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.

Renault Logan engine with auxiliary units (front view along the vehicle):
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

Renault Logan cars are equipped with K7J and K7M engines. Both engines are identical in design and differ only in displacement. The K7J engine has a displacement of 1.4 L, and the K7M engine has a displacement of 1.6 L. The increase in displacement is obtained due to the larger radius of the crankshaft crank and, consequently, a larger piston stroke.
Both engines are gasoline, four-stroke, four-cylinder, in-line, eight-valve, overhead camshaft.

The operating order of the cylinders is: 1–3–4–2, counting from the flywheel.

Power supply system - distributed fuel injection (Euro-2 toxicity standards).
The engine, gearbox and clutch form the power unit - a single unit mounted in the engine compartment on three elastic rubber-metal supports. 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 engine cylinder block is cast from cast iron, the cylinders are bored directly into the block. The nominal diameter of the cylinder is 79.5 mm.

Renault Logan engine (rear view along the car):
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

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 for the 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.

Renault Logan power unit (view from the right as the car moves):
1 - auxiliary drive belt;
2 - auxiliary drive pulley;
3 - guide tube of the oil level indicator;
4 - support bracket for the intake pipeline;
5 - lower cover of the timing belt;
6 - inlet pipeline;
7 - throttle assembly;
8 - upper cover of the timing belt;
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

The crankshaft main and connecting rod bearing shells are made of 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 cast integrally with it. To supply oil from the main journals to the connecting rods, there are channels whose outlet holes are closed with plugs. At the front end (toe) of the crankshaft there 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.

Renault Logan power unit (view from the left as the car moves):
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

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

The flywheel is attached to the crankshaft flange with seven bolts. It 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 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. The two upper piston rings are compression rings, and the lower one is oil scraper.

Renault Logan cylinder head (head cover removed):
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 cylinder head is made of aluminum alloy, 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 outer support journal of the camshaft (from the flywheel side) 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 guides 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 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 thrust flanges that fit into the groove on the valve stem

Oil pump Renault Logan:
1 - driven drive sprocket;
2 - pump housing;
3 - pump housing cover with oil receiver

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.

Renault Logan oil pump drive (sump pan removed):
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 interference and is not secured with a key. When assembling the engine, the pump drive drive sprocket is clamped between the timing pulley and the crankshaft shoulder as a result of the package of parts being tightened with the auxiliary drive pulley bolt. 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.

If the accessory drive pulley bolt is loosened, the oil pump drive sprocket may begin to rotate on the crankshaft and the oil pressure in the engine will drop.

The 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 main bearings of the crankshaft and then, through channels in the crankshaft, to the connecting rod bearings. Through a vertical channel in the cylinder block, 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. Next, the oil, through a hollow bolt, enters a channel made in the rocker arm axis, and from there to the rocker arms and through other hollow axle mounting bolts to the remaining camshaft supports. The rocker arms have holes through which oil is sprayed onto the camshaft lobes. From the cylinder head, oil flows through vertical channels into the engine sump.
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 engine intake manifold.
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.
Control, power, cooling and exhaust systems are described in the relevant chapters.

Renault Logan engine 1.6 8 valves is essentially a modification of the 1.4 liter engine. The working volume of the Renault Logan 1.6 power unit was increased due to a new crankshaft and the height of the cylinder block, which increased the piston stroke from 70 to 80.6 mm. All other engine parts remain the same. The increase in displacement led to an increase in power from 75 to 87 horsepower. However, now the manufacturer indicates only 82 hp. there is no mistake in this. It’s just that the first Logan 1.6 engines corresponded to the EURO-2 environmental class, and the current version of EURO-5, as a result of reconfiguring the exhaust toxicity, the power dropped to 82 horses.

Read more about the design of the Renault Logan 1.6 8 valve engine.

Engine design Renault Logan 1.6 8V

On Renault Logan and Sandero cars, this engine has the name Renault K7M 1.6 8V. The engine has been installed on budget sedans since 2005. The cylinder block is made of cast iron, the block head is cast from an aluminum alloy. The gas distribution mechanism has one camshaft and 8 valves. 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 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. The two upper piston rings are compression rings, and the lower one is oil scraper.

Detailed description of the cylinder head design -

• 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 - valve rocker axis
• 13 - camshaft thrust flange

Cylinder head of Renault Logan 1.6 engine- made of aluminum alloy, 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 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.

As for the thermal clearance of the valves, there are no hydraulic compensators. Therefore, it is necessary to periodically adjust the valve clearance of the Logan 1.6 engine.

Replacing the timing belt of the Renault Logan 1.6 engine

When the timing belt breaks, the valves on this engine bend, so this process must be carried out on time and with special attention. Further details instructions for replacing the timing belt Renault Logan 1.6

Timing drive device for Renault Logan 1.6 engine

• 1 - crankshaft toothed pulley
• 2 - camshaft gear pulley
• 3 - timing belt
• 4 - tension roller
• 5 - coolant pump toothed pulley

The procedure for replacing the timing belt on this engine is as follows -
We unscrew the six bolts securing the upper timing belt cover, then remove the upper timing belt cover. Unscrew the bolts securing the lower timing belt cover and remove it. Using a 18mm socket, unscrew the crankshaft pulley mounting bolt, then remove the pulley. Now it is necessary, without removing the belt, to rotate the camshaft pulley until the marks on the cylinder head and the camshaft pulley align, as shown in the photo.

