Quote:
Originally Posted by Frank Reiner
os:
Three considerations:
1) The length of the rear section > the same.
2) The length of the front section > different, due to engine length difference.
3) Flex disc bolt circle diameter > different, the diesels use a smaller disc.
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Quote:
Originally Posted by oilslick
I have searched Pelican and other parts vendors for flex discs for an '87 SDL and for a '91 560 SEL and I keep finding the same part number for both cars. I was thinking it was just negligence on a vendor's part, but three different vendors show that the flex discs for the SDL and SEL in the w126 ('81-'91) use the same disc. What am I missing here? If the flex discs are the same then wouldn't the bolt circle diameters be compatible? 🤔
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After checking the FSM on this matter, I stand corrected to this extent:
The flex discs for the W126.125 (300SDL) MY 1986-87 are the larger ones with a bolt circle diameter of 110mm. Hence, the rear section of a 420/560SEL driveline would interchange with the one in the 300SDL.