During the operation of the gasoline engine, various failures will occur due to the natural wear of the parts and improper use and maintenance. The fuel supply system and the ignition system often fail. Sometimes the two systems fail at the same time, and more complicated failures will occur, which brings certain difficulties to troubleshooting. The following first introduces the analysis and troubleshooting methods of oil circuit and circuit faults, and then briefly introduces the analysis and troubleshooting methods of common comprehensive faults.

Common troubleshooting methods for gasoline engine fuel supply system:

The fuel supply system of a gasoline engine is most prone to failure. Common faults are: no oil, too lean mixture and too thick mixture.

1, no oil.

1) The phenomenon

The internal combustion engine cannot be started.

After adding a small amount of gasoline to the carburetor, the machine can start, but it will stop soon.

2) The reason

① There is no oil in the gasoline tank.

② Oil pipe blockage

③ Damage of oil pipe or oil pipe joint causes serious oil leakage.

④If the gasoline filter is not cleaned for a long time or the gasoline tank is not cleaned, the impurities will block the tubing or filter.

⑤ The oil inlet pipe joint or the filter screen at the joint of the carburetor is blocked, the oil passages, the main oil measuring hole and the main nozzle are blocked, and the triangular oil needle is stuck in the triangular needle seat, causing no oil to enter.

3) Analysis and exclusion

First check whether there is oil in the gasoline tank and whether the oil switch is turned on. To find the blocked part of the oil circuit, generally use the method of segmented compression: unplug the oil pipe from the carburetor, let the unplugged end be lower than the position of the oil tank, and check whether the oil pipe is flowing. If there is no oil flowing out, the blocked part is in the oil pipe. Before, you can blow air into the oil pipe with your mouth, which can generally circulate. If the tubing is running oil. The clogging part is in the carburetor. The inside of the carburetor is blocked. You can check the oil inspection rod. Press the oil inspection rod to see that no oil flows out. The clogging point is at the oil inlet: oil flows out, and the clogging point is in the oil measuring hole or injection pipe. After the blockage is determined, the carburetor can be removed to eliminate the fault.

A gasoline engine equipped with a gasoline pump can also judge the blockage of the oil circuit by pumping oil by hand: if it feels light when pumping oil by hand, the blockage point is behind the gasoline pump: when pumping oil by hand, it feels heavy. The blockage point is before the gasoline pump.

2 Mixture is too lean

1) The phenomenon

The machine is not easy to start.

②After starting, when the throttle valve is opened, the carburetor will backfire, and it will improve when the choke valve is closed.

③The speed is unstable, the power drops, the machine temperature is high, and the exhaust sound is loud.

2) The reason

① The fuel tank to the carburetor is partially blocked or oil or air leakage. The carburetor is not tightly combined with the intake pipe, and the intake pipe is not tightly combined with the body, causing air leakage.

② The oil level in the float chamber is too low.

③ The main oil needle or idle oil needle is improperly adjusted, and the main oil measuring hole is partially blocked.

The gasoline pump is not working well.

⑤ The gasoline filter element is too dirty.

3) Analysis and exclusion

The mixture is too thin due to insufficient oil supply or poor oil circuit. If the carburetor has a backfire phenomenon, you can properly close the small damper, or press the oil test rod to increase gasoline.

At this time, if the carburetor tempering phenomenon disappears, it means that the mixture is too lean:

When the machine cannot be started or it is difficult to start (other parts of the machine are normal), the spark plug can be removed and a little gasoline can be injected from the spark plug seat hole. If it can be started after adding gasoline, it will automatically stop after starting or automatically stop after the throttle is opened. When it stops, it can be determined that the mixture is too thin. When checking, first check whether the fuel tank is short of oil, whether the oil circuit switch is turned on, whether the carburetor is installed flat, and whether the connecting screws between the carburetor and the cylinder are loose. Whether the sealing gasket is damaged and whether the main oil needle is over-tightened.

