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 > Technical Articles: / BMW Z3 (1996-2002) >
Replacing Your BMW Flex Disc
 
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Pelican Technical Article:

Replacing Your BMW Flex Disc

Nick Czerula

Time:

3 hours3 hrs

Tab:

$200

Talent:

****

Tools:

Set of sockets 10mm, 18mm, 18mm wrench

Applicable Models:

BMW 325i Sedan (2006)
BMW 325xi Sedan/Wagon (2006)
BMW 328i Coupe/Conv (2007-09)
BMW 328i Sedan/Wagon (2007-09)
BMW 330i/xi Sedan (2006)
BMW 335i Coupe/Conv (2007-09)
BMW 335i Sedan (2007-09)

Parts Required:

Driveshaft flex-disc, Driveshaft flex-disc fasteners, exhaust gaskets and hardware

Hot Tip:

Work with a cool engine

Performance Gain:

Smooth drivetrain

Complementary Modification:

Replace transmission mounts
The driveshaft flex-disc is used to connect the transmission to the driveshaft. It is made of solid rubber and wears out over time. You may experience a drivetrain vibration or shimmy. If so, inspect your driveshaft flex-disc. It should be free from distortion, cracks, tears and have no missing pieces. If you find any of these problems, replace the driveshaft flex-disc and mounting fasteners. 
To access the driveshaft flex-disc, you have to remove the exhaust system and exhaust heat shield.
Figure 1

To access the driveshaft flex-disc, you have to remove the exhaust system and exhaust heat shield. When replacing, at the minimum, replace the self-locking nuts that attach the driveshaft flex-disc. I prefer to replace the bolts too. The driveshaft flex-disc is also referred to as the Guibo. Raise and support rear of vehicle on jack stands. See our tech article on jacking up your vehicle. If you have an AWD BMW E90, remove complete exhaust system. See our tech article on exhaust system removing. Then remove the center heat shield that runs along the driveshaft tunnel.

Working at transmission, remove three18mm driveshaft flex-disc fasteners.
Figure 2

Working at transmission, remove three18mm driveshaft flex-disc fasteners. (green arrows)

Using a prybar or large flatblade screwdriver, lever driveshaft away from transmission.
Figure 3

Using a prybar or large flatblade screwdriver, lever driveshaft away from transmission. Support driveshaft using rope or mechanic's wire. You won't need much force to do this. If it won't move, you may have left a bolt in place.

Next, working at transmission flange side, remove three driveshaft flex-disc mount fasteners.
Figure 4

Next, working at transmission flange side, remove three driveshaft flex-disc mount fasteners. (green arrows) Be sure to replace nuts for flex-disc. They are self-locking and should not be reused. Install new driveshaft flex-disc onto driveshaft and install fasteners finger tight. (The arrows on the flex-disc should point toward the flange.) Then install driveshaft flex-disc to transmission and tighten fasteners. Then tighten driveshaft flex-disc to driveshaft fasteners. Finally, install any items you removed to improve access.

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Comments and Suggestions:
Dwayne Comments: In the writeup you mentioned you would replace the bolts too. What is the part number for these bolts?
April 19, 2017
  Followup from the Pelican Staff: You didn't mention your vehicle info. To find the part numbers, use the part look up tool on the right side of the page, the bolts are shown: http://www.pelicanparts.com/BMW/techarticles/BMW-3-Series-E90/TRANS-Driveshaft_Flex_Disc_Replacement/TRANS-Driveshaft_Flex_Disc_Replacement.htm - Nick at Pelican Parts  
Ed Comments: I just completed the Flex Disc install on my E90 2006 - 325i. You do not need to remove the exhaust. The heat shield can be separated in the middle. Once you unfasten the front portion of the heat shield, you can shift this out of the way in order to access the flex disc.
March 22, 2017
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
Maverick Comments: Hi, I worked on a Mercedes e320 and they have two flex discs. Front and rear. Does the 2008 335i e90 RWD Sedanhave 1 or 2 flex discs?
December 14, 2016
  Followup from the Pelican Staff: 1.

Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
chris Comments: IM looking for a guibo for a 325i 2009 sedan??
April 7, 2016
  Followup from the Pelican Staff: I’m not the best with part numbers.

Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Patrick Comments: When i drive, i like to keep my hand on the shifter manual transmission e91 model from 2009 and currently i feel a distinct thumping in my shifter whenever i accelerate or drive speeds above 60mph. Mostlty noticable around 2000rpm. Could it be my flexdisc is worn out or that the center bearing has seen its best days? Thank u in advance
December 19, 2015
  Followup from the Pelican Staff: Sounds like a center bearing. however, I would inspect the entire driveshaft to be sure. - Nick at Pelican Parts  
scarls2000 Comments: Just one more quick question. Are there 2 flex discs front & rear for the AWD 328? thanks
November 19, 2015
  Followup from the Pelican Staff: Yes, there are two. - Nick at Pelican Parts  
scarls2000 Comments: 2007 BMW 328 xi. Is it absolutely necessary to drop the exhaust? From getting underneath it seems it may be possible? I really don't want to touch exhaust..
November 19, 2015
  Followup from the Pelican Staff: As far as I know, yes you have to. - Nick at Pelican Parts  
Monty Comments: On my 335i coupe i was unable to pull the drive line out of the transmission do you need to have the exhaust off for this job?
February 21, 2015
  Followup from the Pelican Staff: I only recall the exhaust having to come out on all-wheel drive models. - Nick at Pelican Parts  
matt Comments: The flex disc has to be installed with the pointed markings on the disc aimed at the the the respective drive shaft, or transmission flange, bolt hole that your connecting to. Install it any other way and it will be ruined in short order. The disc can face either way but it's very important that the pointed part of the markings aim at the component you are connecting it to.
December 4, 2014
  Followup from the Pelican Staff: Yes, this is correct. Follow the embossed arrows on the flex-disc. - Nick at Pelican Parts  
AW Comments: Is there a torque spec for these bolts?
July 26, 2014
  Followup from the Pelican Staff: Yes. I don't have the handy.I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 

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Page last updated: Sat 4/29/2017 02:24:35 AM