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  #1  
Old 11-20-2018, 11:20 AM
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Thumbs down swap 1983 380 SEC to 300 CD turbo

Information needed, NEW Member to do engine swap, 123 300 CD turbo in to 126 380 SEC

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  #2  
Old 11-20-2018, 11:28 AM
vwnate1's Avatar
Diesel Dandy
 
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Location: Sunny So. Cal. !
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? Why thumbs down ? .
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-Nate
1982 240D stripper 393,000 miles
1984 300CD KEEPER ! 481,XXX miles
1984 Euro 300TD Fully optioned SWMBO's
1974 350SLC 4 speed SOLD & missed
Kooky Kommie Ural Motocycles (3)
BMW Moto R60/6 Barn Find, 8,000miles
1959 VW #113 DeLuxe Beetle, 36hp engine, stock
Junk, Rust, Arthritis, Crushed Spine,Broken Neck, Back & arm, lots of screws, pins & plates .
Memories, Peace Of Mind
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  #3  
Old 11-20-2018, 12:14 PM
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captmd SWAP

so I can find my post, I know swap has been done. No reply from You Tube articles which have swap. I have both cars complete . will use Marine engineer to do swap. Need to know which eng. mounts to which transmission to use . My 380 SEC , parked for 4 month, started idling good , pushed gas to speed up , thud lock up? timing chain , cams lifters look in place. Thanks fo response Mickey
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  #4  
Old 11-20-2018, 02:39 PM
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Location: Modesto CA
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cap:

It may be useful for you to review a number of posts/threads started by Clemson88 on the subject of converting a gas 126 to diesel power. It is more involved than it seems at first glance.
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  #5  
Old 11-20-2018, 11:01 PM
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Thank you, Yes MB are very detailed. Ill check out Clemson 88
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  #6  
Old 11-20-2018, 11:47 PM
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Join Date: Aug 2009
Location: MN
Posts: 1,232
1983 MB 380 SEC

Use a 603 out of a W126. Bolt in.
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Greg
2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO

2007 ML320 CDI .. / 2005 E320 CDI .../ 1998 SLK 230 .../ 1991 Daihatsu Rocky
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  #7  
Old 11-21-2018, 10:07 AM
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Join Date: Nov 2018
Posts: 11
Thank you GregMN, I believe a 603 is transition. will SD motor mounts be needed? will they bolt in to baise on frame of 380? I'm in south Texas. Mr. Vera of Corpus does not think it will work. wish I could change his mind.
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  #8  
Old 11-21-2018, 11:53 AM
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Quote:
Originally Posted by captmd View Post
Mr. Vera of Corpus does not think it will work.

You got me... I just photo shopped it and then used it as a daily driver for a couple of years....


A 603 block has motor mount attachment points for a W124 and a W126 body. If the donor was a W126, then the mounts are already in the correct location. If the donor was a W124, then the mounts need to be moved to the other mounting points.


Take a day to pull the motor and transmission, as a unit, out of the diesel donor. Label sensor wires as you take them off.

Take another day to pull the gas motor and transmission out of the 380. Swap the radiator with the diesel engine. Swap the exhaust system. Put the diesel engine and transmission in the 380.



Start it up and drive it off the lot....


There are lots of little fiddly bits to tidy up, but I have started the car on the third day and driven it.
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Greg
2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO

2007 ML320 CDI .. / 2005 E320 CDI .../ 1998 SLK 230 .../ 1991 Daihatsu Rocky
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  #9  
Old 11-21-2018, 12:23 PM
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ROLLGUY
 
Join Date: Oct 2007
Posts: 6,882
The first generation W126 had the same OM617 as a W123 300CD. It should not be difficult to swap it over if you have access to a first gen W126 for parts. You will need a W126 oil filter stand and oil pressure sender. The CD radiator and oil cooler should work in the SEC. You will also need a trans with an electronic speedo (from a first gen W126-D). If you are clever, you can make the cable driven speedo work in the W126 instrument cluster, but that may be more work than sourcing a first gen W126 trans. Of course the easiest swap would be the OM603 as suggested, but you already have the W123 as a donor. I hope the CD donor is not a complete running car. It would be more valuable as a driver than a donor. If it is a rust bucket, well then have at it (just my opinion though)......Rich
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  #10  
Old 11-21-2018, 01:01 PM
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Thanks for info, will use a Marine engineer from supply boats, we are use to swaps that don't SWAP. I'm 78 he 62 might take us 3 days. now I know it can be done ill ber mor exact om Part an model numbers. Mickey
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  #11  
Old 11-21-2018, 01:13 PM
A guy who likes to Benz
 
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Location: DC Metro/Maryland
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There's a 603 from an SDL nearby my work for sale. Should be pretty straightforward.
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I recondition w123/w126/w124/w140/r107/r129/ steering boxes!


1984 300D "Elsa" odo reset 6/2011 111k
1983 300TD "Mitzi" ~268k OM603 powered
1995 E300 "Adelheid" 262k [Sold]
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  #12  
Old 11-21-2018, 01:22 PM
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Posts: 11
Both MB are 01/83 built. 300CD was sideswiped on right side by 18 wheeler 10 years ago . Engine never stop running with Left side caved in 10 inches at A pillar, windshield did not pop out. once home drove it around with right ft. wheel at 45% angle.
126 380 SEC parked for 4 month, started idled good, increased gas locked up with thud. Starter will not turn engine. Cams ,lifters, push rods , timing chains in place.
All suggestions appreciated, MICKEY
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  #13  
Old 11-21-2018, 01:55 PM
cho's Avatar
cho cho is offline
diesel power
 
Join Date: Dec 2011
Location: Europe
Posts: 933
Quote:
Originally Posted by GregMN View Post
You got me... I just photo shopped it and then used it as a daily driver for a couple of years....



.
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w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD 2.88 diff,EGR blinded
next wish/project: w114 coupe OM603 powered
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  #14  
Old 11-21-2018, 02:33 PM
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Location: Modesto CA
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Quote:
Originally Posted by captmd View Post
Thanks for info, will use a Marine engineer from supply boats, we are use to swaps that don't SWAP. I'm 78 he 62 might take us 3 days. now I know it can be done ill ber mor exact om Part an model numbers. Mickey
Quote:
Originally Posted by captmd View Post
Cams ,lifters, push rods , timing chains in place.

Push rods!?
Troll rods.

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