The shift to steering a boat by turning a key is not just a fashion or a show of modernity, it's a fundamental change in comfort that's particularly noticeable when you're using powerful engines. boat-engine With a volume of more than 15 horsepower by hand, you know how much time and effort it takes, especially after several unsuccessful attempts.
System system Electric Start It takes all the physical work of scrolling the crankshaft at the required frequency to ignite the fuel mixture, which reduces the load on the operator and minimizes the risk of injury to the hands or back, but the implementation of such a system requires a competent approach to the selection of equipment, understanding the circuitry and proper preparation of the battery base.
In this article, we will discuss in detail how an electric starter is designed, how it differs from manual start-up, and whether the game is worth a candle. You will learn about the intricacies of installation, the nuances of connecting wiring and the rules of operation that will prolong the life of your equipment. starter This ensures that your engine will start in any weather.
Advantages and Disadvantages of Electrical Startup
The main argument for this is, of course, convenience, and by turning the key or pressing a button, you're setting the whole machine in motion, and it's critical for people with disabilities or for those who prefer to go fishing quietly without any extra movement. electric starter Often involves a built-in generator that recharges the battery while driving.
But there's a downside to this, and it's getting more complex, heavier and more expensive, and you're going to have to monitor the condition. batteryYou can't start the engine if you don't have a backup manual start. Many modern models have a combined system, but the weight and dimensions of the engine still increase.
⚠️ Warning: Installing an electric start system on a motor not originally designed by the manufacturer may cause a crankshaft or flywheel to break. Make sure the flywheel has a seat under the starter's bendix.
Reliability is also important to consider. Electrical components are sensitive to water, salt and vibration. Poor sealing of contacts can lead to short circuits at the most inopportune moment. So when choosing between manual and electric start it is important to weigh the pros and cons specifically for your use case.
The Starter's Device and Principle of Operation
At the heart of the system is an electric DC motor that, through a clutch mechanism (bendix), transmits torque to the flywheel of the internal combustion engine. When you turn the key in the ignition lock, the electric current from the battery goes to the retractable relay, it pushes the bendix gear forward, hooking it to the flywheel, and at the same time closes the power contacts of the electric motor itself.
Once the engine starts and the speed increases, the centrifugal force or spring returns the bendix to its original position, breaking the engagement, and this prevents the rotation from being reversed from the running ICE to the starter, which could cause it to collapse. retractable, the brush knot and the bendix itself.
Modern. starters They're often equipped with a planetary gearbox that allows you to use a smaller motor and a smaller weight to achieve the same torque, especially for compact outboard motors, where every kilogram counts, and the reliability of the entire system depends on the quality of the contacts and the state of the wiring.
Why can a starter click but not spin?
Most often, this indicates a discharged battery or oxidation of the terminals. Less often, the cause lies in the burning of the pentacles inside the retracting relay or the wear of the brushes of the electric motor. Either way, first check the voltage on the battery under load.
Choosing a battery for a boat
The heart of the electric starter system is the battery. For outboard motors, conventional car starter batteries designed for short-term high-current returns are categorically not suitable. In water-based conditions, where tilts and vibrations are possible, special special needs are required. traction or starter-traction batteries with gel (GELor absorbed (AGM) electrolyte.
These batteries are completely sealed, have no fear of deep discharge, and can operate in any position. Battery capacity must be matched with a margin. For a 20 to 30 hp engine, the minimum comfortable capacity will be 55-60 Ah, and for more powerful units, from 75 Ah and above. A weak battery will not only not start the engine, but can quickly fail.
When choosing a cold start current (CCA), the higher the rate, the easier the engine will turn in cold weather, the vibration resistance of the body is also important, and the usual "acid" with a liquid electrolyte can lose some of the active mass from the plates due to constant shaking on the wave, which will lead to the closure of the cans.
| Type of AKB | Duration of service (cycles) | Security | Price. |
|---|---|---|---|
| WET (Liquid electrolyte) | 200-300 | Low (requires ventilation) | Low. |
| AGM | 400-600 | Tall (hermetic) | Medium |
| GEL | 600-800 | Maximum | High. |
| LiFePO4 (Lithium) | 2000+ | High (with BMS) | Very high. |
Use special sea terminals with spray protection and lubricate them with a consistent lithium lubricant to prevent oxidation.
