When choosing a power plant for small mechanization, whether it is a motor unit, a pump station or a homemade boat, many users pay attention to Chinese internal combustion engines. Lifan engine 8 hp with vertical shaftThe LF168 or LF170 series is often labeled as the LF168 or LF170 series, depending on the specific modification and year of production, and has proven to be a reliable and unpretentious unit capable of operating in harsh operating conditions.
The versatility of the vertical crankshaft design allows this motor to be used in a wide range of tasks where torque is required downwards, for example, on a snowthrower auger or a pump impeller. Lifan It has a number of design features in the lubrication and gas distribution system, which must be taken into account during the first start-up and subsequent maintenance.
In this article, we will discuss in detail the technical nuances, running procedures and typical problems that the owner of this equipment may face. A competent approach to operation will significantly extend the life of the nodes and avoid expensive repairs in the future.
Technical specifications and design features
The heart of the unit is a single-cylinder four-stroke gasoline engine with forced air cooling. Vertical shaft It has standard sizes for this class, which ensures compatibility with most gearboxes and attachments. 8 horsepower is achieved at optimal speeds, usually 3600 rpm, which is the standard for industrial engines of this volume.
The lubrication system is splashed, requiring strict control of the oil level, and uses an OHV (OverHead Valve) valve, which provides a more complete combustion of the fuel mixture and reduces noise levels compared to side valve counterparts. The engine capacity of the Lifan 8 hp is usually 270 cc (model LF168F-2 or analogues), which distinguishes it from the weaker 200 cc versions.
The launch system is worth special attention. Most models have a manual starter with a return spring, but there are modifications with an electric starter. The float-type carburetor design allows the engine to work steadily even at small inclinations, but critical rolling angles can lead to fuel outages or oil starvation.
⚠️ Attention: Do not start the engine without oil or at a level below the minimum mark. Protection system may be absent in basic configurations, which will lead to instant jamming of the piston group.
Procedure for proper engine break-in
The first hours of operation are critical to forming the right gap between rubbing parts. break-in It's not just a formality, it's a necessary process of grinding piston rings, cylinders and crankshaft bearings, and ignoring this stage can lead to increased oil consumption and loss of compression in the future.
The process begins with checking all threaded connections, as they may have weakened during transportation and vibration, and after filling with quality AI-92 gasoline and oil (usually 10W-30 or 10W-40 for four-strokes), the engine is started and let it warm up at idle speeds.
During the first 5-8 hours of operation, it is not recommended to load the engine to more than 50% of its maximum power. Lifan 8bhp engine. Do not use virgin soil or pump to full capacity immediately after purchase.
☑️ Checklist of primary launch and break-in
Setup and maintenance of the carburetor
The stability of the power unit depends on the quality of the preparation of the fuel air mixture. A carburetor is a unit that requires periodic adjustment, especially after winter storage or when operating conditions change (for example, working at high altitude above sea level).
The carburetor body usually has two main adjusting screws: the mix quality screw and the idling speed screw. To properly adjust the engine, you must preheat it to operating temperature. Then, rotating the quality screw, you find the position at which the engine speed is maximum, after which the number screw sets the necessary idling speeds.
If the engine stalls when the valve is opened abruptly or is not operating stable, it may be necessary to clean the jelly. Low quality gasoline often leads to the formation of resinous deposits that clog thin channels. In such cases, it is recommended to use special carburetor cleaners or to perform a complete disassembly of the unit.
Symptoms of improper tuning of the carburetor
Black smoke from the exhaust pipe indicates a re-enriched mixture (lots of gasoline, little air). White or grey smoke may indicate oil burning, which indicates problems with the piston group or the wrong level of oil. Cottons in the muffler are also often caused by a rich mixture.
Ignition system and fault-resolving
In the engine. Lifan 8bhp. It uses electronic ignition (magneto), which does not require an external power source to spark, which makes the system reliable, but it is sensitive to the state of the candles and the gap between the electrodes.
