Pitfalls Renault Logan

The general concept of designing and manufacturing a car (read more here) involved the installation of engines that, firstly, were already in the Renault cohort, and secondly, they are economical and low-priced, and thirdly, they could digest not very high-quality fuel . Suitable engines have been found.

Initially, Logan was launched with Renault K7J, Renault K7M engines. Until now, most Logan in Russia, both new and used, drive with these engines. Renault K7J is power unit 1,390 cc (1.4), 75 horsepower at 5,500 rpm and 112 Nm of torque at 3,000 rpm. The Renault K7M has a displacement of 1,598 cc (1.6), a power of 84-87 horsepower and a torque of 124-130 Nm at 3000 rpm. The Renault K7J was installed in the Renault Clio, while the K7M was installed in the Renault Megane, Renault Scénic and the second generation Renault Clio. The difference in power and torque depends on the environmental class of the motor. Euro-2 versions, with which the car began to be produced, are more powerful. Modern Euro-4s have lost several horses and newtonometers.

To say that 1.4 and 1.6 are similar is to say nothing, they are the same in design, just different sizes. The displacement of the K7M engine is increased compared to the K7J engine by increasing the piston stroke, the cylinder diameter remains the same. In 1.6, the radius of the crankshaft crankshaft was increased, which, in turn, led to an increase in the height of the cylinder block, which is different for these engines. For the 1.6 engine, a clutch of a slightly larger diameter is also installed, so the flywheel is slightly enlarged and the shape of the gearbox housing is changed (the location of the threaded holes for attaching the gearbox to the cylinder blocks of these engines does not match).

Both engines are 8-valve, have a single camshaft. The valves are driven from the camshaft using rocker arms, resting on one shoulder on the camshaft cams and having bolts on the other shoulder to adjust the clearances in the valve mechanism with locknuts.

Logan 8-valve engine diagram

A popular article is circulating on the Internet that calls Logan engines technically backward and compares them with engines of almost the 30s. Of course, this material often uses the technique of distorting facts and a lot of factual errors, but one cannot but admit that the design of these engines is indeed very ancient. This is indicated both by the number of valves per cylinder (only 2) and the presence of rocker arms in the valve drive, as well as the absence of hydraulic compensators, which leads to the need to adjust the valves manually. At the same time, according to consumer qualities: resource, fuel consumption, traction at low speeds - these engines are very competitive. Only their power looks unsatisfactory for a modern driver, which is frankly small compared to 16-valve competitors.

With this in mind, since 2009, Avtoframos has been installing a Renault K4M engine on Logan, which already has 4 valves per cylinder. This engine was installed on Renault Laguna and is still installed on Renault Mégane, although for Logan it was somewhat simplified to be able to use 92 gasoline, because of this, power dropped. On Logan, this engine produces 102 “horses” at 5750 rpm and 145 Nm of torque at 3750 rpm. The automatic transmission version is 1 hp more powerful. and 2 N m. Why this is so is unknown.

Photo of a 16-valve Logan engine

Renault K4M engine more modern design than 8 valves. There are already hydraulic lifters, and not one coil for all cylinders is responsible for ignition, but individual ones. This engine is placed on the most expensive Logan, as well as on versions with automatic transmission.

According to the factory data, Logan with a 1.4 engine accelerates to 100 km / h in 13 seconds and has a top speed of 162 km / h. For Logan 1.6, these figures are 11.5 s and 175 km / h, respectively. Logan 16V is gaining a “hundred” in 10.5 seconds, and it has a “maximum speed” of 180 km / h. According to many drivers, the numbers are somewhat overestimated, especially in terms of dynamics.

There is no exact information about the resource of engines, but, judging by the messages on the forum, it must be recognized as large. With timely maintenance, engines can easily cover 300 thousand kilometers without repair. There is a case on the Logan Club forum when the Logan 1.4 glowed for half a million (2005 car, worked in a taxi) without engine repair. By the way, the myth that Logan engines are not repairable is not true. It is possible to repair motors, another thing is that it often does not make economic sense. It will be cheaper to buy a used engine at a disassembly (it costs 25-35 thousand rubles) with a minimum mileage and install it in your car.

