Today it determines not only the overall price of a budget car, but also fuel consumption and the dynamics of a budget sedan. Now we will tell you in detail about the Logan engines of the first and second generation of the car. We’ll pay special attention to engines for the Russian market, and we’ll also talk a little about the versions of power units that are offered in other markets.

So, first generation Renault Logan appeared in our country in 2005 with two gasoline engines with an 8-valve timing mechanism and a timing belt. These are 1.4 MPi and 1.6 MPi engines. The engines themselves were closest relatives, since they were structurally similar, the difference was only in the working volume. The increase in engine capacity of the 1.6 was achieved due to a new crankshaft and a taller cylinder block. That is, in fact, only the piston stroke increased from 70 to 80.5 mm. Both units are gasoline, four-stroke, four-cylinder, in-line, eight-valve, with an overhead camshaft.

The power supply system is distributed fuel injection (Euro-2 toxicity standards). The power of the 1.4-liter engine was 75 hp, the 1.6 engine at Euro-2 produced up to 87 hp. However, with an increase in the environmental standard to Euro-4, the power decreased to 82-83 horsepower. The 1.4 MPi engine had the factory index K7J; the more powerful 1.6-liter Logan engine model received the index K7M.

Structurally, both engines had a cast iron block, an aluminum cylinder head, one camshaft, and a timing belt. As for the valve mechanism, there were no hydraulic compensators to automatically adjust the thermal clearance, that is, the valve clearance had to be periodically adjusted manually. Another important point is that if the timing belt breaks, the valves on these engines very often bend. Below are more detailed characteristics of the engines of the first Renault Logan -

Engine Renault Logan 1.4 MPi 75 hp (model K7J) characteristics, fuel consumption, dynamics

• Working volume – 1390 cm3
• Number of cylinders – 4
• Number of valves – 8
• Cylinder diameter – 79.5 mm
• Piston stroke – 70 mm
• Power hp/kW – 75/56 at 5500 rpm
• Torque – 112 Nm at 3000 rpm
• Maximum speed – 162 kilometers per hour
• Acceleration to the first hundred – 13 seconds
• Fuel consumption in the city – 9.2 liters
• Fuel consumption in the combined cycle – 6.8 liters
• Fuel consumption on the highway - 5.5 liters

Engine Renault Logan 1.6 MPi 87 hp (model K7M) characteristics, fuel consumption, dynamics

• Working volume – 1598 cm3
• Number of cylinders – 4
• Number of valves – 8
• Cylinder diameter – 79.5 mm
• Piston stroke – 80.5 mm
• Power hp/kW – 87/64 at 5500 rpm
• Torque – 128 Nm at 3000 rpm
• Maximum speed – 175 kilometers per hour
• Acceleration to the first hundred – 11.5 seconds
• Fuel consumption in the city – 10 liters
• Fuel consumption in the combined cycle – 7.2 liters
• Fuel consumption on the highway - 5.7 liters

Later, Renault Logan received a more powerful gasoline engine with 16 valves and a displacement of 1.6 liters. Essentially the same 1.6 K7M engine, but with a different cylinder head. Now there are two camshafts in the timing drive, and the power has increased to 102 hp. The new Renault Logan engine received the K4M index. The new DOHC cylinder head received hydraulic compensators; now there is no need to manually adjust the valves. If the timing belt on a 1.6 16V engine breaks, the valves bend, keep this in mind if you don’t want to have to undergo major cylinder head repairs. Below are more detailed characteristics of this Logan engine -

Engine Renault Logan 1.6 16V 102 hp (model K4M) characteristics, fuel consumption, dynamics

• Working volume – 1598 cm3
• Number of cylinders – 4
• Number of valves – 16
• Cylinder diameter – 79.5 mm
• Piston stroke – 80.5 mm
• Power hp/kW – 102/75 at 5700 rpm
• Torque – 145 Nm at 3750 rpm
• Maximum speed – 180 kilometers per hour
• Acceleration to the first hundred – 10.5 seconds
• Fuel consumption in the city – 9.4 liters
• Fuel consumption in the combined cycle – 7.1 liters
• Fuel consumption on the highway - 5.8 liters

Second generation Renault Logan In addition to 8 and 16-valve engines with a volume of 1.6 liters, it received a completely new 16-valve engine with a displacement of only 1.2 liters (engine model D4F). In particular, it is already being installed on Sandero. Actually, the engine itself “grew” from an ancient 8-valve engine (engine model D7F) of the same volume, which produced a ridiculous 59 hp. The appearance of a new cylinder head with 16 valves increased the power to 75 hp. In fact, this is a replacement for the retired 8-valve 1.4-liter engine that was installed on the first Logan. The design of the 16-valve mechanism is interesting. A feature of which is only one camshaft, which is controlled with all 16 valves using rocker arms. The timing drive is again driven by a belt. Characteristics of the new engine for Logan/Sandero below –

