cold starting a 508d update.

Discussion in 'Mercedes' started by WESTERNSTAR1, Dec 17, 2009.

  1. WESTERNSTAR1

    WESTERNSTAR1 Read Only Funster

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    :BigGrin::BigGrin::BigGrin::BigGrin:Hi.thanks for all the previous responses.
    I took the engine cover off today for a look.
    it has a om314 4ltr diesel.
    there are no glo plugs anywhere i could see.
    it looks like the injector pipes screw straight into the engine.
    it doesnt look like a conventional injector set up.
    the truck is 1977.
    a friend suggested maybe it has a lever on the pump for cold start?
    it started fine this morning but its a lot warmer!
    any further advice would be very welcome.
    we are at a bit of a loss here.
    i have a manual for it only its all in german!
    it states the larger 6cyl engine has a cold start on the key,but not the 4cyl.
    the rest is in german so a bit difficult to read.
    any ideas here?
    Cheers Don and Susie
     
  2. olley

    olley Funster

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    Hi no idea what pump you have but just incase it's like the old simms inline pumps, on the side of the pump theirs a button on the side of a lever, push the lever fully over and press the button in, this is the excess fuel button. Its the top of the two levers in the picture. The button is the black bit you can see on the lever pivot

    Failing that you may just have to use easy start if your compressions are a bit down.

    Olley
     

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    Last edited: Dec 17, 2009
  3. Geo

    Geo Trader - Funster

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    Buy plenty
    once you start using that it will never start again without it:Eeek:
    I cant even find your motor in the data sheets to offer any known issues:Doh:
     
  4. Fatalhud

    Fatalhud Read Only Funster

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    Hi Don/Susie

    I use to own a 608D many years ago, But for the life of me cannot remember if it had a cold start lever.

    All I can remember is it had a black knob which could be used for adjusting tickover (turn) or stopping the engine (pull), Although it was easier to kill the engine by putting your foot under the accelerator pedal and lifting it up

    I think the main issue was to make sure you had a healthy battery to turn the engine over

    The 608D had 24 volt electrics, including headlights/indicators
    Am I right in saying the 508D has 24volt starting with a dropper box for 12v light,ect

    Alan H
     
  5. Braunston

    Braunston Read Only Funster

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    Hi,

    You said yesterday that you thought there was a glow plug in the inlet manifold, have you confirmed this only my Deutz Boat engine has a Glow Plug fitted on the inlet manifold and it needs to stay on for at least 30 secs and as the temperature gets colder for considerably longer.

    Also be very careful using Easy Start if you have got a Glow Plug in the inlet manifold, if you use or the glow plug is automatically energized then spraying easy start down the inlet manifold should be avoided in my opinion, I certainly wouldn't use both at the same time.

    From the outside looking at the inlet manifold all you can see is what looks like a rather fat spark plug head with a wire attached, on the inside of the inlet manifold you would see a rather thick coil of wire which when energised gets red hot, thus heating the inlet combustion air to aide the starting combustion.

    Hope that helps, as I said in the other thread, to energise the plug if you have one could be either on the key switch or a separate button, normally what ever energises it would be a hold on type of operation so when you let go it goes off, hope that makes sense.

     
  6. adventure

    adventure Read Only Funster

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    On the older Mercedes you had a knob to pull to start the engine, if you pulled this 3/4 of the way up and held it there it would pre heat the glow plugs, afetr a minute or so you pulled it all the way and it should start from cold.

    Sorry if this is a repeat from the earlier post but there seems to be abit missing :RollEyes:

    nick
     
  7. AuldCodger

    AuldCodger Read Only Funster

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    Hi,
    Been driving Merc. Commercials for forty years and except for the days of frozen derv (imagine lighting a fire under your pride and joy, no not the missus ) they always start but as has been said DO NOT USE cold start, an engine killer, I would be surprised that it was still available
     
  8. chesterfield hooligan

    chesterfield hooligan Funster

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    :Smile: Hi a merry Christmas to everyone :Smile:
    Just to say why engines become addicted to 'easy start'. Is when the engine is started with it,it knocks on startup is because the 'easy start' ignights at a lower compression but gives a higher detionation knock which helps it start but shatters the top compression ring so that the engine needs another shot the next time ect untill you have to use it all the time
    yours Brian and Marion
     
  9. olley

    olley Funster

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    Can't agree with you guys, heard that story before but never found it to be true, the V8 perkies often needed a squirt in the cold weather but were fine in the summer, the RR diesels even had an easy start cartridge, you dropped it into a tube, screwed the lid on and as you did it punctured the cartridge, again fine in the summer, and RR diesels were crap.

