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Thread: LN106 hard starting: ideas?

  1. #1
    By Popular Demand gimp's Avatar
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    LN106 hard starting: ideas?

    '94 LN106 with 150k km, previously started first crank every time, today and yesterday I've had to turn it over for a few seconds before it'll fire up. Glow plug relay is clicking on and off, glow plug rail getting power (test light). Doesn't cough and splutter for the first couple of seconds of cranking. I think it's a fuel issue but there aren't any visible leaks from any lines/filter/pump. Diesel filter was clean. Runs and idles fine once going. Ideas?

    Local mechanics didn't bolt the diesel filter/primer pump back onto the studs when they reinstalled it after swapping a brake line the other day and I only noticed today so it's been rattling around loose on the studs, but I don't really see how that could be a problem (never trust the professionals).

  2. #2
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    clean out the intercooler. i soaked mine with turps then supercheap degreasing spray. let it properly dry.
    solved a similar issue on our triton

  3. #3
    By Popular Demand gimp's Avatar
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    No intercooler. Naturally aspirated 3L.

  4. #4
    Member norsk's Avatar
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    Are your batteries in good nick and you are sure the engine is being spun fast enough?

    No leaks around the filter or priming pump letting air into the system?After your last experiance with the local mechanics I would be be concentrating on this area.

    maybe they took the priming pump off and lost the copper washer?

    Just because you have power on the rack,does not mean one or more glow plugs are not getting sad.Take them out and check.

    IF non of that works just sell it to me please.
    xtightg likes this.
    "Sixty percent of the time,it works every time"

  5. #5
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    It was all good till it got "messed-with"..I would definitely start "there". Did they disconnect any fuel-lines when they unbolted the filter/primer ? They can "pull air", without leaking. Rigid fuel-lines can hair-line-crack, right in behind the threaded-collar, from the kind of vibration that "left-hanging" would have produced..and another possibility is the hand-pump-seal is compromised.(the pump itself,not the can-seal) They can fail out of the blue. I would take it back and make them remedy it, pointing out their crap work

  6. #6
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    Wow that could be the last ln106 in the entire country with only 150 clicks on it, barely run in.
    veitnamcam likes this.

  7. #7
    Member northdude's Avatar
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    start with the simple stuff first before starting it in the morning pump the fuel primer till it goes hard and see if that does it if still the same take the glow plugs out and test them on a battery one at a time
    7mmsaum, Beaker and xtightg like this.

  8. #8
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    Lol yeah low kms 106 , anyway if it’s cranking ok you have air supply to check,glow plugs to check ( take out and check)
    Also glow time should be at least 10 secs if not there’s a few things to check
    Then you have fuel supply, main issue with that age is primer seals leaking allowing fuel to flow back to tank (which I believe you had on cruiser)

  9. #9
    By Popular Demand gimp's Avatar
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    Will take plugs out and test, and try priming til hard before starting.

    It starts fine first crank once it's been run so it's either an air leak in the fuel system somewhere or glow.

    It's off a dry stock stud farm in the Wairarapa and k's are legit as far as I can tell from service records etc, mostly everything was mint (til my local mechanic touched it).

  10. #10
    Member ROKTOY's Avatar
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    I'd start with the fuel filter/primer as Norsk stated, ensure the filter is still on firmly and that the seal isn't leaking (may have vibrated loose from hanging free for a few days), check the hose clamps on fuel filter are snug check hoses to and from filter for wet spots indicating a hole/leak.
    pump until firm then try starting. If no go then try again but glow twice before starting (if this works it indicates the glow plugs are not working correctly and it may be time to replace them, also check the metal rail that connects the glow plugs is bolted onto the glows firmly.
    Does it puff out any smoke as you crank it? this may indicate unburnt fuel.
    xtightg likes this.

  11. #11
    By Popular Demand gimp's Avatar
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    No smoke, tried glowing twice with no difference. Strongly suspect air leak in fuel but was a bit lost for where to track it down.

  12. #12
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    LN106 hard starting: ideas?

    Fuel primer leak on them and suck air - pretty sure they can be by passed easy as to check the problem, glow plugs need to be pulled and checked
    Take it to Brad @ Gray Mechanical Southside of the bridge


    Sent from my iPhone using Tapatalk
    7mmsaum likes this.
    Dont waste your time chasing every last fps, it doesnt matter in the real world, it wont make a difference, all it will do is cause head aches and frustrations. And dont listen to silly old cunts

  13. #13
    Member Driverman's Avatar
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    Bleed your injectors . With the engine running crack the feed line at the injecter which will spurt a little then retighten.

  14. #14
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    I'm no mechanic, but I would think if it was air getting in it would run lake a bag of s...t.
    I had an old Fiat tractor which sounded tired when cranking. Auto sparky put a relay somewhere (I'm no sparky either). I think he said it boosted the power to the starter. Fixed it.
    Overkill is still dead.

  15. #15
    Member northdude's Avatar
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    The valve in the primer pump craps out and fuel drains off over night back to the tank just do the simple stuff first rotary injector pumps are self bleeding

 

 

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