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Brakes & Suspension Forum sponsored by The Tire Rack |
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03-09-2013, 07:42 AM | #226 |
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Location: RomeoVille
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^^^ LACk of operation. Cars that sit not driven for lengthy periods **** starts failing
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03-09-2013, 01:08 PM | #227 |
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Member#: 121226
Join Date: Jul 2006
Location: Texas
Vehicle:2004 Impreza WRX Rally Blue |
For those that are not having good results after assembling their pump, make sure that the front and rear plates (i.e., the plate at the front near the shaft seal and the rear case) are assembled correctly with respect to their rotation about the shaft. The rear case is fixed and can only go on one way, but the front plate can be incorrectly installed.
The pin that the internals rotate about (at the bottom of the pump) must fit into the front plate (there is a small hole) as well as the rear case. You can see this hole in the pictures at the beginning of this thread. It is possible to assemble the pump without lining it up, but it requires a lot of force since the pin sticks out further and deforms the rear case. (Don't ask how I know.....) At any rate, the grooves that pass through each plate should be 180 degrees from each other. That way the fluid can come through the back (I think) and go out through the front. If you put them where they line up with each other (incorrect), the pump won’t deliver any pressure. I tried to post some pictures with arrows to make this more clear, but I wasn’t smart enough to do it without authority to post attachments. |
03-10-2013, 06:38 AM | #228 |
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Member#: 151245
Join Date: Jun 2007
Chapter/Region:
South East
Location: Central Florida
Vehicle:2006 WRX Wagon Silver |
Though I'm no scientist, I would imagine the rubber bits are degrading as soon as they are exposed to the environment. In. The case of the power steering pump, the environment includes automatic transmission fluid. I'd bet the metal parts of the pump are near perfect, but all the little rubber o-rings (and hoses, belts, and tires) are getting older and drying out or degarding. Fluids too (i'll bet you've changed the oil more than once even though there's only 3700 miles on it).
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03-15-2013, 03:45 PM | #229 |
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Member#: 291274
Join Date: Aug 2011
Chapter/Region:
MWSOC
Location: Livonia,MI
Vehicle:2004 Impreza WRX STi PSM |
*** Update again ***
** 1x MS28775-015 - FEP Encapsulated 1x MS28775-017 - FEP Encapsulated 1x MS28775-021 - FEP Encapsulated 1x MS28775-037 - FEP Encapsulated 1x MS28775-136 - FEP Encapsulated 3x MS28775-014 - FEP Encapsulated 100x MS28775-013 -Buna N per post #9 ** I replaced the 2 inside seals, the big one and the small one were the only 2 I replaced INSIDE the pump itself W/ FEP. Not leaking yet. Hopefully it stays that way... I will update if it doesnt. EXTERNALLY- Also did the sensor on the back with a new o-ring, the bolt one with the spring, and the inlet joint o ring with FEP. A total of 5 replaced all FEP... crossing my fingers they hold tight. Sidenote.. Also rebuilt my alternator with new bearings, they originally swapped the regulator too.. I installed and had battery light,brake light,r diff temp light on+ No charging... Removed and they put the OEM regulator back on and everythings back to normal on the alternator.[/i] My pump is LEAKING AGAIN.. looks like the big o ring is the culprit. the one that seals the 2 halves together. I HIGHLY suggest people stay away from FEP encapsulated o rings to do this job. Bottom line the big o ring is just too THIN to seal correctly. Shoulda thrown the thing in the garbage. Will be rebuidling again, and replacing just the 2 o rings that are required the big one and the smaller one that comes off when you seperate the 2 halves of the pump (4 bolts) |
03-16-2013, 07:40 AM | #230 | |
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Member#: 151245
Join Date: Jun 2007
Chapter/Region:
South East
Location: Central Florida
Vehicle:2006 WRX Wagon Silver |
Quote:
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03-16-2013, 07:12 PM | #231 | |
Scooby Newbie
Member#: 291274
Join Date: Aug 2011
Chapter/Region:
MWSOC
Location: Livonia,MI
Vehicle:2004 Impreza WRX STi PSM |
Quote:
Reinstalled last night with regular thicker black o rings from hardware store, so far so good.. if this thing leaks again however Im going w a new or reconditioned pump for exchange. *!*!* 1 week later not leaking anymore with a black buna-n style o ring, thicker and seems to have sealed great! Last edited by Drk93TT; 03-24-2013 at 08:39 PM. |
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04-08-2013, 11:59 AM | #232 |
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Member#: 344857
Join Date: Jan 2013
Vehicle:2005 WRX Wagon World Rally Blue |
Rebuilt mine this weekend with all FEP orings. ~50 miles so far, no leaks.
