http://www.peachparts.com/shopforum/3096212-post14.html

4matic gas out and diesel in

1) bought the oil pan from Germany, the gas pan/rear is to short by say 1"
was going to cut and re weld but found the right one.

2) the oil pump is different, the gas bolts in but the sprocket is off so I put 
the rear half of the gas pump on the diesel pump and welded in the mismatch areas 
and sanded the mating surfaces smooth,

the oil pump you need is 6301802101 it's about 500 to 600 to get it from Europe.

3) the tach pick up is different causing a problem with the air conditioning system 
and tach indication, one is DC the other is AC one picks up 3 tabs on fly wheel the 
other on the ring gear. So we are making a puck up on the front for the gas pick up 3 tabs.

4) key for the vacuum shut off is just adding parts.

5) glow plugs not hard need to add power wire ect use ignition power to run system

6) motor mounts off gas bolt on 603 and all bolts back in car with original trans and torque converter.

7) engine wires, no electronics just base Idle
re use wires out of original harness for temps and pressure

8) you need to use the diesel radiator for correct hose hookups it bolts in, and don't forget the oil cooler.
The turbo diesel 4 matic in Europe is a 124.333 engine is 603.963
non turbo engine 603.913.

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 # From: Bruce Caruthers <bkc-benzlist2--at--dreamfire--dot--com>
 # To: diesel-benz--at--Digest--dot--net
 # Date: Wed, 22 May 2013 15:07:03 -0700
 # Subject: [db] someone did a 4matic 124 diesel conversion
 # Apparently they did sell 4matic 603 diesels in Europe.  So the right parts are available.  
The guy below mentions doing just that.
 # 
 http://www.peachparts.com/shopforum/3096212-post14.html
 # 
 # Not that I should probably feed the obsessions here.  :)
 # -bkc # Lynnwood, WA
 # (his)  '76 MB 240D [W115.117/616.916] (acquired 11Jun76)
 # (ours) '87 MB 300D Turbo [W124.133/603.960] (acquired 21Apr12)
 # (ours) '91 MB 300SL-24 [R129.061/M104.981] (acquired 25May12,
 #         diesel engine swap planned from wrecked W124 OM602)
 # (RIP)  '93 MB 300D 2.5 Turbo [W124.128/602.962] (totaled 28Mar12)
 # (hers) '92 Toyota Celica GT (SOLD!!)