Replacement of the nozzle on a power tiller. Causes of malfunctions

Ignition device on Agro power tillers

Periodically it is necessary to repair the ignition of the motoblock due to improper operation or wear of the main parts of the node. The fault must be repaired as quickly as possible to prevent wear and tear on other parts and systems.

How to set the ignition on a power tiller?

Adjustment of ignition may be necessary if you have to repeatedly yank the starter rope or the engine does not start immediately, but with a delay.

It is necessary to perform the following actions:

  • Angle is put on the spark plug. The housing is securely pressed against the cylinder head, the element is turned to the other side of the hole on the cylinder head;
  • The crankshaft is turning. You need to pull the starter rope a couple of times. When pulling the cable, there should be a noticeable blue spark that pops between the electrodes;
  • If there is no spark check the clearance from the flywheel magnetic shoe to the starter. Optimal distance of 0.1 millimeters.

So, it does not take more than half an hour to install the ignition. If you do these simple manipulations correctly and in time, you can prevent the wear and tear of other parts and systems on your power tiller under high loads.

What to do if there is no spark on the power tiller?

The spark plugs are the most common cause of ignition system malfunctions. Often the spark plug becomes oversaturated from an overabundance of engine oil. If it gets on the part, it prevents the spark from forming.

When there is no spark, you need to act as follows:

  • The spark plug is unscrewed with a special wrench. The element is turned and carefully removed, also the o-ring should be unscrewed;
  • If the spark plug is dry, this indicates that the fuel is not supplied to the cylinder of the motor;
  • If the spark plug is too wet, it is an indication of excessive engine oil. The spark plug is wiped, the cylinder is dried. To this end, the starter cable is tightened;
  • If there is a hard sludge on the spark plugs you can use petrol and coarse sandpaper to clean it.

Such manipulation can be performed on a diesel motoblock and on gasoline models. It is important to perform all actions as carefully as possible without damaging the part.

Magneto for a motorblock

Magneto on a single-axle tractor is similar in principle to the ignition coil. responsible for the appearance of the spark.

You can check the magneto of the motor-block as follows:

  • Remove the cap from the top of the spark plug and insert a nail. All manipulation should be done as carefully as possible, so that after rechecking the candle can be reassembled in place;
  • The nail is placed seven millimeters from the machine’s cylinder;
  • The candle is returned to its standard position and start the engine of the motoblock;
  • An electric spark must be produced during the start. It will be strong, with a blue tint. If the spark is different, it is an indication that the problem is still there.

It is important to follow the following rules when checking the magnetos:

  • the spark plug is not fully unscrewed. This can provoke a loss of compression, the flywheel will rotate much faster;
  • this method is ineffective if an electronic ignition system is installed. Problems can also arise with the key components of the system;
  • The distance between the nail in the spark plug cap and the cylinder is different, and depends on the specific design of the machine.

How to check the ignition coil on a power tiller?

The ignition coil of the motorblock contributes to the appearance of the spark that ignites the fuel. The diagrammatic illustration shows the principle of ignition. ignition may be non-contact (first photo) or contact (second photo) depending on the principle of operation.

Initially, the coil is inspected. It may have cracks, dents and other mechanical damage. If the coil structure is intact, you need to look for another cause of malfunction.

The following problems can occur:

  • measuring the resistance data of the coil. In this case, you need to have an idea of the key parameters at which this resistance occurs;
  • The device is used to determine the spark. The cost of such a device is quite high;
  • spark plug is used. It is unscrewed and applied to the cylinder. Next, yank the starter rope and watch for a spark.

It is worth using the listed methods, if it is impossible to ask for qualified help. During operation, it is important to make sure that no electric shock occurs.

To perform the repair is quite possible with your own hands, following simple tips. To facilitate the work, you can view a video tutorial.

For power tillers of such brands as Neva, Ural, Agro, Zubr, Salyut, Mole, Kaskad, MTZ and Honda, the actions for tuning are completely identical.

Fault diagnosis

Despite the undeniable advantages over the carburettor systems, the injector engines are quite capricious, exposed to the influence of many factors and have higher demands for maintenance.

Engine operation depends on the state of injectors. The main external signs of problems with injectors are:

  • jerking and sagging when accelerating the car;
  • Engine rpm is too low;
  • Unstable operation at idle and low rpm;
  • High level of toxic substances in the exhaust.

Check with stethoscope

You can do the diagnostics yourself or go to a car service. The procedure for checking the injectors with your own hands is as follows.

  • Check the valve. If it is stationary, either the injector itself or the electrical circuit is faulty.
  • If you hear a characteristic noise when the valve opens, it is functioning properly. If there is no sound, the valve is not working.