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04-10-2013, 11:58 PM | #233 |
Scooby Newbie
Member#: 235987
Join Date: Jan 2010
Location: Denver CO
Vehicle:04 WRX VF22 JBP |
I also would recommend using standard o rings for this, the black buna n.
I rebuilt once using the fep, worked for awhile, perhaps never quite had full assist, but then the pump started leaking again onto the engine block. Went down to rocket seals (they are local to me) and the guy there said that the buna n rings were more than sufficient for ATF. He also said he has recieved many orders and walk in customers rebuilding subaru p.s. pumps I believe as a direct result of this thread. I recommend Rocket Seals. Thank you cadillac and this thread, saved me a bunch of cash. But anyway I think the black rings are the way to go. My pump is now better than ever. Even if the buna n doesnt last quite as long, this rebuild is pretty simple especially if you have done it once or twice already. I got confused in a couple places but just zoomed in on cadillacs pics and was good to go. |
04-11-2013, 12:15 AM | #234 | |
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Member#: 235987
Join Date: Jan 2010
Location: Denver CO
Vehicle:04 WRX VF22 JBP |
Quote:
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04-13-2013, 09:09 PM | #235 | |
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Member#: 95901
Join Date: Sep 2005
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Quote:
Buna N is not that expensive. Just get them from a quality hardware store. 68 |
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04-14-2013, 07:43 PM | #236 | |
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Join Date: Sep 2005
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Quote:
You're welcome. |
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04-15-2013, 10:53 AM | #237 |
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Join Date: Feb 2013
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Location: Newport News
Vehicle:2015 WRX Ice Silver |
Thanks for the thread and all the hard work. After viewing this write up, I have just placed an order with Rocketseals and will be tackling this job ASAP. I went with just Buna N all around. I will let this thread know how it goes.
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04-15-2013, 10:52 PM | #238 |
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Join Date: Apr 2013
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Awesome DIY, thanks
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04-29-2013, 12:16 PM | #239 |
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Join Date: Mar 2012
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2004 WRX
I did the rebuild about a month ago and everything had been going ok until yesterday. I was driving down the road and heard what sounded like a rock being thrown in my car. I later found out that the nut holding the pulley onto the power steering pump came off. As i was pulling into a parking lot the steering became hard and it felt like there was grinding. I opened the hood to find the pulley off the shaft. The teeth on the power steering pump shaft and the teeth on the pulley were stripped. I don't know what caused it. I thought maybe the bearing failed but I can still twist the shaft fairly easily so I don't know if it possible that the orings inside caused some failure/seizure of the pump or I had the belt too tight. My problem now is that I need a new pump and pulley. The refurb pumps at o'rielly don't come with pulleys and the dealer doesn't sell pulleys separate, only with a new pump. Anyone have any ideas on what caused problem and/or any suggestions on what to do? Last edited by egibson0205; 04-29-2013 at 01:46 PM. |
04-29-2013, 06:31 PM | #240 |
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Join Date: Sep 2005
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05-03-2013, 01:14 PM | #241 |
Scooby Newbie
Member#: 152803
Join Date: Jul 2007
Chapter/Region:
Tri-State
Vehicle:2010 STi WRB |
Anyone with a GR (08+) STi replace their O-ring? Is it the same as previous years? My 2010 has been whining for a few weeks now, started getting louder during the colder months. Seems to quiet down a bit after the car's warmed up but it's still noticeable, especially at low speeds/standstill. No bubbles in the reservoir and steering feels fine, but that whine is irritating!
I've been to a few local shops and I haven't found an O-ring that matches the sizes posted on this and other threads yet. |
05-03-2013, 02:48 PM | #242 |
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Join Date: May 2013
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Having the same issue. This post helped.
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05-03-2013, 08:48 PM | #243 |
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Join Date: Dec 2005
Chapter/Region:
TXIC
Location: Waco, TX
Vehicle:2004 STi gt30r Black |
This thread made my day! Thanks for sharing your time and efforts! I have had a slow, seeping leak for a long time and couldn't figure it out until today. Noticed the pump was the culprit.
