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Cat 18 Acert white smoke when accelerating in neutral

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

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  1. wally lopez

    wally lopez New Member

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    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

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    I assume the same issue before the new injectors.
    Stuck or broke exhaust valve.
  3. Capt J

    Capt J Senior Member

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    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

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    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

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    How old are the engines and what are the operating hours?
  6. mapism

    mapism Senior Member

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    Do you mean ONLY in neutral? What happens under load?
  7. Fiammetta42

    Fiammetta42 Member

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    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

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    2015 with 300 hours
  9. wally lopez

    wally lopez New Member

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    When on load no white smoke
  10. rtrafford

    rtrafford Senior Member

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    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.