Outboard Motors salute Retro vehicles have earned a reputation for being "unkillable" in Soviet times, but even the most durable equipment needs attention after decades of operation. Owners of retro vehicles often face the need to restore components that have long been discontinued but remain indispensable for light aluminum boats. Competent diagnostic approach allows you to extend the life of the engine for many years, turning it into a reliable source of traction on the water.
The process of restoring working capacity begins long before you pick up the wrench. Technical status The engine depends on the quality of the fuel and oil used, as well as on the storage conditions in winter, and ignoring simple conservation rules leads to oxidation of contacts and coking of channels, which greatly complicates subsequent start-up.
In this article, we will look at the key maintenance aspects that every motor owner faces, and learn how to distinguish a minor malfunction from a major malfunction that requires specialist intervention. Critically important point is tightness of the crankcase: loss of compression in the two-stroke engine is often caused by the stratification of rubber cuffs with prolonged downtime.
Diagnostics of major engine malfunctions
The first step in any repair is to accurately identify the symptoms. The engine may not start, stall on the go or lose power under load. Often the problem lies in the fuel supply system, where over the years of operation, paraffin deposits or membranes may have been oxidized. Visual inspection of spark plugs can tell a lot about the condition of the cylinder-piston group: black plaque will indicate over-enriched mixture, and white – on overheating or using improper oil.
Don't ignore the noises that come with the operation, knocking at the bottom of the motor often indicates wear on the bearings of the crankshaft or the rod group, and if you hear a whistle or a hum, it can be a sign of problems with the cooling system or cavitation of the screw. Diagnostics It should be done consistently, excluding simple causes before disassembling complex nodes.
Special attention should be paid to the compression test, low cylinder pressure indicates wear of piston rings or damage to the mirror surface of the cylinder. salute It's a very sensitive crankshaft seal, which causes air to suck and the mixture to become impoverished, and it's a must-have before major repairs.
Adjustment and cleaning of the carburetor
The carburetor is the heart of the fuel system, and the right setup determines the efficiency and the acceptability of the engine. Over time, resinous plaque accumulates in the float chamber, which clogs the jelly and idle channels. To clean, you need to use specialized solvents and blow all the channels with compressed air. It is not recommended to use metal objects to clean the jellyclera, as this can change their throughput.
The adjustment process begins with the installation of a quality fuel level in the float chamber, and the wrong level will lead to either overflow and a rich mixture, or fuel starvation at high speeds. Adjustment The quality of the mixture is produced by screws on the running and warmed engine, and it is important to find a balance in which the motor keeps idling steadily and reacts sharply to the opening of the throttle.
When assembling a carburetor, always use a new remix of gaskets, as the old ones tan and do not provide tightness, which leads to air sucking.
Owners often forget about the condition of the fuel filter-sludge located in front of the carburetor. A clogged filter creates a vacuum that a membrane pump can not always overcome, especially at high revs. Regular replacement of the mesh filter and checking the elasticity of the fuel hoses will prevent many problems with starting.
☑️ Carburettor maintenance
Maintenance of the ignition system
outboard motor ignition system salute It's usually built on a magdino with a breaker or an electronic unit. In the classic versions with contacts, it's important to monitor the condition of the tungsten pens and the angle of their opening. The garment on the contacts leads to unstable spark formation and ignition failures. The gap between the contacts should be strictly within the limits specified in the technical data sheet, usually 0.3-0.4 mm.
Electronic systems are more reliable, but they also require inspection. Capacitors and thyristors can fail when they overheat or surge. Checking the ignition coil on the insulation breakdown is an important procedure. If the spark is weak or disappears after warming up, the problem may lie in the thermal breakdown of the coil or ignition module. Ignition system It should provide a powerful spark even at low knee speeds.
⚠️ Warning: When checking the ignition system, never hold a high-voltage wire in your hands or with forceps without grounding. The discharge may not be fatal, but will cause severe muscle spasm, which is dangerous on a slippery dock or in a boat.
Don't forget the spark plugs. salute It is recommended to use candles with a potassium number corresponding to the thermal mode of the engine. Installing too "hot" candles will lead to the burning of the piston, and "cold" will quickly become covered with soot. Regular replacement of candles is the easiest way to improve engine performance.
Repair of lower unit and Reductor
The lower part of the motor, or lower unit, is subjected to the most severe loads, including impacts on underwater obstacles and abrasive water. The main node here is the gearbox that transmits rotation from the engine shaft to the propeller. Periodic change of oil in the gearbox is mandatory: if an emulsion (the color "coffee with milk") appears in the oil, this is a signal that water enters through the oil coils. Operating the motor with water in the gearbox will quickly disable the gears and bearings.
