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  1. #1
    Dave Fellowes's Avatar
    Dave Fellowes Guest

    Default "I currently looking at purcha

    "I currently looking at purchasing a vessel with twin 6BTA5.9 engines. These engines have 963 hrs each on the clock, no noises - appear to be in good condition.
    Question is, after starting the engines (2-3sec wind)and run for approx 15 min, both engine exhausts were still fuming. Did not appear to be oil coloured smoke - more fuel looking. Engine temperature at this stage was approx 50 C, oil pressure 65 psi. Is this normal for these engines to be like this at this temperature and then clear as reach operating temp or should they burn clear after initial start. Have not had the opportunity to take vessel for a run yet - hoping to arm myself with some knowledge prior.
    Any assistance on this matter would be appreciated."

  2. #2
    Herb Ebel's Avatar
    Herb Ebel Guest

    Default I am looking to purchase a Bay

    I am looking to purchase a Bayliner 3988 with 6BTA5.9M2 four cylinder Cummins. I have heard that this engine is under powered for the boat and if ran too hard it tends to blow the injectors. My mechanic says blow injectors generally lead to rebuilding the engine. Any feedback from current owners or mechanics with experience would be appreciated.

  3. #3
    Dave Carnes's Avatar
    Dave Carnes Guest

    Default Dave: I have a similar engine

    Dave: I have a similar engine with the same number of hours. I have the same smoking problem. From folks that I have talked to this is characteristic of the engine. Raw water pumps seem to be a problem. I bought the boat used and put a new pump in since it had a leak. In less that 200 hours the pump was leaking again. Cummins was not nice about backing for a new pump.}

  4. #4
    Dennis Logan's Avatar
    Dennis Logan Guest

    Default "I have 6BTA5.9 engines with 1

    "I have 6BTA5.9 engines with 1,000 hrs and they both smoke when cold. I spoke with a cummins mechanic and was told this is normal."

  5. #5
    Join Date
    Oct 2006
    Location
    Mt. Airy, MD, USA
    Posts
    2

    Default "We also have 6BTA5.9 engines,

    "We also have 6BTA5.9 engines, we have about 600 hrs and they do both smoke when cold. We have had this boat for a year now and have had no problems."

  6. #6
    Matt Daniel's Avatar
    Matt Daniel Guest

    Default Could anyone advise me as to t

    Could anyone advise me as to the best practices for breaking in a new 6BTA5.9M2?

  7. #7
    Join Date
    Feb 2006
    Location
    Arlington, VA, USA
    Posts
    952

    Default "You guys should start a new p

    "You guys should start a new post with each topic, btw."

  8. #8

    Default Re: Cummins 6BTA59 M2

    Run it in (hard) when new or rebuilt. Stop frequently and check for leaks and normal things.

  9. #9
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    4,567

    Default Re: Cummins 6BTA59 M2

    Did you realize that you commented on a post that started 8 years ago? The most current post was 6 years ago.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

  10. #10

    Default Re: Cummins 6BTA59 M2

    I can supply all cummins parts.
    Welcome to consult www.chinamarineparts.com

  11. #11
    Join Date
    Sep 2015
    Location
    CA
    Posts
    74

    Default Re: Cummins 6BTA59 M2

    Pretty popular engine and useful for small to mid-range applications. Hope you found the unit

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