Operation of the outboard motor in real conditions inevitably leads to the accumulation of deposits in the fuel system. carburetor The engine is the heart of the power unit, and the slightest disruption of the throughput of its channels affects the power and stability of the engine. Owners of boating equipment often face a situation when the engine stops idling or stalls under load.
Timely preventive cleaning Unlike automotive systems, outboard motors operate in an aggressive environment where humidity and vibration accelerate the oxidation of parts, and ignoring the primary symptoms of blockage can lead to serious breakdowns that require expensive repairs or replacement of components.
In this article, we will take a look at the entire maintenance process, from diagnosis to final adjustment. specialtyAnd what tools are really needed, and how to avoid the typical assembly errors, and a sound approach to fuel system maintenance is a guarantee of water confidence.
Diagnosis: when needed to clean the carburetor
The need for interference with the fuel system can be determined by the characteristic changes in the behavior of the engine. idleThe engine may spontaneously stop immediately after the gas discharge or require constant snuffing to maintain operation.
Another sign is a loss of traction at high speeds: If the boat stopped "going to planing" or the engine "choked" when the throttle is opened sharply, most likely, the main fuel jelly is clogged, and you should also pay attention to the color of the exhaust gases and spark plugs.
- 🚩 The engine dies when switching from high revs to idle.
- 🚩 A marked decrease in the maximum speed of the boat at full thrust.
- 🚩 The spark plug has a black, soot-colored plaque or wet from gasoline.
- 🚩 Increased fuel consumption without visible leaks.
⚠️ If after a long parking (winter) the engine does not start, in 90% of cases the reason lies in oxidized fuel, which turned into resin and clogged the channels of the carburetor.
It is important to distinguish between carburettor problems and ignition system malfunctions. high-voltage If the spark is strong and blue and the candle is dry, but the engine doesn't catch it, the problem is the fuel supply.
Preparation for work: security tools and measures
Quality carburettor It's not possible without the right tools and the right workplace, because it's a highly flammable liquid, it's a safety issue that needs to be addressed, and it needs to be done in a well-ventilated environment or outdoors, away from open fire sources.
You'll need a standard set of plumbing tools to work with, and you'll need to pay special attention to the condition of the screwdrivers: the slits must be sharp and not slicked, so as not to damage the screw heads of the mix adjustment, and you also need a carburettor cleaner in an aerosol cylinder.
- 🔧 A set of screwdrivers (cross and flat different sizes).
- 🔧 Passages with thin sponges and bogocreas.
- 🔧 A compressor or compressed air canister for purging.
- 🔧 A tank for draining old fuel and rags that do not leave pile.
Before starting work, be sure to close the fuel crane and disconnect the fuel hose. Remains of gasoline from the float chamber are better drained through the drainage hole, if it is provided by the design, or carefully turning the plug. Do not allow fuel to enter the rubber seals and plastic elements of the boat.
Use a transparent fuel drain hose to visually assess the quality of the fuel, and the presence of water or rust will indicate problems with the tank that also need to be solved.
Dismantling and primary disassembly of the node
The process of removing the carburetor may differ depending on the model of the motor, whether it is a carburetor. Yamaha, Tohatsu or MercuryBut the general principle remains the same: you need to access the intake manifold, and two-stroke motors often require you to remove the air filter and the protective cover.
After the gas cables and the suction cables are disconnected, carefully unscrew the carburetor's nuts to the engine. It is important not to lose the spring washers and sealing pads. When removing the assemblies, make sure that dirt or foreign objects do not enter the engine through the open intake window.
Further work is done on the table. carburettorFirst of all, you take the bottom cover of the float chamber, and it's important to not lose the float and its axis, and then you turn the main jeeps, and you remember or photograph their location, because the idle jeeps and the main ones have different bandwidth.
☑️ Procedure for disassembling the carburetor
⚠️ Warning: When twisting the jellyplates, use a strictly suitable screwdriver. Damage to the jellyplate or jellyplate will make it impossible to adjust or replace it further.
