Assembly process boat-engine It requires the owner not only to have free time, but also to have a deep understanding of how the two-stroke powerplant works. Often, the need for assembly arises after major repairs, replacement of the piston group or when installing the engine on a new lower unit after winter storage. Competent layout of all components directly affects the life of the engine and its traction specifications on water.
Unlike four-stroke analogues, here the tightness of the crankcase and the correct sequence of tightening of the fasteners are critically important. orion It is famous for its simplicity, but ignoring technical regulations can lead to the rapid failure of even a new set of spare parts, and in this article we will discuss every step, from the preparation of the workplace to the final adjustment of the carburetor.
It is important to understand that assembly is not just a mechanical connection of parts, but the creation of a single system where each element interacts with the other. A critical parameter during assembly is the tightness of the crank chamber, since the air sucking through the coils leads to impoverishment of the mixture and overheating by the piston. Let’s look at what it takes to do a quality job.
Necessary tools and workplace preparation
Before work begins, a clean and well-lit space free of dust and fine debris should be organized. crankcase down plumbingIt can cause abrasive wear of rubbing pairs in the first minutes of work. To assemble, you will need a standard set of locksmith tools, including a dynamometer key, which will ensure the accuracy of tightening of threaded joints.
Particular attention should be paid to the purity of the liquids and lubricants used. Gasoline should be fresh, and oil should meet the specification. TC-W3 Use of used oils or mixtures that have stood for more than a month, as this may disrupt the work of the manufacturer, is not allowed. fuel-system.
- 🛠️ Set of carob and cape keys (from 6 to 19 mm)
- 🔧 Dynamometer key for controlling tightening forces
- 🧴 Plastic lubrication (lithium or specialized for outboard motor)
- 🧼 Degreaser and rags without pile
- 🔨 A hammer with a soft metal or embroidery
Prepare all components in advance, and arrange them in order of assembly, to avoid confusion and loss of small parts such as veneers, locking rings and gaskets. If you are assembling after repair, make sure that all new parts have passed the initial geometry test.
Defection and preparation of components of the power unit
Start engine assembly orion It should be done only after a thorough defect of all the removable parts, even new parts purchased in the store can have manufacturing defects that must be identified before installation. crankcase for cracks, chips and deformations of seats under bearings.
Pay special attention to the condition of the crankshaft. The beating of the rod necks should not exceed the permissible values specified in the technical documentation. If the shaft has traces of overheating (whitening or blue metal) or deep risks, its operation is unacceptable, as this will lead to destruction. bearing and the engine jamming.
⚠️ Warning: Never re-installe old ossels. Disposable seals lose elasticity after removal and will not provide the necessary tightness, which will lead to air sucking and destruction of the piston group.
Check the status of the petal valve. Petals must be snugly adjacent to the body around the perimeter, have no chips or cracks. The gap between the petal and the body is checked by a probe and should not exceed 0.1 mm. idle and a difficult launch.
Assembly of the crank-shaft mechanism
Assembly crank-and-wheeler (CSM) is the most important step: the bearings must be installed on the crankshaft with uniform heating of the internal clip of the bearing to a temperature of 80-100 degrees Celsius, heating avoids impact loads when pressed and ensures a tight fit.
When assembling the halves of the crankcase, you need to use a new gasket or a quality sealant designed for gasoline engines. Apply the sealant in a thin uniform layer, avoiding getting excess into the cavity of the crankcase, where they can come off and score. blow-window.
☑️ Control of the assembly of the CSM
Puffing the crankcase mount bolts cross-cross, gradually increasing the force to a nominal value. A sharp or uneven puff can cause the halves of the crankcase to skew, causing the shaft to jam or break the glands. After assembly, check the ease of rotation of the shaft - it should rotate freely, without jamming and extraneous noise.
| Parameter | Nominal value | Permissible wear and tear | Control tool |
|---|---|---|---|
| Gap in the rings (mm) | 0.25 - 0.45 | 1.0 | Squirt |
| The shaft beating (mm) | 0.00 - 0.05 | up to 0.10 | Time-type indicator |
| Time of crankcase tightening (Nm) | 18 - 22 | - | Dynamometer key |
| Bearing heating temperature (°C) | 80 - 100 | - | Thermometer/Oven |
Installation of piston group and cylinders
The piston group must be carefully installed. Before mounting the rings, make sure that they are correctly oriented in the grooves of the piston (usually the marking "Top" or the dot should look upwards). The ring locks should be spread 120 degrees relative to each other to prevent gases from breaking through in one direction.
