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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

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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  #1  
Old 05-07-2013, 08:14 PM
SeanPhang SeanPhang is offline
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Location: Livermore, CA
 
Join Date: Aug 2010
Posts: 105
Mein Auto: 02' 530iA@143k
Talking difference noticed after DISA O-ring replaced

I was quite surprised because my car had 123k, and the DISA was in much better shape than I expected.

After reading some horror stories about how DISA destroyed engines, I pulled out my DISA and checked its health. Found almost no free play, except just a little bit on the steel pin end. The pin also did not really want to stay put. I took a closer look in the manifold and found the pin is seated in a closed area, so it should not be able to work itself out and into the engine unless the flapper was shattered. So I did nothing about it and put it back in.

But I put it back in twice today, the second time with a O-ring bought from ebay, and noticeable difference was observed the 2nd time. Low-end torque was back. I think the original o-ring has shrunken and has been letting in unmetered air.

On a side note, I might have found a good place to buy O-rings.
I think the link below has the correct DISA O-ring (#140) with a much better material (Viton, which is also used in the beisan VANOS kit). Very cheap for a 10-pack.
Viton DISA O-Ring
Maybe we can buy the VANOS O-rings here too, if we know the correct sizes (if standard).
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06/10: rear shocks
08/11: cooling overhaul, O2 sensors
09/11: auto transmission drain & refill
09/12: alternator, VANOS seals, differential oil change
04/13: 2nd auto transmission drain & refill, changed fuel filter
12/13: OFH gasket
05/14: Aux. fan
09/14: CCV

Last edited by SeanPhang; 05-07-2013 at 08:21 PM.
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  #2  
Old 05-07-2013, 08:49 PM
edjack edjack is offline
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Location: San Jose, CA
 
Join Date: May 2007
Posts: 9,522
Mein Auto: '97 540i 6 speed
Thanks for the feedback!!!
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Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
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  #3  
Old 05-08-2013, 03:49 AM
bluebee's Avatar
bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
 
Join Date: Mar 2008
Posts: 21,823
Mein Auto: 02 BMW 525i M54 auto 130K
See also:
- Where to get just the DISA valve o-ring (1)
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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  #4  
Old 05-08-2013, 05:43 AM
Dragan Dragan is offline
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Location: Thunder Bay, Ontario
 
Join Date: Jan 2013
Posts: 169
Mein Auto: 2002 BMW 530i Sport 5 Spd
I'm surprised you didn't buy the G.A.S. DISA repair kit. Fixes all the problems associated with the DISA valve.
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2002 530i Sport Package 5-speed
Style 42s for summer
Style 29s for winter
CDV delete
Skibag retrofit
G.A.S. DISA Valve Repair Kit
G.A.S. 1.2 Bar Expansion Tank Cap
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  #5  
Old 05-08-2013, 08:43 AM
SeanPhang SeanPhang is offline
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Location: Livermore, CA
 
Join Date: Aug 2010
Posts: 105
Mein Auto: 02' 530iA@143k
I am aware of the kit. Just thought mine was still in pretty good shape and could postpone it for another 20k.
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06/10: rear shocks
08/11: cooling overhaul, O2 sensors
09/11: auto transmission drain & refill
09/12: alternator, VANOS seals, differential oil change
04/13: 2nd auto transmission drain & refill, changed fuel filter
12/13: OFH gasket
05/14: Aux. fan
09/14: CCV
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  #6  
Old 05-08-2013, 11:29 AM
OzzieH OzzieH is offline
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Location: Idaho
 
Join Date: Sep 2010
Posts: 68
Mein Auto: 2002 530i
I was just about to start a posting about the same. Car is 2002 530i, MT, 100,000 miles. I had to replace the brake booster check valve not long ago and decided to look for other vacuum problems. At the back of the intake manifold, I have 3 ports, two are smaller. The vacuum line to the electro-vacuum switch for secondary air pump is connected to one. The other smaller port didn't have a cap and the larger cap was deteriorating. So I fixed all that, but the biggest improvement was purchasing the blue o-ring from German Auto solutions. You have to scrape the "built-in" o-ring out. I just used pick tools--it took about 20 min to get this perfectly clean.
A noticeable improvement in performance. I also feel my shifts are more precise for whatever reason.
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  #7  
Old 05-08-2013, 11:35 AM
SeanPhang SeanPhang is offline
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Location: Livermore, CA
 
Join Date: Aug 2010
Posts: 105
Mein Auto: 02' 530iA@143k
Yes, the scraping is the most time-consuming part. Don't want to nick the plastic. And the molded gasket does not want to come off.

