Just remember to measure twice and cut once. New stepped bottom technology can make it tricky to get the pitot tube mounted correctly. Check to see if the speedometer needle will move again. The display will be connected to the pitot by a thin, stiff tube that transfers the water pressure at the pitot to the sensor in the display. Turn on the boat's electrical system and set the controls on your display unit to show the speedometer reading in the units and format you prefer. Whether it's a 5-knot sailboat or a 100-knot racer, the obsession with speed is pervasive.
The only other part on the gearcase pitot that can fail is the plastic fitting on top of the lower. When you are done cleaning the tube, attach the tube back to the speedometer. The easy way to check if to remove the tube from the pitot tube mount and blow into the vinyl hose. If this is not a option for you then find the cleanest water location air will effect it. Epoxy the bit into a piece of wood dowel. I guess I have to think about it a little more.
Even if they are not accurate, they are precise. Inspect the length of the tube for holes, cuts, kinks or wire ties that visibly pinch the tube. Find your pitot tube mount on the transom. A standard speedo will be even worse. Is this commonplace on ouboards? Where is this hole that everyone is talking about, I am very new to ownership of a boat I have a bowrider 180 Sea Ray. If you haven't checked out the Lido's do so. If one unit goes down you loose everything.
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. To install, use a hole saw to cut the hole. I also gave one of these to my father and he thinks the same thing. Replace it with a brass one if you are in freshwater, another plastic one if you are in salt. In fact I think this is the preferred route. Thos Mercs, like many newer engines have the pitot tube pick up built into the lower unit. I really do not like the idea of drilling into my mahogany and possibly ruining it, but I do sowmewhat agree with what Tom W Clark said in that the analog speedos are consistant and for the most part low mantainence, as well as low cost.
Installation on transoms that deviate from that angle may require use of 1 or 2 wedges Figure 2 above in the sender installation. If it doesn't move the hose is plugged, other wise defective or the gauge has an issue not very common. By the time you buy the arbor and the hole say, you will have spent a large portion of the cost of the tachometer over again! Get yourself an extra drill bit and rough up the shank with a grinder. Inspect the pitot tube for breaks or holes; if any are present, replace the pitot tube. There must be air in the hose. I Tried Compressed Air And No Luck. Step 8 - Fix the Speedometer If the speedometer needle does not move, remove the tube from the speedometer.
Where is the best place to mount a speedometer pickup at on a single engine transom? Keep your tools and safety gear close at hand during the installation of an electronic tachometer. Step 4 - Disconnect the Speedometer Tube If the tube of your speedometer is connected to the pitot tube, remove the tube from the speedometer by unscrewing the connector on the pitot tube. A lot less cutting with a lot more functionality. The hole should be angled downward at about 45 degrees. It's a lot easier to start with the basics first.
This is a universal Teleflex unit and fairly typical of what they look like: The tiny hole is on the end of the arm, often in a little metal plate, inserted into the tube. If you want it to be off with the ignition switch, take the positive feed from the ignition switch 'A' post purple wire to the gauge. Cut out a notch in this grommet to pass the wires through or drill a new hole for the wires to be sent. If it is connected to the outboard motor, just release the quick-connect joint. Also good to clear a trailer bunk or when beaching a boat. With the tachometer and wiring in place, finishing the job is easy. If the speedometer still refuses to move, replace the speedometer unit on the dash.
Fixing your speedometer is a minor repair. A small hole was found in the leading edge of the gearcase and ran up to a plastic barbed fitting on top of the gear case just in front of the motor's pivot point. The light is electrical but simple. If you do find holes on the tube, all you need to do is replace the damaged tube with a new tube. The new style sender will accommodate transom angles from 13 to 20. Can you just connect any speedometer to this tubing, or is it calibrated for a particular gauge mechanism? If you have a cored fibreglass hull, drill the hole a bit oversize and line it with thickened epoxy to seal the core before drilling the hole again at the proper size. We don't design things like that on our aircraft for this very reason.
If water is in the hose, blow it back to the pitot until air bubbles exit. You could rent them, but borrowing them is even better. Reconnect the hose before launching the boat or the hose will siphon water into the boat. Connect the green wire to the negative post of an existing electronic coil or Electronic ignition system using a tachometer adapter as a connector. It should be in an area of relatively clean water flow, and should not be behind a keel, rudder, propeller or other appendage. Much safer for you and the wood.
Cutting the holes is really no big deal. If you have a lighted tach, you can just use a jumper from the speedo like you would on a house switch when carrying the circuit on. As far as wiring - The speedo is just a tube like others said. I like to compare both at a given time. Reconnect the hose to the speedometer. Speedometers cannot be calibrated in the field. I don't think it's a big deal but then again I have a whole shop full of tools and a set of hole saws.