Removing the turbine Megan 2 1.5 diesel. Renault turbine repair - advice from professionals

The reason for the failure of the turbine of cars of the brand can be wear of the working shaft of this device and deformation of the compressor wheel, as well as damage to the central housing. In this case, the increased play of the central shaft can be clearly noticeable, in which its wheels knock on the inside of the body. In this case, it is necessary to replace or repair this device.

The first signs of failure or incorrect operation of the turbine may be the formation of oil stains on the left side of the device.

This fact confirms that, due to a set of malfunctions, oil began to get into the intake manifold. The operation of the car in this case is highly discouraged, and the consequences require more extensive repairs.

The procedure for dismantling turbochargers

Before removing the turbocharger from the engine of a Renault Scenic 2 car for its replacement or repair, it is necessary to place the vehicle on a flat horizontal surface and fix the position with the parking brake and supports for the rear wheels. Using a jack, raise the front wheels one by one and place supports to provide access to the lower part of the vehicle. A height of 10-20 cm will be sufficient. The described procedure for raising the front of the car is relevant if it is not possible to use the overpass or inspection pit. On average, the total work time for removing and installing a new turbine can take from 4 to 6 hours.

Further, according to the standard procedure, it is necessary to dismantle the front bumper of the car, having previously disconnected all the electrical terminals. The next step is to dismantle the intercooler. If it is possible and necessary for such a procedure, it is advisable to clean this part from dirt and scale, which will significantly increase the level of its functioning. The oil from the intercooler must be drained into a separate container, and all hoses and nozzles must be thoroughly rinsed using special means. It is also necessary to allow some time to dry all cleaned parts before reinstalling them. Usually, during work with the turbine, the inner surfaces of the parts have time to dry and are ready for filling with working fluids.

The following measures are related to the dismantling of the engine protection and other parts that prevent access to the turbine housing or its extraction. These include a decorative plastic shield under the windshield of the car, as well as wipers that need to be uninstalled. Then it is necessary to disconnect the catalyst mount to the power unit of the Scenic 2. The number of these mounts is 2, one of which is located on the left side of the car and can be accessed from its lower part, and the second is located on the right side, which can be reached in the engine compartment ... To ensure the convenience of further work, the hook should be dismantled, which secures the plastic cover of the power unit. Key # 8 is used for this operation.

The catalyst is unscrewed from the exhaust system by unscrewing the bolted connections using a No. 13 head and a ratchet wrench. In this case, we are talking about removing 2 bolts in the lower part of the car, and four nuts through the engine compartment, for which the same socket wrench No. 13 and an additional extension are used. As an additional accessory that will greatly facilitate the performance of the described work, you can use a special portable mirror. Freed from the nuts and bolts, the catalyst is removed from the seat through the bottom of the Renault Scenic 2. Please note that a certain amount of restraint and accuracy will be required at this stage, since removing the catalyst may seem difficult.

After the completed stages of work, access opens directly to the turbine of the car. First, you need to unscrew the oil lines from the turbine housing using the TORKS key. In this case, the direct oil line is disconnected through the engine compartment, and the return line from the bottom of the car. To do this, use a No. 10 head and a ratchet wrench. It is also necessary to disconnect the vacuum hose.

At the next stage of work, using a spanner wrench No. 13, it is necessary to unscrew the two nuts that directly hold the turbine itself. In this case, one of these nuts is unscrewed from the bottom of the car, and the second through the engine compartment using a special extension for the key. Next, you need to remove the turbocharger through the lower part of the car, slightly scrolling it around its axis. Then you need to remove the direct oil line from the seat and flush it together with the return one. Also allow a little time for the cleaning liquid to evaporate.

Assembly should be carried out in reverse order with the obligatory replacement of all gaskets and a visual check of the condition of the associated parts for possible repairs.

After assembly, special attention should be paid to pumping oil, for which it is necessary to deactivate the crankshaft sensor and turn the power unit with a starter several times.

Do not forget to reconnect the sensor, after which the car is ready for operation.

Turbocharger service

Repair of the turbocharger is carried out after complete dismantling of this device and provides for its complete disassembly. It is recommended to clean the body of the part with a sandblasting device. Complete disassembly of the turbocharger involves loosening all bolted connections.