Canal washing and sediment removal
The most important step is the direct cleaning of the internal cavities. Mechanical removal of dirt (needle or wire) is strongly discouraged, since you can change the geometry of calibrated holes. The only correct method is chemical washing and purge.
Use specialized carburettorPour through all available channels, jellyplates and cavities, pay special attention to the idle channel, which is clogged first, after treatment with chemistry, blow all the holes with compressed air.
If you don't have a compressor on hand, you can use a can of cleaner that has a thin tube-nozzle, the pressure of the jet at the outlet of the balloon is high enough to knock out the softened deposits, repeat the soak-purge procedure until all the holes come clean air.
What to do if the jellyfish do not unscrew?
If the jelly is stiff, don't use excessive force. Put penetrating lubricant (WD-40 or similar) on the thread and leave it for 15-20 minutes. You can also carefully warm the carburetor body with a building hair dryer, but not with an open fire, since the alloy may have rubber seals.
Check the status of the float. Shake it near the ear, if you hear splash inside, it's depressurized and it's gained fuel, and it's going to sink, causing overflows and constant engine operation on the enriched mixture, and it needs to be replaced or soldered.
Comparison of cleaning methods: efficiency table
There are several approaches to fuel system maintenance, and the choice depends on the degree of contamination and the time available. Below is a comparison of the basic methods so that you can choose the best one for your situation.
| Method | Efficiency | labour-intensiveness | Risk of damage |
|---|---|---|---|
| Washing without disassembly | Low. | Minimum | Low. |
| Partial disassembly | Medium | Medium | Medium. |
| Complete disassembly and UM cleanup | High. | High. | High (for beginners) |
| Replacement of the carburettor | 100% | Low. | Missing. |
The most reliable way is to completely disassemble each element with manual washing.K-cleaning) produces excellent results but requires equipment and caution with aluminium alloys which may oxidize in an aggressive environment.
Complete disassembly and manual washing of each jellyclera is the only way to ensure that all resinous deposits left after winter storage are removed.
Assembly, adjustment and adjustment of XX
The assembly is done in reverse disassembly, and it's critical to get the fuel level in the float chamber right, and for that, you often have to set the carburetor vertically and measure the distance from the plane of the connector to the top of the float with a ruler, and you can find the parameters for your model in the manual.
When installing gaskets, make sure they are intact and free of clamps. The use of a sealant is usually not required if the gaskets are of high quality, but in emergency cases, a thin layer of a special heat-resistant sealant can be used. After assembly, the carburetor is installed on the engine.
The final stage. carburettorMost outboard motors have two propellers: a mixture quality screw (L) and a mixture/idle screw (H or T). Start with the basic settings by twisting the screws to the point (no fanaticism!) and twisting them to the required number of revolutions according to the instructions.
- 🔩 Warm up the engine for 3-5 minutes.
- 🔩 Set minimum steady speeds with the screw number.
- 🔩 Find the position of the maximum speeds.
- 🔩 Again adjust the number of screws to the desired turns of idling.
A properly adjusted motor must respond clearly to the gas handle, not deaf during a sharp discharge and keep idle speeds stable in neutral gear. If the motor sneezes or shoots at the muffler, the mixture is too poor, if it smokes and smokes - too rich.
What if after cleaning the engine still does not keep blanks?
If cleaning didn't work, check the integrity of the crankshaft coil on the carburetor side. Pumping foreign air through the oment depletes the mixture, and no adjustment of the screws will help. Also check the petal valve for chips or gaps.
Can I wash the carburetor in ultrasound?
Ultrasound is a great way to knock dirt out of microchannels, but if the carburetor has plastic or rubber elements (not only gaskets, but inserts), it is better to remove them, because ultrasound can destroy them, and it is also not recommended to use aggressive acids in a ultrasound bath.
How often should I clean the carburetor of the outboard motor?
The recommended frequency is once a season or every 100 motor hours. If you use the boat infrequently and the engine is with gasoline for more than 2-3 months, cleaning is mandatory before the next start.
Maintenance technology will allow your outboard motor to run like a clock. 90% of problems with starting and working on singles You can do this by cleaning the carburetor properly, and you can't neglect prevention, and the water element will only make you happy with positive emotions.