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Cummins Valve Adjustment - how do you rotate engine?-gctid778517

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    Cummins Valve Adjustment - how do you rotate engine?-gctid778517

    So been looking at the next adjustment I need to make on my 4BTA's - make sure the intake and exhaust valves are in spec. 1200 hours on the engines and I have no record of this work ever being done.

    Found this great video on how to adjust them: https://www.youtube.com/watch?v=lbZuUn_nqnc

    But -- he's got an engine sitting on a stand and it's simple to rotate. So, what's the trick to rotating the engine with boat in the water and full compression? Flywheel? Alternator?
    Terry
    1999 Bayliner 3388
    Twin Cummins 4BTA
    Fisherman, Cruiser, Boaticus-enthusiasticus-maximus
    Member Royal Victoria Yacht Club

    #2
    Socket wrench on alternator works fine.
    "Impasse". 2001 3988
    Cummins 330's
    Puget Sound

    "You don't want to be the richest guy in the nursing home..."

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      #3
      Turn the socket clockwise, ( engine runs counter clockwise when viewed from fly wheel end at the stern) compression dissipates as you turn slowly, and adjust valves when the engine is cold. Socket might be 15/16?
      "Impasse". 2001 3988
      Cummins 330's
      Puget Sound

      "You don't want to be the richest guy in the nursing home..."

      Comment


        #4
        Yes, alternator nut. Much easier with 2 on the job!
        1997 3788/Cummins 6BTA 5.9 M2s (Sold)
        2003 Silverton 42c/Cummins 480CEs
        2014 Sea Fox 22 Center Console
        2006 Boston Whaler 13 Sport

        Vero Beach, Fl.

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          #5
          When I adjusted the valves on my 6B's, I used the Cummins "barring" tool. Basically a gear like the starter drive with a 1/2 ratchet square hole. It is placed in the bellhousing to the flywheel on the port side of the engine.


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