Engines 5A, 4A, 7A-Fe
The most common and today is the most widely repaired from Japanese engines is the engines of the series (4,5,7) A- Fe. Even a novice mechanic, the diagnostics know about possible problems engines in this series. I will try to highlight (assemble in a single integer) the problems of these engines. They are a bit, but they deliver a lot of trouble to their owners.

Date from the scanner:

On the scanner you can see a short, but a capacitive date consisting of 16 parameters for which you can really appreciate the operation of the main engine sensors.

Sensors
Oxygen sensor -

Many owners are drawn to the diagnosis due to increased fuel consumption. One of the reasons is a banal intro heater in the oxygen sensor. The error is fixed by the code control unit number 21. Checking the heater can be carried out by a conventional tester on the sensor contacts (R-14 Ohm)

Fuel consumption increases due to lack of correction when warming up. You will not be able to restore the heater - only replacement will help. The cost of the new sensor is large, and the b \\ y does not make sense (the resource of their developments is great, so this is a lottery). In such a situation, as an alternative, less reliable universal NTK sensors can be installed. The term of their work is small, and the quality leaves much to be desired, therefore such a replacement of the temporary measure, and it should be made with caution.

With a decrease in the sensitivity of the sensor, an increase in fuel consumption (by 1-3l). The performance of the sensor is checked by an oscilloscope on the block diagnostic connectoror directly on the sensor's chip (switching number).

Temperature sensor.
If the owner's sensor is incorrect operation, there is a lot of problems. When the sensor measuring element is cut, the control unit replaces the sensor readings and fixes its value of 80 degrees and fixes the error 22. The engine, with such a malfunction, will work in normal mode, but only until the engine is heated. As soon as the engine cools, run it is problematic without doping, due to the small opening of the injectors. There are cases when the resistance of the sensor is chaotically changed when the engine is running on H.H. - Turns will swim

This defect is easy to fix on the scanner, watching the temperature indication. On the heated engine, it must be stable and not change chaotic values \u200b\u200bfrom 20 to 100 degrees

With this sensor defect, "black exhaust" is possible, unstable work on H.H. and as a consequence, increased flow, as well as the impossibility of running "to hot". Only after 10 minutes of sludge. If not full confidence In the proper operation of the sensor, its testimony can be replaced by turning on its chain with a variable resistor 1k, or permanent 300, for further verification. By changing the sensor readings, the change in revolutions is easily controlled at different temperatures.

Position sensor throttle valve

Many cars undergoing a disassembly assembly procedure. These are the so-called "designers". When removing the engine in the field and the subsequent assembly, sensors suffer to which the engine often lean. When the TPS sensor faults, the engine stops normally throttling. The engine when the rotation set is chopped up. The machine switches incorrectly. An error 41 is fixed by the control unit. When replacing a new sensor, you must configure that the control unit correctly seen a sign of H.H., with a fully released gas pedal (closed throttle). In the absence of a sign idle move No adequate regulation of H.H. And there will be no mode of forced idling when braking the engine, which will again entail an increased fuel consumption. On the 4A engines, the 7a sensor does not require adjustment, it is installed without the possibility of rotation.
Throttle Position ...... 0%
Idle Signal .................. .on

Absolute Pressure Sensor Map

This sensor is the most reliable, from all installed on japanese cars. The reliability is simply striking. But and his share has a lot of problems, mainly due to improper assembly. He is either broken down by the "nipple", and then seal with glue any passage of air, or the tightness of the supply tube is disturbed.

With this break, the fuel consumption increases, the level of CO in exhaust up to 3% increases. Very easy to observe the operation of the sensor on the scanner. The INTAKE Manifold line shows the discharge in the intake manifold, which is measured by the Mar sensor. When the entry wiring, the ECU registers the error 31. At the same time, the opening time of the injectors up to 3.5-5ms is sharply incremented And engine stop.

Knock sensor

The sensor is set to register detonation stuffs (explosions) and indirectly serves as a "corrector" of the ignition advance angle. The registering element of the sensor is Punoplastin. If the sensor malfunction, or the wiring break, on the passages over 3.5-4 tons. ECU turns fixes the error 52. It becomes intimidating when acceleration. You can check the performance by an oscilloscope, or, measuring, resistance between the sensor output and the housing (if there is resistance, the sensor requires replacement).