Diagram of a 16-valve Logan engine

Factory data on fuel consumption are as follows. Logan 1.4: 9.4 liters - in the city, 5.5 liters - on the highway, 6.9 liters - in the combined cycle. Logan 1.6: 10 liters - in the city, 5.9 liters - on the highway, 7.3 liters - in the combined cycle. Sixteen-valve: 9.4 liters - in the city, 5.8 liters - on the highway, 7.1 liters - in the combined cycle. According to users when observing the speed limit real consumption turns out to be even lower than stated. But when driving on the highway with high speed and large traffic jams in the city, the consumption may be higher. We do not agree with the opinion of those who consider Logan a voracious machine. With manual transmission, Logan consumption is no more than that of classmates with similar engine sizes, the version with automatic transmission is another matter. Here the numbers are really high (we recall that the engine is only 16-valve): 11.8 liters - in the city, 6.7 liters - on the highway, 8.4 liters - in the combined cycle, but this is more related to the outdated "automatic", not with the engine.

All Logan engines work quietly on 92 gasoline, which is even recommended by most dealers. However, 95 can also be used, which some users do. According to their calculations, it turns out to be more profitable financially. An extensive field for using 95 gasoline opens up after chip tuning: many authors offer firmware for Logan specifically for this gasoline.

Maintenance of Logan engines is not much different from the engines of other cars. The regulation every 15 thousand kilometers provides for the replacement engine oil, oil filter and spark plugs. An important feature is the need to change the timing belt every 60 thousand kilometers. All Logan engines bend the valve when the belt breaks, so this recommendation should not be neglected, otherwise you can “fly in” for expensive repairs. The belt and rollers for replacement, due to the importance of the units, it is better to buy the original ones, fortunately, they are not very expensive.

The choice of engine for Logan is quite simple, but has its own characteristics. The difference in price with similar trim levels is not that very big, but there is. In the Expression configuration, an 8-valve 1.6 will cost 15 thousand rubles more than 1.4, and in the Prestige a 16-valve is more expensive than an 8-valve 1.6 by 22 thousand rubles.

The difference between the 8-valve engines is most noticeable, firstly, when using the air conditioner, and, secondly, when overtaking on the highway. Therefore, driving around the city by car in the basic configuration of 1.4 is quite enough, but if most of the mileage is on the highway and / or there is air conditioning, then it is better to look towards 1.6. Between 8 and 16 valves, the choice is more difficult. According to many, additional valves begin to play a significant role at speeds above 80 km / h, that is, also, consider on the highway, but for those who travel more around the city, it is not necessary to overpay. At the same time, however, a 16-valve engine is more economical and can return part of its cost with fuel costs.

Wrote material for Logan-News magazine.

Applicability on cars

Budget car models Renault Logan 1.4 and Logan 1.6 for almost a decade of presence on Russian roads have managed to win the recognition of many thousands of motorists. The concept of a French manufacturer who decided back in 1998 to create an inexpensive and practical a car, intended for emerging markets, in Russia received the most triumphant continuation and unexpected development. If in 2005 it all started on a small site of the Avtoframos enterprise in Moscow with a “screwdriver” assembly of several thousand cars a month, today the Volga Automobile Plant is already building its annual plans based on a whole “Logan” model scattering: Renault Logan, Renault Sandero, Lada Largus. Sales of these three models in the country in 2014 exceeded 160,000 units.

To a large extent, such popularity of these Renault models was ensured by the use of proven and well-proven single-shaft internal combustion engines (ICE) of the K7J 1.4 l and K7M 1.6 l series as power units. The flagship of the line for Renault Logan is considered to be a 16V four-cylinder liquid-cooled unit with the K4M index, the production of which, in addition to the parent company Renault Espana, is also mastered at AvtoVAZ production sites. This 16-cap engine with decent technical characteristics is still equipped with other Renault models (Sandero, Duster, Kangoo, Megane, Fluence), as well as Lada Largus and Nissan Almera G11.