Engine Renault Logan/Sandero 1.2 16V 75 hp (model D4F) characteristics, fuel consumption, dynamics

• Working volume – 1149 cm3
• Number of cylinders – 4
• Number of valves – 16
• Cylinder diameter – 69.0 mm
• Piston stroke – 76.8 mm
• Power hp/kW – 75/55 at 5500 rpm
• Torque – 107 Nm at 4250 rpm
• Maximum speed – 156 kilometers per hour
• Acceleration to the first hundred – 14.5 seconds
• Fuel consumption in the city – 7.7 liters
• Fuel consumption in the combined cycle – 6 liters
• Fuel consumption on the highway - 5.1 liters

It is worth noting a number of engines that are installed on Logan for foreign markets. For example, in Brazil there is a 16-valve engine with a capacity of only 1 liter and a power of 76 hp. This naturally aspirated vehicle can consume not only gasoline, but also ethyl alcohol, which is what some of the transport in this Latin American country uses. It just so happens that distilling ethyl alcohol from cane sugar is much cheaper than distilling oil into gasoline.

In Europe, a new turbocharged 3-cylinder engine with a displacement of only 0.9 liters is gaining popularity. At the same time, the power unit produces 90 hp. and good torque. In other markets they offer several variants of the 1.5 dCi diesel engine with power ranging from 75 to 85 hp. These engines are very popular in India, although there Logan is called Mahindra Verito, by the way, in Mexico it was called Nissan Aprio. In general, a global model with a large selection of power units for every taste.

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Review of the K7M gasoline engine of the Renault Logan car

Renault Logan cars are equipped with K7M and K7J gasoline engines. These engines are identical in design and differ only in displacement.

The K7M engine of Renault Logan cars has a displacement of 1.6 liters, and the K7J engine has a displacement of 1.4 liters. The increase in displacement is obtained due to the larger radius of the crankshaft crank/longer piston stroke.

Brief technical characteristics of the Renault Logan K7M engine

Type - Gasoline, 4-stroke, 4-cylinder, in-line, 8-valve

Location - Front, transverse

Engine power system - Distributed fuel injection

Cylinder diameter and piston stroke, mm - 79.5x80.5

Working volume, cm3 - 1598

Compression ratio - 9.5

Rated power, kW (hp) - 64 (87) at a crankshaft speed of 5500 rpm

Maximum torque, Nm - 128 at a crankshaft speed of 3000 rpm

Fuel - Unleaded gasoline with an octane rating of at least 91

Ignition system - Electronic, part of the engine management system

Fig.1. Engine K7M Renault Logan with auxiliary units

1 - air conditioning compressor; 2 - auxiliary drive belt; 3 - generator; 4 - power steering pump; 5 - oil level indicator (oil dipstick); 6 - cylinder head cover; 7 - ignition coil; 8 - spark plugs; 9 - cylinder head; 10 - thermostat housing; 11 - exhaust manifold; 12 - coolant pump pipe; 13 - oxygen concentration sensor; 14 - oil pressure sensor; 15 - technological plug; 16 - flywheel; 17 - cylinder block; 18 - oil pan; 19 - oil filter

The K7M engine of the Renault Logan car is gasoline, four-stroke, four-cylinder, in-line, eight-valve, with an overhead camshaft. The operating order of the cylinders is: 1–3–4–2, counting from the flywheel.

The Renault Logan engine power supply system is distributed fuel injection (Euro-2 toxicity standards). The K7M engine with the gearbox and clutch form the power unit - a single unit mounted in the engine compartment on three elastic rubber-metal supports.

Fig.2. Renault Logan engine (Power unit)

1 - gearbox; 2 - crankshaft position sensor; 3 - inlet pipeline; 4 - absolute air pressure sensor in the intake manifold; 5 - intake air temperature sensor; 6 - throttle assembly; 7 - idle speed regulator; 8 - oil filler cap; 9 - fuel rail; 10 - oil level indicator (oil dipstick); 11 - cylinder head; 12 - cylinder block; 13 - auxiliary drive belt; 14 - oil pan; 15 - knock sensor; 16 - support bracket for the intake pipeline; 17 - starter; 18 - vehicle speed sensor

The right support is attached to the bracket on the top cover of the timing belt, and the left and rear ones are attached to the gearbox housing.

The cylinder block of the Renault Logan engine is cast from cast iron, the cylinders are bored directly into the block. The nominal diameter of the cylinder is 79.5 mm. At the bottom of the cylinder block there are five crankshaft main bearing supports with removable caps, which are attached to the block with special bolts.

The holes in the cylinder block of the K7M Renault Logan engine for bearings are machined with the covers installed, so the covers are not interchangeable and are marked on the outer surface to distinguish them (the covers are counted from the flywheel side).

On the end surfaces of the middle support there are sockets for thrust half-rings that prevent axial movement of the crankshaft.

