Replaced Rear Driveline. Still Vibrating.

MarkoSrb · Apr 28, 2020

It is very possible that front cv joint making the problem

Naterb8ter · Apr 28, 2020

MarkoSrb said:
It holds propshaft in place,if you go under you can try to shake propshaft,it should be thight.I am sorry for bad english,i cannot explain better but it is possible that propshaft makes vibrations when accelerate

Thanks for the reply Mark. Correct me if I’m wrong but shouldn’t the new prop shaft have some play because of the rubber around the center bearing?

Xctro · Apr 29, 2020

UPDATE:

After about 250KM, the vibration is way less now.
This is after the automatic transmission flushing, I did change 13L of ATF.
I am thinking that the converter has a problem, and that won't last long before it will start to "shake" again.

It was only 30000km since last flushing.

Odessa · Apr 29, 2020

test torque converter like Alex did in the final pages of big bad mud tyres. Try and mount a gutter and certain revs and see if normal

Xctro · Apr 29, 2020

Odessa said:
test torque converter like Alex did in the final pages of big bad mud tyres. Try and mount a gutter and certain revs and see if normal

Didn't find that page in that thread.
Can you explain?

schootsie · Apr 30, 2020

If the tailshaft was a cheap knock off (Ebay?) then that is almost certainly the problem. If it was a genuine VW part then I have no helpful suggestions, sorry.

redbarron55 · May 6, 2020

If the driveshaft was rebuilt it may not have been put back together properly and the phasing is incorrect.
The orientation of the joints should be perfectly aligned so that the velocity changes as they flex during rotation cancels each other. If the splines are off then they cannot match correctly.
An extreme example is when someone modified a truck to jack it up and they aim the rear end up to reduce the angle of the U joint instead of keeping the same angle as the output shaft of the transmission. The result is a phase mismatch and torsional vibration in the extreme. Sometimes you can actually see the surge at lower speeds each time the driveshaft rotates.

Odessa · May 7, 2020

Xctro said:
Didn't find that page in that thread.
Can you explain?

My sincere apologies i must have been re-living an SMS from Alex as i remember him showing a torque test or sorts when his problem arose

Xctro · May 7, 2020

Odessa said:
My sincere apologies i must have been re-living an SMS from Alex as i remember him showing a torque test or sorts when his problem arose

And how did he do that?

Odessa · May 7, 2020

mounting a small obstacle around 15-20cm high head on or straight on. Gentle on the accelerator monitoring RPM's until you get the the value such that once the front tyres have climbed the obstacle you know at what RPM's the vehicle climbed over. Now compare to another vehicle same as yours

Xctro · May 19, 2020

Odessa said:
mounting a small obstacle around 15-20cm high head on or straight on. Gentle on the accelerator monitoring RPM's until you get the the value such that once the front tyres have climbed the obstacle you know at what RPM's the vehicle climbed over. Now compare to another vehicle same as yours

I did this yesterday, and compared to another Touareg R5. They where suprisingly identical rpm match, considering not same tire specs.
This test does not test the "lock up" function in the converter, witch is the main cause of vibration under load..

Altough it seems like my injectors are bad. Very much difference in injected quantity, hope this is the injectors, and not some other underlaying fault making the injectors struggeling. And guiding me in the wrong way. plan is to take an compression test before injectors swap.

Replaced Rear Driveline. Still Vibrating.

MarkoSrb

Naterb8ter

Xctro

Odessa

Xctro

schootsie

redbarron55

Odessa

Xctro

Odessa

Xctro

Top Contributors this Month

Recommended Communities