Design features and specifications of internal combustion engines

Engine design K7J (manufacturer Automobile Dacia, Romania) 1.4 l / 75 hp inherited from fairly old Renault Corporation engines of the 80s (ExJ series) and therefore looks somewhat archaic: here is an unusual oil pump chain drive used on units with lower camshafts, and ancient timing rocker arms. The remaining solutions of the 1.4 engine are standard and do not differ in any way from other four-stroke 4-cylinder single-shaft engines of the SOHC type: the cylinder arrangement is in-line vertical, 2 valves per cylinder, timing drive from a toothed belt, liquid cooling and a combined lubrication system (lubrication is supplied to the most loaded parts of the internal combustion engine under pressure, to all others - by simple spraying). K7J is more than 400 thousand kilometers. Motor 1.4 provides the car with the following dynamics: the maximum speed is 162 km / h, it picks up a hundred in 13 seconds.

Renault Logan K7M 710 engine and its successor K7M 800 (manufactured by the same Automobile Dacia) 1.6 l and 86 hp. (K7M 800 - 82 hp) are almost identical in design to the K7J, they are also liquid-cooled, but have a piston stroke increased by 10.5 mm, obtained by changing the height of the block. A different clutch and flywheel (larger diameter) are also used, and the gearbox housing has minor reshaping. The K7M resource also exceeds 400 thousand km in mileage. Dynamic characteristics of the motor: speed at a maximum of 172 km / h, 100 km / h - in 11.9 seconds, unlike 1.4.

The greatest differences in design and performance are observed in the K4M engine, despite the fact that this ICE is 1.6 l and 102 hp. is also just another development of the K7M series. All-new 16-valve cylinder head with two lightweight camshafts and a new piston system. Here, finally, the need for constant adjustment of the internal combustion engine valves through fairly short runs is eliminated, eliminated by the simple use of well-known hydraulic compensators. The motor accelerates the car to 100 km / h in 10.5 seconds, reaching a maximum of 180 km - very good performance. frankly weaknesses in this unit is no longer there: the necessary changes have been made to the system in terms of the pump and thermostat, and the ignition module has also undergone refinement.

Advantages and disadvantages of power units

Considerable experience in operating Renault cars with all three types of liquid-cooled engines allows us to build a fairly objective picture of their strengths and weaknesses, moreover, for the two models K7J and K7M, these characteristics are almost identical, and only the K4M engine has significant differences due to more modern technological solutions, and which one is better is up to the buyers to decide.

Advantages of K7J and K7M:

• low cost and simplicity of engine design;
• reliability: proven motor resource is more than 400 thousand km;
• versatility and maintainability;
• ease of maintenance;
• high torque;
• good "elasticity" of engines, equal to 1.83.

Disadvantages of K7J and K7M:

• relatively high fuel consumption;
• instability of revolutions when idling;
• the absence of hydraulic compensators in the design, as a result, the need for constant adjustment of the valves (after 20-30 thousand km);
• "Bending" of the valves in the event of a sudden break in the timing belt;
• increased "fluidity" of crankshaft oil seals;
• poor reliability of the elements of the cooling system;
• noise and vibration.

The advantages of the K7M model over the K7J include only increased maximum power by 12% and maximum torque by 11%. But the 1.6 liter internal combustion engine pays for these advantages with a 4.5% increase in appetite, so which is better is a moot point.

Advantages of K4M:

• reliability, practical resource exceeds 400 thousand kilometers;
• compliance with Euro-4 environmental standards;
• increased power (102 hp);
• low noise and vibration resistance;
• more modern and reliable cooling system.

Compared to 8-valve engines, the K4M 16V is much quieter, not subject to vibrations and has the same resource, but much more power and torque.

Disadvantages of the K4M motor:

• expensive spare parts;
• "Bending" of the valves when the belt breaks;
• weak "elasticity" of the engine, equal to the value of 1.53, as a result - problems with the acceleration of the car when overtaking.

