Daewoo Nexia engine design 8 valves

Engine device

All daewoo nexia engines installed on the car were a classic gasoline 4-cylinder, in-line, four-stroke unit. Structurally, the engines were identical, had the same lubrication system, cooling system, and cylinder block. The engine marked G15MF also had a number of significant differences from the Opel Kadett E

The gas distribution system used a scheme with an overhead arrangement of one camshaft. The catalytic converter and lambda probe were missing.

In the newer modification, labeled A15MF, minor design changes were applied. The gas distribution mechanism was driven by two overhead camshafts. The number of valves was increased to 4 per cylinder, and the ignition system was significantly changed. A lambda probe and a catalytic converter were installed on the power plant.

The engine control system consists of an electronic control unit (ECU), sensors for engine and vehicle operating parameters, as well as actuators. The ECU is a special-purpose mini-computer. It consists of random access memory (RAM) and programmable read-only memory (PROM). RAM is used by the microprocessor to temporarily store current information about engine operation (measured parameters) and calculated data. From RAM, the engine control unit takes programs and initial data for processing. Codes of any faults that occur are also recorded in RAM.

General description of power units

All daewoo nexia engines installed on the car were a classic gasoline 4-cylinder, in-line, four-stroke unit. Structurally, the engines were identical, had the same lubrication system, cooling system, and cylinder block.

The engine marked G15MF also had a number of significant differences from the Opel Kadett E.

The gas distribution system used a scheme with an overhead arrangement of one camshaft. The catalytic converter and lambda probe were missing.

In the newer modification, labeled A15MF, minor design changes were applied. The gas distribution mechanism was driven by two overhead camshafts. The number of valves was increased to 4 per cylinder, and the ignition system was significantly changed. A lambda probe and a catalytic converter were installed on the power plant.

In 2008, both G15MF and A15MF engines were discontinued. They were replaced by more advanced models labeled A15SMS and F16D3.

G15MF powerplant

This is the first engine that began to be installed on a car.

Characteristics of daewoo nexia engine G15MF:

The Daewoo Nexia engine reaches a speed of 175 km/h to hundreds, accelerating in 12.5 seconds. Fuel consumption in city mode is 9.3 liters per hundred, on the highway - 7 liters per hundred. The engine has proven itself well; with proper care, the engine life without major repairs is more than 200,000 km.

Powerplant A15MF

In 2002, some changes were made to the Daewoo Nexia engine, thanks to which the power of the unit was increased to 85 hp, without reducing the engine life. The most significant change was the use of 16 valves, 4 valves per cylinder.

The main difference from the engine with 8 valves was the use of a new cylinder head. Now it had two camshafts installed, and the ignition was controlled by an electronic unit, thanks to which it was possible to reduce fuel consumption (city - 9.3 liters per hundred, highway - 6.5 liters per hundred). The cylinder diameter was not changed, as for the pistons - grooves for the valves appeared on the bottom.

Powerplant A15SMS

The motor embodies all the best properties of the older predecessor G15MF, in addition, quite significant innovations were introduced to improve environmental performance.

The engine control system received a large number of sensors, which made it possible to more finely control engine settings in automatic mode. An ignition module has been installed. The intake manifold has a new geometry. Two catalytic exhaust gas converters and two oxygen concentration sensors are installed.

The engine power increased to 89 hp, the engine life did not change, thanks to the improvements it began to comply with EURO-3 standards.

Powerplant F16D3

The motor is an improved version of its predecessor F14D3; enough innovations have been introduced into it to improve performance.

Characteristics of daewoo nexia engine F16D3:

Engine diagram

Elements of the F16D3 electronic engine control system:

1* — phase sensor; 2 — engine intake air temperature sensor; 3* — throttle position sensor; 4* — diagnostic block; 5* — coolant temperature sensor; b* — knock sensor; 7 — intake air absolute pressure sensor; 8* — speed sensor; 9* — warning lamp for control system malfunction; 10* — mounting block of fuses and relays; 11 - battery; 12 — electronic control unit; 13zh — wheel speed sensor; 14 — ignition coils; 15* — crankshaft position sensor; 16* — control oxygen concentration sensor; 17* — spark plugs; 18

— diagnostic oxygen concentration sensor

This memory is volatile, i.e. When the electrical power is interrupted (the battery is disconnected or the wiring harness block is disconnected from the ECU), its contents are erased. The PROM stores the engine control program, which contains a sequence of operating commands (algorithms) and calibration data - settings. The PROM is non-volatile, i.e. The contents of the memory do not change when the power is turned off.