The main and connecting rod bearing shells of the crankshaft of the Renault Logan engine are steel, thin-walled with an anti-friction coating applied to the working surfaces.

Crankshaft with five main and four connecting rod journals. The shaft is equipped with four counterweights 1 (p. 64), cast together with it. To supply oil from the main journals to the connecting rods, channels 2 are used, the outlet holes of which are closed with plugs.

At the front end (toe) of the crankshaft of the K7M engine are installed: an oil pump drive sprocket, a timing gear drive pulley and an auxiliary drive pulley.

In the hole of the toothed pulley there is a protrusion that fits into a groove on the toe of the crankshaft and secures the pulley from turning. The drive pulley for auxiliary units is similarly fixed on the shaft. Flywheel 3 is attached to the crankshaft flange with seven bolts.

Fig.3. Flywheel of the K7M engine of Renault Logan cars

1 - ring for the crankshaft position sensor; 2 - ring for starting the engine

The Renault Logan engine is equipped with a flywheel, which is cast from cast iron and has a pressed steel crown for starting the engine with a starter. In addition, the flywheel has a gear ring for the crankshaft position sensor.

The connecting rods are steel, I-section, processed together with the caps. The covers are attached to the connecting rods with special bolts and nuts.

The piston pin is steel, tubular in section. The pin, pressed into the upper head of the connecting rod, rotates freely in the piston bosses.

The Renault Logan (K7M) engine piston is made of aluminum alloy. The piston skirt has a complex shape: barrel-shaped in the longitudinal section, oval in the transverse section.

In the upper part of the piston there are three grooves machined for piston rings 4. The two upper piston rings are compression rings, and the lower one is oil scraper.

Fig.4. Renault Logan cylinder head

1 - cylinder head mounting screw; 2 - camshaft support; 3 - valve spring; 4 - spring plate; 5 - crackers; 6 - lock nut; 7 - adjusting screw; 8 - bracket; 9 - camshaft pulley; 10 - valve rocker arm; 11 - bolt securing the valve rocker arm axis; 12 - axis of valve rocker arms; 13 - camshaft thrust flange

The Renault Logan engine has a cylinder head made of aluminum alloy, which is common to all four cylinders. It is centered on the block with two bushings and secured with ten screws.

A non-shrinking metal gasket is installed between the block and the head. There are five camshaft supports (bearings) located at the top of the cylinder head.

The supports are made one-piece, and the camshaft is inserted into them from the timing drive side. The camshaft is driven by a toothed belt from the crankshaft.

In the outermost support journal of the camshaft (flywheel side) of the Renault Logan engine there is a groove into which a thrust flange fits, preventing axial movement of the shaft.

The thrust flange is attached to the cylinder head with two screws. The valve rocker axis is attached to the camshaft supports with five bolts. The rocker arms are kept from moving along the axis by two brackets, which are secured with bolts securing the rocker arm axis.

Screws are screwed into the rocker arms, which serve to adjust the thermal clearances in the valve drive 5. The adjusting screws are prevented from being loosened by locknuts.

The valve seats and valve guides of Renault Logan engines are pressed into the cylinder head. Oil deflector caps are placed on top of the valve guides.

The valves are steel, located in two rows, inclined to the plane passing through the cylinder axes. At the front (along the direction of the car) there is a row of exhaust valves, and at the rear there is a row of intake valves. The intake valve plate is larger than the exhaust valve.

The valve is opened by a rocker arm, one end of which rests on the camshaft cam, and the other, through an adjusting screw, on the end of the valve stem.

The K7M Renault Logan engine valve closes under the action of a spring. Its lower end rests on the washer, and its upper end rests on a plate, which is held in place by two crackers.

The folded crackers have the shape of a truncated cone on the outside, and on the inside they are equipped with persistent flanges that fit into the groove on the valve stem.

Fig.5. Renault Logan engine oil pump

1 - driven drive sprocket; 2 - pump housing; 3 - pump housing cover with oil receiver

Renault Logan engine lubrication is combined. The main and connecting rod bearings of the crankshaft and the camshaft bearings are lubricated under pressure. Other engine components are splash lubricated.

The pressure in the lubrication system is created by a gear oil pump located at the front of the oil pan and attached to the cylinder block. The oil pump is driven by a chain drive from the crankshaft.

Fig.6. Oil pump drive Renault Logan

1 - auxiliary drive pulley; 2 - front cover of the cylinder block; 3 - pump drive drive sprocket; 4 - drive chain; 5 - oil pump; 6 - crankshaft; 7 - cylinder block

The pump drive sprocket is mounted on the crankshaft under the front cover of the cylinder block. The sprocket has a cylindrical belt along which the front crankshaft oil seal operates. The sprocket is installed on the crankshaft without tension and is not secured with a key.

When assembling the Renault Logan engine, the pump drive drive sprocket is clamped between the timing belt pulley and the crankshaft shoulder as a result of the package of parts being tightened with a bolt securing the auxiliary drive pulley.