Thus, a detailed analysis of the technical characteristics of all three ICE samples, as well as practical experience operating Renault Logan with these power plants allows you to decide which engine is better. A more powerful liquid-cooled 1.6 liter internal combustion engine is still somewhat preferable to its “big brother” 1.4 liter. Power 75 hp it is simply not enough for comfortable driving a loaded car either on a country road or in short “rushes” around the city. And in the dispute between a 16V motor and an 8V motor, the undisputed leader is the first sample. The only characteristic on which 16V loses to its opponent is “elasticity”. For the rest of the same characteristics, 16V is better better. Renault's liquid-cooled V16 engine is simply much more modern and gives more options to the driver.

Auto Renault Logan is a class B car of the budget series, which was developed by companies to fill emerging markets. The internal content of the machine, incl. and Renault Logan engine in its variations, created on the so-called "platform B0". Note that back in 1999, the Romanian plant of the Dacia group entered the assets of Renault, and to this day the main production of cars has been deployed there.

Modern Logan boasts style, agility, speed and strength, which to a greater extent provides the Renault Logan engine in any road conditions: on highways, in traffic jams, and outside the city. This car will be a wonderful companion for active sports people and in general always makes a good impression. This modest Frenchman is actually not as simple as it might seem - he has something to offer the car enthusiast, and even more.

Regardless of which engine a Renault Logan can have, it is a reliable source of mechanical energy in order to set the car in motion. Its power determines what will be the maximum speed of movement, as well as the ability to overtake.
For every car company that values ​​its image, it is important to never stop presenting innovative developments to its consumers. If you look at the Logan engine, the price of which harmoniously fits into the total cost of the car, then only positive features can be distinguished here: a brilliant engineering capability that is well combined with solid market attractiveness. In general, the Renault brand boldly faces its competitors and continues to develop actively.

Before answering the Renault Logan question which engine is better and more efficient, you need to familiarize yourself with this issue in more detail. Indeed, Logan engines vary in power, volume, valve system. The car is economical due to the ability to use both diesel fuel and gasoline as fuel. Leading manufacturers are convinced that the reviews about the Renault Logan engine of many car owners confirm that both types of engine will not lose their positions and will not exhaust their potential. Therefore, all auto companies regularly invest substantial sums in the development of these types of motors, in order to achieve even more power with reduced carbon dioxide emissions into the atmosphere. And the price of the Renault Logan engine will, accordingly, decrease due to mass sales.

Engine Logan 1.6

Today Russian market can offer Renault Logan cars in several variations, including the Logan 1.6 engine with 8 and 16 valves. So, the eight-valve Renault engine with a volume of 1.6 liters is gasoline, with a power of 84 horses, which is capable of delivering a torque of 124 N * m at low speeds at 3000 rpm. Such a Renault Logan 1.6 engine provides a comfortable ride, consuming 7.2 liters per 100 kilometers. Note that the power of this engine has changed after the restyling of Logan - before that, the engine had a power of 86 horsepower. This mechanism has decent traction, it accelerates perfectly to maximum speeds. In the city, the Renault Logan 1 6 engine demonstrates sufficient maneuverability, and on country roads and roads - proven ease of handling in practice. Logan motors, which are now supplied to the CIS countries, fully comply with environmental standards. This is true, because the Renault Logan 1.6 engine, the price of which satisfies the demand in the domestic car market, does not exaggerate the permitted amount of bad substances in exhaust gases.

Engine Logan 1.4

The eight-valve Logan 1.4 engine is gasoline in its type, with a capacity of 75 horses. Fuel consumption is 6.9 liters per 100 kilometers. At 3000 rpm it can develop a torque of 112 N * m. Note that the operating air conditioner affects the motor power - it can significantly reduce it. However, such problems are inherent not only in car models in which the Renault Logan 1.4 engine is installed, but also in others. His positive trait- low noise level in the cabin when the engine is running.

Despite this, when buying a new French Renault Logan, you can be sure of the well-coordinated work of a high-quality engine, which is the Renault Logan 1 4 engine and others from the Logan series.

