Water Pressure Gauge

Discussion in 'Outboard Maintenance' started by saltflyer, Jan 19, 2010.

  1. saltflyer

    saltflyer Well-Known Member

    93
    0
    331
    Has anyone ever installed a water pressure gauge on a 9.9hp or 15hp Yamaha 2-Stroke? Is there a capped off port already tapped?

    Thanks in advance for any assistance.
     
  2. Brett

    Brett > PRO STAFF <

    Last time I installed one,
    a tee had to be inserted into the whizzer tube line.
    The gauge was fed from the tee.
     

  3. saltflyer

    saltflyer Well-Known Member

    93
    0
    331
    Was it an accurate pressure reading?
     
  4. Gramps

    Gramps Living &amp; Dying in 3/4 Time

    2,558
    30
    903
    From the jobs I've seen they are all a little different.  In my opinion you should find a baseline or standard pressure (normal operation or after a new pump) and keep it eye on it past that .  I've seen guys use red sharpie or something similar to have an easy to reference point.

    Good luck!
     
  5. Brett

    Brett > PRO STAFF <

    Thinking back on an 8 year old installation is fun.
    I remember installing the tee so that the gauge hose
    was not in direct line with the hose feeding the tee.
    I also remember that the side of the tee feeding out
    to the whizzer was a smaller diameter than the other 2 inlets.
    My normal operating pressures were 6 to 8 psi.
    If it dropped below 4 when running I knew I'd picked up some weed.
     
  6. Un-shore

    Un-shore Well-Known Member

    I would agree, the smaller dia. whizzer causes back pressure against the gauge.

    I just don't understand what this has to do with drug deals? :-/
     
  7. devinmurray99

    devinmurray99 Well-Known Member

    107
    0
    341
    I was wondering the same for my 98' 50 hp Merc ELPTO. Is it already setup for a water pressure guage or do I have to do this type of mod. to make it happen?

    Also I am wondering if the external wires coming from the engine into the remote are related to this. Without looking I think they are blue, green, and brown. I need to find a manual for that remote to see what those are for. I plugged them in but they are dangling under the console.
     
  8. Brett

    Brett > PRO STAFF <

    The only thing electrical about the pressure gauges I installed was the night light.
    Everything else is mechanical. Rubber/plastic tube from the outboard to the gauge.

    http://www.diy-boat.com/index.php?option=com_content&task=view&id=151&Itemid=49
     
  9. Gramps

    Gramps Living &amp; Dying in 3/4 Time

    2,558
    30
    903
    More than likely that is for the tach.
     
  10. devinmurray99

    devinmurray99 Well-Known Member

    107
    0
    341
    Well the tach is hooked up and works fine. There are still 2-3 additional wires. I will post a photo to illustrate.

    So Brett...even on larger engines (150-250hp) the gauge is mechanical?

    Thanks for the info.
     
  11. Brett

    Brett > PRO STAFF <

    All the gauges I've used were mechanical.
    Installed on outboards from 25 to 175 hp.

    http://www.teleflexmarine.com/newgauges/faqs.html#5

     
  12. Weedy

    Weedy Well-Known Member

    817
    1
    393
    BigDev, what is the colors of the wires you are talking of?? All water pressure gauges are mechanical and the only thing on those gauges that use power is the light inside. There are some newer gauges that are power operated or assist, but they are on the newer computerized outboards.
     
Loading...
Similar Threads Forum Date
Suzuki DF30A Water Pressure Gauge Outboard Maintenance Aug 16, 2017
Merc 60 Water Pressure Outboard Maintenance Jul 3, 2017
Yamaha 70 Water Pressure Outboard Maintenance Jan 28, 2017
Suzuki DF60a Water pressure numbers? Outboard Maintenance Jan 27, 2017
Rule of thumb for water pressure Outboard Maintenance Jun 21, 2016