Crankshaft sensor
On the 7a series engines set the crankshaft sensor. An ordinary inductive sensor is similar to the ABC sensor, and practically sureless in operation. But confusions happen. With interstitious closure inside the winding, a disruption of the generation of pulses on certain revolutions occurs. This is manifested as a limit of engine speed in the range of 3.5-4 tons. Revolutions. A kind of cut-off, only on low revolutions. Detect the intersensile closure is quite difficult. The oscilloscope does not show a decrease in the amplitude of the pulses or the frequency change (during acceleration), and the tester notice the changes in the shares of Ohm is quite difficult. If the symptoms occur the revolutions limit on 3-4 thousand, simply replace the sensor on knowingly serviceable. In addition, a lot of trouble gives damage to the masterful crown, which damage the negligent mechanics, producing work on the replacement of the front oscillation of the crankshaft or the timing belt. To break the trunk of the crown, and restoring them with welding, it seems only the visible absence of damage. The crankshaft position sensor ceases to adequately read the information, the ignition advance angle begins to change chaotically, which leads to loss of power, unstable work Engine and increase fuel consumption

Injectors (nozzles)

With many years of operation, the nozzles and needles of the injectors are coated with resins and gasoline dust. All this naturally disrupts the correct spray and reduces the performance of the nozzle. With severe contamination, there is a tangible engine shaking, fuel consumption increases. Determine the accuracy really, by conducting gas analyzes, according to the testimony of oxygen in the exhaust, one can judge the correctness of the pouring. The testimony over one percent will indicate the need for washing injectors (when proper installation Timing and normal fuel pressure). Either by installing the injectors to the stand, and checking the performance in tests. The nozzles are easy to wash the laurel, Vince, both on installations for non-bleaching, and in ultrasound.

Idling valve, IACV

The valve is responsible for engine speed in all modes (heating, idling, load). During operation of the valve petal, the stem is contaminated and occurs. Turns hang on warming up either on H.H. (due to the wedge). Tests for changing revolutions in scanners during the diagnosis of this motor is not provided. You can estimate the performance of the valve by changing the temperature sensor readings. Enter the engine to "Cold" mode. Or, removing the winding from the valve, to twist over the valve magnet. Singing and wedge will be tangible immediately. If it is impossible to dismantle the valve winding (for example, on the GE series), it is possible to check its performance by connecting to one of the control outputs and measuring the diversity of the pulses at the same time controlling the turns of H.Kh. and changing the load on the engine. On a fully heated engine, the unit is approximately 40%, changing the load (including electrical consumers), you can estimate an adequate increase in revolutions in response to a change in duty. With a mechanical valve jamming, a smooth extension of the duty is occurring, not entailing the change in the revolutions of H.H. You can restore the work. Cleaning the Nagar and the dirt of the carburetor cleaner when the winding is removed.

Further adjustment of the valve is to install H.Kh. On a fully heated engine, rotating winding on the mounting bolts, achieve table revs for this type car (on the tag on the hood). After setting the E1-TE1 jumper into the diagnostic shoe. On more "young" engines 4a, 7a valve has been changed. Instead of the familiar two windings in the body of the valve winding, installed a chip. Changed the nutrition of the valve and the color of the winding plastic (black). It is noiencies to measure the resistance of windings on the conclusions. The valve is supplied and the control signal of the rectangular shape of the variable duty.

For the impossibility of removing the winding, a non-standard fastener was installed. But the problem of the wedge remained. Now, if you clean the usual cleaner, the lubricant is washed out of the bearings (the further result is predictable, the same wedge, but already due to the bearing). It is necessary to completely dismantle the valve from the throttle block and then wash the rod with petal carefully.

Ignition system. Candles.

A very large percentage of cars comes to service with problems in the ignition system. When operating on low-quality gasoline, the ignition candles suffer primarily. They are covered with a red raid (ferry). There will be no qualitative sparking with such candles. The engine will work with interruptions, with skipping, increases fuel consumption, the level of CO in the exhaust increases. Sandblasts are unable to clean such candles. Only chemistry will help (a couple of hours) or replacement. Another problem increases the gap (simple wear). Drying rubber tips high voltage wires, Water that fell when washing the motor, which all this provoke the formation of a conductive track on rubber tips.

Because of them, sparking will not be inside the cylinder, and outside it.
When smooth throttling, the engine works stably, and with a sharp - "crusher".

With this position it is necessary to replace both the candles and wires. But sometimes (in field conditions) If the replacement is impossible, you can solve the problem with a conventional knife and a piece of sandy stone (shallow fraction). I cut a knife with a conductive path in the wire, and with a stone remove the strip from the candle ceramics. It should be noted that it is impossible to remove the rubber band from the wire, this will lead to the complete inoperability of the cylinder.

Another problem is related to the wrong procedure for replacing candles. Wires with power are pulling out of the wells, pulling the metal tip of the occasion.

