Inspect your driveshaft flex discs - Mercedes-Benz Forum
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#1 (permalink) Old 01-30-2009, 10:21 PM
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Exclamation Inspect your driveshaft flex discs

I started getting a weird vibration at highway speeds only if i put load on the engine. After inspecting the under the car I found that my flex disc had pieces of it missing and was cracked. This is what my flex disc looked like at 122k miles. The other one will be replaced soon since it has some small cracks in it.
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#2 (permalink) Old 01-30-2009, 11:17 PM
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I replaced mine in much better shape at 230,000. Don't know if it was original, but most likely it was.
Beginning signs of deterioration are hard to notice for untrained eye. I noticed that distances between the bolts were not even on both sides.
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#3 (permalink) Old 01-31-2009, 01:14 AM
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Hey, marinel. Long time no "see". Hope all has been well, glad you caught that before it completely let go.

Were you able to salvage it with a repair kit or did you have to buy a whole new one? I plan on checking mine when I do the diff fluid and trans mount, and have already priced them. I was surprised at the cost for what they are, several times the cost of a U-joint but no visible reason they should be.

Take care and enjoy the ride,
Greg

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#4 (permalink) Old 01-31-2009, 09:31 AM
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Flex disks are one of the checks to be done on an A/B service. Here's an example of why those services need to be done by someone.

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#5 (permalink) Old 01-31-2009, 10:03 AM
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I know that the disc has something to do with the drive shaft. What is it's purpose and where exactly is it located. see a ton of these on ebay, but never knew what they were. sure they are junk on there though.
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#6 (permalink) Old 01-31-2009, 10:17 AM
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Those are MB solution for shaky U-joints. There is one between transmission and drive shaft and the other on the differential end.
There is big choice of them with price difference going in 2-fold,. I bought the OEM replacement what was the cheaper year ago
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#7 (permalink) Old 01-31-2009, 10:21 AM
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There are two of them. One is at the back of the transmission, the other is at the front of the rear differential.

These isolate vibration from the drivetrain. They act something like a universal joint, but allow only a very small deflection from straight (just over one degree, if I recall correctly).

The front is usually the one that is in worse shape. Also, if the front lets loose on the highway, your SRS system will most likely be fully activated (all airbags and belt tensioners will fire).

There is also a u-joint in the center of the driveshaft.
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#8 (permalink) Old 01-31-2009, 10:24 AM
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Originally Posted by meooem1 View Post
I know that the disc has something to do with the drive shaft. What is it's purpose and where exactly is it located. see a ton of these on ebay, but never knew what they were. sure they are junk on there though.
Hey, meooem1. Flex discs are just another way of transmitting torque through a gentle bend. Thre more common way is through the use of U-joints. Same idea, only a different way of executing it.

Re ebay, I'd tend to agree. Doubtless there are legitimate sellers of quality goods on ebay, but if the price is "too good to be true" you know what you're going to get, just like the guy on the corner with the $100 Rolex watches.

Generally speaking, I'd never buy anything on ebay that is "mission critical" unless I had other knowledge as to the veracity of the seller AND the quality of the part.

And Len is 100% correct, it is fine to DIY the A and B services, but they absolutely have to be done. Simply because we jokingly refer to them as "glorified oil changes" does not mean the checklist can be ignored.

Take care and enjoy the ride,
Greg

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#9 (permalink) Old 01-31-2009, 11:00 AM
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Well. My local stealer performed full safety inspection without removing belly pans.
You think he took a look on the disks?
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#10 (permalink) Old 01-31-2009, 11:10 AM
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Originally Posted by Kajtek1 View Post
Well. My local stealer performed full safety inspection without removing belly pans.
You think he took a look on the disks?
Well, we know he didn't, but that was that freebie one, right?

I guess I'm assuming(!) that when they are paid to do an A or B service (as opposed to a free and somewhat nebulous safety inspection) they actually run the checklists.

I've always been wary of those "free inspection" things that come in the mail, not only from dealers but all manner of shops. I have this hope that at least some of them are legitimate.

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