Before starting a gasoline engine equipped with a gasoline pump (such as a 1220 gasoline engine), you can judge whether the gasoline pump is working well or not by pumping oil by hand.

3 Mixture is too thick

1) The phenomenon

① The machine is not easy to start, remove the spark plug can find carbon deposits or gasoline around the electrode.

The exhaust pipe black smoke, and with a pungent smell of gasoline.

The speed is unstable, and not easy to improve, the sound is dull.

④ Insufficient power and increased fuel consumption.

2) The reason

Door not open

The air filter is too dirty and the filter screen is blocked.

Float chamber oil level too high

The main oil measuring hole increases due to wear, the main oil needle rotates too much, and the float breaks and sinks.

The triangular oil needle is not tightly closed, the oil needle seat is not tightened, and the gasket is broken.

3) Analysis and exclusion

When the mixture is too thick, you should first check the opening of the choke valve and adjust the oil needle. If there is no obvious effect, remove the air filter screen to see if the machine is improving. When the above methods are ineffective, finally check the oil level and measuring hole in the float chamber when the carburetor is removed.

Gasoline Generator Warranty

Warranty content:

If you buy the unit in the pure parts of the material or manufacturing on the unqualified, the company will give free repair. (Free repairs are hereinafter referred to as guaranteed repairs.) Guaranteed repairs are those that can be replaced by parts or repairs. In addition, the disassembled non-conforming products will be owned by the company.

Guarantee Period:

The period of acceptance of the warranty repair shall be within twelve months from the date of purchase of the goods. However, in the case of long-term, frequent business use, the guarantee period begins for six months.

Other Guarantees:

If the equipment you purchased is equipped with a battery, please note: when using the unit for the first time, the measured battery voltage should not be lower than 13 volts. if the starting is successful, the battery performance will be regarded as good and the supplier does not need to guarantee it. The unit equipped with the battery shall be operated at least once a month (not less than 15 minutes) to charge the battery to ensure the long-term normal operation of the battery. If the unit is not used for a long time, please maintain the battery separately.

Guaranteed scope of use:

This warranty applies only to units purchased for domestic use and will terminate if carried abroad.

Guaranteed repair method:

When you need to accept a guaranteed repair, please bring the unit and guarantee, or purchase invoice to the store where you purchased the goods or the Strang service point to apply for repair.

Effectiveness of Guarantee Services:

When the customer purchases the goods, both parties and the store shall fill in the necessary items on the purchase invoice and the guarantee letter and sign and seal them, then it will take effect.

Faults caused by the following reasons are not repaired:

◎ Not according to the instruction manual, decals, signs and other instructions to implement regular inspection and maintenance

◎ Not according to the instruction manual, decals, signs and other instructions to use the operation method

◎ Poor or wrong protection and maintenance

◎ When used, it exceeds the working limit undetermined by Strong.

◎ Transformed without strong's permission

◎ Failure caused by user's inattention

◎ The use of non-pure parts and non-specified grease

There is no warranty for the following:

◎ Aging phenomenon after a period of time (paint decoration surface, metal plating surface appear natural fading, etc.)

◎ General sensory phenomena (sound, vibration, oil smell, etc.) that do not affect quality and performance

◎ Problems caused by natural disasters such as typhoons and floods

◎ Problems caused by drugs, salt damage, etc.

Not to cover the costs and expenses:

◎ Consumables (fuel injectors, air filters, fuel filters, oil filters, lamps, pads, gaskets, fuses, brushes, etc. and consumables belonging to this category) and grease, etc.

◎ Repair carried out at the store where the goods were purchased or at a place other than the strong service point

◎ Overhaul, cleaning, adjustment and regular maintenance

◎ Inconvenience or loss caused by inability to use the machine (such as suspension of business or business loss, etc.)