Torque from the crankshaft is transmitted to the sprocket only due to the friction forces between the end surfaces of the sprocket, toothed pulley and crankshaft.

The K7M engine oil receiver is made integral with the oil pump housing cover. The cover is secured with five screws to the pump body. The pressure reducing valve is located in the pump housing cover and is kept from falling out by a spring retainer.

Oil from the pump passes through the oil filter and enters the oil line in the cylinder block. The oil filter is full-flow, non-separable.

From the line, oil flows to the crankshaft main bearings and then, through channels in the crankshaft, to the connecting rod bearings. Through a vertical channel in the cylinder block of the Renault Logan engine, oil from the line is supplied to the cylinder head - to the middle support of the camshaft.

In the middle support journal of the camshaft there is an annular groove through which oil passes to the hollow bolt securing the rocker arm axis.

The rocker arms have holes through which oil is sprayed onto the camshaft cams. From the cylinder head, oil flows through vertical channels into the crankcase pan of the K7M engine.

The crankcase ventilation system is closed, forced, with gas selection through an oil separator (in the cylinder head cover), which cleans crankcase gases from oil particles.

Gases from the lower part of the crankcase enter through the internal channels in the cylinder head into the head cover and then, through two hoses (the main circuit and the idle circuit) enter the intake manifold of the Renault Logan engine.

Through the main circuit hose, crankcase gases are discharged at partial and full load modes into the space in front of the throttle valve.

Through the idle circuit hose, crankcase gases are diverted into the space behind the throttle valve both in partial and full load modes, and in idle mode.

Renault Logan, aka Nissan Aprio, Renault Tondar 90, Nissan NP200, Lada Largus and Renault Symbol are cars of the same group, built on the basis of the Romanian model Dacia Logan. The car was born in 2004 and was equipped with various power units throughout its production life.

The Renault Logan engine, which is used to complete the car, is mainly determined by the solvency of the market to which the car is supplied, as well as the requirements for the quality of the fuel being filled.

The Renault Logan K series gasoline engine, installed on Russian-made cars, is a modified design of a very outdated engine that has been installed on production cars since the mid-80s. The K7M engine, unlike its E-series ancestor, has an overhead camshaft driving 8 valves.

With this modification, the Renault Logan engine design was brought to a more modern level, unlike the previous generation, when the valve control shaft was located at the bottom of the cylinder block. The Logan 8-valve internal combustion engine has several versions, but the technical characteristics of the Logan engine are far from perfect.

The Renault Logan 1.6 engine in its single-shaft version can develop a maximum power of 98 hp. The K7M engine is quite versatile in terms of environmental characteristics, and although it is currently produced according to Euro 5 standards, having higher technical characteristics, it is also produced according to the entire range of requirements from Euro 1 to Euro 4.

The Renault Logan 1.6 8 valve power unit has limited possibilities for improvement. In order for the engine characteristics to meet the requirements for environmental friendliness, power, and fuel consumption, the cylinder head was modified and two camshafts were installed. This engine received the design index K4M. The technical characteristics of this engine indicate the possibility of developing a power of 113 hp. at 5500 rpm.

Engine K7M

The Logan K7M engine has 12 (14) versions. The differences are expressed in maximum power and the type of fuel used. Maximum power varies from 74 to 98 hp, with maximum speeds ranging from 5000 to 5500. Gasoline, gas, ethanol can be used as fuel.

Structurally, the 1.6 engine is made according to the L4 SOHC scheme. Number of valves - 8. Electronically controlled injection fuel supply system.

There are no cars on the Russian market whose engines are configured to run on liquefied gas or ethanol. Until 2010, the K7M 710 engine was standardly installed on the Renault Logan. In 2011, the K7M 800 series engines began to be installed on cars. The technical characteristics of the new line of engines were somewhat suppressed to suit Euro4 requirements.

Due to the reconfiguration of the injection system and the operation of the catalytic converter, the engines lost 3 hp. and now develop only 83 horses at 5250 rpm, while developing a torque of 130-135 Nm within the rev range from 2500 to 5500. Peak torque is achieved at 4700-4800 rpm.

The K7MF710 motor is supplied as an option and as a spare part, having the letter index F. indicating the ability to operate on both gasoline and ethanol. Officially, such engines were not installed on cars intended for the Russian market.

The valve control design is based on the use of rocker arm pushers, which increases the number of parts used and, accordingly, reduces the reliability of this unit. The intake and exhaust valves are located on both sides relative to the engine axis. The camshaft is driven by a belt drive from the crankshaft. The rotation speed ratio is 1 to 2.

If the valve belt breaks, it may bend. The description of the CPG indicates the presence of a single recess in the bottom of the piston, but its depth is not enough. The valve may be bent if the valve hangs fully open.

With timely maintenance and replacement of necessary structural elements, the engine life is 400,000 km before the first major overhaul.

