Sooner or later, every owner of water equipment is faced with the need to carry out maintenance of the electric part of the engine. stator-coil (bearing), checking Hall sensors or replacing plumb To access these nodes, you have to dismantle the flywheel that sits tightly on the cone of the shaft.
Trying to remove this part by hand or by means of improvised means often ends in failure, you can damage the thread, break the veneer or, worst of all, deform the flywheel itself. flywheel It is a mandatory tool in the arsenal of water motors.
In this article, we will discuss in detail the types of removables, the nuances of their use and common mistakes that beginners make when servicing engines. Yamaha, Mercury or TohatsuThe right approach to dismantling will save your budget and your nerves.
Why You Need a Specialized Tool
The flywheel on the outboard motor acts as a store of energy and a cooling fan, and it also carries magnets for the generator. It is planted on the shaft of the engine with a high tension on the cone surface and fixed by a veneer. The friction force and centrifugal forces that act when the motor is running create a connection that is extremely difficult to separate.
Use of a hammer or mount for flywheel dismantling Impact loads can cause cracks in the aluminum alloy of the body or damage the crankshaft bearings inside the crankcase. shooter It creates a uniform pulling force along the axis of the shaft.
Using the right tool ensures that the shaft remains straight and the landing surfaces are not damaged, which is especially critical for two-stroke motors, where the beating of the flywheel affects the angle of ignition.
- 🛠️ Allows you to remove the flywheel without impacts and the risk of damaging the crankcase.
- ⚙️ It ensures the safety of the groove and the shaft itself.
- 💰 Save money on expensive repairs at the service center.
Types of Removers for outboard motors
There are many different tools on the market, but they all fall into a few basic categories: the choice depends on the design of your motor and the diameter of the threaded hole in the shaft. There is no one-size-fits-all solution, so it is important to know the specification of your engine.
The most common type is flat-leaf It's a central thrust, threaded rod, and grippers, paws, that cling to the inside of the flywheel, which are often suitable for motors between 2 and 50 hp.
For more powerful units or specific models Honda and Johnson Specialized services may be required interior-carvingThey are screwed directly into the shaft, and the emphasis is placed on the end of the crankshaft through a special sleeve, and using the wrong type of tool can lead to the failure of the thread.
⚠️ Warning: Never use a detachable for car generators without checking the thread compatibility. The threading pitch on outboard motors is often different from automotive standards, which will result in shaft damage.
There are also hydraulic detachers for industrial maintenance, but for private use they are redundant. The mechanical screw force is enough to remove even the most "baked" flywheel.
What to do if the thread in the shaft is broken?
If you find that the crankshaft thread is damaged, do not try to force the process. Using a thread repair tag is only possible if you have skills. Most of the time, you need to drill and install a repair hub or replace a shaft. Trying to unscrew a flywheel with the threads that are broken will lead to the final failure of the knot.
Design and compatibility with brands
When choosing a tool, you need to pay attention to the diameter of the thread of the rod. For low-power engines (2-6 hp), thread is often used. M8 or M10For medium and high power (15-100 hp) the standard is M14 or M16 step-by-step 1.5.
Chinese manufacturers, such as Hidea, Parsun and HDXOften copy the design of the motors. Yamaha and TohatsuSo the detachables designed for the original Japanese engines are often suitable for their Chinese counterparts, but always check the length of the rod - on some models, the shaft can be shorter or longer.
The fabrication material also plays a role. Quality detachers are made of hardened tool steel. Cheap soft metal counterparts can just burst under load or lick the thread on the rod at the most critical moment.
| Motor brand | Typical thread diameter | Design features |
|---|---|---|
| Yamaha (2-50bhp) | M14 x 1.5 | Standard cone, often requires a skipper with legs |
| Tohatsu / Nissan | M14 x 1.5 | Similar to Yamaha, many universal models are compatible |
| Mercury (up to 30 hp) | M12 / M14 | Depending on the year of release, often an adapter is required |
| Suzuki | M14 x 1.25 | Often different pitch thread, you need a careful check |
Even if the diameter is the same, the difference in pitch (for example, 1.25 vs. 1.5) will not allow you to screw the removable to the end, and it will fly out under load.
Before you buy a tenant, unscrew the spark plug and the flywheel nut. Measure the diameter of the shaft thread with a rod or attach a nut to the filmmaker's thread to visually check the coincidence of the turns.
Preparation for the dismantling of the flywheel
The process of removing the flywheel requires careful preparation of the workplace, the engine must be securely fixed to the stand or transom of the boat, any (wobbles) can lead to injury or failure of the tool.
