BMW N47D20D engine

N47D20D is a diesel power unit with a maximum output of 218 horsepower with a displacement of 2 liters. The motor is equipped with an additional supercharger in the form of a turbine. The engine was installed under the hood of BMW cars of the first and third series, as well as other models.

Engine specifications N47D20D

Advantages

In 2007, the first series of BMW cars, which was produced in the E87 body, began to be equipped with diesel engines of the N47 series, which replaced the outdated version of the M47. A distinctive feature from the predecessor is that the engine N47D20D began to use a lightweight cylinder block, which was closed, and made of aluminum. The engine used cast iron liners, as well as a pair of balancer shafts. The diameter of the cylinders is 84 millimeters. Inside the block there was a forged crankshaft, providing a piston stroke of 90 millimeters, and forged connecting rods. The pistons had a compression height of 47 millimeters, which allowed to obtain a compression ratio of 16.5 to 1. All this construction allowed to provide a working volume of 2 liters.

From above, the block is covered with an aluminum cylinder head with 16 valves, on which 2 camshafts are installed. The intake valves were 27.2 millimeters in diameter, and the exhaust valves were 24.6 millimeters. The valve feet were of the same thickness – 5 millimeters each. The BMW N47D20D engine is equipped with Common Rail fuel injection system as a power system, as well as a turbocharger with a standard intercooler.

The timing mechanism uses a chain, which is located at the rear of the engine. The manufacturers declared the chain as a maintenance-free element, but in fact everything turned out to be far from so, about the problems associated with the chain drive is written below. In the design of the power unit, the exhaust gas recirculation valve is used, as well as a dual-mass flywheel.

Along with this power unit on the assembly line was also a version with a working volume of 1.6 liters, which was marked N47D16, and together with it was produced a six-cylinder diesel engine N57. The year 2014 brought the fact that the motors of the N47 range were removed from production, and they were replaced by the more modern B47.

Disadvantages

A high level of noise can be heard from the rear of the powertrain. This is the most well-known and widespread problem caused by a stretched timing chain. In practice, the life of the chain is about 100 thousand kilometers. It is not uncommon for the problem to occur much earlier. There is only one way to solve the problem – to replace the stretched chain, and it is necessary to do it as early as possible, otherwise it can break off, which will entail the need for major repairs of the motor. An additional surprise is that the chain drive is located in the rear of the motor, and in power units manufactured since 2009, the replacement will have to be done together with the crankshaft.

More to extraneous sounds can lead to extraneous sounds crankshaft damper, which is not distinguished by a large resource, and goes about 100 thousand kilometers. Sometimes it can go more, but after that you still have to replace the unit.

The powertrain design utilizes vortex flaps, just like the M47 motor line. But there is one very important feature – they cannot fall off inside the engine. But despite this, the operation of the exhaust gas recirculation system can cause the flaps to become completely covered with fouling. To avoid such a malfunction, it is better to shut off the EGR valve altogether, and clean the flaps together with the manifold. It is even better to simply remove the problematic nodes, putting plugs in their place. To ensure normal operation of the engine, after all this will require a competent adjustment of the electronic control unit.

In addition, if such an engine is overheated, cracks may form in the block between the cylinders. You can try to weld these defects, but most often you have to go in search of a whole block of cylinders, as welding cannot cope. Turbines run normally – they can go more than 200 thousand kilometers without any problems.

The life of N47D20D is highly dependent on maintenance. If all the problematic units are eliminated in time, and the engine is well maintained, it can drive more than 300 thousand kilometers without the need for overhaul.

In order to minimize problems arising during operation of the power unit, it is best to change the engine oil as often as possible. At the same time, you should use only original grease, which is prescribed by the manufacturers. It is not superfluous to use quality fuel and timely maintenance together with measured operation.

Modifications

The line of power units turned out to be quite successful, so the Bavarians for a long time did not remove it from the assembly line, and also constantly improved. In total, a huge number of modifications were produced:

• From 2007 to 2012, the weakest version of the range was produced – N47D20K0, which was characterized by the installation of an additional supercharger Garrett GTB1749VK. The maximum power of this motor was 116 horsepower, and the peak torque reached 260 Newtons.
• N47D20U0 is an engine that was produced from 2007 to 2013, and it featured a power output of 143 horsepower and a maximum torque of 300 Nm. The ECU is a DDE7.0, which controls a Garrett GTB1749VK turbine that delivers 1.5 bar of operating pressure. Similar to the weaker engine, it is fitted with solenoid injectors.
• From 2007 to 2013, the N47D20O0 power unit was produced, which featured a maximum output of 177 horsepower, and 340 Nm of torque. DDE7.1 is used as an electronic engine control unit. Additional supercharger MHI TF035HL operates at a pressure of 1.55 bar, and also used piezoelectric fuel injectors, characterized by higher pressure in the ramp.
• The N47D20T0 / N47TOP is the most powerful engine in its range, which was produced from 2007 to 2013. The version was equipped with twin turbines, and operated on the Twin Turbo system. The superchargers used were BorgWarner KP35 and K16, which blew up to 2 bar. Also this engine is characterized by the use of a new exhaust system, even greater pressure in the fuel ramp, and the installation of electronic control unit DDE 7.1. All these manipulations allowed to obtain a maximum power of 204 horsepower and torque of 400 Nm.
• The N47D20K1 / N47TU is the powertrain that replaced the N47D20KO engine and was produced from 2011 to 2015. The main difference between the engine and its predecessors was that it provided a 3 percent reduction in fuel consumption. The maximum power output is 116 horsepower and peak torque is 260 Nm.
• N47D20U1 / N47TU is a motor that was produced from 2011 to 2015. Its main difference is the use of IHI RHV4-T39 turbine and electronic engine control unit DDE7.1. The maximum power is 143 horsepower, peak torque is 320 Nm. Despite the fact that the characteristics of the motor are almost identical to the base version, this engine meets the standards of Euro 5 environmental class.
• The N47D20O1 / N47TU is a powertrain that was on the assembly line from 2010 through 2017. As an additional supercharger in the design used a turbine MHI TF035HL and electronic engine control unit DDE7.1. Maximum power was 184 horsepower, and peak torque reached figures of 380 Nm.
• N47D20T1 / N47TU TOP / N47S1 is the top version of the N47TU engine, which was characterized by the fact that it was TwinTurbo. The engine was fitted with two BorgWarner K16 and KP35 turbines. In the design there was a modified intake and exhaust, and as an electronic control unit used DDE 7.31. This made it possible to get 218 horsepower and 450 Nm.
• The N47C20U1, produced from 2011 to 2014, was the N47D20U1 version of the Mini Cooper SD.

Technical specifications

The exact displacement of the inline four-cylinder engine is 1995 cubic centimeters. The cylinder diameter is 84 millimeters, and the piston stroke reaches 90 millimeters. There are 4 valves on each cylinder. The fuel compression ratio is 16.5 to 1.

During engine operation, up to 191 grams of pollutants per kilometer are emitted into the environment. The average consumption of the N47D20D is between 4.9 and 6.8 liters of diesel per every 100 kilometers.

The power unit develops a maximum torque of 450 Nm at 2.5 thousand rpm. Thanks to the installation of a pair of turbines, a peak power of 218 horsepower can be reached at 4.4 thousand rpm.

This engine is installed on the following models:

BMW 5-Series (F10)