So I have a pair of Genuine flex discs on hand that I bought for my '79. This was before I got the '85.

The rear flex disc on the '85 needs replacing sooner. It has a nice crack in it.

I was planning to use the ones I had on hand, but was recently looking around and noticed that the part number is different for the '85 flex disc.

Part number for the '79 flex disc:

123-410-00-15

Part number for the '85 flex disc:

126-410-02-15


For two reasons, if possible, I'd like to use the first set of discs. 1) I have them already and 2) There is a noticeable price difference between these two parts; the latter part is twice as expensive for the Genuine item.

Does anyone know whether there's actually a difference? Is it like the motor mounts on the W123 where the N/A and Turbo have different part numbers, but the fit is the same?

Now I do I know that with the mounts there's a different in the shore hardness of the rubber, but is there any significant difference between the above flex discs?

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1979 300D 040 Black on Black - 1985 300D Maaco job (sadly sprayed over 199 Black Pearl Metallic) on Palamino

http://i.imgur.com/LslW733.jpg

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Hi there, just so I understand: The 1979 is a W123 N/A diesel? and the 85 is a turbo diesel? If I am correct in this assumption, yes they are different part numbers, and yes they are significantly different parts.

I recently went through this "education" when getting the drive line of my 1982 Euro N/A rebuilt. I'm keeping the manual transmission from that car and hence the drive line as well to install in the USA spec 300TD with the turbo engine. The parts, when you have them next to each other even look different. And if you try to bend the later ones intended for turbo, they are much stiffer. The driveline people told me, that there is more fiber in the newer version discs and that it is more densely wound. So, while I could use the one's spec'd for the 82 non-turbo (they will fit) but it wouldn't be advisable, as they may not hold up to the torque stress of the turbo engine output very well. The draw back, is that I might have more "feedback" from the drivetrain due to the stiffer discs.

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1983 W123 300TD US spec Turbo engine, with Euro bumpers and manual climate control, and manual transmission.

Please look on the discs and see if you can identify who they were made by and what Country.

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84 300D, 82 Volvo 244Gl Diesel

You are correct in that.

So while they might fit, the suggestion is that the latter part number for the turbo cars is for a stronger/more durable part. Sounds reminiscent of the situation with the motor mounts; i.e. the mounts all fit the different cars but the turbo mounts are stiffer. So while you can consider going backwards and using turbo mounts on your N/A car (which I've done) you may not want to use N/A mounts on your turbo car...

The Genuine ones that I bought for the '79? If that's what you meant, then yes I can check that when I get home this evening.

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1979 300D 040 Black on Black - 1985 300D Maaco job (sadly sprayed over 199 Black Pearl Metallic) on Palamino

http://i.imgur.com/LslW733.jpg

The Baja Arizona Oil Burners Send a message if you'd like to join the fun
Left to Right - UberWasser, Iridium, Stuttgart-->Seattle,, mannys9130

Visit the W123 page on iFixit for over 70 helpful DIY guides!

That is the conclusion I came to as well, safe to go backward with the "improved" part, but not the other way around. Sorry, to give the news, cause I am well aware of the difference in price...ouch!

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1983 W123 300TD US spec Turbo engine, with Euro bumpers and manual climate control, and manual transmission.