English 
boat speedometer not working
Common problems are clogged orifices (small holes in the arms), clogged vinyl tubing, and broken, broken, cracked or perforated vinyl tubing. A simple way to check if the tube is removed from the pitot tube holder and blow in the vinyl hose. If the speedo moves, it is likely that the pitot tube is clogged.
Besides, how does the speedometer work on the ship? Speedometer (pitot tube type) Pitot tube speedometer is operated by the change of air pressure in the hose and speedometer. The water is pushed into the hose through the pitot tube and compressed air. The air pressure increases as the ship's speed increases, causing the gauges to indicate a faster speed.It should be a rubber tube from the front of the engine to the lower unit. The water hits the end of the pipe in the water inlet hole of the lower device and creates "air" pressure in the pipe that supplies water to the speedometer. If the pipeline between the inlet and the speedometer is broken, water may enter and fill the pipeline during operation, or if the pipeline is blocked, pressure will not be delivered to the speedometer. Open the pipeline, check if there is water, and then blow the air toward the speedometer with your mouth. The speedometer should move. This line is usually broken when the lower unit is changing with the falling impeller, so it can get chaotic splicing and is easy to spot.
So,how to do when the boat speedometer not working:
Step 1-Check the cause of the damage.
Step 2-Locate the speedometer tube.
Step 3-Check if there are holes/cuts in the pipe.
Step 4-Disconnect the speedometer tube.
Step 5-Replace the tube.
Step 6-Replace the pitot tube.
Step 7-Check the speedometer.
Step 8-Install the speedometer.
The speedometer on the boat works with a pitot meter. The working principle of a pitot meter is to compare the speed of your boat with the speed of the water you are traveling on. Its working principle is to measure the speed of water entering the pipe and compare the air pressure to give an estimated speed number.So,use a compressor to remove any dirt or debris that may stick to the pipe. Check whether the speedometer needle will move again. To do this, just blow on the other end of the pipe
Get a Quote / Info