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05-04-2013, 05:40 AM | #244 |
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Join Date: Jun 2007
Chapter/Region:
South East
Location: Central Florida
Vehicle:2006 WRX Wagon Silver |
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05-28-2013, 06:09 PM | #245 |
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Rebuilt my pump over the weekend. '06 STi. I can verify the -119 size for the innermost o-ring and the additional -014 between the case halves. I used FEP for the -119 and Green HBNR for the rest. Successful so far. Not one peep from the pump.
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06-07-2013, 05:41 PM | #246 |
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I suggest people reconsider using the FEP rings. Go with the buna-n. A few days after I rebuilt the pump with FEP rings, the pump was whining like a banshee and sucking in air. I replaced the small oring on the spigot piece that is secured with the 10mm bolt with just a regular black o-ring and the whining stopped.
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06-22-2013, 06:45 PM | #247 | |
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Quote:
I'd look to your installation procedure. Perhaps you cut or pinched on install. Maybe the air-bleeding process didn't work the first time. Air in the lines causes whining. Under tightening of the "spigot". There's a whole host of things I'd look at before I'd blame the FEP material. There's a whole host of fellas on this forum that have posted how well the FEP seals. You're the first to post it didn't. It's not the FEP. I think something else went wrong. |
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07-07-2013, 06:30 PM | #248 |
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Member#: 19018
Join Date: May 2002
Location: Maribor, Slovenia
Vehicle:1995 Legacy Wagon Silver |
I just found this thread as my 06 Legacy's steering pump needs some 'love' too... It's not leaking fluid, just seems to suck in air.
But unfortunately, it seems the design is not the same and O-ring sizes seem to be different... I'll take the Vernier caliper tomorrow and post the pictures and measurements. D. |
07-08-2013, 06:51 PM | #249 |
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Member#: 19018
Join Date: May 2002
Location: Maribor, Slovenia
Vehicle:1995 Legacy Wagon Silver |
As mentioned before, I have two PS pumps off a Subaru Legacy BP. They are quite similar, but not exactly the same.
One is off a 2006 Legacy BP 2.0R (DOHC NA engine) and was originally in my car, and the other is off a 2005 Legacy BP 3.0 AT. While the two engines have very different brackets for the PS pump, the actual pump looks almost the same. There are, however, two differences - the one of a 3.0 engine is 2.5-3mm 'deeper' (if you look right at the pulley) AND it has a different pulley (it's wider and has one more 'rib'). The bracket is designed with a movable bushing, so the depth of the pump is not much of a problem. The pulley, on the other hand, obviously is - so to use the 3.0 pump in my car, I had to swap the pulley, which is press fitted onto the axle. To get the axle out, I had to disassemble both pumps, remove a small circlip and the axle with the pulley simply slid out. Having access to a 40T hydraulic press made it easy to swap the pulley. Opening up both pumps also revealed the reason why the 3.0 pump is bigger - internal parts (the 'drum', the vanes, ...) are all bigger and the service manual confirms that the 3.0 pump actually has higher specs in flow and pressure... Anyway - right now the 3.0 pump is in my car and it works - unfortunately it didn't cure the issue - a loud whining noise whilst turning the steering wheel. Obviously, that led me to this thread... After going through all the posts in this thread I decided to (potentially) sacrifice my old pump and take it apart completely just so I could take photos and compose a list of parts that may be needed for a 'partial rebuild'. First a couple of introduction photos: It looks fairly similar to what I've seen in this thread (mind you this is the pump from my 2.0R with the 3.0 pulley). However, similarities end here - the O-ring that is usually responsible for letting air in is 14x17x2mm. That's the actual measurement of the original O-ring, but I guess it's a bit squashed: Here is the pump with the 'back cover' off - you can see two smaller O-rings on the main body and a larger one on the cover: Can't fit more images in a single post, so I'll go in in the next one... |
07-08-2013, 06:58 PM | #250 |
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Join Date: May 2002
Location: Maribor, Slovenia
Vehicle:1995 Legacy Wagon Silver |
First the smaller O-rings:
And now the large one- I noticed that there is a shallow groove where this O-ring seats: * the second measurement is with the original O-ring in place... And here's what this O-ring is supposed to seal against - that edge is a bit slanted: Here's the circlip on the axle and the axle removed: To be continued... |
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