In most cases, the repair consists of installing a new turbocharger shaft, compressor wheels, a complete set of working bushings and the central body of the device. The impellers of the wheels, which are fixed on the axle, cannot be repaired or restored in the event of their deformation. Repair and installation of new components of the turbocharger can be carried out independently with minimal repair skills.

Renault 2 and 3 is considered one of the most reliable car brands. rightfully refers to those cars that, with proper maintenance, can serve and be in excellent condition for several decades. Among car owners, both the gasoline version and the diesel are popular, as a more economical option, and in the Renault version it is reliable and functional, regardless of weather conditions. A diesel engine has its own engine features - a turbine. Let's walk through the turbine dismantling process and put together a simple step-by-step guide.

Gas turbocharging and its malfunctions

According to Renault's repair note, the diesel turbine installed at the plant can be operated with a mileage of 180-200 thousand km. After that, it is subject to planned replacement. Its malfunction can be indicated by many indirect signs. First of all, oil drops under the bumper or a thin ring of soot on the edge of the muffler, popping sounds under the hood when cornering, and others.

In many cases, a turbine malfunction can only be determined by computer diagnostics with the engine turned off. It should be done as early as possible, otherwise, you will have to deliver the car to the service with a tow truck. In addition, we note that a complete overhaul can be done - the turbocharger will be disassembled, defective, and the bearing scroll and cartridge will be replaced. It will cost significantly less for your diesel than a replacement. It is for this that the independent removal of the turbine from the diesel engine is often required.

Turbocharger dismantling instructions

When reinstalling, do not forget to change all gaskets: the diesel engine, the catalyst, the gaskets on the return pipe and the oil-resistant ring.

Also remember to pump the oil after installation. To do this, turn off the crankshaft sensor and rotate the starter 2-3 times. The sensor can be found on the gearbox near the engine when viewed from the passenger compartment. After bleeding, it is important to connect the sensor and check the vehicle's performance. The entire process of dismantling on Renault Megan of any version will take you 4-6 hours.

For Renault car owners, repairing a turbine can become a sudden nuisance if you do not adhere to the simple rules for operating cars with a turbo engine, which any Renault dealership employee will tell you about. Yes, in fact, these rules apply to any brand of car, in the models of which it is provided to be equipped with a turbocharger.

Remember and always follow the points below, and then you may be able to postpone the repair of the Renault turbine at a later date:

the diesel engine requires warming up before loading, so it is not worth it, as they say, "right off the bat", especially in winter;
if the manufacturer's recommendations have clear instructions on the brand of fuel (for gasoline engines) and oil, then it is better to listen and try to follow them;
no matter how costly the article on providing the car with oil may seem to you, do not try to delay the date of replacing fuel and lubricants, since any manufacturer calculates and tests a turbocharged engine and knows how long the oil will maintain its performance characteristics. Since the turbine, in contrast to the atmospheric engine, works as a whole with the engine, the oil is used as one. In addition, a turbine powered by exhaust gases is always in an overheated mode, especially a gasoline one, so the effect of high temperatures is also present. It is better to change the oil a little earlier than the planned date, especially if the recommended mileage from the last oil change is already approaching the "red line";
train yourself to perceive the machine as a full partner with its own principles and mode of operation. Listen to the "conversation" of the motor and immediately respond to all manifestations indicating deviations from normal operation;
if the slightest signs of a malfunction in the operation of the turbo engine appear, immediately go to the service center to diagnose and find out the causes of the breakdown that has appeared. Do not rely on "maybe", since in this case you can only face the problem of the need to replace the turbocharger after a while, and this is much more expensive than repairing the Renault turbine;
if you do not understand anything about the functionality of a car, because you do not have sufficient knowledge in this area, consult with specialists in the same car service;
remember that the more intensively the increased power of the car is used, the more often you will have to visit the service to change the oil, as well as the oil and air filter;
do not try to make a sterile cleanliness under the Renault hood, using sealants to seal the points of connections of pipes and hoses. It is strictly forbidden to use sealants by manufacturers in connection with a turbo engine!