Engine K4M

Renault Logan is also equipped with 16 valve engines. Cars leave the factory equipped with K4M power units. This type of engine is a continuation of the development of the K7 family. The main design difference is the DOHC design of the engine. Two camshafts are used, mounted in a modified valve head.

The design is traditional, and the design solution made it possible to avoid using rocker arms as pushers. The force is transmitted directly from the camshaft lobes to the valve stem. The technical characteristics of the engine make it possible to obtain 113-115 hp, but a feature of this version of the power plant is the presence of a pronounced peak torque value.

The dependence of torque on speed is almost linear with an increase to 160 Nm at 4500 rpm and a subsequent decrease to 135 Nm at 7000 rpm. The engine is quite revvy. Maximum power is produced at 6800 rpm.

For the Russian version of the Renault Logan, the K4M engine is supplied with index 490. The same type of power plant is installed in the Lada Largus. To answer the question of whether the valves bend on this type of engine, it is necessary to turn to the design on the basis of which this engine was designed.

The resource of the K4M power plant is 400,000 km, like its predecessor. The indicators set by the manufacturer are confirmed under real operating conditions.

Fuel system

The fuel system of both types of units is injection. The engines are designed for operation on 95 gasoline. The use of fuel with an octane number of 92 is acceptable, but not justified, since fuel consumption increases and engine power characteristics decrease.

Oil system

Structurally made the same. The system pressure is generated by a gear oil pump mounted at the bottom of the engine. Oil is taken from the crankcase and supplied to the system under pressure. The cylinder mirrors are lubricated by oil mist (bubbling), which is created when the crankshaft rotates. Forced irrigation of the lower part of the cylinders using oil nozzles is not provided.

Engine oil for Renault Logan is selected based on operating conditions. Which oil to use as a base is absolutely not important. Since the power units are designed on the basis of engines of the 80s, all construction materials and, in general, all engine reliability require the use of mineral, semi-synthetic and fully synthetic oils.

However, the manufacturer indicates the use of mainly mineral water and semi-synthetics as the most economically justified options for liquid lubricants. Engines are not so picky as to run exclusively on modern synthetic oils. For the first time, Elf 5w30 all-season semi-synthetic oil is filled at the factory.

What kind of oil to pour then during operation depends on the technical condition and mileage of the engine, as well as temperature operating conditions. The most universal oil for Renault Logan is a lubricant with a viscosity of 5w40 and 5w50, which ensures normal engine operation in all climatic zones.

Main malfunctions and operational problems

Some malfunctions, such as engine tripping or engine vibration, are primarily caused by the spark plugs. Spark plugs have a limited resource and require timely replacement.

Due to the fact that this consumable element for controlling the ignition system is often counterfeited and, in principle, has a limited number of quality suppliers, the spark plugs should either be changed during maintenance at certified stations, or purchased spark plugs from authorized dealers.

Another common malfunction is a burnt-out cylinder head gasket. The problem is related to insufficient cooling of the block head. This is especially true on 16 valve engines.

A broken timing belt causes the valves to bend. Therefore, it is necessary to replace the belt drive and rollers every 60,000 km.

The design of power units is not complicated. If you have sufficient skills, you can repair the engine yourself. When replacing the timing belt on a 16-valve unit, it should be taken into account that there are no marks for aligning the shafts on the front of the engine.

If the top dead center of the piston can be determined by unscrewing the spark plugs and turning the crankshaft, followed by fixing it with a bolt through a special hole, then the camshafts are set according to the marks located in the rear of the head and closed with plugs. The shafts also have the ability to be fixed with special inserts.

Possibility of tuning and modifications

Renault has its own tuned K4M RS engine, developing 133 hp. Renault Logan does not have such an engine installed at the factory. If you do not plan to replace camshafts or deeply modernize the cylinder head, then tuning a Renault engine is usually done by flashing the engine management system. This allows you to increase the power of a standard 16 valve engine from 109 to 120 hp.

Installing a turbine supercharger is possible, but will lead to a reduction in engine life.

Front view of the engine and its components: 1 - air conditioning compressor; 2 - drive belt; 3 - generator; 4 - power steering pump; 5 - oil dipstick (level indicator); 6 - cylinder head cover; 7 - ignition coil; 8 - spark plugs; 9 - cylinder head; 10 - thermostat housing; 11 - exhaust manifold; 12 - coolant pump pipe; 13 - oxygen concentration sensor; 14 - oil pressure sensor; 15 - technological plug; 16 - flywheel; 17 - cylinder block; 18 - oil pan; 19 - oil filter

Rear view of the engine: 1 - gearbox; 2 - crankshaft position sensor; 3 - inlet pipeline; 4 - absolute air pressure sensor; 5 - intake air temperature sensor; 6 - throttle assembly; 7 - idle speed regulator; 8 - oil filler cap; 9 - fuel rail; 10 - oil dipstick (level indicator); 11 - cylinder head; 12 - cylinder block; 13 - drive belt; 14 - oil pan; 15 - knock sensor; 16 - support bracket for the intake pipeline; 17 - starter; 18 - speed sensor

