The AZ series has become an excellent replacement for the S category engines. The AZ collection of the largest Japanese automobile manufacturer includes in-line four-cylinder gasoline engines. This product includes an aluminum cylinder head with special camshafts and an aluminum engine block made of cast iron cylinder lenses.
A distinctive feature of this series of engines was the use of the latest engineering technologies (for example, inclined type "squish" combustion chambers with mixed centers of the crankshaft and cylinders). It is also worth noting that the steel crankshaft is equipped with five high-quality bearings and eight main counterweights, which guarantees the balance and stability of the entire mechanism. The 2AZ-FE engine itself has the following parameters: 62.6 * 60.8 * 68.1 centimeters. Now there is an active distribution of new engines of the AR series brand.
Technical parameters of Toyota 2AZ-FE engines
The main technical characteristics of this modification of motors include:
- The number of cylinders is 4.
- The number of valves is 16.
- The highest power rating is 160 horsepower.
- Volume - 2.4 liters.
- The moment of force - in the presence of 400 revolutions is equal to 220 N * m.
- The cylinder diameter is 8.85 centimeters.
- The compression ratio is 9.1 to 1.
- Knock resistance of fuel (octane index of gasoline) - from 95.
Due to the versatility of the above technical characteristics of the motor, this mechanism is widely used in vehicles of different price categories. However, the constant development of modern technologies has significantly reduced the prestige of the 2AZ-FE series engines around the world. The main technical and operational advantages of engines undoubtedly include: a large number of technical innovations, economical fuel consumption, and simplicity of design. The disadvantage is the costly and often difficult repair of the unit.
Technical parameters of 2AZ-FSE engines
The main technical characteristics of the motors of this series include:
- Volume - 2.4 liters.
- The highest power rating is 163 horsepower.
- The cylinder diameter is 8.9 centimeters.
- Engine type - chain drive on gasoline fuel.
- Fuel consumption per 100 kilometers is 9.5 liters.
- The compression value is 11.
- The piston stroke is 9.6 centimeters.
- There is no start-stop mechanism.
The difference between Toyota 2AZ engine models
- the first basic modification of the engine with a compression ratio of 9.6 - 2AZ-FE. This unit has a maximum power of 160 horsepower. At the end of 2008, the engine design underwent significant changes - the camshafts were replaced, due to which the compression ratio increased to 9.6, and the power to 166 horsepower;
- the second model of the 2AZ-FSE engine is equipped with an instant fuel injection system, the compression ratio is 11, and the power is 163 horsepower. To date, the release of the unit has been completed;
- the third model in this series, a hybrid engine based on the Atkinson principle - 2AZ-FXE. Compared to previous versions, the engine has a redesigned camshafts and a high compression ratio (12.5), while the engine power is 130 or 150 horsepower.
What is the difference between FSE and FE engine modifications?
The differences between the FSE motor and the FE are:
- high pressure fuel pump for diesel engines. The pressure of the mechanical pump can reach 120 bar (typical for diesel engines). The pressure of the electric pump (for injection engines) is about 3 bar;
- engine injector. Vortex nozzles can create different shapes of the fuel jet depending on the mode of operation of the engine: in power mode - a conical shape, in the lean combustion mode - a narrow cylindrical shape;
- operation of the engine piston. A special hole is provided at the base of the unit, through which the direction of the air-fuel mixture is determined in the direction of the spark plug;
- engine intake system. The FSE model is equipped with vertical intake ports - they create a "reverse vortex" in the cylinder, determining the direction of the air-fuel mixture towards the combustion plug (standard motors have the opposite direction of the vortex in the cylinder);
- throttle operating on the principle of electronic control. Thus, the motorist does not control the operation of the damper, its operation is carried out using the accelerator pedal position sensor. After that, the electric control unit starts the throttle valve through the electric motor. Such a mechanism hits hard on the wallet of the car owner.
Engine Disadvantages
Most car owners who have encountered the operation of the 2AZ-FE engine note the rapid overheating of the device during long trips. This unit is not intended for long-term driving at high speeds. Drivers call expensive maintenance and repair another significant disadvantage of the mechanism (for example, when rings occur, a complete replacement of all cylinders is necessary). The plastic intake manifold is also notable for low reliability.
