The Death of a Flex Disc ... did I kill my 240D? - PeachParts Mercedes-Benz Forum

Deltacom · #1 05-21-2009, 10:01 AM

Quote:

Originally Posted by BodhiBenz1987

But here's the kicker (you knew it was coming, right?). When I was cleaning up a I picked up one of the old bolts, which still had the washer on it ... and realized I put the washer on the wrong side of every single bolt (i.e., I put it under the nut. Why? I have no idea). I doubt that will lead to immediate catastrophic failure, but the washers go under the bolt heads for a reason, and I have to go back and re-do all 12 bolts. It makes me so mad, because if I'd stopped and thought about it, logic alone would compel me to put the washer under the bolt head. And I was so careful about everything else. Oh well, it could be worse ... at least it doesn't look like this anymore ...

Quote:

Originally Posted by rs899

If the washers DO go under the bolt heads, I am at a loss to understand why. I probably have all mine on the way you did it. I would say the "normal" way would be to put the washers under the nuts anyway. I wouldn't change a thing or worry about it, especially if you used nyloc nuts.

Congratulations on a well presented job, nice write and fantastic pics on step-by-step procedures. Well done!!

Just one point to clarify regarding the washers on the bolts. As you can see from your picture before disassembly the washer either go under the bolt if the bolt goes first through the flex disk to screw on to the lobe of the shaft or axle/tranny.
Conversely, the washer goes under the nut when the bolt goes first through the lobe of the shaft or axle/tranny. The washer always goes resting on the flex disk and not on the lobe of the shaft or axle/tranny.

Here are pics of your flex/shaft before dismantling and one of my own flex that I need to replace soon (thanks to your efforts, write and pics it will be a lot easier for me). BTW, there is 6 grams of pertinent grease to go on the centering sleeves.

BodhiBenz1987 · #2 05-21-2009, 01:55 PM

Quote:

Originally Posted by Deltacom

Congratulations on a well presented job, nice write and fantastic pics on step-by-step procedures. Well done!!

Just one point to clarify regarding the washers on the bolts. As you can see from your picture before disassembly the washer either go under the bolt if the bolt goes first through the flex disk to screw on to the lobe of the shaft or axle/tranny.
Conversely, the washer goes under the nut when the bolt goes first through the lobe of the shaft or axle/tranny. The washer always goes resting on the flex disk and not on the lobe of the shaft or axle/tranny.

Here are pics of your flex/shaft before dismantling and one of my own flex that I need to replace soon (thanks to your efforts, write and pics it will be a lot easier for me). BTW, there is 6 grams of pertinent grease to go on the centering sleeves.

Thanks for pointing that out ... I guess I only got if half wrong.

Now I have to decide whether to go in there and change the six that are on wrong. rs899 ... I know the nuts are self-locking, but I don't think they were nyloc. Can they be removed and refastened without losing their locking function?

rs899 · #3 05-21-2009, 02:16 PM

As long as the "self locking" feature still works, you should be able to re-use them. You can use some liquid threadlocker if need be. Maybe I'm not such a purist as Deltacom, but I would not remove and reconfigure those bolts. I say leave' em alone and find something more important to work on.

As long as those bolts are torqued down well and the nuts don't spin off, nothing bad is ever going to happen. All the side load is in the inserts.

Besides, just how many of these discs were put on by high school dropouts at Meineke mufflers over the years?

Rick