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Driveshaft Flex-Disc Replacement
 
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Pelican Technical Article:

Driveshaft Flex-Disc Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$200

Talent:

****

Tools:

Set of sockets 10mm, 16mm, 16mm wrench

Applicable Models:

BMW Z3 (1996-02)

Parts Required:

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

Hot Tip:

Work with a cool engine and allow exhaust to cool before beginning

Performance Gain:

Smooth drivetrain

Complementary Modification:

Replace bolts for flex-disc

In BMW Z3 models, the driveshaft connects the transmission output shaft at the rear of the transmission to the rear differential. The transmission is mounted to the chassis and the rear differential is mounted to the rear sub frame. The rubber mounts that attach the engine-transmission and sub frame to the chassis have some give so that the drivetrain unit and the differential move slightly in relation to each other; the driveshaft has to have some flex to allow for this movement. For this purpose a flex-disc is used to connect the transmission to the driveshaft. 

The flex-disc 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 the vibration absorber. 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.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches. 

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability. 

Vehicle models change and evolve, as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Raise and support the rear of the vehicle on jack stands. See our tech article on jacking up your vehicle.

Remove the complete exhaust system. See our tech article on exhaust system removing. 

The driveshaft flex-disc (green arrow) is used to connect the transmission to the driveshaft.
Figure 1

The driveshaft flex-disc (green arrow) 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 the vibration absorber. 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 Giubo.

Working at the transmission mount bracket, remove the18mm vibration absorber fastener, then remove the absorber from the bracket (green arrow).
Figure 2

Working at the transmission mount bracket, remove the18mm vibration absorber fastener, then remove the absorber from the bracket (green arrow).

The green arrows point to the orientation indicator on the flex-disc.
Figure 3

The green arrows point to the orientation indicator on the flex-disc. Before removing note the position and be sure to install replacement flex-disc with arrows in same direction. The arrows should point toward the mounting flanges as shown in this photo.

Working at transmission, remove six 16mm driveshaft flex-disc fasteners.
Figure 4

Working at transmission, remove six 16mm driveshaft flex-disc fasteners. The green arrows point to the four visible fasteners, there are two more hidden behind the flange. Remove all six.

Using a pry bar or large flathead screwdriver, lever driveshaft away from transmission.
Figure 5

Using a pry bar or large flathead screwdriver, lever driveshaft away from transmission. You won't need much force to do this. If it won't move, you may have left a bolt in place.

 6 Then remove the center heat shield that runs along the driveshaft tunnel.
Figure 6

6 Then remove the center heat shield that runs along the driveshaft tunnel. Working at the center tunnel heat shield, remove the six 10mm speed nuts (green arrows). Then remove the heat shield from the vehicle. Be careful not to bend or tweak it. It can come in contact with the driveshaft if deformed.

Working at the driveshaft support bearing, remove the two 13mm nuts.
Figure 7

Working at the driveshaft support bearing, remove the two 13mm nuts. Then lower the driveshaft and pull it away from the transmission.

Remove the flex-disc from the driveshaft.
Figure 8

Remove the flex-disc from the driveshaft. 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. Then install center support bearing nuts finger tight. Then install driveshaft flex-disc to transmission and tighten fasteners. Then tighten driveshaft flex-disc to driveshaft fasteners. Once flex-disc is tight, preload center bearing to about 1mm toward transmission and tighten the nuts. Finally, install any items you removed to improve access.


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Page last updated: Fri 12/9/2016 03:05:34 AM