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Diy inboard boat motor12/17/2023 ![]() ![]() ![]() Close inspection of the points should be made by gently opening point gap with a screwdriver. Make sure key switch is in the "off" position when performing the following steps, or you may end up with a new hairdoo. Needs for replacement of conventional type distributor parts include burnt points, engine will not start or rev to full RPM(points worn or set at wrong gap), or any signs of corrosion, including distributor cap. The point gap on most engines is about 19, or. The condensers main function is to balance current flow and actual reverse the process through the points. At the precise instant that the points are opened, a break in the current occurs, and causes the ignition coil to output the stored energy. As the cam lobe rotates, the points open and close accordingly. The points are attached to the point plate, with one end tip riding on the cam lobe. As the distributor shaft rotates, the rotor also turns and the tip makes slight contact with the lugs in the cap. Do not attempt a simple cleaning of the parts, due to once corrosion starts on a part, it will reoccur no matter how much cleaning is performed. Also, if any corrosion what so ever is seen inside of distributor, replace the parts as required. If it has a dead short to ground, ignition will not fire. This wire must be in good shape with no frays or actual contact to any ground source. Upon removing the distributor cap, you will see the rotor, points, condenser, and a black wire coming from the "-" side of the ignition coil to the points. Refer to a manual, or email us for the specified timing setting for your particular engine application.įirst lets give the conventional point type distributor a look, figure 3. Timing is essential when supplying fire to each spark plug at the correct moment. The distributor needs to be checked periodically for being set at the correct timing. Both are serviceable, but look and operate quite differently when viewing the internals. Later models have changed to "HEI" or electronic ignition figure 4. Early models use a conventional contact point system figure 3. Its main job is to tell each spark plug when to fire, and it also self adjusts spark advance to keep the motor at peak performance. The distributor is a very uniquely designed part that serves many functions. The ignition coils job, is to acquire and store electrical current, amplify stored current upward to around 15,000 volts and then release the energy to fire each spark plug.įrom the coil, we go to the distributor. ![]() Unfortunately, there is no sure fire way to test the coil without replacing it, so if the rest of the ignition is in good shape, that might be the last thing to try in the case of "no fire". If not, trace purple wire until you find the break. If so, then switch and wire are in good shape. With a voltmeter, and key switch in the "on" position, check to see that + side of coil(or purple wire) has a full 11 to 12 volts to it. If your motor seems to not be getting any fire, this would be the place to check first. First thing that gets the "juice", is the resistor mounted near the ignition coil if equipped with external resistor, or the ignition coil if equipped with internal resistor figure 2. ![]() This energizes the ignition system and makes things start to happen. Next, we look at what happens when you turn the key switch to the on position. If nothing unusual can be found with ignition switch, then it most likely is in good working order. Make sure wires on terminals are tight and free of corrosion. If you cannot distinctly feel the "click" as you rotate the key to each position, replace the switch. Simply make sure that the key solidly clicks to each position without sloppyness involved. Everyone would know what this device basically does, but can sometimes be overlooked when troubleshooting an ignition problem. To start things off, lets look briefly at the ignition switch, figure 1. Since design is very simple, there is not all that much that can go wrong, and not be easily fixed. They consist of the ignition switch, a coil to store and release enough energy to fire the spark plugs, distributor to distribute the spark to the correct cylinder at the correct time, and the spark plugs which fire to cause combustion in each cylinder. Most early model marine engines are all typically the same when it comes to ignition systems. We will take a look at both early and late model ignition systems, and take some of the mystery out of troubleshooting, along with how to correct ignition problems. Regardless of which you have, don't let ignition problems fluster you. The ignition system of a marine engine is fairly simple for earlier models, and fairly sophisticated on later models. In this section, we will be referring to 8 cylinder engines, but the same basics apply to any marine inboard engine unless otherwise specified. Johnson Evinrude Mercury Mariner Force Chrysler Yamaha Mercruiser OMC Cobra DIY inboard outboard boat motor parts & accessories ![]()
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