When diagnosing injectors you can use stethoscope.

  • Use a stethoscope to listen for clicking nozzles at idle speed. Listen so that clicks are not transmitted through the fuel rail to the inoperative injector from the working injector.
  • Check that the frequency of clicks increases as the engine crankshaft speed increases. If not the injector is faulty.

Check with a multimeter

Multimeter is a special device for diagnostics of electric circuits.

  • In the technical documentation find the value of resistance of injectors installed on your car.
  • Disconnect wires from the injectors.
  • Set your multimeter to the resistance measurement mode.
  • Connect multimeter pins to the injectors.
  • Measure the resistance of injectors.
See also  Which gearbox is better for a power tiller

Normal impedance of injectors with low resistance should be 2-5 ohms, with high. then 12-17 ohms. If the values do not match, the injector is replaced with a new one.

Checking on a test stand

The test bench may have different design, can be expensive or cheap. Simple stands can be found in private garages. They are used to check injector pressure. Professional benches allow you to accurately diagnose and adjust injectors. Such equipment is usually available only in service centers.

Professional bench

Professional stand for injector testing

As the simplest test bench to check the injectors can be used mechanical tester MTA-2. nozzles, injector pressure, fuel injection pump and air pressure are easy to check. No need to disassemble the engine.

expensive and sophisticated is the stand “Bosch”. Many experts regard it as the benchmark for high-pressure injection molding machines. The Delphi, Hartridge, Rabotti and other test benches also show good results.

Causes of common rail diesel engine opacity. | Topic Author: Kristalyn

Causes of smoke in the common rail system.A great many articles have already been written about the smokiness of diesel engines, so we would like to focus on the smokiness of common rail turbo diesel engines.

The saturated black smoke is the result of incomplete combustion. There could be several causes, wrong injection timing. which is almost impossible for common rail, wrong injection quantity, wrong injection pressure, wrong atomization conditions, wrong combustion conditions, lack of air.Blue and gray smoke of unburned fuel can be caused by insufficient compression, low pressure in the fuel line or heavy wear of the injector nozzles.white smoke (steam). ingress of coolant into the combustion chamber.Let’s consider these causes in detail.

Incorrect injection timing in the common rail system is almost impossible since the injection timing is controlled by the system control unit and the data are taken from the crankshaft and camshaft position sensors, but in some vehicles, an error is possible.

For example, we had a Hyundai Starex that had camshafts that were 90 degrees ahead of the crankshaft, but the system still worked. Such malfunction can cause a wide variety of smoke and other symptoms, but the first symptom is obviously not the correct operation sounds, a sharp decline in power and problems with starting.

Incorrect amount of fuel injected can be caused by mechanical or electronic malfunction of injectors, injection pressure regulator, fuel pressure sensor or ECU (Electronic Control Unit) of the engine. Nozzles can “leak” because of wear or mechanical damages of atomizer and/or valve. This defect is accompanied by a knocking noise during engine operation, especially often you hear such a knocking noise at full throttle. If this is the case we recommend to contact our experts in common rail and injectors diagnostics and repair

Faulty pressure regulator can keep too high pressure in the fuel line, and as a result too much fuel is injected, as well as the cause of high pressure can be a faulty pressure sensor. Malfunction associated with high pressure can be easily identified by a characteristic harsh “early” sound of the engine and the black smoke from the exhaust.

Improper spraying conditions may be caused by improper positioning of the atomizer in the combustion chamber, for example if the injector is installed on an improperly thick sealing washer, or 2 washers. Because of this, the nozzle does not spray fuel into the combustion chamber, and in the well of the atomizer, and the correct atomization does not turn out. In such conditions there may be abundant black smoke and knocking.

Incorrect combustion conditions. insufficient compression of the fuel-air mixture. low compression, too much compression, lack of air. With low compression the engine is difficult to start, power loss, possible smoke, at cold. blue (unburned fuel), and under load. black.

With excessive compression the engine is noisy with knocking, hot starting is difficult (cannot turn on starter), such defect happens very rarely and is usually caused by an error during engine assembly.

If there is a lack of air, for example if the turbine is defective (turbine control) or the inlet line is not tight, there is black smoke under load and the engine also loses power significantly.

Also the fumes could be related to poor quality fuel, there have been cases of fuel not burning in a cold engine or the car being fueled with gasoline instead of diesel. Here you can advise to fill only at a certified gas station and always keep the receipts.

