300 Turbo Diesel W124 conversion

Discussion in 'Engine' started by syncropaddy, Mar 31, 2017.

  1. syncropaddy

    syncropaddy Active Member

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    I have just picked up a W210 300 turbo diesel saloon with 150k on the clock with a view to using all the good stuff to convert a W124 to turbo diesel. Other than the engine, transmission and rear diff, what else do I need to remove from the w210 - which incidentally, is rust free.
     
  2. stwat

    stwat MB Enthusiast

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    Will the steering box be an issue?
     
  3. OP
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    syncropaddy

    syncropaddy Active Member

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    Yes but I have a hammer and some imagination ....
     
  4. wu56Shoozz

    wu56Shoozz MB Enthusiast

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    You'll need all the electrics and looms where possible and probably a STAR laptop to communicate it all..and remove codes..trust me, once disturbed you'll get plenty I'd think...
     
  5. neilrr

    neilrr MB Enthusiast

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    If it's rust free I'd leave it alone & drive it.
     
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  6. krimat2005

    krimat2005 Active Member

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    Have a look on dieselpump.co.uk website. Plenty of what you need. Depending on what power you want to achieve I don't think there is much more you can remove from W210 and reuse in W124. Brakes not compatible and you'll need bigger ones . Maybe propshaft...
    Good Luck!
     
  7. OP
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    syncropaddy

    syncropaddy Active Member

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    Its rust free for a reason and that's because the car is in Ireland where we don't salt the roads. The market value of the car is not a lot and the road tax is €1500 per year .......

    Its a breaker
     
  8. neilrr

    neilrr MB Enthusiast

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    How much is the tax on a 124?
     
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    syncropaddy

    syncropaddy Active Member

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    E200 €710
    e220 €951
    230e €994
    250d €1080
    260e €1294
    e280 €1443
    300e €1494
    e320 €1809

    :(
     
  10. carat 3.6

    carat 3.6 MB Enthusiast

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    If your planning to run the engine on the w210 ecu, you will need nearly everything electrical from the donor car to avoid running in limp mode.

    The w124 rear diff will handle the power no problem, also the w210 prop front section will mate to the w124 6cyl rear section.

    The steering box is not the issue people think it is, a custom downpipe is all that is required to get around that problem.

    One problem you will have is an intercooler, unless you want to remove the ac radiator there is very little room to fit one behind the stock bumper. It's not impossible but very time consuming.
     
  11. carat 3.6

    carat 3.6 MB Enthusiast

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    I've got to do this very swap later this year for a forum member using the stock ecu, so looking forward to a few electrical headaches. :D
     
  12. OP
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    syncropaddy

    syncropaddy Active Member

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    Thanks for that info. Can I use a stand alone ECU from a third party?
     
  13. carat 3.6

    carat 3.6 MB Enthusiast

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    Realistically no, however I heard of people modifying the stock ecu to run the engine without any of the input's from the other systems (I'm not certain how the gearbox is controlled in this situation though).

    Most people just fit the old mechanical pump from the om603 to do away with ecu's altogether, and run a manual gearbox.
     
  14. OP
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    syncropaddy

    syncropaddy Active Member

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    How does that sit with emissions and does it affect the characteristics of the engine?
     
  15. carat 3.6

    carat 3.6 MB Enthusiast

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    You will get slightly more smoke on hard acceleration, but nothing to worry the mot test. Depending on how the pump is set up, performance is improved.
     
  16. OP
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    syncropaddy

    syncropaddy Active Member

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    Brilliant thanks. I have a 6 speed manual from a W210 compressor which I believe might do the trick. I also have a 5 speed from a W124 E220. Just need a flywheel and clutch assy and a pump!
     
  17. carat 3.6

    carat 3.6 MB Enthusiast

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    The 6 speed is an awesome gearbox, a world away from the merc manuals of old. The only thing to be aware of when fitting this to a w124 is the lack of drive for the cable speedo.
     
  18. krimat2005

    krimat2005 Active Member

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    carat 3.6 did you forgot to add that your ssuperturbodiesel is running 500bhp + atw??
    How is it going anyway?
     
  19. carat 3.6

    carat 3.6 MB Enthusiast

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    Sideways mostly.:D

    It will get 40mpg if your gentle so I use it as my daily driver.

    [​IMG]
     
    Last edited: Apr 3, 2017
  20. OP
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    syncropaddy

    syncropaddy Active Member

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    How do I get around that?
     

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