The ECU receives information from system sensors and controls actuators such as the fuel pump and injectors, ignition coil, idle speed control, oxygen concentration sensor heating element, canister purge valve, exhaust gas recirculation valve, intake tract length variable valve (on the F16D3 engine ), air conditioning compressor clutch, cooling fan.

Basic engine malfunctions

Daewoo power units have a number of characteristic disadvantages:

The Nexia engine with 8 valves and a volume of 1.5 liters has become one of the most popular on Daewoo Nexia in recent years. Today there are quite a few cars on the secondary market with this engine. 80 hp unit (A15 SMS), this is a naturally aspirated gasoline engine with distributed multipoint fuel injection with an ignition coil, which replaced the 1.5-liter G15 MF engine developing 75 hp. with an unreliable distributor.

Daewoo Nexia engine 8 valves timing device, technical characteristics of Daewoo Nexia 1.5 l.

The Daewoo Nexia engine 8 valves with a volume of 1.5 liters has become one of the most popular in Daewoo Nexia in recent years. Today there are quite a few cars on the secondary market with this engine. 80 hp unit (A15 SMS, the same engine is in the Chevrolet Lanos), this is a naturally aspirated gasoline engine with distributed multipoint fuel injection with an ignition coil, which replaced the G15 MF developing 75 hp. with an unreliable distributor.

Nexia engine design 8 valves

The Nexia engine is a gasoline, four-stroke, four-cylinder, in-line, eight-valve, overhead camshaft. The location in the engine compartment is transverse. The operating order of the cylinders is: 1-3-4-2, counting from the auxiliary drive pulley. The power supply system is phased distributed fuel injection (Euro-3 toxicity standards). The engine has a cast iron cylinder block.

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 a bracket located on the front wall of the cylinder block, and the left and rear ones are attached to the gearbox housing.

Technical characteristics of Daewoo Nexia N150

The Nexia car of the South Korean concern Daewoo was created on the basis of the German Opel Cadet car, produced from 1984 to 1992. The Korean version of the car was called Daewoo Racer. In 1994, the Daewoo company carried out a restyling, after which the model received the final name “Nexia”. In 1996, production of the model began in Uzbekistan (JSC UzDaewoo Auto) and in the city of Aksai near Rostov-on-Don. Since 2000, production of the model (except for engines) has been transferred to Uzbekistan. In 2008, the car underwent restyling, during which some body panels and lighting equipment were changed, and new engines began to be installed. The information is relevant for models 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2021.

Nexia engine cylinder head 8 valves

The Nexia 8 valve cylinder head is cast from aluminum alloy, common to all four cylinders. The head is centered on the block with two bushings and secured with ten bolts. A sealing gasket is installed between the block and the cylinder head.

The intake and exhaust ports are located on opposite sides of the cylinder head. Valve seats and guides are pressed into the cylinder head. The valve closes under the action of a single spring. Its lower end rests on the washer, and its upper end rests on a plate held by two crackers. The crackers folded together have the shape of a truncated cone, and on their inner surface there are beads that fit into the grooves on the valve stem. The valves are driven by the camshaft. The camshaft is cast iron and rotates on five supports (bearings) in an aluminum bearing housing, which is attached to the top of the cylinder head.

Timing drive of Nexia engine 8 valves

The camshaft of the Nexia's 8-valve engine is driven by a toothed belt from the crankshaft. The valves are actuated by the camshaft cams through pressure levers, which rest on the hydraulic lash compensators with one shoulder, and on the valve stems with the other shoulder through guide washers. The engine has hydraulic compensators , which are self-adjusting supports for the pressure levers. Under the influence of oil filling the internal cavity of the compensator under pressure, the compensator plunger selects a gap in the valve drive. The use of hydraulic compensators in the valve drive reduces the noise of the gas distribution mechanism and also eliminates its maintenance.

