speedo issue 2005 sundeck

Discussion in 'Announcements & FAQs' started by Dexter567, May 28, 2015.

  1. Dexter567

    Dexter567 New Member

    1
    May 28, 2015
    Hudson Valley
    Searay 2005 240 sundeck
    Merc 5.0
    My speedometer is not registering correctly. I have recently had my out drive replaced and ever since this was done my speedo works but it show I'm going half as fast as I really am. Anyone with info on this?
     
  2. BillK2632

    BillK2632 Well-Known Member SILVER Sponsor

    Jun 25, 2009
    Lake Norman, NC
    1999 185 Bowrider,
    Mercruiser 4.3, Alpha I
    The analog speedometer gets its reading from airpressure through a pickup hose connected to the outdrive.

    A couple of things to check:
    1. The speedometer pickup hose connects to the outdrive with a quick connect located just behind the front drive anode (the big flat one). Make sure the hose is connected correctly. I always forget about mind when removing the drive and it pulls off the quick connect fitting.

    2. There is a small hole on the leading edge of the drive (about an inch above the "cone" in front of the propeller. This hole can get clogged with debris, use a small wire or drill bit to ream out the hole. (don't use a drill, do it by hand).

    3. Check the connection under the dash where the speedometer hose connects to the gauge.
     
    Last edited: May 28, 2015
  3. JimG

    JimG Well-Known Member SILVER Sponsor

    Nov 4, 2008
    Southern WV
    2007 310 DA
    Kohler 5ECD
    Twin 350 Mags
    Raw Water Cooled
    V-Drives
    BillK2632 is spot on with his advice...

    Welcome to CSR!
     
  4. jason78

    jason78 Active Member TECHNICAL Contributor SILVER Sponsor

    Sep 3, 2008
    Fort Mill, SC / Lake Wylie
    1997 20 Outrage
    200 Merc Offshore
    Just to add to the good advice already given: In this case, with a 2005 Sundeck, it is highly likely he has Smartcraft gauges. If he does indeed have Smartcraft, the pitot hose would connect to a Smartcraft pitot sensor mounted on the top of the engine on the inside of one of the risers rather than extend all the way to the gauge. I suspect that the hose was not connected back up properly when the new drive was installed or there is a clog in the hole.
     

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