Instructions for installation and connection
Installation of the electric start system requires care and consistency. Before starting work, make sure that the engine is cooled and the battery is disconnected. First, you need to dismantle the casings and access the flywheel. If the motor design provides for the installation of the starter, the crankcase will have appropriate threaded holes and a seat.
The starter is installed through a special box that comes with the kit. It is important to correctly set the gap between the gears of the bendix and the flywheel crown. Too small a gap will lead to snacking, too large to the inability to engage. After mechanical installation, the power cable is laid from the battery to the relay and then to the starter.
The wire cross section must be consistent with the current of consumption. For most motors up to 60 hp, a 10-16 mm2 copper wire is sufficient. All connections must be reliably insulated by thermal shrinkage and protected from water. The wiring is fixed by clamps away from the hot parts of the engine and movable elements.
☑️ Check before the first launch
Typical malfunctions and diagnostic methods
Even the most reliable equipment sometimes fails. The most common problem is that the starter does not respond to the turn of the key. 90% of the time, the cause lies in a discharged battery or oxidized contacts. First of all, check the voltage at the battery terminals. If it is below 11.5 V, the engine is unlikely to start. It is also worth checking the integrity of the fuse in the power chain.
If the starter clicks but doesn't, maybe the contacts inside the retractor have burned or the brushes of the electric motor have worn out. Sometimes the bendix gear just can't catch on to the flywheel because of a broken tooth, which requires the starter's dismantling and visual inspection.
It is important to regularly prevent, once a season, it is recommended to remove the starter, clean it of dirt and lubricate the shaft. Getting water inside the housing through the glands can cause coils to corrosion, which will lead to expensive repairs or replacement of the unit.
⚠️ Warning: Never hold the key in the Start position for more than 10-15 seconds, which can cause the starter windings to overheat and cause the battery to run out, and allow the system to cool down for a minute before trying again.
Regular cleaning of contacts and control of the density of the attachment of terminals prolong the life of the launch system by 2-3 times.
Maintenance and care of the system
The durability of the electric start depends not only on the quality of the components, but also on the care. After each trip, especially over salt water, it is recommended to wipe the outer parts of the motor and the available wiring elements with a wet cloth, removing salt plaque. Salt spray is the main enemy of the electrician on the boat.
Once a year, preferably before you start navigation, do a complete inspection. Remove the protective casings, check the insulation status of the wires. If you notice a darkening of copper or green plaque on the contacts, clean them with fine sandpaper and treat them with a special spray-protection for electrical contacts. Also check the tension of the generator belt, if any, since a weak belt will not charge the battery.
You can't keep a boat with a battery in the winter, you have to take it off, charge it fully, store it in a warm room, recharge it periodically, and leave it in the cold, and the battery can freeze and collapse, and you can't start it in the spring.
Can I install an electric starter on the engine without factory training?
It's theoretically possible, but it's extremely difficult and expensive, and it would require replacing the flywheel with a modified one, installing a generator, redesigning the crankcase, and creating mounts, and often the cost of these jobs and parts exceeds the cost of a new electric-start motor, and it's easier to sell an old motor and buy a new one.
Why does the engine stop after starting through the electric starter?
This may be due to a faulty charging system, and if the generator doesn't produce current, the motor only runs on the battery charge, which quickly goes down, and it may be due to the carburetor or the ignition system, which is not directly connected to the starter, but manifested at the time of launch.
What resource does a boat starter have?
If properly operated and maintained, a quality starter life is 5-10 years or 1,000-2000 launch cycles, but in an aggressive marine environment, this life can be halved due to corrosion.
Should I lubricate the starter's bendix?
Yes, but you only need to use heat-resistant graphite lubricant, and ordinary lithium lubricants can thicken in the cold or leak out when heated, which will lead to a jamming mechanism, and the lubricant is applied in a thin layer on the shaft slits and gear.
What to do if the battery is far from the coast?
If your motor has a combined system, try to start it manually with a screw. If it's electric-only, you'll have to paddle or tow it, so having a manual backup start on powerful motors is a safety requirement.