Engine Nissan MR20DE

Content

History of the Nissan MR20DE engine
Technical specifications
Engine Reliability
List of the most common faults and methods for their elimination
What oil is best to fill in the engine
Which cars are equipped with the MR20DE engine

Back in 1933, two well-known corporations merged: Tobato Imono and Nihon Sangyo. It is not worth going into details, but a year later the official name of the new brainchild was presented - Nissan Motor Co., Ltd.

And almost immediately the company starts supplying Datsun cars. As the founders said, these cars were created exclusively for Japan.

Years later, the Nissan brand is one of the leaders in the design and sale of cars. The well-known Japanese quality is clearly expressed in each copy, in each new model.

History of the Nissan MR20DE engine

The power units of the Nissan company (the country of Japan) deserve separate words. These are engines with a long service life, are quite economical, comply with generally accepted environmental standards, and are inexpensive to maintain and repair.

Large-scale production of MR20DE motors began in 2004, but some sources claim that 2005 will be a more accurate figure. For a long 13 years, the production of units has not been stopped, and today continues to function properly. According to numerous tests, the MR20DE engine firmly occupies the fifth position in terms of reliability throughout the world.

Installation sequence for various company models:

Nissan Lafesta. A classic, comfortable minivan that saw the world in 2004. The two-liter engine has become an ideal unit for the body, the length of which was almost 5 meters (4495 mm).
Nissan A model quite similar to the previous representative. Nissan Serena is a minivan, the configuration of which included the installation of both rear-wheel drive and all-wheel drive.
Nissan bluebird. The car, which began production in 1984 and received a lot of changes from 1984 to 2005. In 2005, the MR20DE engine was installed on sedan bodies.
Nissan Qashqai. Which was presented to society in 2004, and only in 2006 began its mass production. The MR20DE engine, with a volume of 0 liters, has become the ideal basis for a car that is produced in various equipment and up to the present day.
Nissan X-trail. One of the most popular crossovers, which differs from models from other manufacturers in its compactness. The development of the Nissan X-trail was carried out back in 2000, but in 2003 the car had already received its first restyling.

Nissan MR20DE engine It can be said that the MR20DE engine, reviews of which are only positive, is a public property, since in addition to the above models, it was also installed on Renault cars (Clio, Laguna, Mégane). The unit has established itself as a reliable and durable engine, with rare malfunctions, mainly due to low-quality components.

Technical specifications

To understand all the capabilities of the engine, you should find out its technical characteristics, which are summarized in a table for greater ease of understanding.

Mark	MR20DE
engine's type	Inline
Working volume	1997 sm3
Engine power relative to rpm	133/5200 137/5200 140/5100 147/5600
Torque vs RPM	191/4400 196/4400 193/4800 210/4400
Number of cylinders	4
Number of valves	16 (4 per 1 cylinder)
Cylinder block, material	Aluminum
Bore	84 mm
Piston stroke	90.1 mm
Compression ratio	10.2
Recommended fuel octane	95
Fuel consumption:
- when driving in the city	11.1 liters per 100 km.
- when driving on the highway	7.3 liters per 100 km.
- with a mixed type of driving	8.7 liters per 100 km.
Engine oil volume	4.4 liters
Oil tolerance for waste	Up to 500 grams per 1000 km
Recommended engine oil	0W-30 5W-30 5W-40 10W-30 10W-40 10W-60 15W-40
Change of oil	After 15000 km
Working temperature	90 degrees
Environmental norm	Euro 4, quality catalyst

It should be clarified that with modern oil, it must be replaced more often. Not every 15000 km, but after 7500-8000 km. The grades of oil most suitable for the engine are indicated in the table.

There is also such an important parameter as the average service life, which is not indicated by the manufacturer regarding the MR20DE internal combustion engine. But, according to numerous reviews on the network, the operating time of this unit is at least 300 km, after which it becomes necessary to carry out a major overhaul.

The engine number is located on the cylinder block itself, so replacing it may be accompanied by some difficulties due to the registration of the unit. Nissan MR20DE engine The number is located below the protection installed on the exhaust manifold. A more accurate guide can be an oil level dipstick. When buying a used car, not all drivers immediately find it, as the number can be hidden under a layer of rust.

Engine Reliability

It is known that the MR20DE power unit has become a reliable replacement for the well-known QR20DE, which has been installed on cars since 2000. The MR20DE has a longer service life (overhaul only needs to be done after 300 km), as well as better draft properties.

Of the design features:

There are no hydraulic lifters. That is why, with the sudden occurrence of knocking, it is necessary to immediately adjust the valve clearances. Of course, the motor will work anyway, but it's best to spend a few washers, most often used for adjustment, and not reduce the life of the unit. A phase regulator is also installed on the intake shaft.
The presence of a timing chain. Which, on the one hand, is good, but on the other, it means there are additional problems. For example, with today's diversity of automotive parts manufacturers, it is very difficult to find true quality. Very often, a timing belt replacement may be required even after 20000 km.
Camshaft lobes and crankshaft journals. Such a constructive solution allows to reduce the internal resistance of the motor and improve both its draft and speed qualities.
The throttle is controlled by an electronic unit, and multi-point injection should also be highlighted.