View of the engine on the right: 1 - drive belt; 2 - drive pulley; 3 - guide tube of the oil level indicator, 4 - support bracket for the intake pipeline; 5 - lower timing belt cover; 6 - inlet pipeline; 7 - throttle assembly; 8 - upper timing belt cover; 9 - oil filler cap; 10 - ignition coil; 11 - power steering pump pulley; 12 - generator 13 - support roller; 14 - tensioner roller; 15 - air conditioning compressor pulley; 16 - oil pan

View of the engine on the left: 1 - gearbox; 2 - air conditioning compressor; 3 - oxygen concentration sensor; 4 - generator; 5 - thermostat housing; 6 - coolant temperature sensor; 7 - cylinder head; 8 - cylinder head cover; 9 - ignition coil; 10 - oil filler neck; 11 - fuel rail; 12 - throttle position sensor; 13 - throttle assembly; 14 - inlet pipeline; 15 - intake air temperature sensor; 16 - absolute air pressure sensor in the intake manifold; 17 - cylinder block; 18 - crankshaft position sensor; 19 - vehicle speed sensor

Engine flywheel: 1 - ring for the crankshaft position sensor; 2 - ring for starting the engine

Cylinder head - Cylinder head (the cover is removed in the photo): 1 - cylinder head mounting screw; 2 - camshaft support; 3 - valve spring; 4 - spring plate; 5 - crackers; 6 - lock nut; 7 - adjusting screw; 8 - bracket; 9 - camshaft pulley; 10 - valve rocker arm; 11 - bolt securing the valve rocker arm axis; 12 - axis of valve rocker arms; 13 - the thrust flange of the camshaft, pressed into the upper head of the connecting rod, rotates freely in the piston bosses.

Engine Specifications

The technical characteristics of the engines are given in the table for the Renault Logan

Vehicle type	engine's type	Engine suffix	Working volume, cm 3	Cylinder diameter, mm	Piston stroke, mm	Compression ratio
LS0A LS0C LS0E LS0G
LS0B LSOD LSOF LS0H

Engine pistons made of aluminum alloy and have grooves for installing piston rings: two compression rings and one oil scraper ring. The oil scraper ring is equipped with an expansion spring - an expander. Each piston is equipped with a piston pin corresponding in size to the piston group and connecting rod group.

Connecting rods. The piston is attached to the connecting rod on the upper side using a piston pin. The lower side of the connecting rods is fixed to the crankshaft journals and rotates on connecting rod bearings (liners). The insert is a steel half-ring of a certain thickness with a locking protrusion. You can remove/install the liners by removing the connecting rod from the crankshaft, while removing the two bolts securing the connecting rod bearing cover. Connecting rods and their caps are manufactured in a single technological process and are not interchangeable. Each connecting rod and cap are numbered and marked with an electric pencil to prevent incorrect installation.

Crankshaft made of cast iron and has eight balancers (counterweights). The crankshaft rotates in five main bearings. Each main bearing consists of two steel shells of a certain size and is equipped with an oil hole, an oil guide groove and a locking lug.

Cylinder head and camshaft. The camshaft is synchronized with the crankshaft speed in a ratio of 1x2 and rotates using a toothed belt. The camshaft controls eight valves through followers (pushrods) located opposite each valve under each camshaft lobe. Thermal clearances of the valves are compensated by gaskets installed between the pushers and valve stems. The camshaft is mounted on a “bed” at the top of the cylinder head and secured by five bearing caps. The valves are located in the cylinder head in special guides and are spring-loaded.

Lubrication system. Engine oil is pumped into the system by an oil pump, which is controlled by a gear located on the right side of the crankshaft. Oil from the crankcase enters the pump through a metal sieve and is then forced into the oil filter located on the outside of the cylinder block. From there, the oil flows to the main bearings, crankshaft and camshaft. The crankshaft main bearings are supplied with oil through holes drilled in the crankshaft body. The camshaft and other components, and elements of the cylinder head, as well as engine components and assemblies, are lubricated with oil through special channels.

Replacing expensive engine parts

Before replacing camshafts or other expensive engine parts due to damage, consult a qualified technician. In the case of camshafts, it may be possible to repair them, and it will cost less than buying a new camshaft. If the bearing surfaces of the crankcase and holders are damaged, they may need to be bored out and special spacers installed. Since the cost of new components will be quite high, it is better to consider all possible alternative options.

Commissioning after engine overhaul

1. Make sure the engine oil and coolant levels are correct
2. Make sure there is enough fuel in the tank.
3. Start the engine and let it idle at a moderately high speed until it reaches normal operating temperature.
4. Check the system thoroughly for engine oil and coolant leaks and ensure that the transmission and all controls, especially the brakes, are operating properly before road testing. After completing the road test and after the engine has completely cooled, check the engine oil and coolant levels.