Do not neglect the above recommendations. Not because someone decided to tell you how to proceed when operating Renault. By testing the engine on test benches and subjecting it to various loads, manufacturers are trying to find out the reasons for the decrease in engine performance and are looking for ways to reduce the likelihood of problems. It is better to prevent the "disease" than to subsequently look for the possibility of its treatment.

Do not rely on your own Renault turbine repair experience!

Let's say you have sufficient knowledge of the structure and operation of a turbo engine. Even in this case, there is a possibility of an erroneous "diagnosis" when a breakdown occurs, because you may not notice some symptom. It's another matter if a software complex is engaged in diagnostics - equipment, thanks to which it is determined how good one or another vehicle system is.

There may be several reasons for the breakdown that appears, so it is better to examine all the systems of the machine on a test bench. And it doesn't hurt to consult with a professional, unless, of course, you are an advanced car enthusiast, because the effectiveness of a collegial solution is always higher. If you do not have competent knowledge in establishing the causes of turbo engine breakdowns, do not know, as they say, "where the legs grow from" in the problem with the coloring of the exhaust gases or the noise that has appeared, contact the car service.

In any case, the service will be responsible for the consequences of repairing the Renault turbine. This is due to the fact that for any service or repair work in the conditions of a service station that has received a certification permit for any type of work on Renault models, you are issued a guarantee for the operations performed and the parts replaced.

The reasons why you can establish a deviation from the normal operation of the Renault turbo engine:

Exhaust is black, blue or gray at high engine speeds. The reason may lie in the violation of the tightness of the oil or air inlet and outlet pipes, clogging of the oil line.
The grinding and clanking that appears when the motor is running indicates several possible reasons:

the presence of a foreign body;
deformation of the body or movable parts of the engine, in which they friction against adjacent planes. This happens due to exposure to high temperatures or the ingress of a foreign body leading to a change in the configuration of the impellers, for example;
violation of the integrity of the body, oil hoses or air pipes.

Oil consumption has increased. A possible reason lies in a clogged oil line or a violation of the integrity of the oil hoses, which will also be evidenced by visual signs of a leak - oil stains can be found at the parking lot.
Fuel consumption has increased. This is most likely a problem with getting enough air into the cylinders to enrich the fuel mixture for efficient combustion. This may be due to the depressurization of the air pipes, as well as the presence of other reasons in the form of improper control of the variator, for example.
The car accelerates for a long time, that is, it loses the qualities that a turbo engine gives the car, the dynamics of the car's movement indicates a lack of traction.

Having responded to the malfunction in time means preventing the need to replace the Renault turbine.

Renault turbine repair sequence

In any service they know that the main reason for the appearance of deviations in the operation of a turbo engine is a decrease or increase in oil pressure, as well as the degree of its clogging. If the reason is in the oil and the owner immediately contacted the service, the repair will cost only by replacing the filter, flushing the oil line and changing the oil.

In other cases (in case of deformation of the rotor and compressor wheels, the appearance of a large backlash on the shaft axis, etc.), the Renault turbine needs to be repaired, and if the integrity of the supercharger housing is violated, its complete replacement.

Repairs are made in the following sequence:

Inspection of the turbo engine to detect visible deformations and violations of the integrity of the housing.
Dismantling the unit for disassembly.
Dismantling the turbocharger into its component parts and troubleshooting.
Cleaning in the sandblasting chamber of the hot snail, body and other external parts.
Washing of cold parts in an ultrasonic alkaline chamber with a certain operating mode.
Replacement of damaged or worn parts (rotor wheel, shaft and other parts).
On the balancing device, the rotor parts are debugged separately and the shaft is assembled.
The complete cartridge is balanced, that is, the rotor with the bearing housing.
The unit is assembled into the original functional structure.
The turbocharger is being debugged on test benches with the creation of conditions for maximum loads.
The repaired turbo engine is installed on the machine.
An opinion is issued on the performed repairs and replaced parts, as well as a guarantee.

The same sequence will be for self-repair of the turbine. There will not only be a guarantee for the work performed, since in this case you yourself are responsible for the actions performed. It is also worth considering that for a complete repair of the Renault turbine, specific equipment will be required, which will allow it to be installed after repair on a turbo engine with fully restored functionality.

