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  #1  
Old 02-11-2007, 08:11 PM
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Question Engine swap W123 to W126

Hi all! New to this forum.

I have a question about using an engine from a 300D turbo(out of W123 chassis) in a 300SD(W126 chassis). Would it slide right in or would there be some modifications to make it fit and if so, how difficult.

Thanks

Sedecrem

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  #2  
Old 02-11-2007, 08:32 PM
ForcedInduction
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It's pretty much bolt in.

From the W126 engine, save the oil pressure sender, engine mount arms, and transmission.
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  #3  
Old 02-12-2007, 11:42 AM
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FI

Thanks for the info. Helps with my decision.

Sedecrem
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  #4  
Old 02-12-2007, 12:21 PM
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Also remember to....

Reuse the A/C compressor -- If you have a working one by all means do not remove the compressor from the lines. instead unbolt the compressor from the engine and just move it out of the way with the lines still attached. This saves you from getting stuck with r134.

Also I used the alternator and bracket from the W126.


One more thing... use the air cleaner from the W126. The inlet on the W123 cleaner is too small in diameter for the fresh air pipe coming from the front of the car.


Take your time and replace the motor mounts (rubber parts) as well as the engine shocks and you will be fine.

Oh and by the way, Take off the black cap on the ALDA and crank it up (out) about 1/2 turn. The W123 engine is tuned WAY down and will not motivate a heavier W126 body.
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  #5  
Old 02-12-2007, 02:43 PM
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LUVMBDiesels

Thanks for all of the recommendations. It really helps from someone who has done the job themselves.

Question. Did you use a normally aspirated 300D or the turbo version?

Thanks

Sedecrem
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  #6  
Old 02-12-2007, 02:56 PM
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82 in a sedan would be a turbo
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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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  #7  
Old 02-12-2007, 04:31 PM
LUVMBDiesels's Avatar
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Both cars were turbos. I took as much off the W123 as I could air cleaner, alt, motor mounts, etc and found that they would not fit. The biggest issue is the oil fliter, which has been mentioned before. I had to go to MB and get a new gasket for the block to oil filter housing seal (I could not find one aftermarket), but once The oil filter was in place it was easy to get the engine in and running.

Some more advice -- do your glow plugs with the engine out and the oil filter housing off makes a world of difference!

While you are over there you can adjust the Injection Pump as well -- look for threads here on how to increase the total amount of fuel available I did NOT do this but just made the "normal" ALDA tweak.

to sum up...


Keep from W126:
motor mount arms
A/C compressor
Alternator
p/s pump
oil filter housing
Air cleaner
All throttle linkages, etc

Keep from new engine

turbo unless yours is better
Vacuum pump
water pump

New parts:
Rubber motor mounts
engine shocks
radiator hoses
glow plugs
oil filter to block gasket
flexible fuel lines
water pump (always a good idea)
Air cleaner to turbo seals

Take your time and take pictures of your old engine coming out it will help you bolt everyting back together later!

good luck
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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"

Current
Monika '74 450 SL
BrownHilda '79 280SL
FoxyCleopatra '99 Chevy Suburban
Scarlett 2014 Jeep Cherokee
Krystal 2004 Volvo S60
Gone
'74 Jeep CJ5
'97 Jeep ZJ Laredo
Rudolf ‘86 300SDL
Bruno '81 300SD
Fritzi '84 BMW
'92 Subaru
'96 Impala SS
'71 Buick GS conv
'67 GTO conv
'63 Corvair conv
'57 Nomad
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  #8  
Old 02-12-2007, 10:56 PM
ForcedInduction
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Quote:
Originally Posted by LUVMBDiesels View Post
While you are over there you can adjust the Injection Pump as well -- look for threads here on how to increase the total amount of fuel available
Do NOT do that unless you have an EGT/Pyrometer gauge installed on the engine.

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