When you put the cylinder on the piston, use a special mandrel or gently squeeze the rings with your fingers so that you do not damage them or break the jumpers. Sharp movements are unacceptable. The cylinder should sit on the crankcase freely, without distortion, relying on the installation pins.
The nuances of laundry rings
For rapid laundry of new rings, it is recommended that the first 3-5 hours of operation be operated in a gentle mode, avoiding long work at full speeds. This allows the rings to take their place in the grooves and provide better compression.
After you install the cylinders, check the compression. orion A low compression can indicate a piston defect, improper assembly or valve system problems, and a high compression indicates a correct assembly and readiness of the engine for adjustment.
Installation of the ignition system and carburetor
Installation ignition It starts with the flywheel, and the key here is to set the right angle of ignition ahead. orion With electronic ignition (EI), this process is simplified, but checking the gap between the coil and the flywheel magnetoconductor is mandatory.
The carburetor must be blown with compressed air before installation, and the needle and float must be checked. When installing, pay attention to the integrity of the gaskets between the carburetor and the intake manifold. The air suction in this unit is a common cause of unstable operation of the engine and cotton in the silencer.
- 🔌 Check the reliability of high-voltage wire contacts
- 💧 Make sure the fuel hose is tight.
- ⚙️ Adjust the quality and quantity of the mixture
- 🔩 Check the tightening of all the fastening elements of the intake system
Adjust the carburetor only on the warm engine. Start with the basic settings, wrapping the quality screws to the end (not much), and releasing them at 1-1.5 revolutions. spark plug and stability of idling.
When assembled, lubricate the cuff seals of the shaft and gear rod with plastic lubrication, which will prevent them from turning and damaging on the first start, and also facilitate the initial start of the engine.
Build lower unit and Reductor
Assembly lower unit When you install the propeller shaft, make sure that the strands are fully engaged, and if you're underpressed, you can cut the sleds or destroy the gears under load.
Replacing the oil in the gearbox is a mandatory procedure whenever you disassemble the engine. Use a special transmission oil for outboard motors. When filling, make sure that there is no emulsion (white), which indicates water entering. The oil should flow out of the upper hole clean and transparent.
⚠️ Attention: When assembling a data-dut check the condition of the thrust propeller bearings. Their wear leads to a backlash and a characteristic hum when moving, and can also cause the destruction of the ossels and water entering the gearbox.
Check the gearshift mechanism. The lever must be clear, smooth, and fixed in the forward, neutral and reverse positions. The clutch must be smooth, without jerking or sounding.
First start and break-in of the assembled motor
First start of the assembled motor orion It's best to make it on a stand or in a barrel of water to eliminate the risk of overheating and check the cooling system. Immediately after starting, make sure that the control hole is a stream of water, which indicates that it's working properly. pump And no traffic jams.
The running of a new or assembled engine is a critical step in determining its future life. Don't put a full load on it at once. The first hours of operation should be gentle, with periodic changes in speed.
High-quality break-in in the first 10 hours increases the life of the piston group up to 40% and provides stable compression throughout the life of the engine.
During the break-in, constantly monitor the engine temperature and the presence of extraneous noises. Vibration should be uniform, without sudden jerks. If you hear a knock or feel uneven work, immediately turn off the engine and conduct a diagnosis.
How often should you change the oil in the gearbox after assembly?
After the first assembly and running (the first 10 hours of operation), the oil in the gearbox must be replaced, which is due to the fact that metal shavings may appear in the gears during the grinding process, and then the replacement is made every 50-100 motor hours or once a season.
Can I use car spark plugs?
No, for outboard motors. orion Only special sea candles with a potash number that meets the manufacturer's requirements must be used. Car candles may not withstand the temperature regime and lead to a calamity ignition or failure of the insulator.
What to do if the engine smokes after assembly?
Heavy smoke in the first hours of operation is normal, as the conservation lubricant burns out and the rings are laundered. If the smoke persists for more than 5-10 hours, is black (over-enrichment) or accompanied by a loss of power, you need to check the settings of the carburetor and the condition of the piston group.