How to remove the piston from a power tiller

Correct Piston Installation on a Single Axle Tractor

Piston rings are important components of the engine. They seal between the piston and the inner wall of the cylinder liner over the entire surface. Engines in which the work cycle is performed for 4 stroke usually have 3 rings (2 compression and one scraper).

Chinese company Lifan (Lifan). a large corporation with many businesses, from small cars to buses. At the same time, it is also a supplier of engines for a large number of small businesses that produce agricultural machinery and small vehicles.

According to the common tradition of Chinese industry, instead of its own development, a successful model is copied, usually Japanese.

The widespread 168F engine, found on a large number of power tools, cultivators, portable generators and motor pumps, is no exception: the Honda GX200 was the model at the time of its creation.

Lifan’s general description

Its cylinder is built into the crankcase of the engine, which, despite the theoretical possibility of replacing the cast-iron liner, significantly reduces its repairability when worn out.

The engine is forced-air-cooled, with sufficient performance in hot climates, even at high loads.

over, the specific fuel consumption in these engines is 395 g / kWh, that is, per hour of operation at rated power of 4 kW (5.4 l.с.) at 2500 rpm they consume 1.1 liters of fuel per hour from the right carburetor. set up.

The 168F motor family currently includes 7 models with different configuration parameters and connection sizes, which have the following features:

Lifan 168F-2

The cheapest equipment with a camshaft size of 19 or 20 mm. The price from the manufacturer is 9100

For more information on Lifan 168F-2 engine performance, see.

Lifan 168F-2 7A

Motor variant equipped with a lighting coil, capable of powering consumers up to 90 watts. This allows it to be used in a variety of techniques that require light: motocross towing, light bogs, etc. Д. Price 11,600 Shaft diameter 20mm.

Lifan 168F-2 ignition diagram

The power unit has a tapered exhaust shaft, which differs from the basic model only by the tapered groove of the crankshaft pin, which provides a more accurate and tight fit of the pulleys. Price 9500

Lifan 168F-2L

This motor has a built-in gearbox with a 22mm output shaft bore and costs 12,100.

Lifan168F-2R motor

The motor is also equipped with a gearbox, but with an automatic centrifugal clutch, and the landing size of the secondary shaft of the gearbox. 20 mm. Engine price: 14,900

Lifan 168F-2R 7A

As you can see from the markings, this version of the engine, in addition to the gearbox with automatic clutch mechanism, has a seven-amp light coil, which increases its price to 16,500.

Lifan 168FD-2R 7A

The most expensive version of the engine at a price of 21,500 differs not only in the diameter of the output shaft of the gearbox, increased to 22 mm, but also the presence of an electric starter. At the same time, the rectifier needed to charge the battery is not included.

Repair and adjustment, adjustment speed

Sooner or later, any engine block is waiting for an engine repair, whether it’s a Caiman, Patriot, Texas, Foreman, VIKING, Forza or some other. The disassembly and troubleshooting is simple and does not require special tools.

It should be noted that the manufacturer does not specify specific wear limits for troubleshooting any engine components, so the dimensions listed below are similar to other air-cooled four-stroke engines:

How it works?

To figure out the breakdowns and fix them, it’s important to understand how things work in a normal situation. Let’s dwell for simplicity only on models with an internal combustion engine. Previously there were two-stroke motor blocks, but now they are increasingly superseded by four-stroke counterparts. Diesel units are also gaining popularity. As for the transmission, it can be performed in three different versions.

The traditional approach is to use a cogged transmission. Despite a decent level of reliability, this machine takes up a lot of space. The transfer of force takes place by means of either a cone or a cylinder. Lightweight blocks are generally fitted with a toothed worm transmission. A typical motoblock regulator principle contains:

The control unit acts on the basis of a pneumatic or mechanical connection. “Pneumatics” means a kind of wing that reacts to the speed of the air flow. Centrifugal versions involve placing a special camshaft inside the crankcase. It is supplemented by small weights and an easy to move rod. The pull is made of wire, and the sensitivity of the spring determines how accurately the revolutions will be maintained.

The role of the camshaft transmission is to supply the air-fuel mixture to the cylinder. But the same device also ensures that the exhaust gases are evacuated. To influence the compression ratio, a decompressor is used. Gasoline engines are necessarily equipped with carburetors, responsible for the preparation of the fuel-air mixture. Regardless of the type of fuel, the starter is important.

