Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

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

Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 11-29-2012, 11:53 PM
oltom oltom is offline
Registered User
Location: Floida
Join Date: Nov 2012
Posts: 18
Mein Auto: 530i
D-G Drum failure Root Cause

Hello ALL
This post for info only. If previously posted please forgive. Just purchased a 2001 530i with 77K on the clock. Transmission is working fine with NO codes present. Before purchase I knew of this problem area. Before being left on the side of the road I decide to tackle this problem. After talking with numerous associates from ZF transmissions this is what I learned. Yes the D-G drum is light weight and needs to be replaced but the root cause is in the main valve body. Pull up the explode view of the trans. valve body. Find the main valve body part number. Find part number 50.010 or ZF part number 1060 327 138. Locate bore number 50.100. This is the modulation pressure port. It's job is to regulate transmission pressure and does so by continuous rapid cycling. Over time the piston laps or wears the bore of the valve body making it egg shaped, as a result constant pump pressure (approximately 850psi) slips past part 50.100 and puts constant pressure on the clutch pack. The end result BAM! If you've installed a new D/G drum and did not address this, it's only a matter of time.
The good news is that you don't have to pull the tranny to change this part. Drop the pan, the lower valve body plate the neck of the transmission filter goes through is the culprit. When swapping out the piston components no o rings are required. The best price I could find is $140 at CTSC (California transmission supply company). If you don't have a $140 look up Sonnax.com. Valve body's is all they do. They have a modification fit which includes a reaming fixture tool to over bore the port and an over size piston for the hole. Price for this tool unknown to date.
This also appies to Audi, VW Passet, Porsche, and several others.
My contacts: Lory transmission (ZF rep) Miami, Fl.
Eriksson Industies Old Saybrook, Conn.
Need a new tranny... check out Trans Specialties Wayne, NJ., autotransparts.com
Price $2000 plus tax, shipping $125, and $750 core. This tranny indules ALL modification/upgrades and includes a torque converter.
Good Luck and pass this on.
Reply With Quote

See More Related BMW Stories

Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

All times are GMT -7. The time now is 09:34 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
© 2001-2015 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms