Announcement

Collapse
No announcement yet.

bouncing tachometer?-gctid825068

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

    bouncing tachometer?-gctid825068

    We just came back from a three week trip and part way through the port tach started bouncing all over the place. There seemed no rhythm or reason as to why.The only thing I noticed was that it didn't start bouncing when I started the motor but after the engine was running for a while..also some time it would suddenly stop jumping around and read fine. I wonder if there is a sensor someplace that may need replacing? any ideas?

    thanks

    #2
    Loose wire connection, probably behind the gauge itself.
    Dave
    Edmonds, WA
    "THE FIX"
    '93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
    (.030 over-Vortec top end-part closed cooled)
    The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
    Misc. projects thread
    https://www.baylinerownersclub.org/f...56-gctid789773

    Comment


      #3
      Check for corrosion on the wire at the sender.
      "Impasse". 2001 3988
      Cummins 330's
      Puget Sound

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

      Comment


        #4
        I've got 4 tachs jumping all over the place. If you can, swap wires and put your starboard wires on your port tach. If the wires wont reach use some jumper wires and see what happens to your port tach. I've been in touch with Faria Instruments and one of their engineers said maybe my tachs are just old and warn out.
        Dan
        Frostbite Falls, Minnesota
        Claudia V. III
        1988 - 3218
        Gas Drives

        Comment


          #5
          Sometime by cycling the cylinder selector on the back between 4/6/8 a few time corrects this.
          1997 Maxum 2400 SCR 5.7LX Bravo II

          Mike

          Comment


            #6
            I don't know what boat, or engines you have,,, (filling out your profile page would solve that problem) however if you have one of those multi pin electrical connectors going to your engines, try the wiggle and tug method to see if there are bad connections. Corrosion can be a cause of that too. This is in addition to the other suggestions already given.

            Greg
            Newport, Oregon
            South Beach Marina
            1986 3270 with twin 110 HP Hino diesels. Name of boat "Mr. Darcy"
            Past work history: Prototyping, tooling, and repair for Reinell,. General fiberglass boat repair starting in 1976.
            Also worked as heavy equipment mechanic, and machinery mechanic for over 30 years.

            Comment


              #7
              Mine was doing that for a while. Sprayed the wire connections and the rear of the tach with electronic parts cleaner. Also sprayed the plug connection on the coil. Eventually the tach quit completely. New Faria tach on eBay was $95. If it's out of warranty, Faria wants $100 to repair it. Cheaper just to buy new.
              1990 2755 - sold
              2005 275 current vessel

              Comment


                #8
                "Nauti Mike" post=825094 wrote:
                Sometime by cycling the cylinder selector on the back between 4/6/8 a few time corrects this.
                correct...

                I just fixed my upper tach doing this.


                NU LIBERTE'
                Salem, OR

                1989 Bayliner 2556 Convertible
                5.7 OMC Cobra - 15.5x11 prop
                N2K equipped throughout..
                2014 Ram 3500 crew cab, 6.7 Cummins
                2007 M-3705 SLC weekend warrior, 5th wheel
                '04 Polaris Sportsman 700 -- '05 Polaris Sportsman 500 HO
                Heavy Equipment Repair and Specialty Welding

                Comment


                  #9
                  where is the cylinder selector located? Is it on the back of the tach itself?....checked wire connections and they all seemed good

                  Comment


                    #10
                    "bcarli1111" post=826281 wrote:
                    where is the cylinder selector located? Is it on the back of the tach itself?....checked wire connections and they all seemed good
                    Yes on the backside of the tach.
                    1997 Maxum 2400 SCR 5.7LX Bravo II

                    Mike

                    Comment


                      #11
                      found the cylinder selector on the back of the tach. It doesn't seem to be adjustable from the back. Do I have to remove the tach to switch through the different cylinder settings? There is an indent in the tach next to the cylinder selector that looks like a colored wheel? I haven't forced it...so what is the correct way to change the cylinder setting?
                      thanks

                      Comment


                      • Nauti_Mike
                        Nauti_Mike commented
                        Editing a comment
                        Post a picture. Typically you use a small flat blade screwdriver to turn the selector.

                      #12
                      My starboard tach bounces on upper and lower helms consistantly but generally once it is warmed up, not usually when cold or during the warm-up. I think it might be a damaged wire in an awkward location but I have to track it down to confirm it...
                      1995 Bayliner 3587
                      Twin Hino 250HP
                      Located In Sidney BC, Canada

                      Comment


                        #13
                        Mine were jumping as well. No rhyme or reason to it. I pulled the face dash board to gain access to the back side and removed the plug from each and cleaned with wire bush the contacts and the plug sockets with qtip and alcohol and put it back together and they work great. Steady and true. Bal734 told me to do this and he was dead on...
                        Guntar
                        1999 3988
                        Cummins 270s

                        Comment

                        Working...
                        X