Now it is necessary to block the crankshaft in the TDC position of the pistons of the 1st and 4th cylinders. For this purpose, in the cylinder block of the Logan 1.6 engine there is a special technological plug under the emergency oil pressure indicator sensor (next to the first cylinder). We unscrew the plug and screw in a special bolt with a long thread of at least 75 mm; this will not allow turning the crankshaft clockwise.

Now, without turning the crankshaft, unscrew the timing belt tensioner roller and remove the belt. When replacing a belt, the roller must be changed. When installing a new belt, a special wrench is required to tension the timing pulley (suitable for Lada models). After you have installed the new belt, you need to check it for tension. Look at the next photo.

If you can twist the belt by more than 60-70 degrees using your thumb and index finger, it means the belt is loose and needs to be tightened further. Check the belt tension in the place between the camshaft pulley and the coolant pump. Further characteristics of the 1.6 Logan engine

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

With timely replacement of oil, timing belt and proper valve adjustment Renault Logan 1.6 engine can last a long time. The engine resource is long, which is due to the simplicity and reliability of the design of this motor.

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))

The 1.4-liter Renault Logan family engine is quite popular in the secondary market due to its qualities.

Engine characteristics 1.4

This unit has the factory index K7J, is gasoline and the first in the line. The remaining 1.6-liter power units are only further improvements in the design of this engine by increasing the piston stroke and. This unit is produced in Romania at the Dacia plant and is a logical continuation, in its design, of the line of engines of the French manufacturer of the 80s. By its design, it is a classic engine for its segment:

• the power unit has 4 cylinders and 8 valves, that is, 2 valves per cylinder, the cylinder arrangement is vertical, in-line;
• carried out from the toothed belt.

Power characteristics are as follows: maximum power of 75 horsepower is achieved at 5000 crankshaft revolutions per minute, and torque is a modest 100 Newton meters.

The declared resource of the unit is 200,000 kilometers, but many motorists easily managed to overcome this mark. There are known cases of reaching a mileage of 400,000 kilometers without major repairs.

The dynamic indicators of this one are quite modest: acceleration to 100 km/h is a long 13 seconds, which is quite slow for a passenger car, and the maximum speed reaches 164 km/h, which is also a modest indicator and characterizes the low power of the unit.

This is due to a torque of only 115 Newton meters, due to the rather archaic design of the 1.4 unit. However, the low dynamics are compensated by moderate fuel consumption for this modification and its model year and good indicators of engine reliability and service life.

Advantages of the 1.4 engine

The main advantages of the Renault Logan 1.4 unit include:

1. High maintainability of main components and parts. This is due to the simplicity of the design, the availability of spare parts and ease of repair. Since the power unit was designed in the 90s, it does not have complex electronic systems or complex solutions, so in many cases repairs can be made by the car owner himself.
2. Maintenance, due to the simplicity of the design, is carried out by carrying out basic procedures that do not require special knowledge and skills. In this way, this Renault Logan engine differs favorably from many modern “brothers”, where the complex design will not allow the owner to carry out independent maintenance outside of service.
3. Good traction capabilities of Renault Logan at low speeds. This indicator is called engine elasticity 1.4. This engine pulls well from low speeds, which in urban conditions creates more advantages and contributes to comfortable driving.
4. High service life of the main components and the structure as a whole. Based on practical experience, many car owners were able to overcome the lifespan of the 1.4 engine declared by the factory without much difficulty. The great popularity of Renault Logan in taxi companies is only confirmation of this. On the roads you can find cars from the first years of production that have traveled more than 400,000 kilometers without major repairs or serious intervention in the design.

Disadvantages of the 1.4 engine

Disadvantages and most common malfunctions of the 1.4 motor:

1. Imperfection of individual components and assemblies, leading to certain difficulties in the future. This is caused by the archaic nature of the design and, if during maintenance this factor is a positive feature, then when breakdowns occur it is already considered a disadvantage.
2. When the timing belt breaks, damage to the engine valves occurs due to a collision with the pistons. This drawback is caused by the design of the pistons and the entire system and is a fairly significant drawback, since replacing the valves will require significant financial costs from the owner.
3. Often, when the engine is idling, vibrations occur and the engine shakes. This is also caused by non-optimal fastening of the unit inside the engine compartment and the operating characteristics of the engine. This deficiency can also cause unstable idle speed. You can eliminate the situation when the engine is shaking and vibrations in car services by adjusting the engine and replacing its cushions (supports).
4. Compared to modern engines, fuel consumption is quite high. Yes, in the 90s, consumption per 100 km/h in the combined cycle of around 8 liters was quite economical for a gasoline engine, but now this is unreasonably high, given the modest engine power.
5. The lack of engine hydraulic compensators also entails adjusting the valves every 15,000 kilometers, which leads to additional financial costs for servicing the resource.
6. Presence of high acoustic noise. When developing this Renault Logan engine, acoustic comfort was the last thing we thought about, and thus the engine turned out to be very noisy.