Author Topic: 1983 w123 engine into 1980 w116  (Read 219 times)

jtwoods4

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1983 w123 engine into 1980 w116
« on: 19 December 2018, 10:33 AM »
Hey everyone I have a 1980 w116 300sd. It does not have an engine/transmission but I have an engine and transmission from a 1983 w123 300D.

Is this engine and transmission a direct drop in for the 1980 300sd?
1980 300SD

Squiggle Dog

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Re: 1983 w123 engine into 1980 w116
« Reply #1 on: 19 December 2018, 11:23 AM »
The upper oil pan on the 300D's engine is probably a different shape and won't fit in the W116, as the upper oil pan would hit the cross-member. But, you might be able to use an upper oil pan from a 1970s non-turbo 300D. The W123 transmission will likely be geared differently than a W116 transmission, and you may run into fitment issues with shift linkage and driveshaft length, not to mention wiring.
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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Heated Seats, 346,000+ Miles

Alec300SD

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Re: 1983 w123 engine into 1980 w116
« Reply #2 on: 19 December 2018, 11:48 AM »
As Squiggle Dog said, there will be clearance issues with the engine from the 83 W123 300D, and possibly the tranny as well.
You first will need to swap a 1980 W116  upper oil pan onto the 83 OM617A engine.

The 1978 and 1978 W116 300SD upper oil pans have the single oil return nipple for the turbo oil return tube.
Only the 1980 W116 300SD upper oil pan has the two oil return nipples for the turbo oil return tube and the crankcase oil seperator return tube.

I have on hand two 1980 upper oil pans to eventually install ln my 300SDs.
PM me if you end up needing to acquire one of them for your project.
79 W116 300SD 'Stormcloud' new as of 10/22/2017
78 W116 300SD 'Desert Rose' new as of 01/26/2014
83 W126 300SD 'Rena 2.0' with engine from 82 W126 300SD Rena' (SOLD and crushed 11-20-2017)

Squiggle Dog

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Re: 1983 w123 engine into 1980 w116
« Reply #3 on: 19 December 2018, 02:02 PM »
Also, the engine mounting arms are probably different.
Stop paying for animal cruelty and slaughter. Go vegan! https://tryveg.com/

1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Heated Seats, 346,000+ Miles

jtwoods4

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Re: 1983 w123 engine into 1980 w116
« Reply #4 on: 19 December 2018, 08:31 PM »
Sounds like it's not worth the trouble. Where can I purchase a 1980 300 SD engine? Is there a specific model or code that identifies the engine as specific to the 1980 300SD.
1980 300SD

Diesel 617

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Re: 1983 w123 engine into 1980 w116
« Reply #5 on: 20 December 2018, 06:45 AM »
Engine: OM617.950
Transmission: 722.120
Both are specific to the 1978-80 300SD

In all honesty it will almost certainly be more worth buying an entire car with a running engine and transmission. Unless you are opting for a rebuilt engine 4K-6.5K(check out reinventthewheel + shipping. And your have an excellent supply of every part you'll need to keep going.

Another note the w116 300SD transmission was the last year where a speedometer cable was used (went from the trans tail housing to the instrument cluster for mileage and speed)
« Last Edit: 20 December 2018, 10:06 AM by Diesel 617 »
1980 300SD
2 OM617.950 complete with transmissions
1980 450SEL Transmission (for sale 150kmi 100$ + freight)

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orientrot

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Re: 1983 w123 engine into 1980 w116
« Reply #6 on: 21 December 2018, 04:32 PM »
Other Atlanta 300SD guy here. I had to reset my phone so I don't have your number anymore, but I may be able to help again. I have 2 working 116 300SD transmissions (one I was told was a recent rebuild) and a 116 300SD engine that has head/compression issues that you could cannibalize for the W116-specific parts.
'80 Orient Red 300SD- 185,XXX 
'83 300D- 100,XXX- 4-speed
93' 190E 2.6 Sportline Limited Edition- 202,000
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Malpaso44

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Re: 1983 w123 engine into 1980 w116
« Reply #7 on: 22 December 2018, 04:58 AM »
I have a running 1979 300SD with a good engine and transmission. The valves have been adjusted and she really drives and shifts well. The interior however is toast. I have three Mercedes and I won't be restoring this one. The car can be driven wherever you need to take her. Let me know if you are interested.
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UTn_boy

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Re: 1983 w123 engine into 1980 w116
« Reply #8 on: 22 December 2018, 09:29 AM »
If any of you Georgia fellas ever get up to Knoxville please stop by! :) 
1966 250se coupe`, black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3, papyrus white/dark red leather
1973 300sel 4.5, silver blue metallic/blue leather
1976 280s astral silver/blue MB Tex
1978 450sel 6.9 Euro, Anthr/velour