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Thread: To convert or not

  1. #1
    Join Date
    Dec 2007
    Location
    South Australia
    Posts
    1,208

    To convert or not

    I have been running my Mercedes 190D for over a year on a blend of vege and petrol. Often not quite enough petrol as was shown this week when the temp dropped to 5degrees and I couldn't start it at all. Heated up manifold and top of injectors the with heat gun for few minutes but after a mild splutter no go.
    Was late meeting a tradie after having to transfer to the Jackaroo, which started instantly BTW?
    I've never been too comfortable with starting on cold oil or using petrol but am sure the Merc would start under any conditions if it had diesel to start on, so is it worth a simple conversion? I'm thinking a tank in boot with a facet pump for diesel, leave return as is and switch Vege off and on with gas solenoid. Any thoughts?
    Johnnojack
    4WD Isuzu Jackaroo 3.1 190000km on WVO,(2019) 2 tank home built system 6 solenoids heated filter, fuel line and tank pickup for thicker oil. Mk. 9 version now and no changes planned
    Mercedes W201 190D 1986 model: no fuel mods except bigger fuel line from tank, running blend of 90% oil 10% petrol 11000km to date. Motor purrs but car has electrical gremlins

  2. #2
    Join Date
    Sep 2005
    Location
    WA
    Posts
    4,262

    Re: To convert or not

    JJ, Try one of these valves.
    They are available as 2 wire (you need a double pole, double throw switch wired as a reversing switch) 3 wire, (a single pole double throw switch will do) or 5 wire (which is like a 2 wire with indicator switches to show when operated to either state).
    The one I linked to is a 20mm BSP thread so you just need some 20mm BSP hose barb adaptors to make it connect to your system.
    No Pump needed as the lift pump on the IP will bring the fuel from the selected fuel tank.


    I would prefer a separate fuel filter for each fuel so you do not need to purge the filter when changing to diesel at the end of the day.

    Tony

    PS, I used 20% misfuel (basically petrol with a little bit of diesel in it - from people who fill up their diesel with petrol) with veggie in winter in my Musso (OM662 2.5L 5 cylinder turbodiesel)
    Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

    Current Vehicles in stable:
    '06 Musso Sports 4X4 Manual Crew Cab tray back.
    '04 Rexton 4X4 Automatic SUV
    '2014 Toyota Prius (on ULP) - Wife's car

    Previous Vehicles:
    '90 Mazda Capella. (2000 - 2003) My first Fatmobile. Converted to fun on veggie oil with a 2 tank setup.
    '80 Mercedes 300D. 2 tank conversion [Sold]
    '84 Mercedes 300D. 1 tank, no conversion. Replaced engine with rebuilt OM617A turbodiesel engine. Finally had good power. Engine donor for W123 coupe. (body parted out and carcass sold for scrap.)
    '99 Mercedes W202 C250 Turbodiesel (my darling Wife's car)[sold]
    '98 Mercedes W202 C250 Turbodiesel (my car)[sold]
    '85 Mercedes Benz W123 300CD Turbodiesel
    '06 Musso Sports Crew Cab. [Head gasket blew!]

    Searching the Biofuels Forum using Google
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  3. #3
    Join Date
    Apr 2016
    Location
    Melbourne
    Posts
    6

    Re: To convert or not

    Different engine but I'm going to convert my Land Rover Discovery 300tdi.
    It is getting harder to start in the cold Melbourne winter even with a 10% petrol mix and some extra diesel mixed in. I have heating so it is all good once the engine is up to temp.
    Will be running two filters as per Tony's post and an electric lift pump as the Land Rover ones are known to fail.

  4. #4
    Join Date
    Sep 2009
    Location
    Brisbane (North Side)
    Posts
    771

    Re: To convert or not

    Johnno,

    if you stuck starting a diesel due to low temperatures (insufficient glow heat) you can always create a rough start with a can of deoderant. the propellant will self ignite like diesel under compression. of course the ignition timing is a little off (I think its a bit early) and it is a bit rough, but you will probably find that it will generate enough heat in the cylinder to support normal combustion within a few OTTO cycles.

    I have started quite a few diesel engines for people (including my own) with deoderant. It is very effective if your glow system has failed either through failed plugs or some other electrical problem. Of course there is the "start ya bastard" and "aerostart", but deoderant works just fine too. Sometimes you may need a second person to stay on the spray can while you crank.

    I find the best place to squirt it is in the PCV pipe where it enters the air cleaner box. very easy to get to with out tools.
    Regards,

    Cade.

