In detail: do-it-yourself repair of pld sections for Mercedes actros from a real master for the site my.housecope.com.
In diesel engines, injection systems have two main components: a high-pressure fuel pump, which regulates how fuel is supplied to each cylinder of the engine, and injectors, which atomize fuel. This process takes place under very high pressure (over 2000 atm), and the first thing that breaks down during operation is the nozzle atomizer.
In an injection system with pump injectors, the actuator is combined into one structural unit with a control element - an electromagnetic valve, and the failure of one entails the repair of the whole mechanism. When something stops working, repair is required using special equipment, under high pressure, while the process is regulated with millimeter precision. Not every service station is able to provide the repair of pump sections, so the owners have to contact certified diesel services.
On such cars as DAF, Mercedes, Renault with MACK engine, individual pumping sections are installed, where the pressure element (plunger pair) and the control element (valve) are separated from the nozzle (injection mechanism) by a high pressure pipe. Now, if required, the nozzle can be easily removed, adjusted and repaired.
With this scheme of the fuel equipment, access to the pumping PLD section itself is facilitated, therefore, diagnosing a malfunction and carrying out repairs by selecting on the site all the necessary components for restoring the pumping section will now not cause much trouble. When removing or installing it, there is no need to adjust the thermal clearances. And the tube itself, which connects the two mechanisms, is in the public domain, therefore, if it is necessary to measure the pressure generated by the section, then the diagnostics is carried out directly on the car.
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By the way, the name of such pumps was given by the German abbreviation "Pump - Line - Duse", which means "pump - pipeline - nozzle".
As you can see, the main advantage of the system is that there is no need to change the design of the cylinder head during diagnostic and repair work, which immediately reduces the cost of repairs, which can be carried out in almost any fuel workshop. It should be added that the injectors need to be checked every 70 thousand km, the engine should not be overheated, and the fuel should be of good quality.
Diesel engines of SCANIA, VOLVO, IVECO trucks are equipped with pump nozzles, and PLD pump sections are used by MERCEDES Actros, Axor, Atego, RENAULT Magnum, DAF XF 95, XF 85.
PLD - sections are installed on such cars as DAF (DAF), Mercedes-Benz (Mercedes), Renault (Renault) with the Mack engine (MACK).
This scheme of the fuel equipment differs from the injection system with unit injectors. In the Pump-Nozzle, the control (solenoid valve) and the actuator (sprayer) are structurally integrated into a single whole. The PLD section is a control mechanism (solenoid valve). The control mechanism - an injector - is installed separately in the cylinder head and is connected to the PLD-section by a high-pressure pipe.
This injection system is highly maintainable. The fuel injector is separate from the PLD section. Because if the quality of diesel fuel is low, the nozzle atomizer is the first to fail. The injector can be removed and checked and, if necessary, adjusted or repaired.
PLD sections are mounted on the engine block. When removing / installing PLD-sections, adjustment of thermal gaps is not required.
The high pressure pipe connecting the PLD section and the nozzle is freely accessible. Those. if necessary, you can carry out a diagnostic procedure directly on the car with the least amount of labor - measure the pressure developed by the PLD-section.
Consider the device and the main malfunctions of the PLD sections.
The plunger is responsible for creating high pressure - about 1500 bar - in the injection system. The plunger has a yellow coating - titanium nitrite - which provides it with a long service life. The PLD body is a plunger sleeve.
1. Worn, seized and seized plunger and plug bushing. This is due to low-quality fuel, the presence of mechanical impurities and water in the fuel, low-quality engine oil and extended replacement times.
The red arrow in the figure indicates piston wear. This wear is caused by poor quality engine oil.
2. Shrinkage, destruction of the return spring.
3. Destruction of the retaining clip.
Consists of a PLD section body, magnet, spacer, bottom cover, plate and four bolts.
The most common malfunction is a violation of the tightness of rubber seals as a result of shrinkage and physical aging.
Very often there is such a malfunction as the separation of the valve from the plate. This is due to the destruction of the bolt connecting them. In this case, the PLD section stops working altogether.
The nozzle body is also a valve guide. When using low-quality fuel, the valve begins to wedge in the body. When the shut-off seat is worn, the valve-body injector does not deliver the required parameters. The obturator of the valve and body is marked with a red arrow in the figure below.
