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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #26  
Old 03-18-2010, 02:06 PM
crazyguy crazyguy is offline
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Quote:
Originally Posted by shenecke View Post
Sorry but I replaced the oring and redid the hoses below and the resivour still has an oil residue on it. Each time I'm under the hood I have to wipe it off with a paper towel. Not alot of fluid but enough to attract dirt and make the paper towel black.
any idea where the leak comes from ?
did u reuse the oem clamps or u used the screw clamps?
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  #27  
Old 03-18-2010, 02:06 PM
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What exactly does "redid the hoses" consist of?
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  #28  
Old 03-18-2010, 06:52 PM
cn90 cn90 is offline
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What exactly does "redid the hoses" consist of?
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  #29  
Old 03-19-2010, 01:34 PM
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shenecke shenecke is offline
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Re-did the hoses like above with screw clamps.
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  #30  
Old 03-19-2010, 06:20 PM
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Well sounds like you're a perfect candidate for the debadged M5 sock mod then.
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  #31  
Old 03-27-2010, 11:44 PM
Rjim Rjim is offline
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Originally Posted by cn90 View Post
I used to think so too, but it is not true.

After I changed the O-ring ($5 item at dealer) on the PS Cap, it is nice and dry, VERY VERY EASY to do. Go to dealer, they always have these O-rings in stock:
http://www.bimmerfest.com/forums/sho....php?p=4633012

cn90, you were right on about the o-ring. I replaced mine, and it is a bit hard to locate even though it's right in front of your face, just beneath the reservoir cap...just blends in with the black cap screw threads all slick with ATF. After a week the cap and reservoir are much less wet, if not yet as dry and dusty as everything else under the hood. Seems like hoses and o-rings of a different composition would be better suited for use in contact with ATF. Wonder if BMW is using the same material on newer models?
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  #32  
Old 03-28-2010, 02:54 AM
E39er09 E39er09 is offline
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You need the SOCK MOD!
Hilarious video!!!!!!!!!!!!1
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  #33  
Old 03-28-2010, 10:00 AM
Ryan M Ryan M is offline
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If you look at the design of the cap, the hole goes from the outside of the cap down through the dipstick/shaft completely having nothing to do with the o ring. I don't see how replacing the o ring will fix this issue.
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  #34  
Old 03-28-2010, 10:09 AM
mujjuman mujjuman is offline
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Wow this is like breaking news... I venture out to the E39 forums and I see this!
So many people are plagued by this problem
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  #35  
Old 03-28-2010, 10:12 AM
mujjuman mujjuman is offline
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Originally Posted by Ryan M View Post
If you look at the design of the cap, the hole goes from the outside of the cap down through the dipstick/shaft completely having nothing to do with the o ring. I don't see how replacing the o ring will fix this issue.

You have a point... If the oil is leaking from the vent hole, it won't fix anything. However, if the seal on the cap has been compromised, then this should remedy the problem.
I just wipe the reservoir clean monthly and check level and fill accordingly.
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  #36  
Old 03-28-2010, 12:50 PM
Ryan M Ryan M is offline
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Originally Posted by mujjuman View Post
You have a point... If the oil is leaking from the vent hole, it won't fix anything. However, if the seal on the cap has been compromised, then this should remedy the problem.
I just wipe the reservoir clean monthly and check level and fill accordingly.
This is what I am thinking. I agree. I think a small amount of fluid will always splash out from the vent hole. But if you reservoir is caked with dirt and oil around the cap then you probably have a problem with the o ring sealing.
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  #37  
Old 03-28-2010, 01:50 PM
Rjim Rjim is offline
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Just put a piece of cotton from a q-tip in the end of the vent hole. Will see how much fluid it collects.
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  #38  
Old 03-28-2010, 02:18 PM
Takechan Takechan is offline
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I replaced the o-ring on my cap and it solved the problem. I'm sure it could spill out of the vent hole at one point but it hasn't yet. I can feel now when I tighten the cap that it isn't grinding directly onto the reservoir (like it used to)!
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  #39  
Old 04-29-2010, 01:18 AM
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FWIW, here's a DEXRON III (DEXRON VI) article that has some interesting points ... http://www.sandyblogs.com/techlink/2009/05/

For example, "All licenses for DEXRON-III expired at the end of 2006 and will not be renewed", so we can't even rely on the wording of bottles that still say Dexron III compatible because GM won't test and certify that anymore.

