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TOPIC: Speedometer "frozen" at 25mph

Speedometer "frozen" at 25mph 19 Jun 2017 13:19 #1

  • GranTorinoSport
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Third time I've had my new VR5 out and the speedometer is frozen at about 24-25mph. The needle sticks when the power is off also.

Is this a fried speedo or is there something wrong with the pickup? Since it is consistently frozen when off as well I'm a little worried.

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2017 VR5

Speedometer "frozen" at 25mph 19 Jun 2017 14:02 #2

  • Download_Complete
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99% sure it's the pickup, it's a mechanical gauge and water pressure is the only way to measure speed. There is a pinhole in the leading edge of the gearcase that can and usually does get clogged with debris, pinning water pressure (and thus the gauge) in the tube.

Get an appropriately sized drill bit, and by hand, dig out this pinhole. It will likely go in about 3 - 4 inches or so.

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Matt Train
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Chicagoland, IL

Speedometer "frozen" at 25mph 19 Jun 2017 14:38 #3

  • 706jim
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I hit a stick with my B3 drive and the speedometer immediately stopped working. Boat out of the water and I tried probing the inlet to remove the wood splinter but no luck. Probably three seasons later, voila! speedo starts working normally again.

So my guess is that it is just debris in the pickup line and you either have to get it out of there or just wait like I did.

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2007 Discovery 246
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Welcome island Lake Superior

Speedometer "frozen" at 25mph 19 Jun 2017 14:58 #4

  • GetOverIt
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I suggest removing tube from back of speedo and see if there is water in the tube or signs thereof. The tube should never have water in it except maybe down at the pickup.
The speedo tube uses air pressure caused by water pressure, so in theory, as soon as you put it in the water, the tube should have a little air pressure that prevents water from reaching gauge.
If you get water in the tube up to the gauge, it may not be able to drain back out causing the gauge to read constant.
And water up to the gauge means you have an air leak in the tube.

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Greg

1997 Trophy 2002WA w/1999 Yamaha OX66 SX150TXRX
Vessel Name: Trynhooker

Speedometer "frozen" at 25mph 27 Jun 2017 11:46 #5

  • greebo
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Surely this is a warranty issue.
Talk to your dealer.

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Peter Walter-Smith
Riverport of Goolwa, South Australia
2014 Bayliner Element XL
115HP Mercury EFI

Speedometer "frozen" at 25mph 27 Jun 2017 13:44 #6

  • 6104696
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Download_Complete wrote: 99% sure it's the pickup, it's a mechanical gauge and water pressure is the only way to measure speed. There is a pinhole in the leading edge of the gearcase that can and usually does get clogged with debris, pinning water pressure (and thus the gauge) in the tube.

Get an appropriately sized drill bit, and by hand, dig out this pinhole. It will likely go in about 3 - 4 inches or so.


This^. It happened to my B3's and Alpha's several times when boating on a debris-filled river. I couldn't believe that wood could get wedged in that pitot hole tight enough to seal in the pressure, but it did. Disconnecting the plastic connector midway on the leg will relieve the pressure and let the speedo go to zero, but it might be best to start with the drill bit while there is still pressure in there......

(PS: It's not a warranty issue and your dealer will (should) charge you if you ask him to fix it, unless it's a speedo failure, which is highly doubtful)

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