prop vibration at 80mph

[adem.csl]

hi guys ive recently had my clutch and flywheel changed due to suspected clutch slip and vibration.removal of clutch i found the flywheel was gone but had new clutch.i replaced clutch and flywheel regardless.the problem i have is that ive noticed a vibration/humming noise starts at 80mph to 100mph from between the seats mid tunnel area sounds like prop centre bearing.bearing in mind bmw have only just replaced the diff floor pan and fitted a new diff.what im wondering is could this vibration be due to the butyle tape that sticks the centre bearing to the body?or has anyone had to change the bearing.this noise stops completely at 79.soon as you hit 80 you notice it straight away.
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[uncle benz]

My apprentice, Jamie, has just replaced the centre bearing on his e46 m3. Much to my annoyance he didn't mark the two halves of the prop before he split it. Even more to my annoyance he moved the thing while my fingers were in the uj, but thats another matter... We looked for some witness marks and took a best guess of which spline it was on, but it now has exactly the fault you describe - 80mph on the nose and you can hear/feel it.

[NZ_M3]

Prop shafts are balanced and aligned from the factory ... yours is out of alignment.

[adem.csl]

Oh shit that can only mean bmw have split it while working on rear end.I haven't and wouldn't split the shaft without first marking it.thanx I will look See if It's been messed wid.god thinkin about it that could be only reason for the vibration.ive been soo happy just gettin the car back after 4 months at bmw i never noticed till recently.what to do now?

[mattCSLnut]

Originally Posted by adem.csl

Oh shit that can only mean bmw have split it while working on rear end.I haven't and wouldn't split the shaft without first marking it.thanx I will look See if It's been messed wid.god thinkin about it that could be only reason for the vibration.ive been soo happy just gettin the car back after 4 months at bmw i never noticed till recently.what to do now?

Errrm go back to BMW and ask them to balance your prop shaft ? Simples

[Steve B]

School boy error there by someone... Easily done

[adem.csl]

Originally Posted by mattCSLnut

Errrm go back to BMW and ask them to balance your prop shaft ? Simples

are you mad?my car is now out of warranty and i didnt notice the vibration till some months after i got it back.they also have had to pay over11k on warranty even though its a 10k limit.long story and they also has to buy me a 4500£ new front bumper i have at home cos i refuse to take the car to them.

[shimmy]

Originally Posted by adem.csl

are you mad?my car is now out of warranty and i didnt notice the vibration till some months after i got it back.they also have had to pay over11k on warranty even though its a 10k limit.long story and they also has to buy me a 4500£ new front bumper i have at home cos i refuse to take the car to them.

Irrelevant, take it back.

Where did the 10k limit come from?

[adem.csl]

Originally Posted by uncle benz

My apprentice, Jamie, has just replaced the centre bearingk on his e46 m3. Much to my annoyance he didn't mark the two halves of the prop before he split it. Even more to my annoyance he moved the thing while my fingers were in the uj, but thats another matter... We looked for some witness marks and took a best guess of which spline it was on, but it now has exactly the fault you describe - 80mph on the nose and you can hear/feel it.

don't know How true it is but I'm gonna try this.bmw said that to realign the prop both uj either side centre mount must mirror each other or face same way as each other.meaning they need to match

[uncle benz]

Originally Posted by adem.csl

don't know How true it is but I'm gonna try this.bmw said that to realign the prop both uj either side centre mount must mirror each other or face same way as each other.meaning they need to match

There is only one uj. The diff end is a cv joint, the gearbox end rubber guibo joint. They speak with forked tongue.