(Najia) Without using special equipment, you can determine and repair only malfunctions associated with the lack of air or improper installation of nozzles. If the turbocharger “blows” and no one has touched the injectors. installed correctly, contact a workshop specializing in diagnosis and repair of common rail systems.

This article was posted on the site of one of the diesel workshops in St. Petersburg, only because I wrote it for that site when I worked there.

Vladislav (Kekoa) Hi! and we’re smoking like this! We tried to change the gauges and nothing, it’s the injectors?

Nikolay (Adalie) I have the same problem: at idle goes black smoke, does not chew oil, starts well, even in frost.20, compression28kg, if you can tell me how to deal with this trouble. I’d be grateful.

The engine won’t start: what to do??

If the engine does not manage to start at all, the repair of the motoblock with his own hands is complicated, you will have to put it off for a while and check

  • In what position is the motor (if the central axis is tilted, it is desirable to set it in its former place to avoid serious trouble);
  • Whether the fuel comes to the carburetor in sufficient quantity;
  • how clogged the tank cap is;
  • fuel supply system;
  • whether the spark plugs and the fuel tank tap are dirty.

Peculiarities of repair of a motobloc carburetor

To restore the functionality of carburetors, it is necessary to perform a competent cleaning of clogs. So, before proceeding to the removal of dirt, you should disassemble the unit and clean it, observing the basic recommendations of the manufacturer, and then re-adjust. The sequence of steps is spelled out in the instruction manual and repair manual for power tillers.

The whole algorithm of actions boils down to restoring the uniformity of its immersion by eliminating the deformation of the bracket, by which it is attached to the engine cylinder. The adjustment process can be carried out both with closed and open needle valve. In both cases, the removal of the deformation is carried out by hand with a screwdriver.

Along with diagnosing the condition of the carburetor, it is also desirable to pay attention to the condition of the valves located on the power tiller. The procedure consists in checking the tightness of a single valve, which is important in restoring the optimal gap. Their adjustment helps to restore all the functions of the power tiller.

Fixing the nozzles of diesel engines: Repair declassified. Auto

High cost of new components of the power system of diesels in Ukraine can nullify all the advantages of passenger cars with this type of engines. But injectors, in most cases, are repairable.

See also  Motoblocs improvement with their own hands. Rake for power tiller
High cost of new components of diesel engines in Ukraine can reduce to zero all advantages of passenger cars with this type of engines. But in most cases, the injectors can be repaired.

Usually, the manufacturers of automobile diesel engines recommend replacing the injectors after each 100-150 thousand meters. km of run. But not always in such “age”, this component of power system is already unsuitable for further operation. Often the injector is able to work for 30-50 thousand kilometers longer than the manufacturer’s deadline.

But in this case, no one can guarantee the quality of the fuel atomization. Therefore, some time later, a traffic police inspector becomes a “diagnostician”, and imposes a fine for excessive smokiness of exhaust. For some car owners, the visits to service stations become the “last bell” before the inevitable repair.

“A watering can is a watering can,” say motorists in such cases, referring to the injector uncontrollably pouring fuel into the cylinder.

Available to all

The reasons for malfunctions of injectors may become wear and tear, clogging, corrosion caused by unseparated water and high sulfur content in the fuel.

Until recently, some reputable manufacturers of fuel equipment (eg, Bosch) kept the topic of repairing injectors closed. Instead, they collected worn injectors from all over the world and restored them industrially.

Their quality was high, but they were much more expensive than existing aftermarket kits. although not original, they were almost as good.

Since motorists still preferred repairs using these kits, Bosch eventually “declassified” all data on injector repairs and injector parts and established a corresponding branded service.

Trouble Shooting

To check the condition of the injection devices and determine the cause of malfunction, diagnostic equipment available to diesel professionals. Before beginning the test, the injector should be cleaned (preferably in an ultrasonic bath) and checked for mechanical damage. For example, the edges of the atomizer hole must be sharp.

The basic test tester is a hand plunger pump with a connecting fitting and a manometer that measures injection pressure. Sometimes special oil is used instead of diesel fuel.

On this stand the needle mobility in the atomizer is checked. a sharp rattling sound during atomization testifies that everything is all right.

It happens, however, that a low-quality nozzle does not rattle, but this is not always a sign of its unsuitability.

Then check the shape of the flare or flares of the atomized fuel. At 20 bar less than the needle opening pressure, check that the injector and nozzle seals are still tight. At the same time on the nozzle no more than one drop of fluid is allowed to appear within 10 seconds, and the drop should not fall.

With the help of this device determine the pressure of the injector opening. Deviation from the norm and the scatter of readings for all injectors of the same engine manufacturers stipulate individually.