1. Use gentle operation for the first few kilometers to ensure that the oil circulates properly through the engine and that the newly installed parts seat properly.
2. You need to be even more careful if the engine has undergone extensive overhaul, in which case you will need to use the car as if it were new. This means using the gearbox more often and using the throttle sparingly, at least for the first 1000 km. You should not adhere to a certain speed limit; the main thing is to prevent significant load when the engine is running, and gradually increase its technical characteristics.
These recommendations apply to a lesser extent to those cars on which the overhaul was partially carried out, although, by and large, it all depends on the type of work that was performed, as well as on the components that were to be replaced. Experience is the best guide as you can easily determine if the engine is working properly. If in doubt, consult your authorized dealer.
3. If you suspect that the lubrication system is faulty, turn off the engine and try to determine the cause. Running the engine without oil, even for a short period of time, can cause serious damage.

Warning for working on the engine

Prolonged and regular contact of motor oil with your skin destroys its natural protection. Prolonged contact of engine oil with the skin may cause the skin to dry out. If motor oil gets inside, do not try to induce vomiting. See your doctor.
Used oil may contain harmful contaminants that can cause skin cancer. Always use special protective equipment when working. Thoroughly wash your hands and other areas of skin that come into contact with motor oils.
Observe the following safety precautions:
- Avoid prolonged and regular contact with motor oils and other petroleum products.
- Wear impervious protective gloves.
- Do not put oily rags in the pockets of overalls.
- Do not wear protective clothing contaminated with petroleum products. Workwear must be washed regularly in special detergents.
- Do not wear shoes stained with petroleum products.
- If you get injured, immediately wash the wound and cover it with an antibacterial plaster. Secure the patch with a bandage. If the wound is serious, seek first aid.
- Use special compounds to protect the skin. Apply the composition to clean skin
before each working day. At the end of the work, wash off the protective composition along with dirt and oil products.
- Wash off oil products and dirt from your face and hands using “72%” laundry soap or special cleaners.
- Do not use gasoline, kerosene, diesel fuel or solvents to remove petroleum residues from your skin.
- If you notice any changes on the surface of the skin, consult a doctor immediately.
- Before work, it is advisable to clean (rinse) the working surfaces and internal cavities of components and assemblies.
- If there is a risk of oil or petroleum products splashing into your eyes, use safety glasses, visors or face masks.

Engine Renault Logan\Sandero 1.4 l K7J 710

Engine characteristics Renault Logan 1.4

About production – Bursa plant
Brand\Engine type Renault Logan - K7J
Years of production – (2004 – our time)
Cylinder block material – cast iron
Power supply system - injector
Type – in-line
Number of cylinders – 4
Valves per cylinder – 2
Piston stroke – 70 mm
Cylinder diameter – 79.5 mm
Compression ratio – 9.5
Logan engine capacity is 1390 cm3.
Renault Logan engine power – 75 hp. /5500 rpm
Torque – 112 Nm/3000 rpm
Fuel – 92
Environmental standards – Euro 3
Fuel consumption - city 9.4 l. | track 5.5 l. | mixed 6.9 l/100 km
Oil consumption – up to 0.5 l/1000 km
Engine oil for Logan 1.4:
5W-40
5W-30
Oil changes are carried out every 7500 km (In urban conditions)
Once every 15,000 km (In heavenly conditions)

Renault Logan resource:
1. According to the plant – 400 thousand (unofficially, factory tests)
2. In practice – 400+ thousand km

TUNING
Potential – unknown
Without loss of resource - unknown

The engine was installed on:
Renault Logan
Renault Sandero

Renault Logan 1.4 engine malfunctions and repairs

Engine Renault Logan K7J 710 1.4 l. 75 hp represents an evolution of the old ExJ motors developed in the 80s. Structurally, the Dacia Logan engine has a strange and rather archaic design; it still uses timing rocker arms and a strange oil pump drive system inherited from the K7J 710 engine from the lower engine ancestors of the 60s. Despite this, with proper running-in (spinning no higher than 3-3.5 thousand rpm, speed no higher than 130 km/h during the first 1000 km), timely maintenance, the engine is very reliable, the service life of the Logan in factory tests was more than 400 thousand km, but how long does it run in practice? There are examples with even higher mileage, the service life is excellent! The popularity of cars with this engine among taxi drivers is further confirmation of this.
The disadvantages of the K7J engine include high fuel consumption. Often at idle the speed starts to fluctuate. The Renault Logan 1.4 engine does not have hydraulic compensators, so the valves need to be adjusted every 20-30 thousand km. The timing belt is driven by a belt; if the belt breaks, the Logan bends the valve; to protect itself from this, the belt needs to be changed every 60 thousand km. In addition, the crankshaft oil seal often leaks, the engine itself is noisy and does not go anywhere at all on the highway. There is a more powerful and voluminous version of this motor - K7M, when choosing a car with these engines, pay attention to the K7M.
Recommended for: taxi drivers, the calmest drivers in the world, women.
Not recommended for: young people, fans of aggressive driving style.