Debugging, balancing and testing a turbine after repair will require professional equipment, skills and knowledge in the field of the device, the principle of operation and repair of the turbocharger. The best way out if a turbocharged engine malfunctions is to visit a service center.

The need to remove a turbine from a diesel engine can arise in two cases. When cleaning this unit or repairing or replacing it.

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Turbine malfunctions

The need to dismantle and repair the unit may arise in several cases:

When the power unit was operating, third-party sounds appeared. It can be whistling or grinding.
The volume of smoke coming out of the exhaust pipe has increased. The color of the exhaust gases may change to white or blue.
The power of the power unit has decreased. This is especially true when driving at high speeds.
The consumption of engine fluid has significantly increased or the pressure of the lubricant has decreased.

The cause of the problem usually lies in the structural elements of the turbocharger.

Diesel Agro Channel spoke about turbine malfunctions.

What do you need?

To remove the turbocharger from the engine with your own hands, you will need the following:

a set of ratchet sockets, in most cases 1/2 and 1/4 tools are required to complete the task;
it is advisable to prepare different extension cords and gimbals for dismantling;
a set of screwdrivers - with Phillips and flat tips;
wD-40 tool.

Turbine removal algorithm

If the machine is more than five years old, then a day before dismantling the unit, it is recommended to process its nuts and bolts with WD-40.

For the best effect, it is better to wrap all fastening elements that fix the turbocharger to the manifold with a rag soaked in WD-40 fluid. In the absence of this agent, kerosene can be used. This step will allow you to more quickly and conveniently dismantle the bolts and nuts.

The procedure for dismantling the turbocharger is as follows:

The on-board network in the car is turned off, all working electrical equipment and devices are turned off beforehand. To de-energize the mains, open the hood of the car and disconnect the negative terminal from the battery.
Get free access to the turbocharger unit. Often this assembly is located between two manifold assemblies - the outlet and the intake. Look for a turbocharger on the right side of the power unit if the vehicle is rear-wheel drive. If we are talking about front-wheel drive, then the unit is located on the left side of the engine.
When dismantling the turbocharger, one must be guided by the design features of the engine compartment. If a generator set interferes with the removal of the turbine, then it will have to be dismantled, having previously loosened and removed. We recommend that you immediately assess the condition of the strap - if the product is worn out, it must be replaced. The battery and the fluid reservoir of the windscreen and rear window washer system can interfere with the dismantling of the unit. These items must be removed.
Modern turbocharged units are equipped with controllers designed to ensure the correct operation of the components. We are talking about regulators of the health of compressor devices, gas temperature sensors, pressure levels and others. Before dismantling the unit, disconnect these devices from the machine's power supply by removing the connectors from them.
All lines of the cooling system are turned off, as well as the lubrication system of the cartridge of the turbo compressor unit. Disconnected pipes must be marked in advance. When disconnecting the pipe for draining the engine fluid from the cartridge, a container must be placed under the line in the crankcase of the power unit.
The turbocompressor device is being dismantled. It is fixed on the downpipe and appipe, and can be mounted on the engine block. The section of the line leading to the exhaust pipe is dismantled. Retain all sealing elements and nuts when removing.
The upper line is disconnected. Through this pipe, the air flow is supplied to the power unit. All bolts securing the pipe are unscrewed.
If there is an attachment to the engine block, it is disconnected. The turbocharger assembly is disconnected from the manifold assembly and removed.

The installation procedure is performed upside-down.

The presence of a turbine in a car provides an increase in engine power due to the entry of the same air flow into the cylinders with its preliminary compression. Before removing the turbine and replacing it, it is recommended that you familiarize yourself with the reasons for the failure of the unit.

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Turbine malfunctions and their symptoms

The service life of a turbocharger is on average about ten years. But despite this, if used improperly, the unit may fail much earlier.