It is more difficult to check this parameter at double-spring injectors. and today about one third of diesel engines, which are exploited in Ukraine, are equipped with such injectors.

Before the injection of the main dose of fuel at a pressure of 150. 250 kg/cm2 needle should rise by 0.03. 0.05 mm, letting the pre portion of fuel (pressure of 110. 170 kg/cm2). Only the most advanced electronic test-benches can “see” the moment of opening of the second stage (they already exist in Ukraine).

It is even more difficult to determine the amount of fuel supplied to a cylinder from the atomizer of double-spring injectors. For example, the pre-injection portion is only 1.5 mm3. As far as we know, in Ukraine there are no devices for such measurements.

What to change and what to repair

Often it is only necessary to clean the nozzle if it has gone out of order and it works properly again. A particle caught with fuel in the atomizer often leads to jamming of the needle or change of the shape of the injected fuel torch.

It is good if the consequences will be limited by only reduced efficiency and power, which not every driver will notice right away. The repair mechanics know the cases when the “wrong” fuel jet from the contaminated nozzle literally burned through the piston.

Timely detected clogged nozzles are cleaned in disassembled condition: manually with scrapers and brushes or on a stand with ultrasonic and special fluid.

In the majority of cases all problems in case of breakdown of hydro mechanical nozzle (the new one costs 90. 200 euros) are solved by replacement of a set. sprayer with a needle (the price. 35. 50 euros).

In order to finally verify that the cause of the malfunction is in the sprayer, the suspected part is mounted in a special test body.

If the parameters of flare “limp”. it is fault of tested injector, otherwise look for other reasons of incorrect operation.

The intermediate washer between spring and atomizer is also subject to wear. Circumferential wear and tear on it provokes misalignment and untimely actuation, lifting of the needle to an insufficient height. This can be ordered separately from a catalog (price €6. 12).

A big rarity is the breakage of the spring (4. 7 euros), although over time it can lose stiffness and sag. In this case, its force is restored by adding adjustment washers.

In the high mileage engines, there are nozzle body defects caused by corrosion or mechanical wear (complete nozzle without a nozzle costs 55. 73 euros). It may happen that a fitting breaks off due to careless installation.

Of course, in this case, the part or the entire assembly should be replaced.

Problems of complex constructions

Nozzles with electric needle lift sensors can cause additional problems. For example, these were installed on Mercedes and VW diesel engines of previous generations. These injectors cost from 250 to 400 euros per piece, and their repair kit includes only the mechanical part.

Repair and causes of diesel injectors failure

The main difference between diesel engines and gasoline engines is that they use a special mechanics of fuel injection. And in diesel engines, the fuel is fed to the combustion chamber by injectors.

Due to this device the fuel with high temperature and pressure is metered. As a result of which the diesel fuel is ignited. And, respectively, diesel injectors have a very high load, because this mechanism has to constantly work in an aggressive environment.

And accordingly any negative factors can lead to rapid wear and tear and failure of injectors.

And after that you may need to repair nozzles, with what no problem professionals from the site remontforsunok can Below we will look at a number of specific malfunctions that can occur in injectors.

The main causes of malfunction

The need for repair of diesel injectors may arise in the following cases:

  • Poor quality of diesel fuel. As a result, the injectors begin to clog, which leads to a violation of the dosage in the process of feeding fuel into the combustion chamber;
  • If there is a factory defect in the injectors;
  • As a result of mechanical damage.

In most cases, the above factors can lead to the following failures: changes in the angle of atomization of fuel, the dosage of fuel supplied, breach of tightness of the housing.

See also  What trailer for the power tiller is better?

Signs by which you can determine the malfunction of injectors

There are a number of signs that can be used to determine if the injectors are working properly:

  • Driving in low gears and at low engine speeds causes jerks and shocks;
  • Unstable work of the engine at idle speed or the engine even stops;
  • When the engine is running, large amounts of exhaust gases are released, which are characterized by very dark smoke;
  • Decrease in engine thrust;
  • If certain cylinders stop working.

Atomizer repair

Repair and maintenance of injectors in diesel engines should only be entrusted to professionals. They will be able to properly adjust this part and, if necessary, carry out restoration work.

For this purpose specialists use high-precision stands.

Of course, certain work on maintenance and repair of injectors can be carried out in garage conditions, but in this case no one can guarantee that you will not be able to further aggravate the situation.


Running in of a new power tiller.

To reduce the risk of injury, it is recommended to work in second gear.

Change the ground speed by changing the transmission ratio of the V-belt drive by shifting the pulleys on the engine gearbox and the gearbox of the power tiller (See “Adjusting the ground speed” on page 25). Section 7.4). After changing the ratio of the V-belt transmission, adjust it (See. See Section 7.3).