The first step is always to shut down. high-voltage And the hood is removed, and then you have to remove the starter (if you have one) and remove the flywheel attachment nut, and some motors have a special opening to hold the shaft from turning, where you insert a stopper or use a belt locking method.
When the nut is removed, don't rush to pull the removable. Often the flywheel is held not only by tension, but also by oxides or rust. It is recommended to profusely treat the connection with penetrating lubricant (for example, WD-40A light tapping of a wooden kiyan on the end of the shaft (through the embroidery) also helps to break down the corrosion layer.
☑️ Preparation for flywheel removal
Make sure the flywheel is clean, and when you remove it, you may get rust or dirt, which will then get into the crankcase or the glands, and you'll want to wipe the area around the shaft beforehand.
Step-by-step instructions for removal
When the preparations are completed, the installation can be started. renterPut the central stem in the threaded shaft hole, do this carefully so that the first turns do not break. The rod must enter tightly and deeply.
Next, you need to install the gripper legs, they wind up under the inside of the flywheel, make sure that the legs are based on strong pieces of metal, not on thin ribs or plastic elements (if they are inside).
Now the process of squeezing begins. Turn the nut on the rod of the removable (or the rod itself, depending on the design) clockwise. The effort will grow. Do it smoothly, without jerking. If you feel the force has become too much and the flywheel is worth it, add more penetrating lubricant and warm the flywheel slightly with a building hairdryer (not open fire!).
⚠️ Warning: Do not use an open fire (gas burner) near fuel hoses, carburetor gaskets and glands. High temperatures can melt the glands or cause gasoline vapor to ignite.
When the flywheel is derailed, there's a loud click. That's normal. Once the cone is out of the grip, the flywheel will be easily removed by the hand. Be careful, it's heavy and can fall on its feet.
The secret to success is to distribute the effort evenly, and if you twist the filmmaker, it will jam, and it will be harder to remove it than the flywheel itself.
Typical errors and their consequences
One of the most common mistakes is to use a rod that's too short, and in this case, the feet of the detacher hit the end of the shaft before the flywheel comes off the cone, and you're wasting the key and the flywheel is standing still.
Another mistake is ignoring the veneer. Before installing the tenant, make sure that the veneer does not interfere with movement. Sometimes the veneer can get stuck in the groove of the flywheel, and when removed, it turns out, and in the worst case, the veneer breaks, and its residue has to be drilled from the groove of the shaft.
Also, beginners often forget to fix the shooter itself from the twist, and when the nuts rotate, the legs can turn with the flywheel if they're not tightly clamped, which negates all the effort.
- 🚫 Attempt to remove the flywheel without a twisted shaft nut (will lead to a breakage of the thread).
- 🚫 Use shock methods instead of pulling forces.
- 🚫 Use of force without lubrication, which leads to bullies on the cone.
Damage to the cone surface of the shaft or flywheel will cause a beat, which in turn will cause rapid wear of the glands, disruption of ignition and possible destruction of the engine at high revs.
Tool care and storage
After use, the skipper must be cleaned of oil, water and dirt. Outboard Motors operate in an aggressive salty environment, so the tool is prone to corrosion. Rub the metal parts with rags and slightly grease with engine oil.
Store shooter It's better in a dry place, in a factory box or organizer, and don't throw it in a toolbox with a scatter, where it can damage other tools or rust from contact with wet rags.
Regularly check the state of the thread on the rod and nuts. If the thread is gone, replace the part. Using a worn tool is dangerous and inefficient. A quality skipper, when properly maintained, lasts for decades and pays off after the first self-repair.
Which is better: general or specialized?
For a single-motor private craftsman, it is better to buy a specialised detacher for a specific model (or a group of models, for example, for the Yamaha 2-50 hp) that is guaranteed to be suitable and convenient to work with. Universal sets are good for services where there are many different engines, but they are often bulky and require the selection of adapters.
Can I take off the flywheel without a filmmaker?
Theoretically, there are "people's" methods using two strong bolts and a plate, but they are extremely risky. Without a special remover, there is a high probability of damaging the flywheel or shaft. Saving on the tool can result in the purchase of a new flywheel, which costs much more than a tenant.
What if the flywheel does not remove even with the filmmaker?
If the force on the key is huge and the flywheel is standing, it may be "smooth" due to corrosion. Try to warm up the inside of the flywheel with a hairdryer (carefully!), add penetrating lubricant and tap on the end of the shaft through a soft bump, creating vibration. Sometimes it helps sharp but short force (pulp), but do it carefully.