One of the most important disadvantages of this unit is the lack of repair parameters. This situation leads to the fact that when depreciating individual parts of the motor (often due to long-term operation or the use of low-quality fuel), a complete replacement of the unit is necessary. This is due to the fact that the thin-walled cylindrical block is not intended for the use of repair components. To avoid this problem, many drivers use contract engines.
Gas distribution mechanism of the drive
The timing drive is understood as a sixteen-valve DOHC, the power drive is carried out through a single-row roller chain. The chain tension is carried out using a specialized hydraulic tensioner, and lubrication with an oil-type nozzle.
The intake camshaft is equipped with a VVT modification drive sensor (mechanism for determining valve timing), as well as a phase limit indicator of 50 degrees. The presence of a set of pushers allows you to adjust the clearance in the valve drive. This prevents drivers from having to make costly and difficult mechanical adjustments.
Chain wear resistance is a rather unpredictable parameter. It is almost impossible to predict when the chain resource will end - it can be either 300,000 or 150,000 kilometers. Chain wear is displayed by unpleasant noise during operation and shortcomings in valve timing. Experienced motorists recommend a complete replacement of the chain and all components of the drive, as old working parts lead to the "obsolescence" of a repaired or new chain. However, not all drivers adhere to this advice, because the intake camshaft sprocket is included in the VVT drive kit. The hydraulic tensioner of the system requires timely repair, but this is the fastest and most inexpensive process.
What do drivers think of the engine?
In summer, fuel consumption is about ten liters, while in winter it can reach twelve liters. For ten thousand kilometers, about three hundred milliliters of oil are consumed - this despite the fact that the engine is used in urban conditions when driving at high speeds. Some drivers note that for Toyota engines, oil consumption is slightly too high.
We bring to your attention the price list for a contract engine (without mileage in the Russian Federation) 2AZ-FE
Today, the popularity of Toyota Camry for Russian motorists is undeniable. For more than three decades, it has been a sales leader. It is understandable, a comfortable and roomy sedan with a price, like a budget Korean in the best configuration, makes such a purchase very attractive. And the 2.4-liter 2AZ-FE engine released at the turn of the century, economical and not so forced, made it possible to get closer to the business class.
Engine Features
Cheap and technological 2AZ-FE has an open cooling jacket and is made of aluminum alloys under pressure. The motor is equipped with a chain drive, the intake camshaft is equipped with a VVT-i system, which is responsible for the timely change of phases. The intake manifold is made of plastic and is located behind the engine, which protects it from severe deformations in case of accidents. Significantly reduce the weight of the motor plastic gears of the balancer shaft, coupled with a plastic intake manifold.
The FE engine's oil pump has a separate chain drive, allowing it to instantly build up the correct pressure at start-up.
Such features of the 2AZ-FE engine, with its low power, contribute to equalizing traction characteristics and economical fuel consumption - about 11.5 liters in the urban cycle.
Typical malfunctions of the power unit
The following factors indicate that the 2AZ-FE motor will soon fail:
- Floating idle with subsequent engine shutdown.
- Transient modes with characteristic power dips.
- Deteriorating startup with multiple attempts.
- The appearance in the expansion tank of the smell of exhaust gases.
- Detection of an antifreeze leak under the intake manifold.
- Curvature of the landing plane of the cylinder head due to stretching of the mounting bolts.
The reasons for all these consequences are the depletion of consumables, early failures of components and parts of the 2AZ series engine, and an offensive design miscalculation by Toyota engineers. We list the most characteristic of them:
- Development of the intake camshaft sprocket (VVT-i mechanism drive).
- Failure of the coolant pump.
- Failure of the overrunning clutch of the generator during the development of the resource.
- The occurrence of rings and the development of pistons.
- Development of a resource of piston rings and oil scraper caps.
- The design miscalculation of engineers is the thin bolts of the Toyota Camry cylinder head and, as a result, their stretching and warping of the head plane.