Engine Logan 16 valve

The last engine from the Renault Logan series is the Logan 16 valve engine with a volume of 1.6 liters. It is considered the most powerful of all gasoline engines in the Renault Logan series. Its power is 102 horsepower, torque at 3750 rpm reaches 145 N * m. This Renault Logan 16v engine has excellent dynamics with reasonable fuel consumption, which is only 7.1 liters per 100 kilometers. By purchasing a foreign car in which the Renault Logan 1.6 16 valve engine will be built, you get a car High Quality. With distributed fuel injection, the electronic engine control system fulfills modern standards for the emission of toxic fumes, while high driving performance of the car is maintained, including low fuel consumption. If we compare the Renault Logan 16-valve engine with a similar 1.4-liter and 8-valve 1.6-liter engine, then we can safely say that these models differ slightly from each other. Although the 1.6 16v Renault Logan engine and a similar 8-valve engine are slightly faster and more dynamic than the 1.4-liter one, in general, this is where the differences end. Thus, the carefully thought-out Logan 1.6 16v engine will provide a quiet economical ride for the domestic motorist.

Logan engine specifications

As mentioned above, Renault Logan engine characteristics are optimal in all respects. At the same time, the car cannot be called a budget car, and this is confirmed by the reviews of many car owners in Russia and the CIS countries.

Today, models with exclusively gasoline engines, however, and here you will have plenty to choose from. The qualitative characteristics of the Renault Logan engine make this car suitable for driving on good city and uneven country roads. The above was given short description of what engine size Renault Logan has variations of this car (1.4 liters, 1.6 liters with 8 and 16 valves). In general, they have few differences, including increased speed and dynamism. Each model has excellent fuel economy and reliability. The good power of the Renault Logan engine in the amount of 75, 84, 102 horses, starting from an engine with a volume of 1.4 liters, respectively, is what you need for a fast, easy and comfortable ride.

Let's take a closer look at the Renault Logan engine and its features.

Logan engine device

On a Renault Logan car, depending on the displacement, 2 types of engine are installed - K7J - 1.4 liters, K7M - 1.6 liters. In the Logan car, the engine design of both types is identical, the working volume has been increased due to the larger piston stroke (larger radius of the crankshaft crank).

Each engine is a gasoline, four-cylinder, four-stroke, in-line, eight-valve, with an overhead camshaft.

The engine power system is a distributed fuel injection.

Together with the clutch and gearbox, the engine forms a power unit. In the engine compartment, it is held in the amount of three pieces - a rubber-metal elastic part. So, the right support is attached to the bracket (the upper cover of the timing belt), the rear and left - to the gearbox housing.

The engine cylinder block is cast iron, all cylinders are bored directly into it (the nominal diameter of each is 79.5 millimeters).

The important point is to find and write down the Logan engine number in order to quickly select the necessary part in the event of a breakdown. So, the number and model of your engine are located on the left rear of the engine block tide. For example, the inscription K7MF710 indicates an 8-valve model of your 1.6-liter engine with a multiport fuel injection system; and UA00000 is the Renault Logan engine number of the corresponding model.

Let's continue the review of the cylinder block device. In its lower part there are 5 crankshaft main bearing supports with removable covers, bolted to the block. The bearing bores in the block are machined with the covers installed, so they are not interchangeable and are marked on the outside for differentiation. The average Renault Logan engine mount has sockets on the end surface for thrust half rings, which prevent the crankshaft from moving along the axis.

The connecting rod and main bearings of the crankshaft have thin-walled, steel liners with anti-friction coating on the working surfaces. The crankshaft with 4 connecting rods and 5 main journals has 4 counterweights cast with it. The oil supply to the connecting rod journals from the main ones occurs through channels, whose two outlets have plugs at the ends.

We investigate the device of the Renault Logan engine further. On the toe of the crankshaft are installed: a toothed pulley for the timing drive and auxiliary units, an oil pump drive sprocket. The protrusion in the hole of the toothed pulley enters the channel at the front end of the crankshaft and does not allow the pulley to turn, the same with the VA drive pulley. Seven bolts attach a cast-iron flywheel with a pressed steel crown to the crankshaft flange to start the engine with a starter.