Breakage signs

Symptoms by which you can determine the need to replace the turbine:

Vehicle traction has decreased. Power has dropped, the driver needs to press harder on the gas to set the required engine speed.
The appearance of black, white or blue smoke from the exhaust pipe. Blue smoke from the muffler indicates the combustion of engine fluid in the cylinders of the power unit, the oil gets there from the turbocharger. Black smoke indicates an air leak, which can indicate a leak in the system. White smoke indicates that the blower oil drain is clogged.
The appearance of grinding, uncharacteristic noise or whistling during the operation of the motor. The presence of a whistle indicates an air leak from the junction of the outlet of the compressor device and the engine. The screeching sound indicates friction between the components of the turbocharging system.
The consumption of engine fluid has increased or a leak has appeared.
Lubricant or air pressure has dropped or periodically drops.
Checking the components of the turbocharged system is required when the turbine is regularly shut down or damaged.

FORGISTO spoke in detail about the signs of turbocharger breakdown using the example of the Mitsubishi Pajero car.

Main reasons

If there are signs of a malfunction of the turbocharger, you cannot use the car until the cause is clarified and eliminated. Otherwise, the turbine can be completely damaged.

The reasons for the faults are as follows:

mechanical damage as a result of impact;
contaminated motor fluid;
lack of lubrication;
overheat.

Roman Lysenko told about the reasons for the turbine breakdown.

How to remove a turbine?

To change the turbine with your own hands, you must first dismantle it. The removal procedure can be performed in a garage.

What do you need?

Before removing the turbine, prepare for the task:

a set of screwdrivers - with a cross and flat tip, preferably of different lengths;
set of wrenches;
ratchet wrenches 1/2 and 1/4, preferably with extensions;
liquid WD-40.

Algorithm of actions

If the car is more than five years old, it is recommended to treat all fastening nuts and bolts with WD-40 the day before the removal procedure.

These are the elements for fastening the turbine to the manifold. This will facilitate the dismantling procedure.

The withdrawal process is as follows:

The power supply to the machine is cut off. For this, the terminals are disconnected from the battery in the engine compartment.
To perform work, it is necessary to provide free access to the unit. The turbine is located between two manifolds - the outlet and the inlet. If the car is rear-wheel drive, then the unit is installed to the right of the motor. If the car is equipped with front-wheel drive, then you need to look for the turbine to the left of the power unit.
All components and assemblies that may interfere with the removal of the turbine are being dismantled. Here you need to focus on the design features of the internal combustion engine. Dismantling may be interfered with by a generator device, battery or windshield washer system reservoir. The fasteners are removed and these elements are dismantled.
The turbines of modern cars are equipped with a variety of controllers. We are talking about a gas temperature control sensor, a pressure controller, the health of the unit, etc. Before dismantling the unit, it is necessary to disconnect these devices from the on-board network by removing the connectors. Failure to do so could damage the wiring.
The pipes of the cooling system are disconnected, as well as the lines of the lubrication system of the turbine cartridge. When disconnecting, it is recommended to mark the hoses so as not to confuse them during further installation. It is necessary to dismantle or disconnect the engine fluid drain line from the cartridge cavity to the crankcase of the power unit.
The next step will be to dismantle the turbocharger unit. It can be fixed on the appipe, downpipe or the power unit. First, a section of the highway is dismantled, which goes to the exhaust pipe. The sealing elements and nuts must not be lost during the task.
Then the upper line is disconnected, it is slightly easier to dismantle. Through this hose, the compressed air flow is supplied to the power unit, so the temperatures in this line are lower. As a result, the condition of the bolted connections is better.
If the turbine is fixed on the block, then this fastener must also be unscrewed. After that, the unit is disconnected from the manifold assembly and dismantled.

Channel Do-it-yourself repair Audi Q7, A6, VW talked about dismantling the turbine using the example of Audi and Volkswagen cars.

How to check a removed turbine?

