speedo issue 2005 sundeck

Dexter567

New Member
May 28, 2015
1
Hudson Valley
Boat Info
Searay 2005 240 sundeck
Engines
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?
 
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:
BillK2632 is spot on with his advice...

Welcome to CSR!
 
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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