In a Renault Logan car, engine malfunctions occur quite rarely due to the carefully thought-out design features of the car.

The piston of the car in the upper part has 3 grooves, machined for 4 piston rings (2 upper ones are compression rings, 2 lower ones are oil scraper rings).
The cylinder head is centered on it with 2 bushings and fastened with 10 screws. On top of the cylinder head are 5 camshaft bearings, which are inserted into them from the timing side.

Renault Logan has a really well thought out engine layout. The extreme support neck of the camshaft (from the flywheel) has a groove, which includes a thrust flange that prevents the shaft from moving along the axis. This part is attached to the block head with 2 screws. From above, the axis of the rocker arm of the valves is attached to the supports of the camshaft with 5 bolts. The screws screwed into the rocker arm regulate the thermal gaps in the valve drive. The valves are arranged obliquely to the plane passing through the axis of the cylinders in 2 rows. Ahead (in the direction of the car) are exhaust valves in a row, behind - inlet.

Obviously, the Renault Logan engine mount is made with high quality.

So, the valve opens with the help of a rocker arm, which at one end rests on the camshaft cam, and at the other end on the end of the valve stem, through the adjusting screw. The valve closes under the action of a spring.

An important role is played by the high-quality protection of the Logan engine from external factors, which once again indicates that the Renault Logan motor demonstrates excellent performance. The engine compartment is subject to contamination in any weather, and to protect it, a Renault Logan engine mudguard is mounted on the sides and bottom of the engine compartment, which is a non-power protection of the engine crankcase. Recall that the crankcase is necessary for installing the crankshaft of the motor and its other parts. While the Renault Logan engine mudguard is a separate part, the crankcase is cast simultaneously with the cylinder block and is closed from the bottom with a pallet made of sheet steel. The latter protects the crankcase of the Renault Logan engine from pollution, damage from stones flying out from under the wheels, and at the same time is an oil reservoir. It should be noted that a steel shield cannot protect the motor crankcase from very strong blows and serious obstacles on the road - curbs, stumps, big stones, since it is able to bend to the crank mechanism, and Renault Logan engine protection will not be fully ensured. In case of damage to the protection, it is necessary to remove it and the mudguard in order to gain access to the units and components from the bottom of the car, and carry out the necessary maintenance or repairs.

Logan engine repair

French quality proven over the years and experience of tens of thousands of car owners extends to the car of this brand. As mentioned earlier, Renault Logan engine repairs are quite rare, but they also take place. Even such a car may experience an overrun of lubrication, a decrease in power, third-party noises or knocks. In order to support uninterrupted operation, it is necessary to diagnose the Renault Logan engine and the entire car as a whole.

It is important to know that the Logan engine resource is quite solid. So, guaranteed this car is able to pass without overhaul up to 300,000 km, and on good roads - all 400,000 km.

The passage of modern computer diagnostics and overhaul often gives a greater effect than self-identification and elimination of problems. It is necessary to take this fact for granted, since a timely check can even increase Renault Logan's engine life by several orders of magnitude.

When diagnosing the engine, you (or car service workers) will need to comprehensive study of your car: check the operation of all actuators and sensors, compression in the engine cylinders, the condition of the spark plugs and the quality of sparking in each combustion chamber, check the engine lubrication system for oil leakage and pressure, valve guides and piston groups for wear, and much more .

A good motor resource of the Renault Logan engine in its good condition is an achievable goal. Remember that this conditional indicator is influenced by many factors - the assembly of the motor, the area where the car is used (mountainous terrain, plain, road quality in general), weather conditions (dustiness, humidity, frost, heat), the quality of the lubricants used and driving style. After all, if anything, then passengers will be saved in what can not be said about the engine. What resource of the Renault Logan engine in a particular car really depends on many external factors.