If the belt breaks, the valve bends! Among other features, it can be noted that the timing belt rotates the pump (water pump). The belt is replaced every 60 thousand kilometers, the pump must be changed every 120 thousand kilometers. Please note that on the old 8-valve engine with 75 hp. The timing belt generally changes every 40 thousand kilometers.

Technical characteristics of the Nexia engine 8 valves 80 hp.

• Working volume – 1498 cm3
• Number of cylinders – 4
• Number of valves – 8
• Cylinder diameter – 76.5 mm
• Piston stroke – 81.5 mm
• Timing drive - belt
• Power hp – 80 at 5600 rpm. per minute
• Torque – 123 Nm at 3200 rpm. per minute
• Maximum speed – 175 km/h
• Acceleration to the first hundred – 12.5 seconds
• Fuel type – gasoline AI-92
• Fuel consumption in the city – 8.5 liters
• Fuel consumption in the combined cycle – 8 liters
• Fuel consumption on the highway – 7.7 liters

A fairly reliable and unpretentious engine, the main thing is to change the oil, timing belt, and pump on time. A completely repairable power unit.

Reading time: 2 minutes

The Daewoo Nexia engine 8 valves with a volume of 1.5 liters has become one of the most popular in Daewoo Nexia in recent years. Today there are quite a few cars on the secondary market with this engine. 80 hp unit (A15 SMS, the same engine is in the Chevrolet Lanos), this is a naturally aspirated gasoline engine with distributed multipoint fuel injection with an ignition coil, which replaced the G15 MF developing 75 hp. with an unreliable distributor.

Technical characteristics of the Nexia engine

Below are brief technical characteristics of engines, such as volume, power, number of valves, torque, compression ratio.

As can be seen from the table above, the most energy-intensive was the last engine, which, by the way, was installed on the Chevrolet Aveo, Cruze and Lacetti.

Daewoo Nexia engine design 8 valves

Engine Nexia 1.5 l. gasoline, four-stroke, four-cylinder, in-line, eight-valve, overhead camshaft. The location in the engine compartment is transverse. The operating order of the cylinders is: 1-3-4-2, counting from the auxiliary drive pulley. The power supply system is phased distributed fuel injection (Euro-3 toxicity standards). The engine has a cast iron cylinder block.

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 a bracket located on the front wall of the cylinder block, and the left and rear ones are attached to the gearbox housing.

Cylinder head for Daewoo Nexia 8 cl.

The Nexia 8 valve cylinder head is cast from aluminum alloy, common to all four cylinders. The head is centered on the block with two bushings and secured with ten bolts. A sealing gasket is installed between the block and the cylinder head.

The intake and exhaust ports are located on opposite sides of the cylinder head. Valve seats and guides are pressed into the cylinder head. The valve closes under the action of a single spring. Its lower end rests on the washer, and its upper end rests on a plate held by two crackers. The crackers folded together have the shape of a truncated cone, and on their inner surface there are beads that fit into the grooves on the valve stem. The valves are driven by the camshaft. The camshaft is cast iron and rotates on five supports (bearings) in an aluminum bearing housing, which is attached to the top of the cylinder head.

Timing drive of Nexia 1.5 l engine.

The camshaft of the Nexia's 8-valve engine is driven by a toothed belt from the crankshaft. The valves are actuated by the camshaft cams through pressure levers, which rest on the hydraulic lash compensators with one shoulder, and on the valve stems with the other shoulder through guide washers. The engine has hydraulic compensators , which are self-adjusting supports for the pressure levers. Under the influence of oil filling the internal cavity of the compensator under pressure, the compensator plunger selects a gap in the valve drive. The use of hydraulic compensators in the valve drive reduces the noise of the gas distribution mechanism and also eliminates its maintenance.

If the belt breaks, the valve bends! Among other features, it can be noted that the timing belt rotates the pump (water pump). The belt is replaced every 60 thousand kilometers, the pump must be changed every 120 thousand kilometers. Please note that on the old 8-valve engine with 75 hp. The timing belt generally changes every 40 thousand kilometers.

