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 Catalina/Capri 25/250 Sailor's Forums
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 Slow speedometer		  New Topic  Topic Locked
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Bruce Baker
Captain

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USA
402 Posts
Initially Posted - 05/16/2007 :  07:23:34  Show Profile
My speedometer registers between 1-2 knots, even when motoring along at 5 knots. Any ideas what might be the problem? I've got the original equipment (Signet / Standard Horizon) setup. Can the impeller be removed while the boat is in the water? I've never tried this move.
Bruce Baker
Falls Church, VA
"Yee Ha" 3573
'83SR/SK
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 05/16/2007 :  08:03:02  Show Profile
Bruce,

You might have a fouled impeller or even a paddlewheel with a few broken/missing paddles.

Yes, you can remove the unit while it is in the water. My SR transducer has a plug that is inserted after the removing the transducer. The first time I remove it I was a little apprehensive with thoughts of geysers and Three Stooges type antics, but it was pretty much a non-event.
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tinob
Master Marine Consultant

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USA
1883 Posts
Response Posted - 05/16/2007 :  08:10:00  Show Profile
Bruce,

Sounds like you have an impeller that is fouled, happens to me once or twice a summer. I have the same unit that you described and it came with a plug that replaces the sending unit. It's a little scary the first time you try to use it but in time you get used to it.
I keep a small bucket and sponge handy when I do this. Trick is to have everything handy and do a mental runthrough rather than just jumping in. Thing is to have the plug at hand, then as you unscrew the sending unit and pull it out imediately place your hand over the onrushing water. With your free hand ready the plug and remove your hand while simultaneously fitting the plug. take an old toothbrush and scrub the impeller claen. There is a tiny shaft that comes out allowing the trough that the impeller sits in to be cleaned, be sure to replace the impeller in the same direction that it came out in. Don't clean up yet when you replace the sending unit it starts all over again.

Have at it and good luck.

Val on CALISTA # 3936, Patchogue, N.Y.
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Champipple
Master Marine Consultant

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USA
6855 Posts
Response Posted - 05/16/2007 :  13:05:55  Show Profile  Visit Champipple's Homepage
if it goes 2 when you go 5 it sounds like you just need to go about 15 to get the results you are looking for
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Bubba
Admiral

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USA
542 Posts
Response Posted - 05/16/2007 :  18:54:09  Show Profile
Maybe it's set for leagues per hour! Let's see... 1-2 leagues would be 3-6 knots.
Sounds about right.
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ed_spengeman
1st Mate

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USA
98 Posts
Response Posted - 05/21/2007 :  11:16:11  Show Profile
Just had the same problem. Got a new gauge last year and it worked fine. This season, it was showing about 2 knots for full speed with motor. Called company and they told me how to adjust.

First make sure send is ok and spinning. If you push the button on the face you will see it say cabrate. you have to set a factor to increase it or decrease it. I used a gps to get actual speed over ground. I set mine for a factor of about +1.2. I kept changing factors until I matched the gps. Works fine now. Instructions can be downloaded off Signet site.

Good luck.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.