Buying a new one boat-engine It's always a celebration for any water motor that knows how to use quality equipment, but once unpacked and put on a transom, the owner has to perform the most important procedure, which directly depends on the life of the engine, it's about getting into service, or, as they say, running.
Many newcomers mistakenly believe that modern manufacturing technology allows them to operate at full capacity, ignoring the manufacturer’s recommendations, a fatal mistake, especially for two-stroke units, where the grease of rubbing vapors is carried out by oil added to the fuel. Incorrect lapping of the piston group in the first hours of operation can lead to bullies, loss of compression and expensive repairs.
In this article, we will discuss in detail how to prepare the equipment for the first launch, what proportions of the fuel mixture to comply with and how to change the modes of operation depending on the accumulated motorcycle clock, you will learn why you can not keep constant rotations and how to understand that the process was successful.
Preparation for the first launch and system inspection
Before pulling the start cord or turning the ignition key, you need to conduct a thorough visual inspection of the unit. Transportation and loading and unloading may have weakened the fasteners, so first of all check the tightening of the diewood mount bolts to the transpane and the condition of the fuel hoses. lower unit It is installed strictly vertically, and the mounting system is securely fixed.
Particular attention should be paid to the lubrication system. Unlike the four-stroke brothers, the two-stroke engine does not have an oil crankcase in the usual sense. Lubrication occurs by burning oil mixed with gasoline. Therefore, the quality and freshness of the components of the mixture play a crucial role. Use only fresh gasoline with an octane number recommended by the manufacturer (usually AI-92 or AI-95), and a special oil labeled with the labeling of the oil. TC-W3.
☑️ Initial pre-break-in inspection
⚠️ Warning: Never use car oils for two-stroke engines! They form a slab that coking the exhaust windows and disabling the piston window. Only specialized oils for water machinery!
Checking the cooling system is a critical step. Even on land, when using a water barrel, you need to make sure that after starting from the control hole, there is a stream of water. The absence of a water jet even for 10-15 seconds of idle work can lead to overheating and deformation of the cylinder head.
Preparing the right fuel mixture
The quality of the break-in depends on 80% on how well the fuel mixture is prepared. During the laundry of the parts, the amount of oil in gasoline must be increased compared to normal operation, which creates a denser oil film on the cylinder walls and crankshaft bearings, protecting them from dry friction at high temperatures.
Standard proportions for breaking in are often different from workers. If the manufacturer in the instructions indicates a ratio of 1:50 for normal work, then for the first tanks it is recommended to use a mixture of 1:40 or even 1:33 (depending on the recommendations of a particular brand, for example, Yamaha, Tohatsu or MercuryAlways look for the exact numbers in the manual of your particular motor.
Use a measuring tank with a scale applied to mix fuel. You can't tell the right proportion by eye, and a smaller error will lead to overheating, a larger one to the formation of soak on candles.
The mixing process should take place in a separate clean canister, not directly in the engine tank. First pour the required amount of oil, then add half the gasoline, shake it hard, and only then add the rest of the fuel, which will ensure the most uniform emulsion.
The finished mixture has a limited shelf life; do not leave diluted gasoline for storage for more than a month, as it loses its properties and can deflagrate. For breaking in, prepare fresh mixture immediately before getting on the water.
Working hours during the first hours of operation
The process of running in is the alternation of different modes of operation of the engine. The main mistake of beginners is to work at constant speeds. The engine must operate in an alternating rhythm so that the piston rings work evenly over the entire surface of the cylinder.
The first 10 minutes (about one full tank at idle and low speeds) the engine should operate in a gentle mode. The turnaround should not exceed 2000-2500 per minute. During this time, the primary distribution of oil to all components and the heating of the metal to operating temperatures occurs, sharp opening of the throttle valve during this period is prohibited.
Then there's the main stage, which is about 8-10 hours, and you can get a short-term speed up to 75-80% of your maximum power, and it's important to alternate those accelerations with low-gas, like 2 minutes at higher speeds, then 3 minutes at a quiet speed, and this kind of engine breathing helps you to get the rings to grind better.
⚠️ Attention: It is strictly forbidden to work on maximum gas for a long time during the break-in (100% throttle), this can cause local overheating and bullying, since the gaps between the parts have not yet reached optimal values.