    2006 Landcruiser HDJ100 (1HD-FTE) 20,000 on bio
    2006 Ford Courier(WLT Motor), 10,000 on bio
    2002 Landcruiser HZJ105r (1HZ motor) 250,000 on bio (sold)
    2006 Mazda B2500 (WLT motor) 80,000 on bio (sold)



  5. #5
    Join Date
    Dec 2007
    Location
    South Australia
    Posts
    1,208

    Re: To convert or not

    Things went from bad to worse this morning. Jumped into the Jackaroo with frost on the windscreen, gave it a couple of glows and cranked her over but no go. Then discovered I hadn't flushed the night before. Oh no! This is not good. Trouble with running one car with single tank and the other with dual tanks after a period in the single tank car you forget what the procedure is in the other and do half the trip on diesel or forget to flush at the end. Ok so I had to get it going, got the heat gun and gave the manifold, intercooler, injectors, lines and IP a good 10 minutes of blessing. Still no go, bit hard to put petrol rag down the inlet like I did with the Merc so more waving the heat gun around for about 20 minutes final blast over the intercooler and quick dash to the drivers seat, a quick glow and crank. Started with enough blue smoke to alert the local fire brigade then after a minute settled down to steady idle. Won't be forgetting to flush for a while I can tell you.
    Cade I did start the Merc with a bit of petrol on a strip of rag pegged in the inlet but not something I'd like to do on a regular basis.

    Question for anybody who have or have had a Merc with a conversion, How long (distance) would you need to flush for for an easy start the next (cold) morning?
    Last edited by Johnnojack; 21st June 2019 at 10:48 PM.
    Johnnojack
    4WD Isuzu Jackaroo 3.1 190000km on WVO,(2019) 2 tank home built system 6 solenoids heated filter, fuel line and tank pickup for thicker oil. Mk. 9 version now and no changes planned
    Mercedes W201 190D 1986 model: no fuel mods except bigger fuel line from tank, running blend of 90% oil 10% petrol 11000km to date. Motor purrs but car has electrical gremlins

  6. #6
    Join Date
    Sep 2005
    Location
    WA
    Posts
    4,262

    Re: To convert or not

    JJ, On my 300D, I went to 20% misfuel in the veggie blend for winter, otherwise no changes and no conversion necessary.
    For a 2 tank system, purge time depends on whether you are purging the fuel filter as well as the IP.
    If just purging the IP, about 2 minutes or less. depending on the engine power delivery (our driveway is 160m long and 15m elevation in that distance, so flick back to diesel at bottom of drive and drive up to the house, engine ready for cold start tomorrow)
    I had to slowly pour a kettle of boiling water over the IP and injectors on one occasion with my first 300D (2 tank conversion) when I forgot to purge.
    Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

    Current Vehicles in stable:
    '06 Musso Sports 4X4 Manual Crew Cab tray back.
    '04 Rexton 4X4 Automatic SUV
    '2014 Toyota Prius (on ULP) - Wife's car

    Previous Vehicles:
    '90 Mazda Capella. (2000 - 2003) My first Fatmobile. Converted to fun on veggie oil with a 2 tank setup.
    '80 Mercedes 300D. 2 tank conversion [Sold]
    '84 Mercedes 300D. 1 tank, no conversion. Replaced engine with rebuilt OM617A turbodiesel engine. Finally had good power. Engine donor for W123 coupe. (body parted out and carcass sold for scrap.)
    '99 Mercedes W202 C250 Turbodiesel (my darling Wife's car)[sold]
    '98 Mercedes W202 C250 Turbodiesel (my car)[sold]
    '85 Mercedes Benz W123 300CD Turbodiesel
    '06 Musso Sports Crew Cab. [Head gasket blew!]

    Searching the Biofuels Forum using Google
    Adding images and/or documents to your posts


  7. #7
    Join Date
    Dec 2007
    Location
    South Australia
    Posts
    1,208

    Re: To convert or not

    Fattima I've always liked the design of the 300tdi and it should be a good engine to convert. Purge times should be short as well. You plan sounds good. Try to minimise the length of unheated oil pipe before the IP. I did it by swapping the oil filter to where the diesel filter was, and moving the diesel filter back to the firewall, different engine though.
    Johnnojack
    4WD Isuzu Jackaroo 3.1 190000km on WVO,(2019) 2 tank home built system 6 solenoids heated filter, fuel line and tank pickup for thicker oil. Mk. 9 version now and no changes planned
    Mercedes W201 190D 1986 model: no fuel mods except bigger fuel line from tank, running blend of 90% oil 10% petrol 11000km to date. Motor purrs but car has electrical gremlins

  8. #8
    Join Date
    Dec 2007
    Location
    South Australia
    Posts
    1,208

    Re: To convert or not

    Thanks Tony, I will use another filter for diesel and tee it in just before the IP. While the factory lift pump would work for both fuels, it makes it impossible to use seperate filters that's why I planned a Facet in the boot.
    Haven't been able to procure any misfuel yet, the Holden and VW service centres both have my number. Will call at Automasters I think.
    Last edited by Johnnojack; 22nd June 2019 at 08:35 PM. Reason: Didn't make sense before.
    Johnnojack
    4WD Isuzu Jackaroo 3.1 190000km on WVO,(2019) 2 tank home built system 6 solenoids heated filter, fuel line and tank pickup for thicker oil. Mk. 9 version now and no changes planned
    Mercedes W201 190D 1986 model: no fuel mods except bigger fuel line from tank, running blend of 90% oil 10% petrol 11000km to date. Motor purrs but car has electrical gremlins

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