Replacing the ossels is a procedure that requires care and cleanliness. Old cuffs lose their elasticity and start to leak water. When installing new ossels, it is important not to damage their working edge and plant them correctly on the shaft. gearbox It must be completely sealed, as the water inside leads to corrosion and jamming of the gearshift mechanism.
| Node. | Type of lubricant | Replacement interval | Signs of malfunction |
|---|---|---|---|
| gearbox | Transmission oil (TAD-17 or analogue) | Once a season or 100 motor hours | Emulsion in oil, noise, backlash of the screw |
| Crawler bearings | Lithol-24 or special lubricant | Major renovations | Knocking, vibration, loss of compression |
| Needle bearing | Oil for two-stroke engines | Every time you disassemble. | Blows on the finger, knocking on the piston |
| The propeller shaft | Lubrication for water-resistant knots | Every year. | The oil leak from Daydwood |
The propeller also requires inspection. The burrs on the blades reduce efficiency and create cavitation cavities that destroy metal. The deformations can be controlled, but deep chips require replacement of the screw. The screw balancing is important to reduce the vibration that is destructive to the bearings of lower unit.
The Secret of Long-Life Reductor
After each outing, especially in salt water, it is useful to wash lower unit with fresh water outside, and it is also recommended to keep the motor in an upright position so that the water is completely glass and does not stagnate in the area of the glands.
Removing overheating and pump maintenance
Engine cooling system salute The pump is located in a lower unit and is driven by a crankshaft. The main cause of overheating is the destruction of the rubber impeller pump. The rubber eventually swells and crumbles, stopping pumping water. Also, the water intakes in the body of the lower unit are often clogged with algae or sand.
If the motor is running at higher speeds, but the flow of water from the control hole is weak or absent, it is urgent to stop the engine. Overheating It is also dangerous for the coils, which at high temperatures lose their properties and begin to pass water into the crankcase.
When you service the pump, you need to look at the state of the pipe that feeds water from the pump to the engine, and often the inner layer peels off inside this rubber hose, creating a valve that blocks the flow of water, and you need to replace the pipe and the impellers with a kit for every major maintenance.
⚠️ Warning: Never run the engine dry for even a few seconds to check for a spark unless the cooling system is filled with water, guaranteed to damage the impeller pump.
Assembly, running and final testing
After the repairs are completed and the worn parts are replaced, the assembly phase begins, where the purity and the observance of the tightening of the bolts are important. Pay special attention to the installation of gaskets between the crankcase, cylinder and head. The use of a sealant is only permissible special, heat-resistant, and it must be applied in a thin layer without clogging the oil channels. Assembly It must be made in a clean room so that dust does not get inside the engine.
The first start after repair is critical. The engine must be started on a barrel of water, providing a good head for cooling. The first 10-15 minutes, the engine must run at speeds just above idle, without sharp openings of the throttle. This is necessary to burn new parts and remove the residues of the assembly lubricant. The running mixture must contain an increased amount of oil (a ratio of 1:25 instead of the standard 1:50).
Successful break-in determines the life of the engine after repair: the first 3 fuel tanks use a gentle mode of operation, avoiding full opening of the throttle and long idling.
The final test is water-based, check the engine's loading, no overheating, idling stability, and gear shift clarity, if all parameters are normal, the engine can be considered restored, and regular maintenance after repair will allow you to forget about the problems for long seasons.
Frequently Asked Questions (FAQ)
Which oil is best used for a mixture with gasoline in the Salyut engine?
For old two-stroke engines salute Optimally use mineral oils for air-cooled two-stroke engines (API TC or JASO FB/FC designation). Synthetic oils may not provide sufficient lubrication for older bearings and glands designed for more viscous mineral compositions. The mixing ratio is usually 1:40 or 1:50 depending on the condition of the engine.
Why does the engine stop when the gas is opened?
Most often, this is a clogging of the carburetor's main fuel jelly or the presence of water in the fuel, and it can also be due to the incorrectly tuned level of the float or the air sucking through the gasket between the carburetor and the engine. Check the fuel filter and blow out the jelly.
Can I use car spark plugs?
Car candles are strongly discouraged, they have a different kalyl number and threads, installing an inappropriate candle will either cause a quick gas buildup or cause a thermal breakdown of the piston, use only the candles recommended by the manufacturer, such as the A11-3 or their modern counterparts for outboard motors.
How often should I change my hair in the garden?
It is recommended to change the diewood and crankshaft glands at each complete disassembly of the engine or at least once every 3-5 years of active operation. If you notice an oil film on the water behind the boat or an emulsion in gear oil, you need to make a replacement immediately, regardless of the service life.