Start the motor. Engage second gear. Switch on the transmission with the clutch lever in the “engaged” position. Slowly move the clutch lever from the “Off” position to the “On” position causing the rotors mounted on the gearbox output shaft of the power tiller to rotate.

The working depth (up to 25 cm) depends on the coulter position: The deeper the coulter goes into the soil, the deeper is the working depth. Set the desired coulter position after selecting the desired working depth. Work a small area of soil, check the depth of the rotating blades and set the coulter in the desired position. If desired depth is not achieved, remove one pair of rotors.

The desired width of the ground to be worked is adjusted by installing two, four, or six rotors.

If the tractor engine speeds up while the tillage depth is decreasing, push down on the handle grips and lower the coulter.

If the single-axle tractor does not move forward and the rotors sink in, gently lift the tractor by the handle grips and move it out of this position.

If the single-axle tractor turns to the side of the tilled area, part of the rotor is walking on the tilled soil. Reverse the tractor with the single axle tractor.

When cultivating loose soil make sure that the rotors do not go completely into the soil, thus overloading the engine.

On heavy soils, virgin and undulating soils operate in several passes, each time increasing the working depth by changing the position of the sowing coulter. This provides a good crumbling of the clods and a more even soil structure. Tillage of above mentioned soils should be conducted with minimum rotational speed of cultivator blades (in 1st gear).

To avoid trampling on the ground turn the handlebars as far back as necessary and stay close to the side of the machine.

To avoid trampling on the cut surface, the handlebars can be turned as much as you like to allow the operator to stand behind or to the side of the tiller. Keep the tillage machine level at all times.

When working on a slope, special care must be taken when changing direction. Do not drive diagonally or across the surface of a slope. Do not drive the machine on a slope with a slope greater than 15°.

  • Move the clutch lever to the “off” position;
  • Move the throttle control lever to the “Stop” position;
  • Shift gearbox in neutral;
  • Switch off the ignition by pressing the stop button;
  • Close fuel tap.
  • Carry out all necessary maintenance on your power tool (Chapter 8).

Working with additional attachments on your power tiller.

Before operating an active implement (mower, snow blower, etc.) read the Operator’s Manual of the trailed implement carefully. Read the Operator’s Manual of the trailed implement and prepare it for operation according to the manual of the trailed implement. Attach implements to the power tiller.

For operating with an active implement (mower, snowplow, etc.).) is necessary:

  • loosen the boom mount with the crank 2 ;
  • turn the handlebar with control elements by 180°;
  • tighten the boom mount with the handlebar 2

The power take-off shaft with a single-arm pulley mounted on it is attached to the gearbox of the power tiller to drive the attachment. The machine is driven by an additional V-belt supplied with the machine.

Use the trailing tines for plow, tip-up, power shovel, and snowplow.

Adjusting the V-belt drive.

Adjust the V-belt drive by moving the motor relative to the crab. To do this, remove the protective shield and loosen the nuts securing the motor to the frame and the bridge between the motor gearbox and the steering column.

Position motor so that when clutch is engaged, belt shaft will deflect 30 to 40 mm with finger pressure at equal distance between pulleys.

When the clutch is engaged, the belt should not touch the upper and lower limiters. The clearance between belt and bottom stopper. within 7 to 15 mm

Adjust the clutch cable tension using the adjusting screw. Loosen the lock nut on the clutch lever housing.

Clutch cable tension should be minimal, but should not cause slippage of the V-belt. Criteria of failure and limiting condition of belts should be considered as breakage, cracks in depth to the bearing layer, stratification by more than 1/3 of length and impossibility to compensate belt lengthening in the drive of power tiller.

ATTENTION! Check that the ends of the belt pulleys are in the same plane when the motor is mounted. Max. deviation 2,5 mm.

Speed adjustment.

You can increase the number of speeds with the double-strand pulley. To do this, remove the cowl 1 and drive belt 1 from output “A”. Loosen pulley bolts 2 and 3, remove them, turn both pulleys by 180° and reinstall them in their previous places and fasten them with bolts. Put the drive belt on steering wheel “B”.

belt B(B) 850. IV; 2. driven pulley; 3. driven pulley; 4. oil filler hole in engine gearbox.

Adjusting the handlebar position on the power tiller.

Adjust the handlebar height as follows:

To turn the steering wheel it is necessary to loosen the fastening of the lever 2. Turn the handlebar to the desired angle and tighten the handlebar.

Related Posts

| Denial of responsibility | Contacts |RSS