After every 2-3 hours of operation, it is recommended to take a break, let the engine cool down and visually inspect the knots for leakage of fuel or oil. Also check the reliability of the engine mounting, since vibrations in the first hours can weaken the tightening of the screws.
Table of breaking in modes by motor clock
So to make it easier to understand, and to keep you from getting confused by numbers, we've systematized the basic steps of lapping the table, and following this graph will greatly extend your life. two-stroke.
| Stage (Motoclock) | Throttle mode | Maximum turnover (%) | Action |
|---|---|---|---|
| 0 - 0.5 (10 min) | Idle move | 20-25% | Checking the cooling system, warming up |
| 0.5 - 2.0 | Variable gas | 50% | Short-term acceleration, work on small |
| 2.0 - 8.0 | Active break-in | 75-80% | Alternating regimes, avoiding constant turnovers |
| 8.0 - 10.0 | Final | 90% | Short-term exits to full capacity |
| More than 10.0 | Operational | 100% | Transition to the standard proportion of the mixture (1:50) |
After 10 hours of maintenance is completed, which includes replacing the oil in the gearbox (even if it is visually clean, there may be metal shavings from the grinding of gears) and replacing the spark plugs. Old candles are better preserved as an indicator of the condition of the engine, and in their place install a new kit.
Why change the oil in the gearbox after running?
The new gearbox also has a laundry process, and it produces a fine metal shaving that, when it's left in the oil, acts like an abrasive, accelerating the wear of the gears, and the draining of the rolling oil removes the suspension.
Typical errors in the running of outboard motors
Despite the availability of information, water-engineers continue to make odious mistakes that negate all efforts to care for machinery. One of the most common is running "dry" or on a poor mixture in the hope of saving oil. Remember, the cost of a piston group and the work of a master to replace it is many times higher than the price of a liter of quality oil.
At the other extreme, running the motor in a barrel of full-gas water, which only partially simulates the load, and the propeller encounters resistance in water, and the load on the crankshaft is distributed differently from when you're rotating in the air or when you're running through the free flow of water, and you can only fully run it under load, which is when you're driving on water with your propeller installed.
The temperature is also often ignored. Overheating is enemy number one. If you feel the engine is not working properly or the control hole has stopped running water, immediately shut down the engine, and continuing to work in such conditions is guaranteed to lead to a jamming.
The rule of running is that it's better to underload the engine than to overheat it. Smoothness and gradualism are the key to a long life of technology.
Completion of the break-in and transition to standard mode
When the motor clock clock clock is over 10 o'clock, you can consider the process of running in complete. Metal parts are worn, the gaps have taken working form, and the engine is ready for full operation. Now you can switch to the standard ratio of the mixture specified by the manufacturer (usually 1:50 for modern oils).
After the first full fishing or walk in the new mode, it is recommended to check again the tightening of all bolt joints, especially the fasteners of the lower unit and lower unit leg. Vibrations after the final laundry may require correction of the puff moment.
Keep in mind that even after running the engine requires careful attitude: Regular replacement of candles, use of high-quality filter separators for fuel and flushing the cooling system with fresh water after each exit into salt water - is a guarantee that the engine will last you many seasons without serious breakdowns.
Can I use fuel additives when running?
Modern TC-W3 oils already contain the necessary additive package. Adding additional "improvers" can upset the chemical balance of the mixture, lead to a change in the combustion temperature and, as a result, to improper break-in. Use only pure gasoline and quality oil.
How many liters of mixture is needed for a full break-in cycle?
The volume depends on the consumption of a particular engine, but on average, it takes from 15 to 25 liters of fuel mixture for 10 hours of running, and the exact flow rate can be found in the specifications of your model, dividing the maximum flow rate by 2 (since the break-in is not at full gas).
Do I need to change the screw after running?
No, you don't need to change the propeller after running in if the regular propeller is properly matched to your boat and tasks, but if you're planning to carry heavy loads or reach maximum speeds, it makes sense to pick up a screw with a different pitch after the engine has fully revealed its life.
What to do if the motor stalls during the break-in?
Don't panic. Let the engine cool for 10 to 15 minutes. Check for sparks and fuel. Most often it's a candle (soaked in oil) or a fuel water. Blow the system, wipe or replace the candle, and try to run again at idle speeds.
Can I run the engine in winter?
Technically, you can use a barrel of water in a warm room, but you can't run a full load (on water) in the winter, and you can't run a single barrel in the winter without the necessary warming effect and the piston load.