    Never had much to do with van diesels so it might be true for them.

    Olley
     
  10. ruffingitsmoothly

    ruffingitsmoothly Read Only Funster

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    Hi Olley cannot agree more in fact the old Transits with the York engine used to have the same system you would charge it up and then use it for starting yet in summer they were fine, well. fine as them old diesels could be:Rofl1::Rofl1::Rofl1:

    Regards Pat
     
  11. Terence

    Terence Read Only Funster

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    508 cold start

    I owned a 508 for over ten years and my experience was 1/
    There are no Glow plugs because the engine is direct injectin 2/ The vehicle system is 12 volts other than the starter motor which is 24 volts and is operated via a great big solenoid under the drivers seat which switches the two batteries into series whilst the starter button is being pressed. As soon as the starter button is released and the engine is running the solenoid reverts to 12 volts and the batteries charge in the normal way with the alternator.
    The two batteries have to be in good nick and of equal power for the system to work.
    I did experience the contact screws working loose on the solenoid that impeded starting, other than that it never failed.
    Hope that has been of help.

    Terence

    PS If any one would like FOC a pre fuel filter glass and screw retaining clip I have one.
     
  12. Stephen & Jeannie

    Stephen & Jeannie Read Only Funster

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    I wonder ????

    Any "old timer " truckies remember lighting newspapers under the engine to warm the diesel up !!!

    I used to drive an AEC Mandator !!! What a bitch !!! :Rofl1::Rofl1::Rofl1:
     
  13. Heyupluv

    Heyupluv Read Only Funster

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    [ame="http://www.youtube.com/watch?v=VWqANVpJ1Ck"]OM314 - YouTube[/ame]

    [ame="http://www.youtube.com/watch?v=IexqLYrGvrg"]1975 Mercedes Benz 300D VERY Cold Start Winter W115 OM617 (-19F) - YouTube[/ame]

    [ame="http://www.youtube.com/watch?v=A6vwSvhJuiY"]om314 - YouTube[/ame]


    http://www.youtube.com/watch?NR=1&feature=endscreen&v=5sItU2rCPN0
     
    Last edited: Nov 30, 2012
  14. winand

    winand Read Only Funster

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    That second video is not an OM314 engine, but an OM615 or OM616 (which do have glow plugs)

    I now own my second MB508 bus with an OM314 "coldstarter" motor (so no glow plugs).
    When it's cold (below 0 Celc) then it's take little longer to start.
    Mercedes advises a thinner oil in there manual, but since 15W40 is the only (cheap) Mineral(!) oil available, almost every 508 owner uses this oil.
    Because this oil is much thicker when cold, starting can take up to say 6 attempts, each time you hear the motor turning a little faster, warminging up due to friction i guess.
    Also, When air is cold, it not as easy to compress, so keep that in mind to.

    Nothing to worry about, it always starts eventually.

    (and yes, try to STAY AWAY from start pilot sprays, it can damage your engine when used often!)
     
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  15. Snowbird

    Snowbird Funster Life Member

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    A little off topic but I was looking at some ex German ambulances built on the Merc 508d with between 1000 and 5000 kms from new. They were all in as new condition and for sale here in the UK by an ex MOD dealer at £3800. They would almost break for parts at that money but would make super self builds.
     
  16. scotjimland

    scotjimland Funster Life Member

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  17. Snowbird

    Snowbird Funster Life Member

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    Thats them Jim. Bomb proof mechanics and although elderly they are a steel at that money. Just wish I had the time to do a self build.
     
  18. jhorsf

    jhorsf Read Only Funster

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    Probably a lot better to do than an old VW
     
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  19. Snowbird

    Snowbird Funster Life Member

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    If you click on the "View full speck" button on Jims link it shows what they look like in civy paint.
     
  20. Terry

    Terry Funster

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    At just shy of £4800 inc vat you must be joking :Eeek: You would never get your money back :Eek!:Sure they are bomb proof engines but so are tractors -not quite wide enough too old :Doh: spares in another 5 / 10yrs ? bad now so god only knows about then -drove like slugs when new--- got to be committed to keeping it a long time-would you want one that long or get fed up?
    You could buy a newer 2005 ish model ambulance with a great shape for converting,better,faster and more mpg -and still a bomb proof engine - just leccys that let them down :BigGrin:
    terry
     
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