Logan engine oil

The manufacturer of Renault cars recommends changing the oil in the Logan engine every 15 thousand km of normal mileage or every 7.5 thousand km of run in difficult operating conditions. ELF Evolution SXR 5w30 oil is by far the most recommended product, since an oil with a high viscosity for a Logan engine can lead to its rapid wear due to increased friction in pairs. If the oil poured into the engine by Renault Logan is not viscous enough, the liners may scorch due to a fragile oil film.
The Renault Logan motor has a combined lubricant. The connecting rod bearings of the crankshaft and the bearings of the camshaft are lubricated under pressure, and other components of the motor are lubricated by splashing. The gear oil pump is located in front of the Renault Logan engine sump and is attached to the side of the cylinders. The oil pump is driven from the crankshaft by a chain drive.

To change the oil yourself, you will need an oil filter, 4 liters of oil, an “8” square key, a filter remover, and preferably a steel washer under the drain plug.

Remove the oil filler cap at the top of the engine, loosen the drain plug from below with a wrench. Substitute a container with a volume of at least 4 liters to drain the oil, unscrew the plug to the end. Drain the Logan oil into the engine within 10 minutes. Change the oil filter if necessary. After opening it, clean its place from dirt and oil drips, apply new oil to the seal. Fill the filter with oil approximately ?. , wrap the filter two-thirds of a turn. Pour about 3.3 liters of oil through the top head and close the filler cap. So, knowing the volume of oil in the Logan engine, which is 4 liters for engines of 1.4 liters and 1.6 liters, you can change the oil yourself. Be sure to start the engine to make sure the low oil pressure light goes out. Next, turn off the engine, see if there are any drips from under the drain hole or filter. After we check the amount (level) of oil from the motor and top up to normal if necessary.

Renault Logan engine cooling system

The liquid cooling system of the Renault Logan engine is completely sealed, equipped with an expansion tank and a forced circulation function. Antifreeze based on ethylene glycol, filling the cooling system, does not freeze even at temperatures environment-40 °С.

Since the coolant is toxic, avoid contact with the skin and do not inhale its fumes. Therefore, it is especially important to monitor the tightness of the system.

The Logan engine cooling system itself consists of a radiator, a water pump, expansion tank, hoses, engine cooling jackets, as well as the radiator of the heating system in the car.

The thermal regime of the car engine depends on the temperature of the coolant, which is automatically maintained by the thermostat in the range of 90–100 °C.

Thanks to a thermostat with a solid temperature-sensitive filler that maintains optimal operating temperature coolant, in Renault Logan, engine warm-up is significantly reduced. It is mounted on the rear end of the cylinder block. If the coolant temperature is below 88°C, the thermostat closes and the coolant circulates only in a small circle, bypassing the radiator, which speeds up engine warm-up. At 89°C, the thermostat opens slightly, and when heated to 99 ± 2°C, it opens completely, passing liquid into the radiator.

At Renault Logan, the engine temperature is maintained by a radiator with an aluminum tubular-tape core. The expansion tank is designed to compensate for the increasing volume of coolant. It is made of translucent plastic, with “MAX” and “MIN” marks printed on the walls to control the level of coolant. The filling hole located on top is hermetically sealed with a plastic stopper.

Despite the powerful cooling system, an unpleasant overheating of the Renault Logan engine can sometimes occur. This happens when there is a malfunction in the thermostat, electric fan, valve malfunction, or general depressurization of the cooling system. Another reason for boiling can be a breakdown of the water pump, which provides forced circulation of the liquid. The pump, like some other components of the car, cannot be repaired, and if it malfunctions, it is completely changed.

In a Logan car, the engine temperature is maintained at a certain level thanks to the technical means of the cooling system. For example, an exhaust valve that opens when pressure increases, which ensures that the temperature of the coolant rises and prevents intense vaporization. The inlet valve, which opens when the pressure drops, lets air into the expansion tank. For the normal operation of the cooling system, the serviceability of the plug valves is very important.

Engine tuning Logan

Each car can be upgraded, improved technical specifications. One of milestones tuning is the tuning of the Logan engine and all its components. The important characteristics of an engine are its power, torque, horsepower and fuel consumption. Changing one of the parameters will increase or decrease the others. It must be remembered that tuning can increase engine wear and void the original engine or vehicle warranty.

