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Thread: Mercedes om611 in s3?

  1. #1
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    Mercedes om611 in s3?

    Hey All, ive had thoughts about this for a while now. I've got 2 Mercedes 638 vitos 112cdis behind the shed, 1 hope to get back on the road one day when I can find this damn air leak and put a manual box in it..and the other is for the doner for the box. The doner has the engine in the back as it's from a different van, so it's already been a double doner lol. Anyway I was told the engine still runs it's clearly got the black death, so it needs new injectors and all that but if I do the conversion I'd probably part rebuild it anyway.
    Ive read about people using other om family engines so it's gotta be similar. It would be going into my s3 which is a 6cyl build. My main concerns are obviously mating it to the series gearbox. But the other thing I'm concerned about it's not MFP and all the electrics just ain't gonna happen. So I gotta do a MFP conversion also.
    Anyone out there done the OM conversion before?
    I'm sorta dreaming with it but hey I've got the engine sitting there so If it's possible I may look at doing it.
    Cheers Jim

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    Which end of the donk is the sump bump? Forwards and it'll be clobbered by the diff.

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    Quote Originally Posted by bee utey View Post
    Which end of the donk is the sump bump? Forwards and it'll be clobbered by the diff.
    TBH I'm not sure I havnt sussed it out but it was one of my concerns. I've read about people making new sumps for the other vairiants. This engine is only the 4 cyl but it still puts out plenty of power, probably perfect for the s3 running gear. Another concern is that it was east west mounted but in the newer vitos it's forward facing so should be a way around it. My 1st thing is calling damler benz or searching through my star workshop program and finding a different fuel pump to do away with the common rail. If that's all doable I'll look at doing it, if not well maybe I'll sell the engine, turbo and bits I don't need for my other van and buy an older om 6cyl or perkins 6cyl.
    Hmmmm

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    Ask at Dieselmeken about a mechanical pump. He can build one out of an electronic on for the OM606 and others, so might get lucky.

    https://www.google.com/url?sa=t&rct=...xFXGBLvJX0Hven

    check out his youtube clips for evidence of his expertise.

    YouTube


    Don.

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    Quote Originally Posted by Don 130 View Post
    Ask at Dieselmeken about a mechanical pump. He can build one out of an electronic on for the OM606 and others, soy might get lucky.

    https://www.google.com/url?sa=t&rct=...xFXGBLvJX0Hven

    Don.
    Thank you very much I'll definitely ask them. It's all a bit of a dream like I said but it could be a reality. Anything is doable if you got the spendiff to throw at it!

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    Just checking you know those guys.. Diesel Pump UK
    I know its more the 606 they talk about

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    Quote Originally Posted by timax View Post
    Just checking you know those guys.. Diesel Pump UK
    I know its more the 606 they talk about
    Thanks very much, I tried dieselmeken but they don't do it. I just emailed DP UK see how they go.
    Cheers

  8. #8
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    there's lots of OM Merc engines being adapted into landrovers now in the UK, along with BMW engines so there should be plenty of available information and adaptors about, check out modified landrovers on facebook, there'll be a few similarly titled pages but you'll bump into Merc engine conversions fast enough with a little search of facebook

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    Quote Originally Posted by LRJim View Post
    TBH I'm not sure I havnt sussed it out but it was one of my concerns. I've read about people making new sumps for the other vairiants. This engine is only the 4 cyl but it still puts out plenty of power, probably perfect for the s3 running gear. Another concern is that it was east west mounted but in the newer vitos it's forward facing so should be a way around it. My 1st thing is calling damler benz or searching through my star workshop program and finding a different fuel pump to do away with the common rail. If that's all doable I'll look at doing it, if not well maybe I'll sell the engine, turbo and bits I don't need for my other van and buy an older om 6cyl or perkins 6cyl.
    Hmmmm
    WARNING: This is long and windy!

    I'm in Canada and I'm not too familiar with your engine options down there, so this may or may not be useful, but here it is: Go with your last thought and unload the Sprinter 4 with the common-rail and the printed circuits. I can't comment of the Perkins option, but definitely look at the older Mercedes 5-cyl, not 6. Specifically, the trusty OM617, the longevity champ, in either 300D or 300TD form, all mechanical and even a manual stop. The turbo produces about 125 hp as is, no messing about with trying to convert to a different fuel system. (The turbo mounts on the right, however, which might be an issue with your RHD.) If you don't have a source down there, you can buy the adapter and pilot bearing w/sleeve from a guy in Sweden for about $650 AUS (that was 5 years ago, prices may have gone up) plus shipping. He can help with sourcing a flywheel too, which is helpful to us North Americans, where Mercedes only imported diesels with mush-boxes. You can buy the engine (all of which outlast the rusty sedans they came in) and the kit for less than a new IP, and none of the work. Yes, the sump is at the front of the pan, but it's a separate, small steel pressing that bolts to the alloy pan. Anyone who can MIG a bit of steel plate can make the simple mods to clear the axle. You will also have to fab a pair of engine mount adapters to mate the M-B mounts to the frame, pretty straight-forward. If you value your dental work, USE THE MERCEDES DIESEL ENGINE MOUNTS! They're sophisticated units, designed that way by experts for a very good reason.

    Bear in mind, unless you're starting with a 6-cyl Land Rover, any engine longer than a 4 will have length issues. Luckily, since you need to use the matching Mercedes rad and expansion tank with the OM617, you've got a leg up: It's thinner and horizontal, and only basic sheet metal mods are required to move it forward in the rad panel without affecting the stock appearance of the truck.

    All of this sounds like work, but in the end it's less work and expense than what you'd go through to make the Sprinter engine run with a fuel system for which it was never designed. Bear in mind that the little 4-cyl gets much of it's 120-odd hp from that Star Wars fuel system; take it off and you probably won't make any more power than the OM's 4-cyl counterpart, the 240D. That motor is MUCH easier to install, uses the same adapters, but doesn't have enough power to make the job worthwhile. The OM617 conversion is tried and true, done for years in the UK and the US. It has an awesome record for reliability and longevity, and parts and advice for the conversion are widely available. Check Youtube for videos on the conversion. While you're at it, check the more numerous videos of Mercedes conversions in Jeep CJ's and Wranglers. Those will show you the performance available from the OM (in a heavier steel truck). But bear in mind that rednecks love noise; most of their Jeep conversions use open turbos or minimal silencing. Using M-B mufflers will make it civilized.

    Okay, I've made my case. It's up to you. If you want any links, PM me and I'd be happy to share what I've got.
    Last edited by vykkagur; 13th July 2021 at 08:49 PM. Reason: typo

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