Very good info. It is fun to finally get an answer to the puzzle.
Both my 240's (80 and 81) do not have engine shocks, but do have the rear engine mount. Both have standard trannys.
My old 300D, 1977 model, had one on the passenger side. Auto tranny.
The rear engine mount on the Squash has turned to dark Jello. I am supposed to have one on the way.....

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

According to the shop manual, early W123 300D engines had one shock fastened to the right aluminum engine bearer, while later ones used one on each side, fastened to a bracket on the oil pan..

Happy Motoring, Mark

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DrDKW

Well, of course their is one possiblility I've not mentioned so far and that is that my motor could possibly be shot. 220K on a rebuild. Smokes badly and lot's of blowby. I guess it's possible that it's just too far gone to be smoothe any more.

- Peter.

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2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S

Unless it's not running on all four , I'd look elsewhere for the vibration problem. In the case of my automatic 240D, the engine shock is a possible suspect as I noticed it was binding a bit when I was changing the motor mounts. Also, while the old mounts didn't look that bad, one of them was twisted, as though there was somehing misaligned. So it's possible something around the front crossmember got slightly bent when the PO's kid had a fender-bender several years ago, and I may never get rid of all the vibration. So far, raising the idle speed a bit has helped, and the vibration goes away above idle, so for now I can live with it.

Happy Motoring, Mark

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DrDKW