Some auto repair shops offer various tuning of the Renault Logan engine and not only, but many car owners upgrade their iron horse with their own hands. Someone puts superchargers or turbines, someone replaces the camshaft, which gives a significant increase in power, and someone makes a replacement for the standard firmware. The main thing is to do everything thoughtfully and accurately, then the car will serve faithfully for more than one year.

An engine with 8 valves and 16 can be installed on the Renault Logan sedan. Thus, the volume varies either 1.6 and 1.4 liters. Both types of motor are quite reliable in operation, as evidenced by the reviews of motorists. At the same time, it should be remembered that the valves must be periodically adjusted. This procedure is aimed at leveling non-standard clearances in the valve mechanism, which were formed as a result of the expansion of metals due to high operating temperatures. At the same time, the adjustment of valves is the fulfillment of a number of technological tolerances. It is made between the adjusting bolt and the rod of the drive part.

In the event of deviations from the standards prescribed in technical passport car Renault Logan, there is an increased wear of components. In addition, there are a number of prerequisites that indicate the need for repair work of a particular category. The most significant hint of repair is an uncharacteristic tapping in the engine compartment when working on idling.

Due to the fact that an abnormal gap has arisen between the parts, a decrease in power is observed. This is due to the insufficient amount of combustible mixture supplied to the cylinders. Such problems can happen equally on 1.4 and 1.6 engines.

What do you need to have on hand and know when making such repairs?

This category of repair is within the power of any motorist who has a similar Renault Logan sedan. But for this you need to have a certain amount of knowledge and have the required tool available. Here is a list of a set of tools that you can not do without:

• a set of screws of a certain type;
• pliers;
• open-end wrench for 13;
• open-end wrench for 10;
• ordinary screwdriver.

Renault Logan owners must carry out routine adjustment of the valve system after every 100 thousand kilometers, regardless of whether there are 8 valves or 16 in the engine. However, most experts do not agree with this frequency. They believe that valve adjustment should be done more often, every 60 thousand km. Drivers with a long history of operating Renault Logan say that driving on gas instead of gasoline will adversely affect the valves. First of all, there is a drawdown of the saddle. There is a launch into the gas chamber, and not fuel due to incorrect gaps that have arisen.

Specialists at VIP-class car services adjust the Renault Logan valve system every 30 thousand km, regardless of the engine rating, 1.4 and 1.6.

When carrying out such repair actions, it is necessary to remember the standards for clearances. These are the values:

• Intake valve clearances range from 0.1mm to 0.15mm;
• Exhaust valves must have a gap between 0.25 mm and 30 mm.

If new exhaust valves 8 or 16 are being installed, then the gap should be increased for them to pass grinding. In this case, the range changes to 0.2-0.25mm

Complete do-it-yourself adjustment sequence

Immediately before adjusting actions in the valve mechanism, all tension belts are inspected. If sagging is found, it should be eliminated. Now everything is ready and the valves are being adjusted.

1. Initially, the bolts are unscrewed, of which there are four. With the help of them, the filter elements are fixed on the housing. Then all the pipes are disconnected and the filter located in the Renault Logan power unit is removed;
2. At this stage, you should be extremely careful, as it affects the safety of further repair activities. Disconnect the wires suitable for the candles. They are of the high voltage type;
3. The next step is to dismantle the valve system. 4 bolts are unscrewed in sequence. This cover must be removed and set aside;
4. Here we go straight to piston group. The cylinder must be placed in a position that corresponds to the dead center at the top;
5. Then the locknut is loosened. A probe is inserted into the opened gap, which has the required dimensions prescribed by the standards for this category of valve;

1. Then, the adjusting bolt is tightened until the inserted probe begins to move after a significant application of force to it;
2. Then you should repeat the procedure with the second and subsequent cylinders;
3. At the end of the adjustment measures, it is necessary to reassemble the entire mechanism and also fix all previously removed filters in the right places.

Upon completion of all operations, we can safely say that the valve adjustment on Renault Logan was successful. It is important to remember that the most optimal frequency for adjusting the valve mechanism on the French Renault Logan sedan is 30 thousand km.