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Old 03-11-2009, 02:51 AM
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Difference between 300SDW116 and 300DW123

Does anyone know the difference between the engines of the 300SD W116 and 300D W123 turbo diesel?
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Old 03-11-2009, 03:40 AM
cdplayer's Avatar
Just my Jeep and my S500
Join Date: Aug 2006
Location: Sacramento, Calif.
Posts: 581
W116 vs W123

The W116 300SD was built only from 1978 to 1980. Engine number 617.950.
Those made for the US market were turbo charged. May have been for Euro market too. Not sure.
W123 300D for the same model years came with engine number 617.912 and were not turbo charged.
Hopefully others will chime in with more specs.

Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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Old 03-11-2009, 03:42 AM
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Waiting for his Model 3..
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
No S-Class diesels for the euro market until 1996 with the S350 Turbo.

1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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Old 03-11-2009, 05:09 AM
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Rollin' on 16s
Join Date: Dec 2005
Location: Vancouver WA
Posts: 6,528
The '78 and '79 SD engines had less horsepower than the '80 and the W123 turbo engines due to the cam shaft
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine
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Old 03-11-2009, 07:11 AM
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Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 33,218
I believe the engines are effectively interchangible with minor differences.

Is the AC and oil filter in the same location as the later motors?
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. It still needs upholstery redone...I also have a 427 Cobra replica with an aluminum chassis.
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Old 03-11-2009, 09:49 AM
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Join Date: Jan 2002
Posts: 18,355
AC and oil filters are the same on my 79SD and 85TD. Vacuum pumps are different. PCV system is different.
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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Old 03-11-2009, 10:15 AM
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Join Date: Mar 2008
Location: Lebanon, TN
Posts: 8
I swapped the engine and transmission from a '82 300D into my '80 300SD. The only real issues were the engine mounts and the upper oil pan.Be sure to swap the upper oil pan. I found out about the upper pan interference after I had it installed. I know it's not Kosher but I used a sawzall to trim the pan rather than R&R the engine again. (Working alone, outside, in the dirt, already had to remove the original and remove the donor engine, one install was enough) The existing tranny bracket had extra holes that fit the larger 300D trans, length was compatable as well.
1980 300SD "Gretchen"
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