BMW e39 - Cardan Shaft Vibrations - Realigning + Static Top Speed Test

The whole car vibrates from 110 kph and above due to misbalanced cardan shaft. Cause - wrong position of two cardan shaft halves. At the previous "flywheel and clutch change" video the center support bearing also was changed, but after putting the cardan shaft out of the car as a whole, it fell apart in its 2 halves ON ITS OWN, without the relative position of the halves being marked. The screw holding the shaft halves together unscrewed itself in the past and remained so. After it fell apart I assembled the two halves at a random positon. Unfortunately it didn't worked out and now I havve to reposition the shaft to a original. The correct position was taken from the video • BMW e39 - Dual to Sing... .
Content of this video:
- location of the vibration position at the shaft,
- disassembling the cardan shaft's CV Joint,
- disassembling the cardan shaft at the center support bearing,
- repositioning the shaft to the old original position,
- assembling the exhaust with regard to proper position of its silentblocks (and why to do this),
- validiation of the repair - testing the drive shaft at 130 kph static,
- static max speed test to the rev. limit.
- engine and turbo sound without silencer :)
No parts required.
Tools:
- jack up,
- two 6t jack stands for tsupporting the car,
- 4 wooden chcks for blocking the front wheels,
- 13 mm socket and ratchet for exhaust and heat shield dismount,
- 16 mm wrench for the CV Joint,
- hammer for beating the CV Joint screws out,
- 18 mm wrench for the cardan shaft halves dismount,
- thread glue,
- picture with proper alignined shaft
Videos before on BMW e39:
Front brake disc swap inc side stroke measuring:
• BMW e39 - Front Brake ...
Clutch, flywheel, center support bearing change:
• BMW e39 - Dual to Sing...
Stripped passengers wiper arm repair:
• BMW e39 - Windshield W...
Rear right door blocked inside and outside - opening:
• BMW e39 - Rear Right D...
Links to the tools:
Ratchet and sockets set small HOBBY
www.alza.sk/hobby/sthor-gola-...
Ratchet and sockets set small PROFI
www.alza.sk/hobby/narex-kombi...
Ratchet, sockets, wrenches incl. 16 and 18mm PROFI
www.alza.sk/hobby/makita-e-10...
Wrenches set only incl. 16 and 18 mm
www.alza.sk/hobby/extol-premi...
Jack up 2,5t (I have 2t, it works too)
www.alza.sk/auto/atx-pojazdny...
Thread glue
www.alza.sk/hobby/special-upe...
Hammer
www.alza.sk/hobby/kreator-krt...
If you buy some tools, you will support this channel. They are not exactly those I used in this video, because my tools are much older (except for the thread glue), but they will work just good. This is a trusted shop. Thank you.
Enjoy!

[@petarpetrovic257]

How did you balance it?

[@REBUILDLab]

I didn't, it was balanced, but wasn't assembled in a correct position as it fell apart at disassembling stage, then it was assembled randomly which caused terrible vibrations

[@petarpetrovic257]

@@REBUILDLab i think i have same issue. How did you know what are the markings? Are markings for correct position from factory or some other balancing job prior to this?

[@REBUILDLab]

@@petarpetrovic257 unfortunatelly don't think so. I did only approximatelly where the position was because I had filmed the disassembling process. Only thing you could do is to turn the shaft f.e. 90deg. and look if vibrations changed or not, then repear the process till you find a position with a satisfying result. Another thing is to buy a new balanced shaft, shouldn't be that much expensive.