Nissan MR20DE engine The list of the most common malfunctions for this motor is very small and includes such problems in which the driver can not only get to the house or service center, but also drive more than one hundred kilometers, a quick engine replacement is not required. Only if the control unit has not failed.

But, it should be remembered that this unit, the reliability of which is quite high, was created exclusively for a calm and measured ride. Tuning to enhance its technological qualities will not work. For example, even installing a turbine will lead to the need to digest the manifold, purchase a reinforced BPG, install a more powerful fuel pump, and many other improvements. After installing the turbine, the engine power will increase to 300 hp, but its resource will be significantly reduced.

List of the most common faults and methods for their elimination

As mentioned earlier, on an injection car with an MR20DE engine, there are practically no problems in which the driver cannot reach his destination or the nearest service station and an urgent system overhaul will be required. But still, you should prevent a malfunction in time, or, if it occurs, do not put off repairs indefinitely. Self-diagnosis is not always a good way out of the situation.

Float problem

It often occurs even on new cars, the mileage of which has just crossed the 50000 km mark. Floating speed is most pronounced at idle, and many car owners, without straining, immediately take the car to a minder or a repairman for injector systems. But do not rush, just remember the device of the MR20DE unit.

This engine is equipped with an electronic throttle, on the damper of which, over time, carbon deposits form. As a result - insufficient fuel supply and the effect of floating speed. The way out is the simple use of a special cleaning liquid, which is sold in convenient aerosol cans. It is enough to apply a thin layer of liquid on the throttle assembly, leave for a few minutes and wipe with a dry cloth. The manual has a detailed description of this operation.

Overheating of the motor

Nissan MR20DE engine The problem is frequent, due to insufficiently high-quality electronic components, and not to the fact that the cooling system has failed: a thermostat, a pump (the pump is extremely rarely replaced) or an idle speed sensor. Overheating the engine will not cause it to stop, the ECU will simply reduce the speed to a certain level, which will also cause a loss of power.

This happens due to the fact that the air flow sensors do not work correctly, or rather, the thermistor, which is part of them. Very often, the temperature sensor can increase the reading by exactly half, which the system perceives as overheating of the engine and forcibly reduces its speed. For high-quality and correct operation of the system, the thermistor must be replaced.

Increased oil consumption

Maslozhor many perceive as the onset of the moment when it is necessary to make an expensive overhaul of the engine. But you should not rush, as the reason for this may be piston rings or valve stem seals, the service life of which has come to an end. Then, in addition to increased oil consumption, deposits can also form on the inner surface of the cylinder or where the pistons are located. The compression ratio in the cylinders is reduced.

The characteristics indicate the permissible oil consumption for waste, but if the engine consumes oil much more, then measures should be taken. Replacing rings, a set of which is not too expensive, will require the involvement of specialists from a quality service station. Before replacing, it is necessary to perform such an operation as raskosovka - cleaning the piston rings from soot, and after that - check what compression is in the cylinders.

Timing chain stretch

Nissan MR20DE engine It can be confused with a clogged throttle, because the symptoms are exactly the same: uneven idling, sudden failures in the engine (which are similar to the failure of one of the spark plugs), reduced power characteristics, knocking during acceleration.

The timing chain needs to be replaced. The price of the timing kit is quite affordable, but you can also buy a fake. Replacing the chain is fast, the cost of the procedure is not high.

The appearance of a sharp and unpleasant whistle

The whistle becomes pronounced on an insufficiently warmed-up engine. The sound gradually decreases or disappears completely after the motor temperature rises. The reason for this whistle is the belt that is installed on the generator. If outwardly no defects are visible on it, then the alternator belt can simply be tightened where the flywheel is located. If sprains or cracks appear, then the alternator belt is best replaced with a new one.

How to properly change spark plugs

The above malfunctions are not terrible if they are eliminated in time. But such a simple operation as the torque of the spark plugs can be a real tragedy, after which it is necessary to replace the cylinder head chain or belt.

Tighten the spark plugs on the MR20DE motor only with a torque wrench. The force of 20Nm must not be exceeded. If more force is applied, then microcracks may occur on the threads in the block, which will cause tripling. Together with engine tripping, which increases in proportion to the kilometers traveled, the head of the block can be covered with coolant, the car works in jerks, especially when HBO is installed.

Therefore, it is necessary to use a torque wrench. And it is best to change the spark plugs on a cold engine.

What oil is best to fill in the engine

In order for the resource of the MR20DE engine to correspond to the data specified in the technical documentation, all consumables should be changed in time: oil and fuel filters, as well as oil. The oil pump should also be checked periodically. In addition to replacing consumables, the valves should be periodically adjusted (for a long service life, they should be adjusted every 100000 km).

The MR20DE motor manufacturer advises using only high-quality oils, such as Elf 5W40 or 5W30. Of course, along with the oil, the filter also changes. Elf 5W40 and 5W30 have good viscosity and density and can last for a long time. But it is best not to change the oil every 15000 km (as indicated in the technical description), but to do this operation more often - after 7500-8000 km and take care of the engine pan.

As for gasoline, it is better not to save money and fill the engine with fuel with an octane rating of at least 95, as the repair manual says. Also, now there are a large number of additives on the market that will save not only the fuel system, but also the life of the engine.