If the first five reasons are the development of the resource of various components and parts of the FE engine, which is quite acceptable and understandable, then the sixth reason requires expensive engine repairs.
Block head repair
After establishing the cause, we partially disassemble the engine: remove the pulleys, valve cover, disconnect the intake and exhaust manifolds. We disassemble the gas distribution mechanism together with its drive. On the camshafts, an emulsion (a mixture of antifreeze and oil) is visible, formed as a result of pulling the bolts. We unscrew the bolts of the 2AZ-FE motor head and remove the head from the block. Check the plane of contact. If she is led, then we give it to the workshop, where the part is leveled on special grinding machines.
After restoring the geometry of the cylinder head, there are two ways to improve the fastening of the head of the block. The first is to drill holes, cut threads in them and screw in the studs on which the head will be fixed, in this case nuts are placed with engravers for reliability. The second is to supply a repair kit that was released by Toyota after recognizing its constructive miscalculation.
It consists of threaded bushings with longer threads, and, imagine, after installing the kit, the defect no longer appeared. Then, in the Toyota Camry of release after 2004, the threads in the cylinder head were lengthened by 6 mm, and the “head failure” no longer occurred.
Let's return to our engine repair - after restoring the mount, we wash the cylinder head, carefully grind the valves and replace the valve stem seals. We put the head in its place in the 2AZ-FE motor with a new gasket and tighten the mount to the torque specified in the instructions. We insert the camshafts into the head and tighten the seats, after which we assemble the gas distribution mechanism. We connect the intake and exhaust manifolds to the head, put the valve cover.
As for the engine life of the Toyota Camry 2.4 engine, dealers promise that the car will easily withstand 400 thousand kilometers, but the exact mileage before the overhaul is still unknown.
Conclusion
Toyota Camry is a very reliable car and after engine repair it will last for a long time. Everything depends not only on the car, but to a greater extent on the personal qualities of the owner: both on the driving style and on the degree of car care.
Toyota Camry has been produced for more than 30 years, and in terms of price-quality ratio, historically, it did not have many competitors, especially in Russia. In the secondary market, Toyota Camry 2.4 is super popular today! This is understandable: a comfortable and roomy premium sedan at the price of a budget Korean in a top-end configuration sounds tempting. Are there any pitfalls in this model? Let's figure it out.
Today we’ll talk about the 6th generation Toyota Camry with a 2.4-liter engine with a capacity of 167 horses and a 5-speed one, as the most popular model of the entire Camry line.
Salon
The interior of the car turned out to be discreet, and even ascetic. Only the wooden inserts on the panels are embarrassing, with which the Japanese, apparently, wanted to emphasize the status of a sedan. Toyota Camry 2.4 is clearly rather weak. There are questions about the quality of finishing materials. For example, paint is peeling off silver parts, and leather parts quickly lose their presentation. But there is an undeniable plus — the place inside, more than enough!
Engine
With a 2.4-liter engine, the Camry not only doesn’t drive ... no, it’s smooth and comfortable in motion, but it’s somehow too calm, or something. This is partly to blame for the adaptive machine, which lazily adjusts to the driver's driving style. In general, if you like it hot, you need to take a car with a 3.5-liter engine. That's just sportiness in management is not added in any case. Although the “empty” steering wheel and rolls in corners are an adequate price for a high level of comfort.
And what about reliability? Toyota motors are sometimes called "millionaires", but this is not said about 2.4, although, in general, it is considered reliable. Good fuel and regular maintenance is the key to success!
There is, perhaps, only one design flaw - the cylinder head is fixed on very long and thin studs, which are pulled out with a range of 100 to 120 thousand kilometers, and the engine begins to “flow inward”. It is possible to repair this defect, but only unofficially, by replacing the "native" studs with new, more powerful ones. But, unfortunately, this repair is heavy and costs about 150 thousand rubles.
Another weak point of the Toyota Camry 2.4 is often called the water pump. Sometimes it has to be changed even before 60,000 mileage. The drive belt tensioner is also not famous for its durability, the characteristic clicking of which can be heard after 100 thousand kilometers. But the 5-speed automatic, although thoughtful, but problem-free, of course, if it is serviced on time.
