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Thread: Hunting for a 121.928.10 engine!!

  1. #1
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    Hunting for a 121.928.10 engine!!

    Recently I took my black 190 to a specialist so that I could get a comprehensive list of things that needed doing on her.
    I could easily see the interior and that sort of thing, but I wanted an in depth understanding of the state of her, from the wheels up.
    Unfortunately I wasn't expecting quite the list I got, and most shockingly of all is the fact that I have THE WRONG ENGINE in her!
    There are some differences, as its out of a saloon car.

    This leaves me in a pickle, and goes quite some way to explain why I now find myself in the market for an engine

    If anyone knows of an engine, or someone who may have one, or indeed the merest whiff of an engine, a 131.928.10, then I would love to know!!

    Please help me in my quest to make my car whole again!
    Last edited by TimCockburn; 10-11-2019 at 02:11 AM.

  2. #2
    Administrator JimVillers's Avatar
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    Re: Hunting for a 121.928.10 engine!!

    Tim .... What engine do you currently have in the car (I assume that you are talking about a 190SL)? The 921.928 engine is correct for 190SL's built after August 1961, chassis 222122. The 921.921 engine would have been correct for chassis numbers prior to that.
    Jim Villers
    1961 190SL, 230SL 5-speed, MGB 5-speed, Porsche 356C; 1967 Porsche 911; 1950 Jeep CJ3A

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    Re: Hunting for a 121.928.10 engine!!

    Hi Jim
    Yes, it's a 190sl, but she has a fintail engine in her at the mo. Someone has gone to a great deal of effort to make it fit.
    So, that leaves me needing a 928 engine (1963 190sl) to make her authentic.
    I think it's going to be a long slog!!

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    Re: Hunting for a 121.928.10 engine!!

    Tim,

    A complete 1963 engine may be hard to find. You might consider just replacing the top end with a 1963 190SL head and attaching parts as they are interchangeable. Would be lots easier and cost much less.

    Just in case, I have a complete 1962-3 head and valve assembly ready to install. Bought it by mistake as a spare for my 1961 which has a different head. Found a new factory replacement head for 1961 and earlier cars so don’t need it anymore.

    Thought you might like to know.

    Good luck,

    Coy

  5. #5
    Administrator JimVillers's Avatar
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    Re: Hunting for a 121.928.10 engine!!

    I have a 940 engine ready to install if you are interested.
    Jim Villers
    1961 190SL, 230SL 5-speed, MGB 5-speed, Porsche 356C; 1967 Porsche 911; 1950 Jeep CJ3A

  6. #6
    56 & 60 sl & 67 Sedan 230 Andre Hudon's Avatar
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    Re: Hunting for a 121.928.10 engine!!

    Jim,
    Does it mean you removed your 940 off your 190sl and went back to a standard one?
    I love my 940 in mine, I do not see a reason to go back to a 921, except to sell her to a purist.
    ________________________________
    André Hudon

  7. #7
    Administrator JimVillers's Avatar
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    Re: Hunting for a 121.928.10 engine!!

    Andre ... I also liked my 490 engine but I am restoring my car again and want to show it in AACA national shows so that required me to go back to my original engine with Solex carbs.
    Jim Villers
    1961 190SL, 230SL 5-speed, MGB 5-speed, Porsche 356C; 1967 Porsche 911; 1950 Jeep CJ3A

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    Re: Hunting for a 121.928.10 engine!!

    Thanks for all your input, guys.
    So, I'm not too sure what engine is in my car at the moment as someone has very kindly taken the engine number off.
    It may be a 940,but I DO know that there is no support under the carbs, which is something I understand the 928 engine does have.
    I will keep looking for an engine to suit it, so a 928.10, but will live with and love the engine that's in it for now.

  9. #9
    56 & 60 sl & 67 Sedan 230 Andre Hudon's Avatar
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    Re: Hunting for a 121.928.10 engine!!

    A 940 engine will have 4 holes each side of the block to bolt on side supports.
    ________________________________
    André Hudon

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    Re: Hunting for a 121.928.10 engine!!

    So my car is also victim of a number-less engine swap. I have long ago given up on authenticity, so the fact I've got a different engine doesn't bother me. Anyway, I've always thought that it was a 928, but this thread has me wondering. The engine timeline page at http://www.190slgroup.com/joomla/index.php/technical doesn't really identify the differences between the 921 and 928 and doesn't mention the 940 at all.

    Can one of our experts give us a field guide to identifying these three engines? Probably just the differences in the block would be sufficient. To get started, here are a few images I gleaned from the internet. Kinda random pictures, but I don't think I have a 940 engine in this set.
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    Frank Stutzman
    '56 190sl (chassis 01186)
    Done with paint, let the wild re-assembly begin!!!
    Boise, id

  11. #11
    Administrator wpuryear's Avatar
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    Re: Hunting for a 121.928.10 engine!!

    According to the Mercedes engine cross reference manual, the same block 121 010 43 08 was used for:

    180a
    180b
    180c
    190
    190b
    190sl (121.921)
    190sl (121.928)
    Lu.0319B (121.922)
    Lu.0319B (121.926)

    Walt

  12. #12
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    Re: Hunting for a 121.928.10 engine!!

    Well, OK, maybe pointing out the differences in the block is insufficient to differentiate between the 921, 928 an the 940.

    I'm pretty sure the 921 can be easily identified by the side plates. What differentiates between a 928 and a 940?

    (I know the 940 is not a standard engine in any 190sl car, but it does seem to be a common swap)
    Frank Stutzman
    '56 190sl (chassis 01186)
    Done with paint, let the wild re-assembly begin!!!
    Boise, id

  13. #13
    Administrator wpuryear's Avatar
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    Re: Hunting for a 121.928.10 engine!!

    On the 928, the head of course. Same block but different length connecting rods and pistons but the sum of the two resulted in the same length as the 921. How you recognize a 928 head from the exterior, I don't know. The valve covers were different but again, don't know how the changes went. After 8502067 the 921 didn't have the side plates.

    On the 940, it's big advantage, 5 mains.

    Walt

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    Re: Hunting for a 121.928.10 engine!!

    Quote Originally Posted by wpuryear View Post
    On the 928, the head of course. Same block but different length connecting rods and pistons but the sum of the two resulted in the same length as the 921. How you recognize a 928 head from the exterior, I don't know. The valve covers were different but again, don't know how the changes went. After 8502067 the 921 didn't have the side plates.

    On the 940, it's big advantage, 5 mains.

    Walt
    The easy way to identify a 940 head vs a 928 head is to examine the intake ports.

    The 928 head has the telltale 190SL rectangular manifold intake ports. The 940 head has rounded intake ports.

    Coy

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