Features of diagnostics of a removed turbine:

Cracks in the hot impeller manifold can be detected after disassembling the unit.
The wear of the sliding bearing elements as well as the shaft sleeves can be detected by touch. To do this, the unit must be moved in different directions, but this diagnostic method is inaccurate, since there may be a backlash on the new device. Only an experienced specialist can accurately determine this nuance, it is problematic for an ordinary motorist to do this.
Attention is drawn to the longitudinal and axial backlash. Ideally, the backlash should be no more than 1-2 mm. If it is larger, the unit must be repaired.
The rotation of the turbine elements must be smooth, jamming is not allowed.
If the dismantled unit is dry, then the backlash will be large. When the device is filled with motor fluid, the lubricant will create pressure, so the gap should be almost invisible. If the unit is in lubricant, the turbine must be replaced.
Diagnostics of the inner surfaces of the turbine is performed. If there is damage on the walls, this indicates that the surfaces are being scratched by the impeller.
The most accurate result will be provided by diagnostics of the unit geometry using a special stand.

VLADIMIR PROKUDIN spoke in detail about diagnostics of a turbocharger in a garage without geometry.

Turbine cleaning

You can restore the working condition of the unit by cleaning it; for this, it must first be disassembled. This procedure is performed in a garage.

What do you need?

To disassemble the unit and clean it, prepare:

wrench 10;
an asterisk key for 20;
hammer;
flat head screwdriver;
means WF-40;
sandpaper.

Algorithm of actions

The cleaning procedure is performed as follows:

The openings for the engine fluid must first be closed. This will ensure high-quality sealing of the unit and will prevent foreign objects from entering it.
Six screws are unscrewed around the unit. Three fasteners are provided to secure the actuator bracket. After unscrewing, the actuator is disconnected from the turbine; for this, the retaining ring is dismantled, a screwdriver is used. The action is carried out carefully so as not to damage the ring.
Sandpaper is used to clean the butt portion of the hot snail cartridge. The groove is cleaned and then filled with WD-40. It is better to leave the unit in this state overnight, this will allow high-quality oxidation of all dirt.
Then carefully knock with a hammer on the hot impeller. Tapping is done in a circle and without fanaticism in order to prevent damage to the unit. For greater convenience, the cold impeller can be clamped in a vice. After knocking on the unit for a few minutes, the hot impeller can detach from the cartridge, but it is important that it comes off evenly. If, as a result, the so-called snail is skewed, this will lead to its damage.
The cartridge with a cold impeller does not need to be disassembled, only the hot component can be disassembled. The guide rollers are dismantled, the ring that connects the blades is removed. After that, the three screws are unscrewed with an asterisk wrench. Having completed this task, three washers can be seen between the unit body and the impeller, they cannot be lost.
The carbon deposits are cleaned from the impeller housing, as well as the geometry. The device can be placed in a container with diesel fuel to remove dirt. It is allowed to use special attachments for a drill or sandpaper. The point is to disassemble and clean each blade separately. If these elements cling to the impeller housing, they need to be sharpened a little.
After cleaning, the assembly procedure is performed in reverse order. When tightening the screws with an asterisk wrench, do not overdo it, otherwise the fastening elements can be ripped off.

Cold and hot turbine impellers The inside of the hot impeller Hot snail body to be cleaned from carbon deposits

How to do it yourself?

In general, the installation procedure is carried out in the reverse order, but there are nuances when completing the task:

When performing the installation, it is necessary to take into account which parts from the old unit will be mounted back, and which ones must be replaced. These are bolts, sealing elements, studs and nuts. If the supply pipes are worn out, they must be replaced.
When installing the unit on a diesel engine, sealants are usually not used. But if the car owner decided to use them, it must be done carefully. It is important to prevent sealant from getting inside the pipeline.
When installing, pay attention to the openings of the oil line, drain, and also the cooling system. Especially if these lines are not connected with pipes.
Installation of all devices dismantled during the removal of the turbine is in progress. We are talking about a generator set, a battery, as well as a reservoir for the windshield washer system. When installing the alternator, it is important to properly tighten the drive strap to avoid loosening or pinching. Errors can lead to improper operation of electrical equipment and rapid belt wear.
At the end, the controllers are connected and a test run of the power unit is performed. The engine should idle for a while. Then the revolutions are increased to approximately 3500 per minute and the operation of the internal combustion engine is checked.

How much does a turbine cost?

Video "Replacing the turbine cartridge"

The Secret Garage channel spoke about the features and showed the procedure for repairing and replacing a turbocharger cartridge in a garage.