95 E320 Front Flex Disc
 

Why are there 6 bolt holes in the disc when there are only 3 on the driveshaft and 3 on the transmission yoke? What are the extra 3 for and do they need to have bolts thru them? What am I missing?

Each hole gets a fastener and the yokes are "staggered" to insure that the bolt either goes through the tranny output shaft yoke and the disc or the driveshaft yoke and the flex disc.

Thanks Jim. This is a Lemforder disc and I'm wondering if there's a front and back for correct installation. No instructions came with the disc. Also, 3 bolts are slightly longer and a different color (light gray) than the other 3 with a chrome type finish.

Thanks Gerry. Attached are pics of the disc I removed, which may be orig to the car (260k mi). Is the "NR" lettering at the top of the 2nd image for orientation?

Attached are pics of new Lemforder disc and accompanying bolts. Reverse side of disc has no markings.

to make it easier to understand.

all bolt heads are to be facing the rear of the car - this is the only way you are ever going to be able to use tools on them and the nuts on the transmission side.

the disc metal inserts have projecting metal bosses, make sure those bosses go into the "pockets" in the drive flanges - either on the trans yoke or on the driveshaft.

the washers are placed where the bolt head or nut directly contacts the rubber flex disc metal insert meaning that 3 washers are used under the bolt heads and 3 are used under the nuts. It will be a sort of wrestling match because the nuts provided with the kit are locking type, meaning that the last thread in the nut is oval shaped which causes it to lock onto the bolt threads.

put some axle grease in the little centering bush on the driveshaft as the original must be dried out and useless (best if you can somehow clean the old stuff - quite hard to do honestly - but grease is required)

Thanks Solfiquar. Doubt that I could have found this kind of detail anywhere.

you are welcome.

btw forgot to add.

your disc is not a directional disc meaning it can be used either way and either on the front or the rear.

the directional type disc has the words "deise seite zur gelenkw" - meaning this side towards d/shaft or the word vorne - meaning front (of car) - such discs are usually the "cushion" type discs where it is softer on the reverse side of normal drive - this prevents the downshift shocks at low speed.

it is however a good idea to place the disc in the exact same place as it came out - meaning the NR embossing on the new disc should go back to the same place as the old one was relative to the flanges. (some old style discs came with numbers on them and it was advised to correctly orient the numbers)

Disc is in and car is running perfectly (low and high speeds). Thanks for everyone's replies. Removing the transmission mount was very helpful. Whoever changed the disc last time plastered some type of white paste that hardened all over the bolts and inside the fittings on the disc. It took well over the prescribed torque of 45nm (more like 80+) to break them loose. I did mark the relationship of the shaft and transmission yokes to each other before prying the disc out of the yokes. Again, the white paste seemed to cement the disc fittings inside the yokes.
As shown above, the new disc didn't have the same markings as the old one.