Engine characteristics Nexia 8 valves 80 hp

• Working volume – 1498 cm3
• Number of cylinders – 4
• Number of valves – 8
• Cylinder diameter – 76.5 mm
• Piston stroke – 81.5 mm
• Timing drive - belt
• Power hp – 80 at 5600 rpm. per minute
• Torque – 123 Nm at 3200 rpm. per minute
• Maximum speed – 175 km/h
• Acceleration to the first hundred – 12.5 seconds
• Fuel type – gasoline AI-92
• Fuel consumption in the city – 8.5 liters
• Fuel consumption in the combined cycle – 8 liters
• Fuel consumption on the highway – 7.7 liters

Resource of 1.6-liter engine

As mentioned above, only in the N150 version of Daewoo Nexia an engine with a displacement of 1.6 liters appeared. They were also equipped with the Chevrolet Lacetti, where the engine performed quite well. The usual designation for the F16D3 power unit. Another marking of it is LXT. Assembled in South Korea from 2002 to 2013. In terms of design, it is a modernized version of the Daewoo A16DMS engine.

F16D3

Serial production of the engine began in 2002. The new engine replaced the F14D3, which by that time no longer met current environmental standards. Further environmental tightening and changes in the principles of engine construction contributed to the emergence of other engines that replaced the F16D3 - F16D4 and F18D4. In terms of its layout, it is a regular in-line “four” with two shafts of a DOHC gas distribution mechanism. The block is cast from high-strength material, and its cylinders are bored directly into the body itself.

The cylinder head design is designed to ensure the best cooling and effectively blow through the internal components of the internal combustion engine. The 16-valve cylinder head is improved with hydraulic compensators. The F16D3 engine has an insufficiently high-quality timing belt: it requires replacement after 60-80 thousand km. The most problematic areas are the pump, high-voltage wires, spark plugs, and thermostat. All these engine components will have to be replaced within the first 80-100,000 kilometers.

It is very important during operation of the Daewoo Nexia 1.6 F16D3 to regularly check the condition of the timing belt, since if it breaks, the valves are guaranteed to bend. One of the strengths of the engine is the interchangeability of parts with other modifications of the power unit (previous and subsequent)

Problems with finding components and consumables should not arise in a large, medium-sized or even small city. There are enough specialists who sort out this power unit. As for the shortcomings of the F16D3, we can note periodic drops in traction, power, early failure of the timing belt, oil leakage and unstable idle speed.

Car owners often complain about the increased “appetite” of the engine, not only for motor oil, but also for fuel during the operation of the vehicle in an urban environment. But the simple design and the absence of complex systems makes it possible to capitalize on a 1.6-liter installation even in ordinary garage conditions. As for the potential resource of the Daewoo Nexia 1.6 engine, the manufacturer assures that the engine will last 250,000 kilometers. Reviews from car owners indicate a much greater potential of the engine - 300,000 kilometers.

Technical specifications G15MF 1.5 l/75 l. With.

Initially, the engine did not have a lambda probe and a catalytic converter, so as requirements became stricter, it was replaced with more progressive modifications. The engine diagram is copied from the German Opel Kaddet E in 1994:

• inline four for transverse arrangement under the hood;
• SOHC gas distribution scheme with one camshaft;
• adjusting the mixture with a potentiometer similar to the VAZ 2110.

It is possible to boost it using classical methods to increase power, and do it yourself in a garage without involving specialists.

For its time, the G15MF engine had progressive technical characteristics:

The factory manual must contain both a description of the engine parameters and step-by-step operations for repairing/maintenance of the internal combustion engine in order to maintain the warranty and the service life declared from the factory.

Engine 1.5 l, P4 SOHC, 8 valve (one overhead camshaft)

Top of the engine

Lower part of the engine (1.5 l, P4 SOHC)

Specifications

Valve springs

Camshaft journal diameters

Valve lift

Crankshaft

Cylinders and pistons

Tightening torques for threaded connections

Engine lubrication system filling capacity

Engine maintenance and repair

To eliminate the possibility of engine damage and reduced engine reliability, you must carefully study and follow the recommendations below. Do not lift or support a raised engine on the oil pan. In this case, the pan may be deformed and the intake filter of the oil pump of the engine lubrication system may be damaged.