BTW, here are some photos of my power steering showing the HOLE that apparently allows seepage if the fluid level rises too high (or if the E39 goes upside down).

Notice also the slit in the tube which presumably performs some function related to the seepage ...

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  #40  
Old 04-29-2010, 06:27 AM
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DHoang DHoang is offline
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A proper functioning system should NOT be SEEPING. If seeping and leaking is occurring out the reservoir, this is indicative of the filter(s) in need of replacement. Even an oring won't stop it, due to the design of the cap having a hole there to release pressure. what'll cure this to is replace the filter. Unfortunately, this requires replacing the entire reservoir, if it's that internal filter. I think there's even a second filter that's placed inside the return hose as well, since there's a metal band crimped around a section of that hose.

One way to find out how effective or ineffective the filter is flowing is to have someone turn the wheels back and forth rapidly while you look at the fluid level inside the reservoir. The fluid should be dead still, no bubbles, dead calm. If you see the level begin to rise, or bubbles, or swirls, then there's suspicion that the filter's backing up the fluid flow.
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Last edited by DHoang; 04-29-2010 at 06:40 AM.
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  #41  
Old 04-29-2010, 08:15 AM
cn90 cn90 is offline
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Actually in my case, replacing the O-ring solved the problem, reservoir is nice and dry!
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  #42  
Old 04-29-2010, 08:54 AM
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Your case is exemplary, as always....
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  #43  
Old 04-29-2010, 09:37 AM
cn90 cn90 is offline
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For the last 4 years owning this car, I always thought the wetness comes from the PS reservoir vent hole.
So I decided to give the O-ring a chance and sure enough, the new O-ring solved the problem.
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  #44  
Old 04-29-2010, 10:30 AM
Rjim Rjim is offline
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Quote:
Originally Posted by cn90 View Post
For the last 4 years owning this car, I always thought the wetness comes from the PS reservoir vent hole.
So I decided to give the O-ring a chance and sure enough, the new O-ring solved the problem.
I agree. My reservoir is much drier with a new O-ring. But I think, Ryan M is also correct that a small amount of fluid will drip out of the vent hole cap, especially if the reservoir is overfilled. The small piece of cotton I put part way into the vent hole of my cap is acting like a filter and gradually turning pink. Also, for anyone who trims and reclamps the reservoir hoses, the bottom end of the larger diameter hose is probably leaking at the PS pump as well. At least mine was.
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  #45  
Old 04-29-2010, 01:31 PM
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With respect to filters, am I correct to assume there is a filter inherent in the PS reservoir which is replaced by replacing the reservoir ... and there is a filter in the PS hose which is replaced separately?
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  #46  
Old 04-29-2010, 02:44 PM
Ryan M Ryan M is offline
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I have never heard of a filter in the power steering system other than the one in the reservoir. I don't claim to know everything, and could be wrong, just saying that it would be news to me.
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  #47  
Old 04-29-2010, 06:34 PM
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i never noticed if my reservoir was leaking or wet but after reading this eariler i checked and sure enough i had to change the O ring seal .
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  #48  
Old 05-25-2010, 04:16 PM
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The difference between my old power steering reservoir cap o ring and the new o-ring wasn't as dramatic as cn90's or Scott, at magnum's ...

My old o-ring is slightly larger, slightly flatter, and slightly more worn than the new one.

I STILL have a cold-start squeal that I think is related to the power steering, but, at least I won't have an always-wet power steering reservoir!


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  #49  
Old 07-29-2010, 09:59 AM
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Originally Posted by bluebee View Post
I STILL have a cold-start squeal that I think is related to the power steering, but, at least I won't have an always-wet power steering reservoir!
While I'm waiting for parts, it would be a shame if the power steering pump (PSP) were the cause of my engine squeal.

How can you TEST the psp when you have it accessible?

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  #50  
Old 07-29-2010, 10:39 AM
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Have the idler pulleys been replaced lately? The accessory (water pump/power steering/alternator) pulley on my car was making a squealing and rattling noise. Once I replaced it the noise disappeared.
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