Eliminating starting problems

Often the repair of the engine of a motorblock is needed because this motor does not start. If such a problem occurs after winter storage, you may suspect:

  • Fuel or oil clogged with water;
  • Oxidation of electrical contacts;
  • damage to the insulation;
  • Solid debris in the carburetor.
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In order to prevent these irregularities a careful inspection of all connections is essential before each start-up. Noticing the slightest clamping of the cable, especially its kinking, you can not start the engine.

Before the first start-up it is a good idea to check that the oil in the crankcase is sufficient. If it is insufficient, rapid destruction of the piston group is likely. In less than a second the cylinders are covered with burrs.

In this case it is required a very serious repair, and sometimes even the replacement of damaged parts. Sometimes instability in the functioning of the machine is provoked by leaving the lubricant for the winter. If this is the reason, for the first few moments after start-up there are puffs of white smoke coming out of the exhaust pipe. Immediately after that the power plant will stop.

Diesel motoblocs may also not start due to lack of oil. Only few models are equipped with systems that prevent the lubrication level from dropping. Most people will have to monitor the serviceability of their power tillers by themselves. It is also worth noting that malfunctions are caused by the systematic use of unsuitable fuel. If the usual recommendations don’t have much effect, you need to remove the plug and see if there are any oil spots.

The oil, especially the soot, should be carefully cleaned off. Then the spark plug must be dried. The cylinder also needs to be dried. As a “drying” is used a very simple method: repeated sharp pulling of the starter rope. Often the question arises: what to do if the single-axle tractor does not start, with black smoke.

This manifestation usually indicates that the engine has overfilled with gasoline. You should also be wary of damage to the piston group. If both assumptions turned out to be wrong, it is necessary to contact the service center. Further attempts to troubleshoot on their own can lead to an aggravation of the failure.

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When the irregularities are associated with a lack of fuel in the working chamber, the spark plug will be dry.

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You can fight with such a problem if:

  • pour out the previous fuel;
  • thoroughly clean the gasoline or diesel tank;
  • clean the air filter;
  • Clean the fuel hose and nozzles with a jet of compressed air;
  • add fresh fuel;
  • after opening the fuel line, blow out the channel located in the gasoline tank lid.

In some cases the failure is due to gasoline getting into the oil sump. Check for this problem after any adjustment, adjustment of the carburetor.

Power tiller engine crank shaft open

If the clogging of the lubricant with fuel occurs constantly, it is necessary to look at the carburetor needle. It is likely that just this assembly has become a weak point. It is worth noting that sometimes the motoblock motor also shoots into the muffler, and maybe even with a flame.

The most likely cause is incomplete combustion. It is provoked:

When the single-axle tractor is still unwilling to act, ignition system failures must be searched for thoughtfully and consistently. Inspect the magneto, caps, spark plugs and high-voltage wires.

It is of primary importance to look for even minor impurities. If everything is clean, you need to inspect the ignition wire contacts. Next, the stability of the electrodes is checked, measuring the distance between them with a special stylus.

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Problems with the manual starter

Sometimes it is necessary to replace the starter spring or even the entire machine. The spring itself is located around the axle of the drum. The purpose of this spring is to return the drums to their original position. If the mechanism is taken care of and does not jerk it too actively, the device runs quietly for years. If a breakdown occurs, it is necessary to first remove the washer located in the middle of the drum housing.

Then they take off the cover and look carefully at all the parts. Attention: it is better to prepare a box in which the removed parts will be placed. There are a lot of them and they are small. After repairing it will be necessary to install everything back, otherwise the starter will stop working at all. In most cases it is necessary to replace the spring or the cord, but this can only be concluded with a visual inspection.

Although the Cascade power harvesters are equipped with strong cords, you can not rule out a tear. But if the cord is relatively easy to change, then when replacing the spring, you must be careful not to damage the connecting hooks. When replacing the whole starter first remove the filter covering the flywheel. This allows you to get to the internal parts of the device. After removing the hood, unscrew the screws that hold the basket.

Advantages of Chinese engines

Chinese engines for power tillers are extremely popular because of their advantages. Depending on their purpose motors are equipped with additional equipment (gearboxes, starters, etc.) and accessories.). Only the latest equipment is used in the production of engines. Buy such a motor, you can immediately use it without any additional training. They are perfectly suitable for all types of power tillers, even for home power tillers.

Other common starting problems

What to do if the motor of a motorblock works intermittently and does not develop the necessary power? There may be several reasons for this behavior:

The air does not get into the carburetor, which means that the fuel burns poorly. the filter will have to be cleaned or replaced.

