Great Wall GW4D20 engine
Content
The diesel engine with has a turbocharger, in which the geometry of the gas distribution phases changes and there is a charge air cooler. It also has a system with two camshafts operating according to the DOHC system. When developing this internal combustion engine, a large number of modern technologies were used: an electronically controlled high-pressure fuel rail, an exhaust gas recirculation system called “EGR”, etc.
The installation of this power unit was carried out on various classes of vehicles, such as LCV, SUV / MPV, compact cars and SUVs of the Great Wall Motor Company Limited. The motor unit is a complex technical solution, in the manufacture of which strict requirements are applied to the quality of the materials used. Repair and maintenance work should only be carried out by qualified professionals.
Great Wall vehicles fitted with the GW4D20
Great Wall Hover H5
The most common car on which this engine was installed is the Great Wall Hover H5. The production of this Chinese car began in 2011. In the technical part of the car, in addition to the diesel unit, there is an aluminum transfer case. In addition, all modifications have a plug-in all-wheel drive. The transmission of torque is carried out by an electromechanical clutch. Vehicle suspension: independent and multi-link in the front, dependent in the rear.
In the version of the car in the "Lux" configuration with this diesel engine, two airbags, ABS and EBD systems, an adjustable steering wheel, fog lights, an immobilizer, power windows, a leather steering wheel, 17-inch alloy wheels, an electrically adjustable driver's seat, a camera rear view, heated front seats, electrically adjustable heated mirrors, rain and light sensors, USB connector.
Great Wall Hover H6
In 2012, the Chinese automobile concern launched the Hover H6 model, with this power plant under the hood. Unlike its predecessor, this vehicle is designed for city driving. The appearance of the crossover has also changed. The creator of the Mercedes-Benz M-class, Matthias Deufel, took part in the development. Thanks to this, the new Great Wall SUV could compete in design with European competitors Honda CR-V and Toyota RAV4.
In addition to the diesel engine, the car could be equipped with 1,5-liter and 2,4-liter gasoline engines. Their fuel consumption was 8 liters in mixed mode. The diesel two-liter engine consumes 7,5 liters per 100 kilometers in the combined cycle. Russian buyers were given a choice of 3 trim levels Luxe, Elite and Standart.
The basic version is equipped with a hydraulic booster, electric mirror elements, vertical adjustment of the steering wheel, power windows, on-board computer and a CD player. As additional options, the Chinese automobile concern offers: a genuine leather interior, an improved multimedia system, seat heating, tinted windows at the rear of the car, etc.
Design of the GW4D20 motor unit
The engine serial number is located on the left side of the cylinder block. In general, a diesel engine is a very complex technical device, the operation of which is based on the conversion of the combustion energy of a fuel liquid into mechanical energy. In the modern world, there are a huge number of diesel engines, but each of them has its own characteristics and individual components. The average resource of the engine installation is 200 km. If you use low-quality fuel, then it can significantly decrease. The weak point is the injectors, which are very sensitive to fuel quality.
Head and cylinder block
The cylinder head is located above the cylinders and is one of the elements that form the working chambers. Together with it, intake and exhaust valves, hydraulic compensators, drive levers, camshafts and oil nozzles are installed. Also in the cylinder head there are channels for the inlet and outlet of the oil fluid, as well as cooling jackets through which the coolant circulates. The main elements that are the basis for the functioning of a diesel engine are concentrated in the cylinder block
crank mechanism
The purpose of this device is to convert the reciprocating movements of the piston system, obtained during the combustion of the fuel liquid in the working chambers, into rotational movements of the crankshaft. This process provides the operating cycles of the engine installation. The crank mechanism includes pistons, connecting rods, crankshaft, flywheel and other elements.
Actuating mechanism of the valve system and mechanism
The purpose of these elements of the Great Wall engine is: the timely raising and lowering of the valves during start-up and exhaust. This ensures the maximum amount of air mixture in the cylinder cavity and the removal of exhaust gases from them. This mechanism consists of intake and exhaust valves, plates, springs, valve stem seals, drive belt, pulley, intake and exhaust camshafts, levers, actuator valves, hydraulic compensators, etc. The exhaust gas recirculation process is carried out by an electronic EGR valve and a special EGR system radiator. Also, these elements effectively reduce the content of Nox in the exhaust gases that enter the environment.
Turbocharger
The main purpose of the turbine is to increase power and torque. As you know, a turbo element in a car pumps compressed air into the working cavity of the cylinders. To carry out this process, the energy of the exhaust gases is used. The volume of the working chambers always remains unchanged, however, high compression allows you to supply a large amount of air mixture inside the cylinders. This contributes to an increase in the amount of fuel liquid injected into the working chambers, which also increases the efficiency of its combustion.
Fuel supply system
The fuel equipment of the GW4D20 diesel engine provides fuel supply to the working cavity of the combustion chambers in a certain amount. This process is carried out with the help of pressure, the parameters of which are set by the technical documentation. To ensure optimal conditions for the combustion of the fuel liquid, it is necessary that the pressure strictly comply with technical standards. 
This process is controlled by an electronic control unit, which must also determine the amount of fuel that needs to be provided to the working chambers of the cylinders in order to provide the necessary power reserve. The fuel system consists of a fuel tank, a filter, a high pressure pump, a ramp, injectors, fuel pipes and sensors, etc.
Lubrication system
This system reduces the level of friction and wear of the contacting surfaces due to the lubrication of the oily liquid. It also cools all elements of the engine installation, removes carbon deposits and prevents corrosion. The lubrication system consists of an oil receiver, an oil pump, an oil filter, an oil cooler, a main oil line and an oil pressure sensor.
Cooling system
The operation of a diesel engine cannot be carried out without generating a large amount of heat. The cooling system removes heat from the surface of the parts in a given temperature regime. The cooling system consists of a radiator and two barrels that ensure its functioning, an expansion barrel, a liquid pump, a thermostat and a fan.
Ignition system
With the help of the engine ignition system, the crankshaft is rotated at a certain speed, which is necessary for starting. This system consists of a starter, battery, glow plugs and other devices. After starting, the joint operation of the cylinder block, cylinder head, crank mechanism, drive valves, exhaust gas inlet and outlet systems, as well as fuel equipment provides engine operating cycles by converting the energy of the combustion of the fuel liquid into mechanical energy.
It is important to monitor the technical condition of these elements, since it directly affects the efficient operation of the engine installation. The cooling and lubrication systems are not directly related to the work cycles, but they ensure the stability and uninterrupted operation of the diesel engine.
Specifications of the GW4D20 engine
| engine's type | Turbodiesel, four-stroke, common rail injection system |
|---|---|
| Number and arrangement of cylinders | 4, in-line |
| Fuel type | Diesel |
| Working volume, cubic meters cm | 1996 |
| Compression ratio | 16.7:1 |
| Maximum power, kW (hp) / rpm | 110 (150) / 4000 |
| Maximum torque, Nm / rpm. | 310 (1800-2800) |
| Type of transmission | 6 MKPP, 5 AKPP |
| Axels | 4 × 4 |
| type of drive | Full |
| Curb weight, kg | 1890|1920 |
| Maximum speed km / h | 150 |
| Acceleration time to 0-100 km/h, sec | 11.5 |
| Fuel tank capacity, l | 70 |
| Fuel consumption | |
| City/highway/combined l/100 km | 9,3/6,9/7,8 |
