Owners of Lifan gasoline vehicles often face situations where a seemingly serviceable unit refuses to start. Chinese engines have a reputation for reliability and unpretentious, but they require compliance with certain operating rules, especially at the first start or after a long downtime. Ignoring basic inspection procedures can turn a simple operation into a long struggle with technology.
Before you start to actively repair or scrolle a starter, you need to understand the physical nature of the combustion process of the fuel-air mixture. An internal combustion engine is a system where all the elements are interconnected, and a failure in one node blocks the operation of the entire mechanism. In this article, we will discuss a step-by-step algorithm of actions that will help you start. Lifan in most state and non-state situations.
Special attention should be paid to environmental conditions, as air temperature directly affects the viscosity of oil and the evaporation of gasoline. Cold start in winter and hot restart in summer require diametrically opposite approaches to air damper control. Understanding these nuances will save you time and resources. starter.
Preparation for launch and verification of security systems
The first step should always be visual inspection and check of the levels of technical fluids. LifanLike any other unit, it won't start without spark and fuel, but it can also be blocked by protection systems. Make sure the throttle lever is in the correct position to match the engine temperature.
The critical thing is to check the engine oil level, and many models have an oil level sensor that force you to break the ignition circuit when you don't have enough, and if you don't have enough oil, the engine just won't spark, no matter how much you pull the starter cord. It's not a malfunction, it's a malfunction. defense-machineprevents the jamming of the piston group.
⚠️ Warning: Never attempt to bypass the oil level sensor or start the engine without it. Working without lubrication will cause permanent damage to the crankshaft and rods in seconds.
Also check the fuel in the tank and the condition of the fuel crane. A simple lack of gasoline or a closed crane are the most common causes of "sudden" breakdown. Make sure that the tank has fresh fuel, as old gasoline loses its octane properties and forms a resinous plaque.
☑️ Primary diagnosis before launch
Algorithm for starting a cold engine
Starting a cold engine requires enriching the fuel-air mixture, and the carburetor design has an air damper. Lifan After nighttime downtime or at temperatures below +10°C, the algorithm of actions must be strictly defined.
First, move the air damper lever to the position CLOSED (Closed) This will cut off the air, creating a dilution and pulling more gasoline into the combustion chamber. Then pull the starter handle smoothly but confidently. Don't pull the cord to the stop abruptly, it can damage the ratchet mechanism.
After the first flash or launch attempt, immediately return the air damper to position. OPEN (Open) or in the middle position. If you leave the valve closed, the engine will quickly fill the candle and die due to the re-enrichment of the mixture.
If the engine catches but stalls, try to quickly press the throttle lever several times during the starter scrolling, which will help blow the cylinder from excess fuel.
The table below shows the main provisions of the controls for the different temperature conditions:
| Air temperature | Position of air valve | Throttle situation | Post-launch action |
|---|---|---|---|
| Below +5°C | Closed (Closed) | 1/3 open open open | Open the shutter in 10-15 seconds |
| +5°C... +20°C | Closed (Closed) | Closed. | Open the valve immediately after start |
| Above +20°C | Open (Open) | Closed. | Smooth addition of gas |
| Hot restart. | Open (Open) | Full gas. | Just turn it around. |
Problems with the fuel system and carburetor
If the starter is spinning normally, there's a spark, but the engine is silent, the problem is the fuel supply. jelly They have microscopic holes that are easily clogged, and this is especially true for machinery that is stored with gasoline inside the tank.
In the long run, the lightweight fractions of gasoline evaporate, leaving behind a thick tar mass, which clogs the idling channels, and as a result, even if there is fuel in the float chamber, it does not enter the cylinder in the right amount. Visually, this can be determined by turning the candle: if it is dry, then the gasoline does not reach the combustion chamber.
Cleaning the carburetor without removal
In some cases, it helps to blow a carburetor with a special aerosol cleaner through the candle hole, which requires injecting a little money into the cylinder, quickly screwing the candle and trying to start the engine, but this is a temporary measure that does not replace full disassembly and ultrasonic cleaning.
