speedo issue 2005 sundeck

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

  1. Dexter567

    Dexter567 New Member

    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
    BillK2632 is spot on with his advice...

    Welcome to CSR!
  4. jason78

    jason78 Active Member TECHNICAL Contributor

    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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