Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › 450 diamond spool lag

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  • July 11, 2022 at 7:06 am #134066

    toolman
    Participant
    Vessel Name: Madijo
    Engines: 450 diamonds
    Location: westport wa
    Country: us

    I have a lag at 15 hundred to 17 hundred then it spools up, after coolers done this year, 2650 rpm, no black smoke, 38 tiara , was going to try your lazy aneroid but wanted to know how much adjustment, do not have an air supply to test, was going to trial after adjustment, how much adjustment? I can get an air supply but do not no that procedure?

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Viewing 6 replies - 1 through 6 (of 6 total)
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  • July 19, 2022 at 7:53 pm #134458

    toolman
    Participant
    Vessel Name: Madijo
    Engines: 450 diamonds
    Location: westport wa
    Country: us

    Heading to Westport WA this weekend , easy stuff first, Raycor , on engine fuel filter, new air cleaner, checking all turbo hoses and clamps, then 2 clicks on the aneroid and will reply next week and let everybody know the results, thanks everyone , Toolman Ted

    July 19, 2022 at 6:12 pm #134453

    Tony Athens
    Moderator
    Vessel Name: Local Banks
    Engines: QSB 6.7 550 HP
    Location: Oxnard, CA
    Country: USA

    2-3 clicks test one

    1 click each time after that

    Leave to top finger tight until you figure out if that was the issueĀ 

    Getting some “Black smoke” during transient acceleration try to get one plane isĀ  NORMAL &Ā  expected

    July 19, 2022 at 10:41 am #134431

    Ron Carter
    Participant
    Vessel Name: Sedona
    Engines: 6C8.3TA
    Location: SW Florida

    Toolman,

    Please let us know what happened if you adjusted the aneroid. One guy on the Club Sea Ray Forum backed off his spring tension by two clicks and said it fixed his slow spooling engine. I am down to that procedure because I have no other symptoms mentioned in Tony’s Tip on the lazy aneroid.

     

    And, Glendinning told me that if the synchronizer is off it is not possible to cause slow spooling because it is hard attached to the throttle cables when off.

    July 17, 2022 at 7:12 am #134313

    Ron Carter
    Participant
    Vessel Name: Sedona
    Engines: 6C8.3TA
    Location: SW Florida

    If this adjustment affects spool up with the sync off too that might explain the lack of smoke. IOW, not lack of air just not throttling up as fast as the other engine.

    July 16, 2022 at 2:38 pm #134294

    Dave Carlson
    Participant
    Vessel Name: Bec'n Me
    Engines: 500 QSC
    Location: Fort Myers
    Country: USA

    I had a 38 Tiara Open with this same issue. There is a friction adjustment in the synchronizer. I don’t remember if this problem was during sync off but there was some problem with cable adjustments too.

    July 15, 2022 at 9:53 am #134237

    Ron Carter
    Participant
    Vessel Name: Sedona
    Engines: 6C8.3TA
    Location: SW Florida

    If you will drop down three posts on this page you will find my post on the same issue. I have not received an answer here about what to check aside from Tony’s low power tip. My filters are all clean, the turbo spins freely and my injectors are a year old. WOT, like yours, is not affected.

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