imanikin
27.05.2021 0:14:05
Moss, algae, marine growth in general, will plug up the tube in the lower unit. here
See full version: How do you clean out a speedometer pitot
Moss, algae, marine growth in general, will plug up the tube in the lower unit. here
I cant get what ever is in the foot of the OB unclogged.
My speedo didn't work until I cut a kink out of the tube I found.
I've found the cheap Wally World carb cleaner to work well to kill the vegetation and sterilize the tube, a shot of compressed air blown back thru the tube from the butt connector usually clears the tube. here
Re: How do you clean out a speedometer pitot?
If you do not find any holes or cuts on the tube or the pitot tube, you then need to check the speedometer itself. Disconnect the tube on the pitot tube or outdoor motor. Blow air into the tube for about 10 seconds. Ask someone to look at the speedometer for you while doing this.
The cause of malfunction may also be due to a damage pitot tube. Check if the pitot tube has any holes or is damaged. If it is, replace it with a new one.
If your boat’s speedometer is not working properly, then it is time to make some basic repairs to your speedometer. However, before you start pulling wires, it is important that you check what is causing the boat’s speedometer to malfunction.
Check to see if there are any holes or cuts on the tubes. If you do find holes on the tube, all you need to do is replace the damaged tube with a new tube. Make sure that you have the same length as the old tube. It is advisable to bring the old tube when you buy the new one so you can get the same specifications.
A minor boat repair often includes repairing paint chips, repainting some parts of the boat, or fixing your speedometer. Fixing your speedometer is a minor repair. However, if not immediately fixed, your boat can be in for a lot more trouble than you can imagine. In this regard, it is important that you know how to fix your boat’s speedometer.
When checking for the cause of the malfunction, you need to locate the tube of the speedometer. You will generally find this under the dashboard of your boat up to the center of the speedometer’s back. You can easily recognize the speedometer’s tube because it is thicker than most wiring in the boat, and it is often colored black.
If your speedometer tube connects to the lower unit of your outboard motor, open the case of your motor's lower unit and visually inspect the tube for cuts, breaks, holes or kinks. If any are present, replace the speedometer tube. [links]
Look under your boat's dashboard and find the tube running from the center of the back of the speedometer. The tube probably will be black plastic and thicker than most boat wiring. Trace the speedometer tube to the back of the boat, where it will connect either to a pitot tube under the transom or to the lower unit of the outboard motor. Inspect the length of the tube for holes, cuts, kinks or wire ties that visibly pinch the tube. If the tube is cut or has a hole, replace the tube. If a wire tie is pinching the tube, remove and replace the wire tie, making sure not to pinch the tube. more
Tell your assistant to watch the speedometer and let you know if the needle moves, then blow into the tube for 10 seconds. It takes very little breath to make the needle move as high as 5 mph. [links]
The most common type of boat speedometer has a tube (called a pitot tube) that runs to the back of the transom, or through the lower unit of the outboard motor. When the boat is in motion, water flows into this tube, compressing the air in the tube. As the air in the tube is compressed, it moves the needle on the speedometer, much like the needle on a blood pressure cuff. The most common cause of speedometer failure is a plugged pitot tube.
Disconnect the speedometer tube from the pitot tube or lower unit, either by releasing the quick-connect joint to the motor or by using the screwdriver to unscrew the connector at the pitot tube. Inspect the pitot tube for breaks or holes; if any are present, replace the pitot tube.
If the needle does not move when you blow through the tube, disconnect the tube from the back of the speedometer (it should simply pull off) and use a compressor--at a very low pressure, under 10 psi--to blow any debris out of the tube. When the compressed air blows freely through the tube, reconnect the tube to the back of the speedometer and blow through the tube again while your assistant watches the speedometer. If the speedometer still refuses to move, replace the speedometer unit on the dash. This unit is not repairable by the consumer.
Most modern boats make use of a pitot tube to measure speed. The small triangle shaped mechanism sticks out of the boat and takes in water as the vehicle moves through the water surface. The pressure difference causes the speedometer needle to move, indicating changes in speed.
In this manner, how does a boat pitot speedometer work?
Why is my boat speedometer not working?
Speedometer (Pitot Tube Type) The pitot tube speedometer operates by air pressure changes in the hose and speedometer. Water is pushed through the pitot into the hose, compressing the air. Air pressure increases with boat speed, causing the gauge to indicate faster speeds. here
The usual problems are a blocked orifice (little hole in the arm), a blocked vinyl tube and a disconnected, broken, cracked or holed vinyl tube. The easy way to check if to remove the tube from the pitot tube mount and blow into the vinyl hose. If the speedo moves, it's likely the pitot is plugged.