When disassembling-assembling the high-pressure tube, physical destruction of the thread and the sealing cone occurs. This leads to a breach of tightness and a decrease in the flow area of the hole.
The nozzle of the injection system with PLD-sections does not differ structurally from the nozzles of the injection systems with the high-pressure fuel pump. Diagnostics, troubleshooting are known, and repair of injectors can be performed in almost any fuel workshop.
Injectors on PLD-sections of DAF vehicles must be checked every 70,000 km. mileage. With poor quality of fuel atomization, the piston crown is destroyed with all the ensuing consequences. This is a design “feature” of DAF engines equipped with PLD fuel injection systems.
To ensure the resource of the PLD section and the reliability of its operation, it is necessary:
1. Refuel with quality fuel.
2. Strictly observe the frequency of engine oil change and adjust the thermal clearances of the valves.
3. Do not overheat the engine.
And then PLD-sections in gratitude for such "care" will provide you with reliable work for many years.
The list of services of our company includes diagnostics and repair of individual sections of such trucks as Mercedes Actros (Axor, Atego), Renault Magnum, DAF XF, MAZ 256.
The diesel engine of such a truck is equipped with individual pumping PLD-sections.
On such cars as DAF, Mercedes, Renault with MACK engine, individual pumping sections are installed, where the pressure element (plunger pair) and the control element (valve) are separated from the nozzle (injection mechanism) by a high pressure pipe. Now, if required, the nozzle can be easily removed, adjusted and repaired.
With this scheme of the fuel equipment, access to the pumping PLD section itself is facilitated, therefore, to diagnose the malfunction and carry out repairs. When removing or installing it, there is no need to adjust the thermal clearances. And the tube itself, which connects the two mechanisms, is in the public domain, therefore, if it is necessary to measure the pressure generated by the section, then the diagnostics is carried out directly on the car.
By the way, the name of such pumps was given by the German abbreviation "Pump - Line - Duse", which means "pump - pipeline - nozzle".
As you can see, the main advantage of the system is that there is no need to change the design of the cylinder head during diagnostic and repair work, which immediately reduces the cost of repair. It should be added that the injectors need to be checked every 70 thousand km, the engine should not be overheated, and the fuel should be of good quality.
The individual sections are a diesel injection system in which the injection element (plunger pair) and the control element (solenoid valve) are separated from the injection element (injector) by a high pressure pipe.
This design plus installation separately from the cylinder head offers the following benefits:
- lack of mechanical devices such as additional rocker arms to drive the PDL-section;
- no need to change the design of the cylinder head;
- easy maintenance of PLD-sections due to easy access to them.
Repair of individual sections is:
1. Restoration of the efficiency of the fuel system under different operating conditions of the diesel engine.
2. Provision of a metered supply of fuel under pressure.
3. Repair of components of the injection system of a diesel engine.
4. Compliance of the fuel injection parameters with the operating conditions of the diesel engine.
Consider the device and the main malfunctions of the PLD sections.
The plunger is responsible for creating high pressure - about 1500 bar - in the injection system. The plunger has a yellow coating - titanium nitrite - which provides it with a long service life. The PLD body is a plunger sleeve.
1. Worn, seized and seized plunger and plug bushing. This is due to low-quality fuel, the presence of mechanical impurities and water in the fuel, low-quality engine oil and extended replacement times.
The red arrow in the figure indicates piston wear. This wear is caused by poor quality engine oil.
2. Shrinkage, destruction of the return spring.
3. Destruction of the retaining clip.
Consists of a PLD section body, magnet, spacer, bottom cover, plate and four bolts.
The most common malfunction is a violation of the tightness of rubber seals as a result of shrinkage and physical aging.
Very often there is such a malfunction as the separation of the valve from the plate. This is due to the destruction of the bolt connecting them. In this case, the PLD section stops working altogether.
The nozzle body is also a valve guide. When using low-quality fuel, the valve begins to wedge in the body. When the shut-off seat is worn, the valve-body injector does not deliver the required parameters. The obturator of the valve and body is marked with a red arrow in the figure below.
When disassembling-assembling the high-pressure tube, physical destruction of the thread and the sealing cone occurs. This leads to a breach of tightness and a decrease in the flow area of the hole.