◎ Compensation for expenses other than those specified in this guarantee

Attached: gasoline generator warranty card (pictured):

 

maintenance of gasoline generator:

1. gas. Intake and exhaust

l. Air intake. No matter what kind of gasoline generator is equipped with an air filter, because the engine needs to be mixed with gas without impurities according to regulations, it is absolutely not allowed to run the engine without an air filter, otherwise it will cause rapid engine wear. The air filter is divided into paper type and oil bath type. Paper-based use one

After the section, check whether the filter element is dirty or damaged, remove the dirt on the filter element, and replace the filter element if it cannot be removed. Oil bath type, after a period of use, the filter element can be cleaned with warm water with household detergent, then cleaned with clean water, and the filter element is thoroughly dried, then immersed in engine oil, and then the excess engine oil is squeezed out. If there is too much oil in the filter element, the engine will emit black smoke at the beginning of starting. If necessary, pour out the dirty oil in the air filter, clean it with a non-combustible or high-ignition detergent and dry it, and then add the recommended oil to the scale.

A throttle control handle is installed at the front of the engine. Generally, the throttle control handle is pushed to the left to adjust the amount of intake to control the mixing ratio of gasoline and air. The intake is too little, the oil is too thick, and the engine discharges thick Smoke or difficult to start. Too much air intake also causes the engine to ignite abnormally, affecting gas compression and unable to generate electricity normally.

2. Exhaust. Long-term use of the engine will also cause carbon deposits in the channel of the sound reducer, which will make the exhaust unsmooth. The carbon deposits must be scraped off and cleaned at a certain time.

2. oil. Fuel and lubricating oil

1. Fuel, generally use gasoline for automobiles, because gasoline will produce colloids and contain some other impurities during delivery and transportation. When refueling, a filter is generally installed at the fuel tank port, but in actual use, If you put a layer of medical gauze on the filter, the filtering effect is better.

Because gasoline is flammable and explosive under certain conditions, filling gasoline to the engine should be stopped and cooled before filling fuel in a well-ventilated place. No smoking, open flames or sparks when refueling. Fill the fuel tank and do not overflow the fuel tank (make sure there is no fuel at the fuel filler). After refilling, make sure that the fuel tank cap is closed. If fuel spills during refueling, wipe it clean and make sure that the engine is ventilated and dry before starting.

Generally, an auxiliary oil needle is installed on the top of the engine carburetor, and a main oil needle is installed on the bottom. The mixing ratio of fuel and air is adjusted by rotating the oil needle. The oil needle is screwed in and the oil is less, and the mixture becomes thinner; more oil is screwed out, The mixture becomes thicker. If the mixing ratio is too lean, the motive speed will be unstable; if the mixing ratio is too thick, the cylinder will emit thick smoke and the motive speed will slow down. When adjusting, first adjust the main oil needle and then adjust the auxiliary oil needle. When starting, first turn the main oil needle out 3-4 turns. After loading, slowly turn it in clockwise until the engine speed is stable. If the voltmeter is still above 5V and unstable, rotate the auxiliary oil needle, then slowly rotate it in until the speed is stable.

The mixture burned in the combustion chamber of a gasoline engine is required to have a rich and lean range. In order to express the rich and lean degree of the mixture, the excess air coefficient a is commonly used. That is: (excess air coefficient a-actual air volume L ÷ theoretical air volume L.), When the excess air coefficient is greater than 1, the mixture is lean, and when it is less than 1, it is rich. If it is greater than 1.4 or less than 0.4, the mixture will not be ignited.

2. Lubricating oil: Normal use of 4-stroke engine oil or high-quality engine oil that meets the SG and SF grades of the United States. It is recommended to use SAE1Ow3O engine oil, which is suitable for use under various temperature conditions. When checking, wipe the oil dipstick and insert it into the oil filler, but do not Screw in, if the oil level is too low, inject the recommended oil to the oil port. In addition, the oil grade selected for the mixed oil should be determined according to the different seasons, usually HQ1O to HQ -15 motor oil. After the lubricating oil is used for a certain period of time, the dirt caused by mechanical friction should be updated. When updating, remember to add engine oil and add engine oil to the oil dipstick to measure the capacity.