Also worth checking is the fuel filter-settlement, which is often installed in front of the carburetor, if it is clogged with dirt or water, the flow of fuel will be blocked, the transparent filter housing allows you to visually assess the degree of pollution, the presence of water at the bottom of the filter is a sure sign of poor fuel or condensate.
⚠️ Warning: When working with carburetors and fuels, keep fire safety in mind: Gasoline vapors are heavier than air and can accumulate in lowlands, creating an explosive mixture.
Diagnostics of the ignition system
Lack of spark is second most popular cause of launch failure. Ignition system on engines Lifan It's usually electronic (CDI), which makes it reliable, but it's sensitive to high-voltage wires and candles, and the first thing you do is turn the spark plug and evaluate the condition.
If the candle electrodes are black and wet, it indicates a super-enriched mixture or poor combustion. If they are white or melted, the mixture is too poor or detonation burning has occurred. The normal color of the coar is brick-brown. The gap between the electrodes should be 0.7-0.8 mmThat can be tested with a probe.
To check the spark, apply a candle skirt to the metal part of the engine (mass) and pull the starter. The spark should be bright, blue-purple and accompanied by a characteristic crackle. A weak, orange spark or lack thereof indicates problems with the ignition coil, magneto or wire.
Owners often forget to check the grounding. Bad contact of the engine mass with the frame or generator can break the ignition circuit. Oxidized contacts on the terminals of the coil can also cause unstable operation.
Mechanical malfunctions and compression
If the fuel and spark are fine, but the engine doesn't start or start and immediately die, it's worth checking the compression. Low compression does not create the necessary pressure and temperature to ignite the mixture. piston-ring, cylinder swelling or loose fitting of valves.
Valve inspection – mandatory procedure for engines Lifan After the first hours of operation, and periodically during operation, the heat gaps of the valves decrease over time, the valve stops completely closing, and the compression goes into the collector. 0.10-0.15 mm (inlet) and 0.15-0.20 mm The engine often returns the engine to life.
It is also worth paying attention to the state of the gasket HBC. If it burns out, the engine will work unstable, white smoke may come from the exhaust pipe, and the oil in the crankcase will acquire an emulsion color, in which case the engine is prohibited until the gasket is replaced.
Adjusting valve gaps is the most frequent maintenance procedure required for every Lifan engine after 20-30 hours of operation, and ignoring this leads to power loss and difficult start-up.
Features of starting engines with electric starter
Electric starter models add another level of complexity, the electrical circuit. If nothing happens when you turn the key, first check the battery power. To start confidently, the starter needs a battery with a voltage of at least 12.5 V under load.
A common problem is poor contact on battery terminals or oxidation of the contacts of the starter relay. Clicking a relay without rotating the starter indicates that the circuit is closed, but the current does not pass through the starter windings due to poor contact or wear of the brushes of the electric motor itself.
Don't forget to lock. Many generator and motor vehicle models have an oil sensor that opens the starter circuit, and the ignition key may have an "OFF" position that blocks the start, and check the safety lock's integrity in the charge and start circuit, if it's designed.
Frequently Asked Questions (FAQ)
Why does the Lifan engine start and immediately stop?
It's probably a fuel system problem, check if the tank's sapoon is full (the vacuum keeps the gasoline from leaking), the idle jellies of the carburetor and the fuel level, and it could also be due to an incorrectly set ignition angle or too small valve gap.
How often should you change the oil in a Lifan engine?
The first oil change must be made after the first 5 hours of running, then the replacement is made every 20-30 hours or once a season, whichever comes first, use the viscosity oil SAE 10W-30 or 10W-40.
Can I fill the engine with AI-92 gasoline?
Yes, most modern engines Lifan series OHV (horizontal shaft) and V-Twin designed to work with gasoline AI-92. the use of AI-95 is not prohibited, but does not provide significant benefits, and AI-80 can cause detonation and overheating.
What to do if the starter's cable is broken?
You can't operate a ragged-line engine, because the starter spring can fly apart and cause injuries, you need to remove the starter body, carefully remove the remnants of the cable and spring, lubricate the mechanism and install a new cable of the appropriate length.