The nozzle of the injection system with PLD-sections does not differ structurally from the nozzles of the injection systems with the high-pressure fuel pump.
With poor quality of fuel atomization, the piston crown is destroyed with all the ensuing consequences. This is a design "feature" of engines equipped with a PLD-section fuel injection system.
To ensure the resource of the PLD section and the reliability of its operation, it is necessary:
1. Refuel with quality fuel.
2. Strictly observe the frequency of engine oil change and adjust the thermal clearances of the valves.
3. Do not overheat the engine.
And then PLD-sections in gratitude for such "care" will provide you with reliable work for many years.
Sometimes the car owner needs to find out the model and engine number by the Vin-code. This may be necessary for the selection and purchase of spare parts and components, checking the car before buying, determining the configuration and method of operation.
This article shows the algorithm for working with the CR-1 flow control unit when diagnosing injectors and high-pressure fuel pumps.
Please tell me, under the PLD section there is a slight drip of diesel fuel, how to eliminate the leak and the principle of removing the section itself.
And the second question is off-topic, does not show the temperature of the coolant, the sensor on the engine is working properly, is it connected via a fuse or is it looking for a break in the wiring itself?
unscrew the power wires, the high pressure pipe and the bolts securing the PLD-section to the block, remove the section.
Replacing the outer O-rings (key 8) is usually sufficient.
Pos. eight Mercedes nr. A 028 997 56 48 , BOSCH NR. F 00H N37 454 - repair kit
Pos. eleven Mercedes nr. A 023 997 68 48 , BOSCH NR. F 00H N35 985 (9X14X2.5) FPM, ELRING NR. 447.020 , GOETZE NR. 50-350225-00 - ring
Pos. 12 Mercedes nr. A 012 074 01 01 , BOSCH NR. F 00H N37 070 - repair kit
Good day to all kind people. The article will tell you what are PLD pump sections... Our readers asked to write in detail about PLD-sections, their design features and the principle of operation.
They are used on diesel engines and serve to supply fuel to the combustion chamber. Not as widespread as unit injectors, but nevertheless they are used by many well-known car manufacturers.
The PLD pump section is structurally different from the traditional pump nozzles. Fuel injection occurs as a result of the operation of the plunger pair. The control elements are solenoid valves of a special design.
Connects the plunger pair and the solenoid valves to each other with a high pressure pipeline. Differs in high strength and reliability of the structure. It is a kind of "bridge" between the pumping and control elements.
The abbreviation PLD in German stands for "pump-line-duse". If you translate, you get "pump-pipeline-nozzle". The principle of operation of the mechanism becomes clear from just one name. Fuel supply - fuel delivery - atomization into the combustion chamber.
Pump sections PLD are used by a number of manufacturers: Renault, Mercedes, DAF, Volvo and others. Fuel delivery systems of this type are used in commercial vehicles.
PLD pumping sections have their own advantages and disadvantages. Particular attention must be paid to the quality of the fuel.
The fuel system of the PLD section has a number of undeniable advantages. Many well-known truck manufacturers have been using PLD sections for a long time.
- Quick dismantling and installation of the mechanism.
- Successful design.
- Simple maintenance.
- Simplified system replacement procedure.
- The efficiency (efficiency) of a diesel engine increases by 30-40%.
- Reduced fuel consumption.
- The maximum level of combustion and the use of diesel fuel.
- Decrease in emissions of harmful substances.
- Increased service life of the power plant.
- Reliability and durability of the structure.
The structure is simple and easy to dismantle if necessary. All the main elements of the system are clearly visible and the slightest fuel leaks can be noticed quickly.
Even the most efficient and reliable fuel delivery system requires timely maintenance and repairs.
It is necessary to establish the reasons that led to the breakdown and the need for repair operations. Diagnostics will help reduce the risk of re-failure in the future.
It is impossible to independently repair and restore the pumping sections of the PLD, because the use of special tools and equipment is required.
For example, you can refer to the website of the SPBParts company, which repairs and refurbishes the pumping sections of the PLD.
We follow the link to the site, where we see that the cost of repair and restoration of pumping sections starts from 5500 rubles.
Experts will carry out all the necessary diagnostic procedures and check the operation of the system using a special stand.
