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3406 E... FUEL in OIL.. Help please ??

Discussion in 'Trucks [ Eighteen Wheelers ]' started by MOPHEAD, Feb 29, 2008.

  1. Feb 29, 2008 #1
    MOPHEAD

    MOPHEAD Bobtail Member

    2
    0
    Feb 29, 2008
    Bethany Beach, DE
    0
    keep getting fuel into oil
    changed o-rings, #1 injector was loose, #3 injector seemed to be leaking fuel at the top , transfer pump was checked, ran the rack. and relpaced
    all injector hold down bolts.. what else could it be ??
     
    MOPHEAD, Feb 29, 2008
    MOPHEAD, Feb 29, 2008
    #1
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  3. Mar 1, 2008 #2
    motorbreath76

    motorbreath76 Bobtail Member

    1
    0
    Mar 1, 2008
    Statesboro, ga.
    0
    man all i can tell you is i had the same problem with a 98 fr8shkrand ended up replacing all the injectors b4 the problem was fixed. then i got rid of the truck.:O_o_1PIRATES29:
     
    motorbreath76, Mar 1, 2008
    motorbreath76, Mar 1, 2008
    #2
  4. Mar 1, 2008 #3
    sandman

    sandman Light Load Member

    97
    9
    Nov 3, 2007
    here or there
    0
    sounds like the injectors to me.
     
    sandman, Mar 1, 2008
    sandman, Mar 1, 2008
    #3
  5. Mar 3, 2008 #4
    550hpW900L

    550hpW900L Road Train Member

    1,874
    1,090
    Jan 29, 2008
    norcal
    0
    One or more injectors is dumping fuel, its seeping pass the rings and getting into the oil. Did you run a injector cut out test? If so i suggest you hook it up to a computer and do it, it should show a bad leaky injector. Its simple takes 5 minutes to do and its cheap.
     
    550hpW900L, Mar 3, 2008
    550hpW900L, Mar 3, 2008
    #4
  7. Mar 4, 2008 #5
    MOPHEAD

    MOPHEAD Bobtail Member

    2
    0
    Feb 29, 2008
    Bethany Beach, DE
    0
    thanks drivers

    seemed to have slowed the leak ( i hope ) #1 injector was jumping up and down tightened it down with new bolts.
    ran a dye test and seem some fuel around #3 injector replaced #3
    replaced all hold down bolts for the injectors, o-rings
    did oil change and filter
    left the oil level a gallon low. ran a light load with it approx. 500 miles
    checked oil level and it was up 1/2 gallon.
    could that be left over fuel in the engine or do you think i still have another injector leaking
    #3 seemed to be leaking from the spring at the top
    550 .....do you mean the injector o rings ??
     
    MOPHEAD, Mar 4, 2008
    MOPHEAD, Mar 4, 2008
    #5
  8. Mar 4, 2008 #6
    Badcable

    Badcable Medium Load Member

    356
    191
    Feb 1, 2008
    Outside Chicago, IL
    0
    Mophead,

    From what I'm reading it sounds like 550hpW900L is referring to the piston rings themselves. Fuel seeping down past the rings is definitely possible (and it would be straight down into the oil pan) depending on how much fuel is leaking out between cycles.

    I agree with 550hpW900L, an injector cutout test would identify anything even remotely faulty. There is a manufacturer spec on acceptable leakage (usually very low, if any) and if one of your injectors is pushing the limit you'll know.
     
    Badcable, Mar 4, 2008
    Badcable, Mar 4, 2008
    #6
  9. Mar 6, 2008 #7
    550hpW900L

    550hpW900L Road Train Member

    1,874
    1,090
    Jan 29, 2008
    norcal
    0
    No not the O-rings but the piston rings, a injector itself could fail and its just leaking fuel in the cylinder, if you get to much it will seep pass the rings washing out the cylinder sometimes which is not good.
    I suggest going to a dealer or someone with a laptop and CAT software and do a cut out test it will show a bad leaky injector.
     
    550hpW900L, Mar 6, 2008
    550hpW900L, Mar 6, 2008
    #7
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