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Gadgetry

Discussion in 'Diesel Engines/Drives/Transmissions/Props' started by jmcdboater, Oct 9, 2022.

  1. Oct 9, 2022 #1
    jmcdboater

    jmcdboater Active Member

    323
    May 28, 2022
    Stockton, CA
    1988 300 DA Sundancer
    Vessel JIM’N’I IV
    Twin 5.7L Mercs w/Alpha One Drives
    Koehler KVA 4 Genset
    Question for the group….so a Mechanic is on the boat, mains rumbling in idle, one of the tacks is reading 600-700, right where I want it. The other tach is reading 1000-1100, but the engine does not sound any different(faster idle) and the synchronizer is reading 12 o’clock…dead even. So the mechanic whips out a small gadget, walkie-talkie sized, with an pull-out antennae, and says….”yep dead on, 650 rpms”.
    So two things…..obviously I have a bad tach, and what was the thing he had (I didn’t even think to ask him, duuuuh), I want one!
     
  2. Oct 10, 2022 #2
    Stee6043

    Stee6043 Well-Known Member

    5,823
    Jun 1, 2015
    West Michigan
    1997 Sundancer 400
    7.4L Gassers
    You may not have a bad tach - it might just need a little love. Some folks can resolve this issue by simply pulling the tach, switch the "cylinder select" selector back and for a few times. Reinstall and see if that does the trick.
     
    jmcdboater and Nepenthe like this.
  3. Oct 10, 2022 #3
    The Bill Collector

    The Bill Collector Well-Known Member GOLD Sponsor

    4,841
    Jun 2, 2008
    Tacoma, WA
    1998 450 Sundancer, Achilles dinghy w/15hp
    3126 Cat's
    Above and also pull the wires off, emery board the connections, apply dielectric grease and reinstall. I have done this successfully...
     
    jmcdboater and Mauler34Rod like this.
  4. Oct 10, 2022 #4
    Phil S

    Phil S Well-Known Member

    1,998
    Oct 16, 2020
    Taxachusetts
    Former 2004 300DA
    5.0 MPIs and Bravo IIIs
    New boat incoming
    Sundolphin 9-foot Tender
    9.9hp Mercury OB
    No one has any ideas on the gadget ?????

    I wonder if that's some kinda novelty thing. I want one!!!!

    Then when the wife says: I think the ___________ is acting up. You pull out the box, adjust the antenna, push a few buttons, then go "no it's fine"
     
    Mjresq4 likes this.
  5. Oct 10, 2022 #5
    jmcdboater

    jmcdboater Active Member

    323
    May 28, 2022
    Stockton, CA
    1988 300 DA Sundancer
    Vessel JIM’N’I IV
    Twin 5.7L Mercs w/Alpha One Drives
    Koehler KVA 4 Genset
    Maybe I’ll need to call the mechanic back and ask him, a little walkie-talkie sized gadget to read rpm’s….I imagine it was reading the the cycling of the distributor??? I would like to have one……who knows what it is???
     
  6. Oct 10, 2022 #6
    The Bill Collector

    The Bill Collector Well-Known Member GOLD Sponsor

    4,841
    Jun 2, 2008
    Tacoma, WA
    1998 450 Sundancer, Achilles dinghy w/15hp
    3126 Cat's

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