Speedometer Stopped Working????

Discussion in 'Powerboats' started by BMcAustin, Jul 4, 2005.

  1. mediator
    Joined: Dec 2010
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    Location: Panama

    mediator Junior Member

    Another shot of the engine.

    3rd view of motor.jpg
     
  2. PAR
    Joined: Nov 2003
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    Location: Eustis, FL

    PAR Yacht Designer/Builder

    [​IMG]

    Does your gauge look like #1?
     
  3. CDK
    Joined: Aug 2007
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    Location: Adriatic sea

    CDK retired engineer

    This concerns an Alpha-1 2nd generation.

    There is a very small triangular cut at the back of the lower housing, serving as a "Pitot tube" for the speedometer. The vacuum passes two gaskets and a short piece of plastic hose to arrive at the transom inner housing, where the vacuum line to the speedometer is connected at a barb fitting.

    That is the place for things to go wrong. It is a tiny piece of brass just above the incoming water hose under the steering lever; the vacuum line is just pushed on with no space for a hose clip, so it easily pops off.
     
  4. mediator
    Joined: Dec 2010
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    Location: Panama

    mediator Junior Member

    Thanks but none of the gauges look like my speedo gauges these look like tacs.
     
  5. WickedGood

    WickedGood Guest

    Its the little Hole on the front edge of your Outdrive. You will find a usually black plastic 1/8" tube that is connected inside.

    If you removed the lower unit for service the tube most lilky disconnected.


    PAR. Would you have an extra Speedomet Gage that you want to get rid of, I have a pitot pickup hanging around and would not mind adding a gagspeedo to my boat for Trolling Speed.


    Maybe I can trade you some Johnso/Everude parts?
    I Have lots of them. http://**********************/index_files/Page470.htm

    Capt Walt
     
  6. mediator
    Joined: Dec 2010
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    Location: Panama

    mediator Junior Member

    I think it is just clogged, I am in Panama and there has been so much flooding here the canal looks like melted chocolate lots of dirt in the Canal. It had been working until I took it into the ocean thats when I noticed it wasnt working so I think the hole is clogged and will try and clean it. Sorry no extra speedometers with me. Hope you were joking.
     
  7. sparky_wap
    Joined: Mar 2008
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    Location: Suffolk, VA USA

    sparky_wap Junior Member

    Alpha drive

    A buddy has an alpha drive like yours. The leading edge of the lower vertical section has a small hole which clogs up. It might easy be to flush this out from the line off the back of the gauge. Easy on the pressure, you don't want to blow off the small hose in the drive leg. Worst case, you could add a transom pitot tube pictured earlier in the thread and bypass the factory pick-up. I'm not sure how much water would get into the boat at speed if the old line suddenly cleared and was not plugged.
     
  8. Anasazi
    Joined: Jan 2011
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    Anasazi New Member

    With the drive tilted all the way up, if you peak in near the bellows you you should see a speedo hose coming from the transom assembly. It has a quick connect fitting. This slips over a male fitting on the lower unit near the large front horizontal zinc plate. You can easily disconnect there if necessary.

    You might try carefully working a small diameter drill bit by hand to clear the speedo hole. I think you've already located it now a few inches above the bullet in the leading edge of your alpha gen II lower unit, right?

    If you can't detect a blockage in the pickup hole, make sure the tube is clear and if still no go, see if the speedo moves with a gentle blow of air into the hose.
     

    Attached Files:


  9. mediator
    Joined: Dec 2010
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    Location: Panama

    mediator Junior Member

    This was a tremendous help where did you find this picture. Makes a lot more sense now.
     
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