Disadvantages of the Dacia/Renault Logan engine

Let's start with not exactly a drawback, but a question that worries the public: warming up the engine and does it need to be warmed up? The instructions say, sit down and go, but in practice the oil becomes more viscous and flows worse to the rubbing pairs; it wouldn’t hurt to let the engine run for a minute until it idle smoothly.
Let's move directly to the malfunctions, often owners are faced with unstable operation of the Renault Logan engine or it completely stalls, the problem is most likely in the IAC (Idle Air Controller), perhaps the fuel pump filter mesh is clogged or the fuel filter has arrived, maybe the DPKV (Crankshaft Position Sensor) or the coil ignition
If it stalls while driving, while the engine is fully warmed up, look for air pockets in the cooling system.
The next malfunction is the Logan engine overheating or, vice versa, it does not heat up. The problem is most often in the thermostat. In case of overheating, the causes may include a malfunction of the water pump or a blockage in the channels of the cooling system or radiator. Perhaps you overloaded the engine, carbon deposits in the combustion chamber or high compression.
The third type of malfunction: knocking and noise in the Renault Logan engine, what is the reason? The cause may be valves that require adjustment of the gaps, a clear metallic sound is emanating, the cause can be solved by visiting a service center and adjusting the valves. Main and connecting rod bearings, pistons and piston pins can knock. In all cases, you need to deliver the car for service and resolve the issue as soon as possible, otherwise the consequences will hit your pocket.
Do you feel the vibration of the Renault Logan engine? The most common cause is wear of the engine mount; in addition, other causes include crankshaft imbalance, different compression in the cylinders, or a loose crankshaft pulley.
Well, a popular problem, your Logan engine is not working, what to do, what to blame, who to blame... The reasons are simple, they simply filled in bad gasoline or the ignition coil, no? We look at the high-voltage wires, spark plugs, and fuel pump.

Engine number Renault Logan 1.4 / 1.6 (K7J/K7M)

The number is located next to the oil pressure sensor, on the rear of the cylinder block, on the left.

Engine tuning Renault Logan 1.4 K7J 710

The K7J engine was initially developed using outdated technologies with an eye on resource, reliability and the sporting component was not considered in principle. In addition, after modifying the engine, the main trump card is lost - reliability. At the same time, any dynamics are not acquired, a similar VAZ will be faster... there is no point in tuning. For the stubborn, let's continue...Let's consider several options for tuning this engine:

Chip tuning, Renault Logan 1.4 engine firmware

Tuning companies offer firmware with an increase in power by as much as 7-9 hp. Naturally, flashing the naturally aspirated engine will not give anything and the entire increase will remain at the level of self-hypnosis, but fuel consumption will increase.
There is an opinion that if you remove the catalyst on the Logan and flash it, the car will fly... you'll be wasting your time, it won't do any good, the car won't move.

Compressor for Renault Logan 1.4

The easiest, fastest and most reliable way to install a compressor is to buy a ready-made kit. There are not so many whales in nature for Logan motors, but there are still companies ready to sell a ready-made kit. One of the most famous such companies is the St. Petersburg company Auto Turbo, popular (among pelvis manufacturers), you can order a kit based on the PC-23-1 from them with a pressure of 0.5 bar, a standard piston engine will fit without modifications and will inflate in the region of 90-100 forces. A more productive PC-23 with a pressure of 0.7 bar will ask for a reduction in the compression ratio, we will reduce it by installing a thick cylinder head gasket or two gaskets, the piston may need to be modified/replaced. Both compressors will require more efficient Volga BOSCH 107 injectors, exhaust modification and online tuning. If you have a budget of 1/4 of the cost of the car, you can personally assemble a compressor based on the Toyota SC14 from Mark, but the list of additional parts will stretch for several pages. One way or another, you won’t get any extra power.
Will a compressor reduce the life of a K7J engine?? Of course it will reduce, but tuners don’t care much about that))

Turbine for Renault Logan 1.4

We do the same as with the compressor, BOSCH 107 injectors, cylinder head gasket, intercooler (from Evolution, for example), exhaust on a 51 mm pipe, pipes, consumables, the IHI RHB3 turbine itself or similar. Now this pile of iron needs to be configured, for this you need to make connections between the motor and the January ECU, it will not be easy, but it is completely achievable. At the output, this kit will produce +\- 100 hp.

Purchase and installation of 1.6 l. 16V

Ideal tuning of a 1.4 liter engine, we buy a good engine that runs initially K4M and do a swap. We avoid fussing with supercharging, loss of service life and regular repairs after a good Valilov))