Driveshaft Center bearing noisy

[Far2002]

 

 

Noise is Now less present after some Time driving the car.

as TobyB says it may be the trans hitting the tunnel.

Flex disk and csb are ok

oil inside is miller EP 80W90 GL4

In this vidéo there is no abnormal noise on quickjack

 

[OriginalOwner]

A thought based on "trans hitting the tunnel."

 

How about the rear transmission mount, is it allowing "flopping around" of the back of the transmission ??  Is it nice and tight ??

 

Some reading about the E21 transmission mount ..... 

 

 

 

 

 

Cheers,

 

Carl

 

 

Edited May 15, 2022 by OriginalOwner

[Far2002]

I use the blunttech transmission mount and it seems to be strong 

[M3M3]

How did you change from 4spd to g245 5sp without changing the csb/driveshaft?

[Far2002]

No need to change csb and driveshaft if in good condition.

just have to cut the driveshaft on transmission side 

[M3M3]

2 hours ago, Far2002 said:

No need to change csb and driveshaft if in good condition.

just have to cut the driveshaft on transmission side 

cutting and shortening a driveshaft is a significant "change"......and a potential source of vibration.

[tech71]

At this point, a couple of pics of the fwd driveshaft and platform area would be worth a thousand sounds. Need to see what's going on.

[TobyB]

True-

a long time ago, when I had major (self- inflicted) driveshaft vibration problems,

a small camera and a recording card for my little netbook (remember those?)

showed me a bent output flange, an off- center weld, a bent flange ear,

AND a loose pinion bearing.

That wasn't fun.

Nor cheap. 

nor inspiring...

 

but I'll bet yours is easier than mine was.

t

 

[Far2002]

 

 

As you can see in this video output flange seems ok. And there is no vibration

tomorow î’ll put some Pictures 

[tech71]

Was that shiny spot on your driveshaft there before? Something clearly is or was rubbing there.

My 5 speed conversion used a 320i shift platform and tunnel mounted rear platform support.

The rubber bit sticking down from it would contact the driveshaft on decelerations and spirited shifting until I trimmed some off. Made an interesting squealing kind  of noise .

Granted, your set up is different but how much clearance is there between the DS and that shiny, new aftermarket shift rod I spy up there?

 

Edited May 17, 2022 by tech71

[Far2002]

The shiny spot was already present 

[tech71]

16 hours ago, M3M3M3 said:

cutting and shortening a driveshaft is a significant "change"......and a potential source of vibration.

Zoom in on the fwd flange, those welds and damaged flange are concerning

[Far2002]

Except the upper side of the trans the only contact spot that could be possible is on the spaghetti.

as i said it is a grindy noise not a vibration 

 

 

 

 

 

 

Edited May 17, 2022 by Far2002

[Son of Marty]

Well a few things pop out in your pictures, one thing you clutch slave is upside down, second what is that wire tied to the shift rod ? third in the picture the exhaust flange seems to be too close to the rear trans support a common problem with the IE mount, Hope this helps.
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

?

[tech71]

Shift platform brace/support upper bolt is loose,