Over time, Camry 2.4 almost does not, although real acceleration to hundreds increases. , and in the city it is 15 liters per 100 kilometers, slightly higher than official data.
Suspension
And what about the running gear? The biggest problem with the Toyota Camry 2.4 is the drives, which, due to their design features, “fly” regularly. As for the rear suspension, these are rear transverse links. Stabilizer struts and bushings are also considered Camry's weak points, and the front brake discs often “take away” after 30 thousand kilometers.
When asked what emotions it evokes in you, many owners, after a long pause with a smile on their lips, answer - none. Then the question arises, why does a car that claims to be a premium segment, luxury and comfort evoke such emotions? So something is wrong with him.
Everyday problems
On the technical part of the owners of Toyota Camry 2.4 often. After a run of 60,000 kilometers, the evaporator oxidizes, and white particles similar to chalk begin to enter the cabin. Repair of the system costs about 30,000 rubles. Complain many and staff. They are often buggy, and sometimes completely fail for no apparent reason.
Buying a new car
Today, the 7th generation of the Toyota Camry sedan is on sale, and soon a restyled version will appear at dealers. In the same configuration, a new car costs at least 1,170 thousand rubles. It has become more powerful, faster and more economical. Is that in the cabin progress is not as obvious as we would like.
According to statistics, 8 out of 10 Toyota Camry 2.4 owners are satisfied with their car. They like spaciousness, comfort and, most importantly, reliability. Well, they complain most often about weak, poor sound insulation and a “thoughtful” machine. If you take care of the Camry, then there should be no serious problems up to 150 thousand kilometers, and besides, if you are tired of it, you can easily sell it. In the secondary market, it will be “torn off with your hands” from you, and you will hardly lose in price.
2AZ-FE, as well as many other cars from the Japanese concern Toyota.
Scheme 2AZ. Image toyota-club.net.
AZ series engines use lightweight pistons
Timing chain replacement
Replacing the timing chain with 2AZ-FE is carried out as the main elements included in the gas distribution mechanism wear out. The cost of the original repair kit is very high, so it is more rational to use analog options. Their price can range from 3,500 to 10,000 rubles. Produced by the Japanese company OSK. You will also need to purchase engine oil, an oil filter and sealant. The purchase of these materials will cost three thousand rubles. When replacing the timing chain in service centers, the cost of work will be about 12,000 rubles.
AZ chain tensioner. Image toyota-club.net
When replacing the timing chain, it is required to match all the marks provided in the 2AZ-FE. With their help, the following elements are exposed in relation to each other:
- crankshaft pulley with a zero mark on the frontal part;
- camshaft sprockets with camshaft bearing cover;
- intake and exhaust camshaft sprockets.
Toyota 2AZ engine tuning
You can use ready-made solutions to increase the power of gasoline Toyota 2.4 2AZ. Its value reaches more than three hundred horsepower. To do this, you will need to use a turbo kit, with the necessary components, based on the T04E.
Motor modifications
Toyota 2AZ has the following modifications:
- 2AZ-FE - the basic version of the engine with a power of 149 hp;
- 2AZ-FSE (163 hp) - 2AZ-FE analog motor with direct injection system;
- 2AZ-FXE - used for hybrid models.
2AZ-FXE is installed on the hybrid Camry XV40
Conclusion
Toyota 2AZ series show sufficient reliability. The 2AZ resource is about three hundred thousand kilometers (it is not uncommon for mileage without overhaul up to 400 - 450 thousand km), subject to proper operation. To do this, it is required to maintain key elements in time, pour only high-quality engine oil regulated by the operating instructions.
AZ engines and variants are manufactured by Toyota Motor Corporation. The series has several modifications, one of which, 2 AZ-FE with a volume of 2.4 liters, has been installed on Toyota Camry models since 2002.
Design features and disadvantages
1. Scheme of fuel injection of the classical distributed type. Under operating conditions at low temperatures or low engine speeds, fuel is supplied in pair injection mode. Under standard operating conditions, a sequential injection scheme is used.