3. fire, engine ignition

Engine ignition uses the battery to connect the starter solenoid valve through the electric starter wire to start the engine and ignite with the magneto. When using a battery for ignition, a battery above 12V/35A should be selected, and pay attention to the positive and negative poles when connecting after disassembly, and pay attention to the electric starting wiring. Connect the positive pole of the battery first, then the negative pole, and connect the ground wire to the rear end of the generator. When loosening the wiring, first loosen the negative pole, and then loosen the positive pole. If the magneto is used for ignition, attention should be paid to the platinum gap of the breaker. The contact point is burnt and stained with dirt caused by long-term on-off, which will make the gap larger or smaller. If the ignition is abnormal, the contact surface can be wiped clean with No. 0 sand paper. If the platinum opening gap is too large or too small, the minimum gap can be adjusted to 0.02-0.05mm. In practical application, a piece of ordinary cigarette shell paper can be put into the platinum opening gap, and the thickness can be dragged back and forth freely. At this time, test the ignition system outside the cylinder, the spark should skip more than 6-8mm continuously, and the spark should be purple and white.

4. electricity. Generator line

When the generator is connected to the load, it should be noted that it cannot be connected to the load that exceeds the output power, and it cannot be connected to the household circuit casually to avoid damage to the motor or fire. If the generator is not used for a long time, the output will have no electricity. If the circuit is normal, it may be that the magnetic pole remanence of the motor disappears. Four 1.5V large flashlight batteries can be used to connect, reaching about 6V. When the generator is running, connect the positive wire of the battery to the "" end of the DC output of the air-loaded bridge rectifier, and connect the negative wire to the "one" end of the rectifier.

5. compression, cylinder and piston

The compression, combustion and work process of the mixture is completed by the combined operation of the cylinder and the piston. The cylinder is a working chamber that compresses and burns the gasified mixed gas to do work. The most common problem is spark plug carbon deposits. After the engine has been used for a period of time, if it cannot be started, the cylinder can be considered dirty. First check the spark plug, remove the carbon deposits, and adjust the spark plug gap to the value specified in the gas-oil generator manual. For example, the KIPOR Cape power gas oil generator is 0.7-0.8mm(0.028-0.031n), which is approximately the thickness of a three-layer postcard. LD75 type starter generator is specified between 0.3-0.4mm. When cleaning or replacing the spark plug, tighten the spark plug first to prevent the thread from being wrong, and then tighten it with the spark plug wrench to tighten the gasket. Note that the spark plug must be tightened, otherwise it may become very hot and may damage the engine.

6. use. Start and stop the engine correctly

1. Starter generator:(1) Turn the fuel switch to the "on" position;(2) Move the choke valve;(3) Push the throttle control handle to the left;(4-) Start the engine, A, recoil manual Start, turn the engine switch to the "on" position, gently pull the starting handle until you feel pressure, and then pull it quickly. Take care to prevent the handle from rebounding violently and hitting the engine. Put the handle back slowly to prevent damage to the pull plate shell. B. Electric starting, turn the engine switch to the starting position until the engine starts. Note that each start does not exceed 5 seconds. If it fails, wait for 10 seconds before starting. When the engine is started, turn the switch to the ON (start) position. When the engine is warm, move the choke handle to the ON position. Then set the throttle valve control handle to the desired engine speed position.

2. Stop the engine: If it is stopped in an emergency, turn the engine switch to the "off" position. Stop under normal conditions:(1) Close the throttle and push the throttle control handle to the right;(2) Turn the engine switch to the "off" position;(3) Turn the fuel switch to the "off" position. For the correct start or stop of different types of engines, it is necessary to read the operating instructions of the model to help correctly grasp the method of use and avoid accidents that should not occur.