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Old 12-26-2009, 01:14 PM
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Join Date: Sep 2001
Location: Former New Jersey resident, transplanted to Atlanta
Posts: 367
1983 300SD W126 Engine Swap

Hi guys, I have a 1983 300SD that a tree fell on with a strong and flawless drivetrain...... I have an oppourtunity to purcahse a 1986 300SDL in need of an engine but with a tight body......My questin is: Will the 1983 300SD's engine swap out into the 1986 300SDL's body without any major modifications or expenses?

As always, thank you guys in advance for any input

Currently Driving
2006 E320 CDI
1999 E300 Turbo Diesl
2002 ML500
1995 E320 Station Wagon

MBs I've owned
1997 E320 Assassinated by Pine Tree
1987 300E Wife Killed Engine
1981 300D Stretch Limo Total Loss
1970 250 Coupe 212,000 mi.
1974 450sel 184,000 mi.
1974 240D 377,000 mi.
1977 300D 204, 000 mi.
1979 280se God Only Knows!
1983 240D 130,000 mi.
1972 220D 280,000 mi.
1983 300SD 244,000 mi.
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Old 12-26-2009, 01:20 PM
junqueyardjim's Avatar
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Join Date: Apr 2005
Location: Cicero, Hamilton County, Indiana about 30 miles north of downtown Indianapolis
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Anything is possible

But you must remember that the 617 diesel in your 83 is a completely different animal then the diesel in the 87. So there are modification that will have to be made. Number one the transmission in the 87 will have to go as it won't install with the 617. So, measure it twice before you cut once. Another line is, with enough money anything can be made to fit.
Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis

1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!
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Old 12-26-2009, 10:44 PM
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Join Date: May 2007
Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
Posts: 9,585
There was a thread not too far back, where the guy put a 603 (I think)
into a 123 and got the wiring worked out, and is driving it.

So I guess it is possible to go the other way. I have read where a 617 was put into a 126 SE, though a gasser.

If the DREAM is big enough, the facts dont count.

Looking in your signature, this is the second car attacked by a tree.
May a Chain saw would be a priority .

there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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Old 12-27-2009, 12:10 PM
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Location: Littlestown PA ( 6 miles south of Gettysburg)
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My guess ( and it is only a guess, as i have not done this) is that the engine/tranny will sway in fairly easily. After all that engine and tranny was offered in the 300SD. The chassis for 2 cars is the same except for the extra length in the SDL.
Use the motor mounts from the 300SD, and probably the cross member from the 300SD. You may have to play with the length of the driveshaft. I doubt that either would fit w/o modification.
You may want the rear end from the 300SD, too. Check if they have the same ratio. You might want the lower gear set ( higher numerical) if they are different. That 3.0 liter may be a little under power for the longer chassis.
1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags
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Old 12-27-2009, 01:15 PM
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Originally Posted by MS Fowler View Post
You may want the rear end from the 300SD, too. Check if they have the same ratio. You might want the lower gear set ( higher numerical) if they are different. That 3.0 liter may be a little under power for the longer chassis.
The diff from the 300SD will not fit the later W-126.........a completely different mounting configuration.

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