If the engine does not start, the first thing to do is to unscrew the spark plug and check for a spark, apply the threaded part of the candle to the metal part of the engine (mass) and sharply pull the starter. The absence of a spark may indicate a malfunction of the ignition coil, contamination of the candle or a wire break.
A common problem is the sugar on the electrodes of the candle, which is formed due to prolonged idling or the use of oil with inappropriate additives. Regular cleaning or replacing the candle with an analogue with the correct potassium number helps to avoid ignition misses.
| Problem. | Possible cause | Method of decision |
|---|---|---|
| The engine won't start. | No fuel or spark. | Check the tap, oil level, candle |
| Unstable turnovers | Carburetor clogged | Wash the jelly and canals |
| Vibration is strong. | Weakened attachment | Tighten engine mount bolts |
| Smoke from the exhaust | Reciprocating wear | Defective CNG, ring replacement |
Oil Replacement and Regular Work
Timely replacement of motor oil - the key to longevity vertical-engineUnlike two-stroke engines, oil doesn't burn, it circulates in the crankcase, lubricating the fumes that rub, but it loses its properties over time, gets contaminated with combustion products and metal shavings.
The first oil change must be made after the first 5 hours of operation (after running). Subsequent replacements are recommended every 25-50 hours or at the end of the season, before the equipment is put into storage. Lifan engines with a volume of about 270 cubic cm usually require about 0.6 liters of oil.
When choosing a lubricant, the ambient temperature should be guided. In summer, oils with a viscosity of SAE 30 are optimal, and for all-season use - 10W-30. The use of oils with an API class at least SJ or SL will provide the necessary protection of parts.
Pour the oil right after work while the engine is warm. Cold oil is more viscous and drains longer, leaving more contaminants in the crankcase.
⚠️ Attention: When twisting a drain bolt or a probe plug, do not put excessive effort into the aluminum crankcase easily damage, which will lead to leaks and the need to replace the entire bottom of the engine.
Winter storage and conservation
If you plan not to use the equipment in the winter, you need to properly conserve. liphanThe gasoline left in the carburetor in a few months turns into a viscous substance that completely clogs the jellyplants.
For conservation, it is recommended to produce all the gasoline from the float chamber, allowing the engine to stall on its own after the fuel crane is blocked. It is also worth twisting out the candle and pouring several blocks of engine oil into the cylinder, after which slowly turn the crankshaft and twist the candle back.
Store the unit in a dry room, protecting the exhaust hole and air filter from moisture and rodents. Proper preservation ensures that in the spring 8hp engine It will start the first time and be ready to go.
The main enemy of the engine when stored is old gasoline. Always drain the fuel or use stabilizers if the equipment is idle for more than 30 days.
Frequently Asked Questions (FAQ)
What is the best oil to use into the Lifan 8 hp engine?
For four-stroke Lifan engines, it is recommended to use engine oils for gasoline engines with a viscosity class of 10W-30 or 10W-40 (depending on the season) and API quality class of SJ, SL or higher. It is important that the oil is designed specifically for four-stroke engines, and not for two-stroke (where oil is mixed with gasoline).
Why does the engine stop when the valve is opened?
This is most often a sign of clogging of the carburetor's main fuel jelly or the presence of water in the fuel, and it may also be due to improper adjustment of the mix quality screw or the pumping of extraneous air through the carburetor's gasket.
Can this engine be installed horizontally?
No, vertical-shaft It is not designed to operate in a horizontal position, and in this position, the spray lubrication system will no longer effectively supply oil to the crankshaft bearings and camshaft cams, leading to rapid failure.
What kind of spark plug is suitable for Lifan?
Standardly, these engines use candles with a thread M14 and a thread length of 19 mm (for example, Torch A7RTC or analogues from NGK, Bosch). The exact type of candle is better specified in the instructions for a particular model or look at the marking on the twisted factory candle.