Fuel residue and combustion products form a thick deposit on the inner walls of the muffler, which must be removed.

In this case, the assembly will have to be removed, disassembled and all of its components cleaned properly. After that, the carburetor must be assembled and properly adjusted.

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Temperature and stress can take their toll and even the toughest metals will wear out and deform over time. Such parts should be replaced immediately, otherwise you can pay for it with irreparable breakdowns in the engine itself.

This problem is indicated by a lack of crankshaft movement when starting the engine. To replace the clutch housing and ratchet, you will have to completely disassemble the starter assembly.

If the starter cord does not return to its original position, the starter needs to be adjusted. To do this, the screws are loosened, and the position of the assembly is set by hand so as to ensure the normal return of the cord.

A fairly common reason for the lack of return stroke of the starter cord is the failure of the starter spring. it will have to be replaced.

Proper maintenance of its major assemblies and components considerably increases the service life of any equipment. Of no small importance is the speed of replacing worn parts. Therefore, if the slightest failures and malfunctions occur, deal with them immediately. in the end, this will prevent much more serious and expensive problems.

Cascade motorblock engine repair video. Together we make

The problems of the motor block can be divided into two types: malfunctions of the motor and malfunctions of the various mechanisms and assemblies. If you have such equipment, then there is a high probability that in the process of using it you may encounter some problems with the engine. The Cascade motorblock repair instructions in this article will help you understand what problems the engine may have had, as well as how to fix them.

Engine trouble

Motor problems can be indicated by spontaneous stopping, lack of power levels and interruptions:

  • If the unit has a gasoline engine, then in the search for problems you need to check whether there is fuel in the tank, what is the state of the special flap of the device, how the ignition start is performed, whether the fuel passes into the carburetor.
  • To check the final condition, you need to fill a special chamber, engaging a single button. The fuel should come out of the hole in the cap of this chamber. If the fuel comes in a small stream or you cannot see it at all, it could be a problem with the fuel filter or a clogged valve of the device. Recommendation for repairing this power tiller in such a case advises cleaning the valve or filter.

Problems with the passage of fuel

About the fact that the fuel enters the engine cylinder, can indicate the condition of the spark plug. It should be checked by unscrewing it from the cylinder cap, having previously attached a wire. If the spark plug is dry, it means that the fuel is not getting into the cylinder. If you managed to find out that it passes into the carburetor, then the main reason for the engine’s failure to start may be the clogging of the filter screen of the device.

kamco power tiller piston rings replacement

Sometimes clogged jets lead to serious problems. If all the conditions are met, the instructions for repairing the power tiller include the possibility of removing the carburetor, disassembling and cleaning the part. You can perform these manipulations without visiting a master.

Checking the spark plug condition

The recommendation on the repair of the unit, which you should study before carrying out the work, will help you to understand how to perform the inspection of the condition of the spark plug. If it is wet, the gasoline passes into the cylinder. Failure to start can be due to an excess of special mixture.

If the surface of the spark plug is heavily covered with gasoline, you need to dry the cylinders, pump the engine with the starter, leaving the spark plug turned out.

Before this manipulation, the master must close the fuel supply. The spark plug may be clogged with sludge and it can be cleaned with a sandpaper and gasoline. The main thing is to analyze the value of the gap between the electrodes. If necessary, it is worth making adjustments, following the rules presented by the manufacturer in the manual. The gap size should be 0.8 mm.

Problems with the ignition system

The ignition of such a device can also fail. If this is the case, you need to check the condition of the plug, clean it and start adjusting the gap. At the same time it will be necessary to analyze whether there are breakdowns in the electrical circuit. The master should see what gap is preserved between the magnet wire and coil. Different models of the selected manufacturer have recommendations for such work, and they are indicated in the manual.

Problems with the carburetor

The carburetor of the motorblock may be dirty, in many cases it may not be properly adjusted. If so, such an assembly is removed and cleaned, and its adjustment is made, which should be required by the regulations:

    There may be another problem, which is expressed in the fact that the air in the carburetor passes in an incomplete volume. This can happen because the air filter is clogged, eventually the fuel mixture comes out over-enriched.

Depending on the material in the base, it is necessary to rid the part of dirt by one of the effective ways. If the carburetor of the device began to receive air in small quantities, you may need to clean the paper filter, which is done by light tapping or blowing.