One question for you, OzzieH, maybe a dumb one, are the vacuum hoses all the same, I mean, ID? I may want to refresh some of those too.
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06/10: rear shocks
08/11: cooling overhaul, O2 sensors
09/11: auto transmission drain & refill
09/12: alternator, VANOS seals, differential oil change
04/13: 2nd auto transmission drain & refill, changed fuel filter
12/13: OFH gasket
05/14: Aux. fan
09/14: CCV
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  #8  
Old 05-08-2013, 02:36 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
 
Join Date: Mar 2008
Posts: 21,823
Mein Auto: 02 BMW 525i M54 auto 130K
Quote:
Originally Posted by SeanPhang View Post
are the vacuum hoses all the same, I mean, ID?
See also this, found by typing /vacuum F3 in the best links:

- How to locate all problematic (between 1/8" & 9/32" ID) 3.5x1.8mm, 3.3x1.8mm & (between 17/64" & 9/32" ID) 7mm ID vacuum tubing (single material), vacuum hoses (multiple material), 3.3mm OD curved vacuum pipes (rigid tubes), 3.5mm & 7mm ID vacuum endcaps (closed end) & 7x3mm manifold o-rings (1) & 7.52X3.52mm and 9.2X2.8mm fuel injection o-rings (1) & gaskets (1) on the M54 engine & where in the USA to get new vacuum tubing & vacuum caps (1) & what SAE sizes to get for all the metric M54 engine vacuum tubes, hoses, pipes, and caps (1) & correcting the F-connector errors in the realoem diagrams (1) & finding the ends of hard-to-locate vacuum tubes (1) & sorely needed clarification on how the M54 CCV vacuum port works on the M52 CCV valve connection to the fuel pressure regulator connection (1) & how to make, borrow, or buy lean-condition misfire test tools to test for vacuum leaks & lean conditions (1) (2)
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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  #9  
Old 05-08-2013, 08:43 PM
OzzieH OzzieH is offline
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Location: Idaho
 
Join Date: Sep 2010
Posts: 68
Mein Auto: 2002 530i
Looks like Bluebee covered it in detail. My brake booster hose from the sucking jet pump to the brake booster looked a bit flat. I replaced it with the correct BMW hose since I had to replace the brake booster check valve. I replaced the vacuum line from the intake manifold that goes to the secondary air pump system. You have a few pieces to replace. I used 5/32 vacuum hose. I know it is larger ID than the 3.3 mm hose but all the connections felt quite snug. A 9/64 hose would be perfect--don't know if such is made. For the two end caps, I just purchased a mixed assortment of end caps from O'Reillys. There are a few different sizes. They feel like vinyl. I fitted the one that felt snug. I used the same 5/32 hose for the small hose that goes from the F connector to the hard vacuum hose near the left shock tower. I believe that is a fuel pressure regulator vacuum hose.
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  #10  
Old 05-09-2013, 09:30 AM
SeanPhang SeanPhang is offline
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Location: Livermore, CA
 
Join Date: Aug 2010
Posts: 105
Mein Auto: 02' 530iA@143k
Thanks for the detailed reply!
__________________
06/10: rear shocks
08/11: cooling overhaul, O2 sensors
09/11: auto transmission drain & refill
09/12: alternator, VANOS seals, differential oil change
04/13: 2nd auto transmission drain & refill, changed fuel filter
12/13: OFH gasket
05/14: Aux. fan
09/14: CCV
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  #11  
Old 05-09-2013, 01:41 PM
poolman poolman is offline
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Location: martinsville va
 
Join Date: Nov 2005
Posts: 3,999
Mein Auto: 525i station wagon
Go to the search engine and try ---- Vacuum Leaks Revisited ---- wrote that one up a year or two ago and it points out all the spots that need to be addressed when trying to head off vac leaks in our 5 series cars.
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  #12  
Old 05-09-2013, 02:25 PM
SeanPhang SeanPhang is offline
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Location: Livermore, CA
 
Join Date: Aug 2010
Posts: 105
Mein Auto: 02' 530iA@143k
I believe you are refering to this very helpful thread!
Vacuum leaks revisited I-6 Engines
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06/10: rear shocks
08/11: cooling overhaul, O2 sensors
09/11: auto transmission drain & refill
09/12: alternator, VANOS seals, differential oil change
04/13: 2nd auto transmission drain & refill, changed fuel filter
12/13: OFH gasket
05/14: Aux. fan
09/14: CCV
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  #13  
Old 05-26-2013, 06:45 PM
Max_VQ Max_VQ is offline
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Location: earth
 
Join Date: Jul 2007
Posts: 568
Mein Auto: little red wagon
Just for reference, here is my DISA from my 2001 530 with 200,000 miles:


I added a little O2 safe gasket maker to the o-ring and re-installed it.
It looks like not all DISAs are falling apart.
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