When working on the engine, to avoid short circuits, the negative cable of the battery should be disconnected.

After dismantling the air cleaner or the MSVT unit, it is necessary to close the inlet pipes. This will protect the engine from accidental entry of foreign objects and dirt. For example, a small nut or washer can get into the cylinder through the intake air tract and seriously damage the engine during startup.

In this section of the manual, when describing engine repairs, as a rule, preparatory operations for removing additional equipment are not mentioned: power steering pump, air conditioning compressor, etc.

Design Features

The one and a half liter single-shaft in-line petrol engine G15MF was created before the advent of Euro-2 standards, so the design feature is an extremely simple exhaust tract design without a catalyst and CO probe. The remaining nuances of the internal combustion engine are:

• modernization of the injection system - injection here is distributed, but simultaneous, regulated by a potentiometer, as on domestic Ladas;
• modification of the combustion chambers - these engines have a smaller cylinder diameter compared to the prototype, and a dome-shaped chamber, partially extended into the piston;
• according to the manufacturer, oil consumption is within 300 g/1000 km, and gasoline consumption is 8.8 l/100 km in the combined cycle;
• flat tooth timing belt from the leading brand Geitz with a service life of 200,000 km, although the safety of the valves is already ensured here, they cannot meet the pistons.

The gas distribution system is made according to the SOHC scheme with one camshaft. Compared to the sample, the volumes of the combustion chambers are reduced; power will be increased only in the next series of Daewoo engines - A15MF.

To increase the resource, the attachment is driven by a separate belt, the condition of which is recommended to be monitored every 20 thousand km, and changed after 50 thousand.

After the introduction of Euro-3 and even Euro-4 regulations, Daewoo management continued to install these obsolete power drives on Nexia and Espero until 2008. Compactly located attachments do not interfere with major repairs, including on your own.

Advantages and disadvantages

The strength of the Daewoo concern has always been caring for the user, so the motor has an octane number switch - from the four proposed options 95, 92, 87 and 83, the user can choose any one simply by switching the wires. For example, the octane number of A-76 is approximately 82, so the engine “digested” even 76 gasoline.

The next advantage was the resource of more than 250 thousand km between capitals. Currently, even with improved designs and component diagrams, such a resource is rare for power drives.

The main disadvantage of the G15MF is the magnetoelectric sensor of the ignition distribution system. The wires are constantly being unsoldered, the repair does not help for long. When replacing the sensor, you should focus on a mileage of 10 thousand km. If the device does not fail during this time, it will last a long time. If the problem recurs, it is better to replace the sensor with a new one.

The original cylinder head is suitable for tuning - a camshaft with increased phases can be placed inside.

List of car models in which it was installed

The G15MF engine was used for several versions of cars manufactured by Daewoo:

• Lemans 5i sedan 1C4 – 1994 – 1995;
• Cielo sedan – 1995 – 2000;
• Cielo LoadRunner – 1996 – 1997;
• Nexia KLETN – 1995 – 1997;
• Espero sedan KLEJ – 1997 – 1999.

Since Daewoo Nexia was produced in Korea, Uzbekistan, Romania, Egypt and Vietnam, different manufacturers assigned the car different names - Pointer, Racer, Lemans, Cielo and Chevrolet Nexia. In addition to sedans, the characteristics of the G15MF engine made it possible to install it on three-door and five-door hatchbacks, similar to the Opel Kaddet E.

Maintenance schedule G15MF 1.5 l/75 l. With.

Despite the declared service life of 250,000 km, the manufacturer recommends servicing the G15MF engine during maintenance according to the following schedule:

The classic internal combustion engine design allows you to reduce operating costs and the cost of overhauls.

Review of faults and methods for repairing them

Thanks to the concave shape of the piston and the hole inside it, the G15MF motor does not bend the valve when the timing belt breaks. It has several problems:

Other breakdowns inherent in all in-line engines with an overhead camshaft should be repaired in working order.

Main malfunctions of power plants

Daewoo power units have a number of characteristic disadvantages:

Most such work may require special tools, equipment, and knowledge.