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  #1  
Old 06-21-2007, 11:55 PM
lietuviai's Avatar
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What are the differences between the 123 & 126 617 turbo diesel engines?

I have both 617.951 (126) & 617.952 (123) turbo diesel engines and am trying to figure out the differences between the engines. They both look basically identical from the outside. I'm planning on rebuilding the 126 type engine and put it in my 300D because at this point it looks like the better of the two engine blocks that I have. This is the one that was completely disassembled by the PO and the same one I started a thread about possibly resleeving the one "bad" cylinder. I discussed the issue of the damage with a mechanic I know and trust and he suggested to me that the cylinder is usable as is and does not need resleeving.
My 123's engine block appears too worn out to use as is because of the ridges at the tops of the bores so I'm going to go ahead and reassemble the 126 type engine.
So at this point I'm wondering what I should look out for between the 2 different engine models.

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84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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  #2  
Old 06-22-2007, 07:12 AM
Admiral-Third World Fleet
 
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I can't think of much besides the mounts and the oil pressure sender...

Anybody else?
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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)
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  #3  
Old 06-22-2007, 08:05 AM
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They are essentially interchangible.

Tom W
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[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.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #4  
Old 06-22-2007, 09:37 PM
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I don't have any 126 mounts to compare. I did notice the sender did not fit from the 951 to the 952. I think it was more how the fitting in the oil filter housing is angled. It looks like the filter housings might be different. The 952 engine has a different turbo. I have both types of turbos, each from the different engines.
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84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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  #5  
Old 06-23-2007, 12:44 AM
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which comes on which? (seeing that it has been apparently useful to compile seemingly useless obscure knowledge)

sveikas.
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  #6  
Old 06-23-2007, 12:47 AM
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Quote:
Originally Posted by rudolfgreen View Post
which comes on which? (seeing that it has been apparently useful to compile seemingly useless obscure knowledge)

sveikas.
617.951 = 300SD

617.952 = 300D

Labas!
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84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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  #7  
Old 06-23-2007, 09:30 AM
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was actually speaking of the turbos..is the A/R on the .951 and the KKK on the .952?
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Old 06-23-2007, 12:56 PM
Abandon the Roads!
 
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From what I've read, it should be possible, but it will help if you have both cars right next to eachother for the oddball parts that differ (like the oil filter housing, IIRC).
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1984 300DT turbo 138k mi

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  #9  
Old 06-23-2007, 12:56 PM
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My 952 had the KKK while one of my 951's had the Garret. I have another turbo that's in pieces that was from the other 951 but I haven't looked to see what type it is. I also have another Garret that came from an 85 300D I used to have. It's from a CA emissions model engine so its even different from the other Garret from the 951 engine.
I guess Garret's were used on some engines after Jan '83. Interestingly, my KKK was on an 84 engine.

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84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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