Click for Dockmate Click for Walker Click for Cheoy Lee Click for Abeking Click for Lurssen

Cat 18 Acert white smoke when accelerating in neutral

Discussion in 'Engines' started by wally lopez, Dec 19, 2019.

You need to be registered and signed in to view this content.
  1. wally lopez

    wally lopez New Member

    Joined:
    Dec 19, 2019
    Messages:
    3
    Location:
    Puerto rico
    Cat 18 Acert is making white smoke at 1400 rpm and above when in neutral. All injectors are new. When you cut any two injectors the white smoke start to dissapear. Any thoughs on this issue, thanks
  2. Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    8,241
    Location:
    Satsuma, FL
    I assume the same issue before the new injectors.
    Stuck or broke exhaust valve.
  3. Capt J

    Capt J Senior Member

    Joined:
    Jul 11, 2005
    Messages:
    12,053
    Location:
    Fort Lauderdale
    How old are the aftercoolers, 1 could be starting to leak...….if over 6 years, change the aftercooler.
  4. Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    8,241
    Location:
    Satsuma, FL
    Another idea there also.
    What is happening; Either low compression or a wet with water lung is spitting raw fuel into the exhaust manifold. Some of that unburned fuel is ignited in the exhaust manifold by hot expanding exhaust gasses from other lungs.
    Stick your face in that smoke and your eyes will burn if it's fuel heavy, not so bad if it's steam.

    Don't mess around with this. You could drop a valve completely (if it's a valve) or bend a rod / blow the engine if water (from the A C).

    If it's never been over heated
    -- dock queen; valves.
    -- old and good use; A C.
  5. T.K.

    T.K. Senior Member

    Joined:
    Jan 31, 2007
    Messages:
    994
    Location:
    Cairo - Egypt
    How old are the engines and what are the operating hours?
  6. mapism

    mapism Member

    Joined:
    Aug 9, 2008
    Messages:
    429
    Location:
    Sardinia
    Do you mean ONLY in neutral? What happens under load?
  7. Fiammetta42

    Fiammetta42 Member

    Joined:
    Sep 28, 2017
    Messages:
    55
    Location:
    Cote d Azur
    Heats up things expand and the water leak self seals .......for now .

    sounds like water = intercoolers are timed out service parts .

    Worth checking the closed coolant levels when cold to eliminate that side .
  8. wally lopez

    wally lopez New Member

    Joined:
    Dec 19, 2019
    Messages:
    3
    Location:
    Puerto rico
    2015 with 300 hours
  9. wally lopez

    wally lopez New Member

    Joined:
    Dec 19, 2019
    Messages:
    3
    Location:
    Puerto rico
    When on load no white smoke
  10. rtrafford

    rtrafford Senior Member

    Joined:
    Jul 13, 2019
    Messages:
    419
    Location:
    Ft Lauderdale
    I had C-15's that did the same when cold. When the engines warmed up the exhaust cleared. White can also be fuel in these engines, although it's a very faint white blue.

    The question that was asked, regarding use and condition, is key here. Consider a cold start after a day or two benefitting from block heaters prior to start. I would think that if it was the after cooler the problem would persist no matter shutting down any injectors. Shutting down injectors will also have the computer doing backflips that will impact your effort to eliminate variables.

    Watch that #1 cylinder closely. It hates heat. When she gets to temperature use a heat gun to study temp consistencies from hole to hole and along the exhaust manifold.