/thud a split second after turning the wheel, like the steering rack is catching up. Very strange.
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Old 03-05-2014, 08:04 PM   #193
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Quote:
Originally Posted by R7MR7M View Post
Does anyone know the outer diameter of the hoses that attach to the power steering remote reservoir? My steering when standing is now bogging down the RPMs and an 1/8 of a turn of the steering wheel, there is a clank/thud a split second after turning the wheel, like the steering rack is catching up. Very strange.
I'd lay under the car and inspect the rack bushings
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Old 03-05-2014, 09:17 PM   #194
R7MR7M
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Quote:
Originally Posted by Scooby06doo View Post

I'd lay under the car and inspect the rack bushings
Thanks, I will check it out.
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Old 03-15-2014, 03:11 PM   #195
R7MR7M
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I checked the newly-replaced o-ring and it looked fine. I then got some 7/8 worm drive clamps from O'Reilly and replaced the stock spring clamps on the thicker hose running from reservoir to the goose neck where the o-ring fits on the pump. The hose was kind of hard but I didn't have a hack saw so I just fit it back on and made sure it was seated properly and the clamp was aligned properly.

I went lock to lock slowly about 20 times. I could feel the air moving through the system at different times. But it got smoother and easier. The first time I drove it, there was a whine when cold and cranking it to back out of the garage but after that it has been SO much better. Smooth and easy to turn. I hadn't realized how much power assist I had lost.

That was last Saturday and it's been great ever since.
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Old 05-05-2014, 01:53 PM   #196
Bryan18
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Did you go lock to lock off the ground with the car off or at idle?
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Old 05-05-2014, 03:06 PM   #197
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Quote:
Originally Posted by Bryan18 View Post
Did you go lock to lock off the ground with the car off or at idle?
At idle
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Old 06-23-2014, 10:02 PM   #198
FATgc8
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Does anybody know if the orings/seals are going to be the same for a 4th gen (05-09) LGT as a WRX/STI?
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