Originally Posted by Smallblock454 (Post 634901)

My box was in the workshop.



Got new DMF, clutch and IMS bearing.



Since than i have engine vibrations starting at around 2 to 2.5 rpm upwards. And they are getting worse.



Yesterday when cold starting the car i've got a rattle noise for 2 to 3 seconds. Sound like a timing chain was banging against the engine housing. At first sight to me that means a problem with the chain tensioners.



Is it possible that that damn workshop has interchanged the 3 chain tensioners (so they are not in there original position) and that is causing the engine to vibrate at higher rpms?



Thanks, Markus

Originally Posted by Smallblock454 (Post 634901)

My box was in the workshop.



Got new DMF, clutch and IMS bearing.



Since than i have engine vibrations starting at around 2 to 2.5 rpm upwards. And they are getting worse.



Yesterday when cold starting the car i've got a rattle noise for 2 to 3 seconds. Sound like a timing chain was banging against the engine housing. At first sight to me that means a problem with the chain tensioners.



Is it possible that that damn workshop has interchanged the 3 chain tensioners (so they are not in there original position) and that is causing the engine to vibrate at higher rpms?



Thanks, Markus

Originally Posted by paulofto (Post 634907)

DMF = Dual Mass Flywheel

Smallblock, I’d get that thing back to the shop that did the work ASAFP.

ASAFP = As Soon As Fricken Possible

Originally Posted by paulofto (Post 634907)

DMF = Dual Mass Flywheel

Smallblock, I’d get that thing back to the shop that did the work ASAFP.

ASAFP = As Soon As Fricken Possible

Originally Posted by maytag (Post 634908)

You ask if the shop interchanged the tensioners, but replacing tensioners isn't on your list of work performed. [emoji848] I'm somewhat confused by that. Did they replace tensioners?

I'd focus on what they changed/ touched.

Why did you replace the dmf? What were you trying to solve? Was it replaced with an oem unit? Was it new or used?

Ike asks a very good question: clutch pedal in or out, any change?

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Originally Posted by Smallblock454 (Post 634911)

I would, but i have no more trust in that workshop. My car was there 3 times now and after the 1 and 2 workshop visit there were a lot of other things wrong with the car that were not wrong before.



They have already changed DMF, clutch, clutch basket and so on 2 times.



Vibration is still there and getting worse.



And the best is that they say there is no vibration. :mad:







Clutch and DMF were worn.



Tensioners weren't on the list. They talked me into changing the IMSB, so in the end i agreed. The've used an open roller bearing. To change the ISMB they needed to lock the chains and remove the tensioners.



Because the engine was running absolutely smooth an without any vibrations before, there must be something wrong. And i never ha a chain rattle before.



So i wonder if they might "intermixed" (put the 3 tensioner in the wrong place) the chain tensioners. I don't know if it's technically possible, but to my knowlegde the length and tension is a little bit different. And i don't know if that can cause the vibrations at 2 to 2.5k up.



And i never had a noise from the chains before, when starting the car.



Regards, Markus

Originally Posted by JFP in PA (Post 634951)

Their removal releases the chains so that the IMS shaft centers in the case opening rather than being pulled to one side by the chains.

Originally Posted by ike84 (Post 634959)

That's interesting. One thing I have read about IMS bearing failure is that some shafts (and hence the bearing) seem to be off centered and that this eccentricity leads to bearing failure. Do you think that removing the chain tensioners before IMSB install and then reinstalling at the end eliminates this problem?

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