2. The fuel system is of conventional type, has a pressure regulator built into the pump housing. The fuel manifold is made of aluminum and is fitted with a pressure fluctuation damper.
3. The engine oil supply pump is driven by an additional chain from the crankshaft. Such a system improves the pumping of the oil mixture during engine operation at low temperatures. The reverse side of the system is a larger number of moving elements that require additional attention.
4. Aluminum block of the cylinder-piston system with cast iron sleeves built into it. Aluminum parts reduce the mass of the mechanism, but make it vulnerable to deformation. Carrying out a major overhaul of the Camry 2.4 engine, it is required to replace the liners.
5. Self-destruction of the cylinder head mounting system is another drawback of this type of engine. The cylinder head is deformed during operation. As a result, the fastening bolts under pressure come out of the socket, breaking the threads. During repair work, it has to be renewed or damaged elements of the piston system have to be changed. The cause of the "sore" was a factory marriage, which Toyota later recognized and partially eliminated.
6. Another weak point of Toyota Camry is gears made of polymer material. The goal was the desire of the manufacturer to reduce the noise during the operation of the car. The result was an increased risk of breakage due to low strength.
Signs of a car malfunction
Toyota Camry, like any car, can fail due to certain operating conditions. However, there are a number of model-specific faults that appear most often.
The following factors indicate the need for overhaul:
- the engine is difficult to start;
- power drops in transient mode;
- increased consumption of engine oil;
- coolant is leaking
- the geometry of the mating plane of the cylinder head is broken;
- the engine runs intermittently, including idling;
- the intake manifold produces uncharacteristic noises;
- the motor is overheating.
Overhaul of engines of the 2AZ-FE 2.4 l series
A characteristic problem of engines of this type is the failure of the cylinder head mounting bolts. This is what most often leads to the need for overhaul.
In 2007, Toyota acknowledged the mistake and, in the course of improvements, the thread length was increased. This did not completely solve the problem, but reduced the risk of a breakdown.
There are two ways to troubleshoot.
1. Replace the cylinder block. This method is recommended by the manufacturer.
2. Update the thread (plus make it larger) and use a threaded sleeve. This option is most often used in practice, especially for vehicles whose warranty period has expired. Later, the manufacturer acknowledged the need for such measures and even recommended a specific repair kit with bushings to fix the problem in out-of-warranty vehicles.
You can repair a Toyota Camry engine in several stages:
1. Diagnostics and initial examination are carried out.
2. Partial disassembly of the engine is being carried out.
3. Engine oil is drained.
4. A thorough disassembly of the engine is being carried out.
5. Parts of the mechanism are cleaned of smudges of mixed oil and coolant.
6. Failed parts are replaced and/or threads are updated on stripped bolts.
7. The engine is being assembled. Includes: installation of cylinder head, tightening of mounting bolts, installation of camshafts, timing, etc.
8. The control launch of the mechanism is carried out and its functioning is checked.
There are several more characteristic model problems.
1. Abnormal intake manifold noise at idle. The problem is typical for cars of early years of production. The solution is to replace the manifold with an updated model.
2. Occurrence during operation of a leak (as well as extraneous noise) in the coolant pump. The solution to the problem is to replace the pump.
3. Oil consumption. The problem arises either with the age of the car (especially noticeable with increasing loads), or with models of recent years of production. Excessive oil consumption leads to a classic problem - intense carbon deposits in the engine compartment. In this case, repair work is carried out in order to replace failed elements and clean the engine from carbon deposits. Most often, spark plugs, piston rings, valve stem seals are subject to replacement.
Diagnostics and repair of the engine should be carried out in proven workshop, in which adequate calculate the cost of repairs and do the job with the highest quality. A find a car service nearby nowadays it won't be a problem.
It is not recommended to carry out work on your own, since the replacement (checking) of complex components of the mechanism requires strict adherence to technology and experience in this area. An improperly fitted bushing or poorly cleaned carbon deposits can lead to more serious damage than the original one. And to increase the cost of repairs.
