Or pull the tube at the gauge and the motor and try blowing through the tube. The lower unit has an opening on the forward side of the prop. If it becomes disconnected from the fitting on the leading edge of the gearcase, your speedometer will not work. Either that or grab a air hose and use pressure to clear the line. Found really nice water to the east but no structure. Available with black or white faceplate design. After all that, I screwed the barb fitting back on, connected a hose and blew in air.
I just bought a boat with a 88 mariner 115hp and my speedo doesnt work either. Careful with the wire attempting to poke it out often will push and compress the vegetation into a hard solid plug. Pitot tubes are known to get clogged often. I have a tournament this weekend and I wanted to fix it before then. Will that damage the dash gauge? If I get the hose off what is the best way to clear the clog in the lower unit? The speedometer works on changes in the air pressure in the hose. Also while I'm at it the Tachometer is inconsistant. I recently got stuck in the mud and now my speedo isn't working and I'm sure that tube is clogged.
After a time with no luck I gripped the bit with a pair of vise grips to help grap the debris inside the hole mostly wood and continued to slowly turn and pull out the debris especially since I had no idea how deep I would need to go and also didn't wan't to puncture the gear housing. Go to the very front of the gear case. Same system used on aircraft to measure fwd speed, except no water. If you can't find a small diameter bit I have used large sewing needles. I usually use a little twist drill spun between my fingers to get the mud out of places like that. Water pressure will push in the tube and cause the speedometer to register. This year I have been using the boat at least one to two times a week and just loving time on the river.
I'm not sure how to go about unclogging it or how deep it is. I think you're probably right, but I can't find the block. It is advisable to bring the old tube when you buy the new one so you can get the same specifications. I have a 2008 F60 and the speedometer tube has become plugged. I blew out the hole from the top tube connection with water and air at the end. With the compressor, take out any dirt or debris that may be stuck onto the tube. The Yamaha line is pretty stout, a simple connector would take care of it.
If a wire tie is pinching the tube, remove and replace the wire tie, making sure not to pinch the tube. Inspect the pitot tube for breaks or holes; if any are present, replace the pitot tube. If your not to sure about using a very small drill bit or it doesn't work for you, try this: trim motor all the way up, look in the area where the lower unit bolts onto the motor, you will see a plastic tube with a fitting that probably has 2 wire ties on it. I cannot blow air in the other direction into the gear case. Anyone have experience with this? It feels like it makes a bend and then it's just open space in there. I know this has been discussed before, but I can seem to find the thread. From the factory, there's a hose connector just beyond the engine.
I would like to figure out why my speedometer does not work. When you inspect the speedometer tube in the lower unit, you have the opportunity to lubricate the lower unit as well. The tubing length shouldn't matter. When the boat is in motion, water flows into this tube, compressing the air in the tube. I was fishing on my cousins boat last Saturday and noticed a steady stream of water from under console. Only difference the adaptor I need is having both ends ribbed.
I can't see any clogged holes on the exterior of the gear case. You may to blow through hose with about 30 psi air to clear pickup, if use too much air pressure it can pop hose off nipple in lower unit then you would have remove lower unit to put hose back on. The line from the speedometer has a splice at the motor which is a perfect spot to pull and send water in the opposite direction. If so, you should be good with cutting that end of the hose off, to the length required, and pushing the new cut end back onto the new pitot. I am a somewhat new owner of a Ranger boat with a two-stroke 90 Mercury outboard. Is there any way to visually inspect or diagnose the pickup tube location from on the boat.
If it is, replace it with a new one. Can I shoot water down the hose to flush it? Subscribe to this post - from the quick reads and searches here it is looking very positive we'll find an answer to this. He's old school and has the age and experience. Don't forget to reconnect and secure the hose. 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.