help identify engine

I bought a very nice 1977 240d for $200 a few days ago the man claimed it had no compression in one cylinder. I found the compression to be fine but the new rebuilt injector was not outputting any fuel at all. For many reasons I am sure this is not a 240 d motor IE there is a shock mounted at front of car that should go to engine but no where to connect it to engine. The car has an oil cooler but no lines to hook up to oil cooler and I can’t find any coming from the engine that has been capped. The radiator hoses have home made tie downs too keep them away from moving parts. The man I bought it from told me it was a 230 engine from a junk yard. The only thing I can find about 230d engine could not possible be this engine. I did find a plate on the engine that reads as follows.
Original Mercedes-Benz
Tauschaggregat
Teil-nr. 61501080 illegible looks like 00 then 88
Aggregate nr. 627402
Can any one identify this engine?
Dave S