When the first signs of a malfunction appear, there is no need to delay contacting the service. Delaying repairs will result in large material costs.
Most of the breakdowns in PLD systems are caused by the use of low quality diesel fuel. The high content of impurities leads to accelerated wear of the main elements of the fuel supply system.
- Dismantling.
- Diagnostics.
- Disassembly.
- Cleaning.
- Troubleshooting.
- Repair and restoration.
- Adjustment of the main mechanisms.
- Assembly.
- Testing at the stand.
- Correction of work.
- Installation on the engine.
When using low quality diesel fuel, the nozzle body wears out the most. High pressure and temperature fluctuations reduce the efficiency of the work.
Perhaps the appearance of microscopic cracks. Fuel with impurities changes the shape of the nozzle orifice.
Repair sprayers are easy to remove and install. It is not difficult to dismantle the entire PLD section, because it is located on the power plant block.If desired, you can perform diagnostic operations directly on the machine.
In the valve section of the mechanism, the rubber seals may wear out. You can solve the problem by replacing. Valve seizure is often seen as a result of prolonged use of low quality diesel fuel.
- Use of high quality diesel fuel.
- Timely diagnostics and service.
- Use of original spare parts.
- Timely oil change.
- Correct valve adjustment.
- Do not overheat the motor.
- Professional repair and restoration.
- Use of seasonal fuel.
Message andruscha74 »26 Sep 2017, 13:38
Message alecksandr. 74 »26 Sep 2017, 19:05
Message toxa101717 »26 Sep 2017, 21:53
Message Vit 71 »26 Sep 2017, 22:09
Message andruscha74 »26 Sep 2017, 22:27
Message Vit 71 »26 Sep 2017, 22:39
Message Samon »28 Sep 2017, 00:16
The guys need help, the actor in 1840 in 1998 and stalled, I can't start. There is a non-return valve holding the pressure in the rail, there is a new low pressure pump. I twist it with a starter, it grabs, but it feels like it grabs two boilers, but does not start. I unscrew the tubes from air bubbled in nozzles. unscrewed all the tubes, blocked the return line, pumped it with a pear, pumped up the pressure with a pump, started up just barely, but builds like a paralysis, added a little gas at once, I opened the return line of the salar with a fountain and with air. I think on the section of the FDI, really all went to bed at once. maybe I'm wrong. there is no way to make diagnostics, I’m standing on the track in the forest. there are no errors.
Sent after 2 hours 15 minutes:
I forgot to tell you! I don’t understand smoke or steam coming from the return line. Maybe just a couple of injectors stuck? Help me to understand.
These sections are actively used on trucks. Provide optimal fuel injection during engine operation, guaranteeing the rated fuel consumption and smooth operation of the unit. The main feature of the system is its maintainability through cleaning, prevention and replacement of individual elements.
These sections are actively used on trucks.
The nozzle is installed separately from the section itself, therefore, with low-quality fuel, the first element that fails is the sprayer. The nozzle must be removed, checked, repaired and adjusted if necessary.
Checking the fuel system is carried out using a special stand, which will show the most accurate data and allow for repairs. On the site, everyone can order repair services to ensure smooth engine operation and get rid of problems with the fuel system.
For diagnostics, special equipment is used. The main advantages of using stands and other equipment in the process of diagnostics and repair are as follows:
The last indicator is the time for the reaction of the electromechanical part when the fuel is dosed. The signal must be valid for normal operation. Inconsistency of indicators will lead to incorrect injection.
The last indicator is the time for the reaction of the electromechanical part when the fuel is dosed.
Testing at the stand is automatic. Pre-wash, stand installation, actual diagnostics and analysis of the results will take 30 minutes. The audit history will be saved and provided to clients after the audit.
After repairs, it is important to keep the fuel system in good condition and to guarantee optimal conditions for engine operation. For this reason, you should refuel with high-quality fuel, constantly replace consumables, including oil and filters, and from time to time carry out diagnostics of the fuel system.
Also, the engine must not be overheated, which will negatively affect the overall quality of its operation. After that, PLD-sections will provide long-term and reliable operation in the conditions of Russia. It is advisable to check it every 70,000 km, but this figure will be individual for each engine and manufacturer. Much also depends on the operating conditions.
