1990 350SDL receiving engine transplant from 1987 300SDL - Questions... - Mercedes-Benz Forum
 
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post #1 of 8 (permalink) Old 06-01-2011, 08:37 PM Thread Starter
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Date registered: Jul 2008
Vehicle: 87 300SDL, 82 300SD, 81 300D, 81 240D, 82 300SD, 87 300SDL#2, 87 300TD, 94 S350D, 85 300D, 90 350SDL
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1990 350SDL receiving engine transplant from 1987 300SDL - Questions...

Hey guys, I've decided to replace the 3.5L engine in my 350SDL with a very low mileage 3.0L OM603 out of one of my 300SDL's. I have a few questions. I'm planning on keeping the same transmission in the 350SDL. Any issues with mating the 3.0L to the 3.5L transmission? I realize they are the same common block, just making sure everything will be the same. I did notice that the engine mounts are listed as different between the 3.0L and the 3.5L in the same W126 chassis. In the 350SDL, are the different engine mounts based on the cradle side, or the engine side? In other words, can I transplant the engine mounts from the 300SDL along with the engine? Or do I use the 350SDL engine mounts with the 3.0L?

Also, does anyone know if there are any other differences that I will need to prepare for in this swap? I look to do it all in one day. Thanks in advance for the help all.
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post #2 of 8 (permalink) Old 06-20-2011, 08:08 AM Thread Starter
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Date registered: Jul 2008
Vehicle: 87 300SDL, 82 300SD, 81 300D, 81 240D, 82 300SD, 87 300SDL#2, 87 300TD, 94 S350D, 85 300D, 90 350SDL
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Well, work has started on this. I decided to include a couple of other projects to run in tandem with it while I had the help of a real good friend.

One question, I still need to know about re-pinning the harness on the rear of the IP. The 300SDL a 3 wire harness, and the 350SDL has a 4 wire harness. Any ideas? Or should I just use a multimeter to figure it out?

Thanks.
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Last edited by jusme; 07-02-2011 at 06:36 PM.
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post #3 of 8 (permalink) Old 06-20-2011, 08:51 AM
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I'll be curious to hear what you find, I'll be doing a similar swap in the not so distant future..!


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post #4 of 8 (permalink) Old 06-22-2011, 09:50 PM Thread Starter
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Date registered: Jul 2008
Vehicle: 87 300SDL, 82 300SD, 81 300D, 81 240D, 82 300SD, 87 300SDL#2, 87 300TD, 94 S350D, 85 300D, 90 350SDL
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OK, I decided to put a replacement engine into a 300SDL because I have an offer on it. So, before I put the engine in the 350SDL for myself, I hopefully can make a few bucks on this car since I'm currently between jobs. Anyway, the car had no real issues when the engine was removed, but with the replacement engine installed, the shifter is WAY off. When the old engine was being removed, we did hangup on the shifter linkage. Obviously, enough to bend it somehow. The rod underneath looks straight, so I'm assuming it's bent somewhere above closer to the cabin area. Any ideas what would first distort in the shift linkage when the shift rod is pulled forward? The only other issue I can say exists is the glow plug light is not working. I'll need to figure that out. I left the relay in the car, and used the GP harness attached to the engine. So, I'm thinking it's somewhere on the engine side since that's the new portion as far as the car is concerned. The engine harness was also left in the car. Oh, and the headlights seem to pulse like a bad alternator, or a bad ground somewhere.

It's late, and I'm rambling. I'll address these tomorrow. But I did need a possible lead on the shift linkage. As to where the weakest link is that would have been compromised when the shift rod got pulled forward unnaturally.

Last edited by jusme; 06-22-2011 at 09:54 PM.
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post #5 of 8 (permalink) Old 06-23-2011, 07:45 AM
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sounds like you bent the arm under the actual shifter. looking @ the transmission it should be Pretty easy to tell if that's tweaked,but getting a good look @ the upper part of the linkage on the car is a bit more difficult.

in the past I'd forgotten to undo that clip, but never yanked hard enough to tweak it out :-/


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post #6 of 8 (permalink) Old 06-23-2011, 08:17 AM Thread Starter
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Date registered: Jul 2008
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The clip was removed, and the rod was pulled free, but while the engine/trans was being slid forward, the end of the rod caught on something on the trans and pulled it forward too far. What is the easiest path to that rod under the shifter you spoke of? Under the car? Or go in from the top?
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post #7 of 8 (permalink) Old 07-02-2011, 06:45 PM Thread Starter
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Quote:
Originally Posted by jhodg5ck View Post
sounds like you bent the arm under the actual shifter. looking @ the transmission it should be Pretty easy to tell if that's tweaked,but getting a good look @ the upper part of the linkage on the car is a bit more difficult.

in the past I'd forgotten to undo that clip, but never yanked hard enough to tweak it out :-/
OK, what was bent was that flat piece of metal that attaches to the shifter. Rather than screw with that trying to bend it back, and guess with trial and error, I realized there was plenty of room under there. So, I just removed the linkage rod, removed the stop nut at the end of the threads, and took a die and cut about another inch or so of new threads further past where the factory threads stopped. Worked like a charm.


As far as the 300SDL engine swap into the 350SDL car, it's done. The things you will need off a donor 300SDL that I noticed were:

Throttle pivot in the firewall is different, so I swapped that. And you need to use the pivot rod connecting the firewall pivot to the engine, with the black ball socket.

I wanted to keep the AC system sealed, so I tied the 10P17C compressor out of the way. The mounting bolts are in different locations than the 300SDL's 10P15C, so when I pulled the engines out, I swapped over the compressor bracket.

I swapped over the alternator both because of different connectors, and the 350SDL's is higher amperage.

The 300SDL side sump pan worked fine in the 350SDL cradle. So you can keep that on rather than messing with that windage tray in the other pan.

I had to use the 300SDL serpentine belt which was slightly longer than the 350SDL belt (84.5 inches compared to 83.5 inches)

I kept the 350SDL trans in the car, and reused the 350SDL converter. I also used the 300SDL IP and turbo. They seem to work find with the 350 trans. I was initially concerned about shift points being matched to the 350 IP, but it works great.

The compressor interrupt switch on the bottom of the IP is different. The 300SDL switch is 3 pin, and the 350SDL switch is 6 pin (actually 5 pin active, the 6th pin is blank. Here's a few pics from both swaps, and some of the pieces I mentioned above...


If you run into any issues, just msg me.
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post #8 of 8 (permalink) Old 07-02-2011, 08:32 PM
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Very good info for us 350SD owners also, just in case. Later.


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