Here you have learned how to repair the power tiller “Cascade”.

Cascade” motor-blocks have proven themselves with the best side. But even these reliable and unpretentious devices sometimes fail. It is very important for the owners to determine the causes of failure, to understand whether they can solve the problem on their own or not.

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The unit does not work or works erratically

It is logical to begin the analysis of possible breakdowns with the following situation: a single-axle tractor “Cascade” starts and immediately stops. Or just stopped to start the engine. The following causes are most likely:

  • Excessive gasoline (indicated by the moisture of the spark plugs);
  • in models with an electric starter the problem is often caused by a low battery;
  • the total horsepower of the engine is insufficient;
  • The muffler malfunction.

Faulty engine systems at startup

If the spark plugs are moist when you check them, or if they are wet, or if the spark plugs are damaged.е. fuel is flowing normally but the engine will not start, the problem may be

  • If the brake pedal is released and the engine is running, the brake servo system may need to be repaired.

If a leak is detected, tighten the mounting bolts, tighten the spark plugs and check the integrity of the gaskets between the spark plug heads and cylinders.

To fix this problem, you need to ensure the free movement of the flap, checking the quality of the drive. If a blockage is detected, it must be corrected.

Compression problems and carburetor malfunctions

It happens that the start is carried out, but its process is significantly hampered. In this case, the motoblock engine runs extremely unstable and can not develop sufficient power for normal operation.

The reason for this can be a loss of compression, which can be detected by:

In order to restore compression, it is necessary to:

  • Check the technical condition of the engine timing mechanism. Clean soiled components and replace if defective.
  • Check the condition of the piston rings and replace faulty components.

If during engine operation black smoke is coming out of the muffler, and excessive oil on the electrodes of the spark plugs or they themselves are covered with soot, it means that

  • an oversaturated fuel mixture is supplied to the carburetor;
  • The sealing of the fuel valve of the carburetor is broken;
  • The piston liner is worn out;
  • the air filter is clogged.

To correct starting problems

The engine of a power tiller often needs to be repaired because it won’t start. If this problem occurs after winter storage, suspect

  • Fuel or oil is clogged with water;
  • oxidation of electrical contacts;
  • Damage to the insulation;
  • Solid debris in the carburetor.

To prevent these problems, you must carefully inspect any connections before each startup. If you notice the slightest tightness in the cable, especially if it is twisted, do not start the engine.

Even before the first start-up, you should check that the oil in the crankcase is sufficient. If it is insufficient, rapid destruction of the piston group is likely. Cylinders are covered with burrs in less than a second.

In this case, you need a very serious repair, and sometimes even the replacement of damaged parts. Sometimes instability in the functioning of the machine is provoked by leaving the lubricant for the winter. If this is the reason, for the first few moments after start-up there are puffs of white smoke coming out of the exhaust pipe. Immediately after that the power plant stops.

Diesel power tillers may also fail to start due to lack of oil. Only a few models are equipped with systems to prevent the lubricant level from dropping. Most people will have to check the serviceability of their power tiller by themselves. It is also worth considering that malfunctions occur due to the systematic use of unsuitable fuel. If the usual recommendations do not give much effect, you need to remove the spark plug and see if there are any oil spots.

The oil, especially the soot, should be carefully cleaned off. The spark plug must then be dried. The cylinder also needs to be dried out. As a “drying” is used a very simple method: repeated sharp pulling of the starter rope. Often the question arises: what to do if a single-axle tractor does not start, with black smoke.

Usually such a manifestation indicates that the engine is full of gasoline. You should also beware of damaging the piston group. If both of these suggestions are wrong, you need to call the service center. Further attempts to fix the problem on your own can lead to aggravation of the failure.

When the disturbance is due to a lack of fuel in the working chamber, the spark plug will appear dry.

Such a problem can be combated by:

  • Drain old fuel;
  • thoroughly wash the gasoline or diesel tank;
  • clean the air filter;
  • Clean out the fuel hose and nozzles with a compressed air jet;
  • Add fresh fuel;
  • After opening the fuel line, blow the channel located in the gas tank lid.

In some cases, the malfunction is due to gasoline entering the oil sump. Check if there is no such a problem, you must after any adjustment, adjustment of the carburetor.

If fuel clogging occurs on a regular basis, you need to look at the carburetor needle. It is likely that this is the weakest point. It is worth noting that sometimes still the motor of the motorblock shoots the muffler, and maybe even with a flame.

remove, piston, power, tiller

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