Scoping out an engine donor for my 240D.

From 1978-1985, yes.

you'll have to change the motor mount arms and the oil filter housing though if your getting it from a sd

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1981 300SD 512k OM603

Plan is to tow the donor, pull what's needed and fab required supports if the engine looks good. Thanks for the tip.

Anyone ever transplant a 617 into a 240D by not shifting the tranny back and replacing the viscous coupled fan w/ an electric?

No, that would be a major pain in the A$$ and require much more custom fabrication, such as motor mount arms. Even then I'm not sure it would work.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

If you just swapped the SD's motor and trans into the 240 you'll have a 300D. MB did it, doubt they changed that much.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200