With such a wire, ignition skips and floating turns are observed. When diagnosing the ignition system, you should always check the ignition coil on the high-voltage discharge. The simplest check - on the engine running engine, see the spark on the discharge.

If the spark disappears or becomes a filamental - this indicates an intersless closure in the coil or on the problem in high-voltage wires. Cutting the wires check the test tester. Small wire 2-3k, further to an increase long 10-12.

The resistance of the closed coil can also be checked by the tester. The resistance of the secondary winding of the coil bit will be less than 12.
Next generation coils are not suffering such a few (4a.7a), their refusal is minimal. Proper cooling and wire thickness excluded this problem.
Another problem is the current seal in the distributor. Oil, falling on the sensors, corrosive insulation. And when exposed to high voltage, the slider is oxidized (covered with a green bloom). Corner zaks. All this leads to the breakdown of spar formation. In motion there are chaotic strips (in the intake manifold, in the muffler) and crushing.

« Thin "malfunctions
On the modern engines 4A, 7A Japanese changed the firmware of the control unit (apparently for faster engine warming). The change lies in the fact that the engine reaches the turns of H.X.This at a temperature of 85 degrees. Also changed the design of the engine cooling system. Now the small circle of cooling intensively passes through the block of the block (not through the nozzle behind the engine, as before). Of course, the cooling of the head became more effective, the engine in general became more efficient. But in winter, with this cooling, when moving, the temperature of the engine reaches a temperature of 75-80 degrees. And as a result, permanent warming turns (1100-1300), increased fuel consumption and nerve owners. You can fight this problem, or the engine is stronger than the engine, or by changing the resistance of the temperature sensor (deceiving the ECU).
Butter
The owners pour oil into the engine without a special parsing without thinking about the consequences. Few people understand that various types of oils are not compatible and for mixing form an insoluble porridge (coke), which leads to the complete destruction of the engine.

All of this plasticine cannot be washed into chemistry, it is cleaned only by mechanical way. It should be understood if the old oil is unknown, it should be used before changing. And another advice to the owners. Pay attention to the color of the handle oil affection. It is yellow. If the color of the oil in your engine darker color handles - it's time to replace, and not wait for the virtual mileage recommended by the manufacturer motor oil.

Air filter
The most inexpensive and easily accessible element - air filter. Owners very often forget about his replacement, without thinking about the likely increase in fuel consumption. Often, due to the scored filter, the combustion chamber is very polluted by oil burnt sediments, valve, candles are strongly polluted. Diagnosis can be mistakenly assumed that all wines siloslets Kolpacchkov, But the root cause is a scored air filter, which increases with dirt discharge in the intake manifold. Of course, in this case, the caps will also have to change.

Fuel filteralso deserves attention. If it does not replace it in time (15-20 thousand run) the pump begins to work with overload, pressure drops, and as a result, the need to replace the pump. Plastic impeller pump parts and check valve are prematurely wearing.

Pressure drops. It should be noted that the operation of the motor is possible at a pressure of up to 1.5 kg (with a standard 2.4-2.7 kg). Upon reduced pressure, there are permanent strips in the intake manifold Running problem (in terms of). The thrust is noticeably reduced. The pressure test is properly produced. (Access to the filter is not difficult). In the field, you can use the "pouring test from the return". If during the operation of the engine in 30 seconds from the gasoline, the gasoline is less than one liter flows, one can judge reduced pressure. It is possible for indirect determination of the pump performance to use an ammeter. If the current consumed by the pump is less than 4amper, then the pressure is seized. You can measure the current on the diagnostic shoe

When using the modern tool, the filter replacement process takes no more than half an hour. Previously, it took a lot of time. Mechanics always hoped in case they were lucky and the lower nozzle did not fit. But often it happened. I had to break my head with a long way to hook a rolling nut of the lower fitting. And sometimes the filter replacement process turned into a "film" with the removal of the tube applying to the filter.

Today, no one is afraid of this replacement.

Control block
Until 1998. year of releaseThe control blocks did not have enough serious problems when operating.

Repair blocks accounted for only because of the "hard ignition". It is important to note that all conclusions of the control unit are signed. It is easy to find the required output of the sensor to check, or the wire transversions. Details are reliable and stable at low temperatures.
In conclusion, I would like to stop a little on gas distribution. Many owners "with hands" procedure for replacing the belt are performed independently (although it is not correct, they cannot properly tighten the crankshaft pulley). Mechanics produce qualitative replacement Within two hours (maximum), when the belt belt is cut, the valves are not found with the piston and the fatal destruction of the engine does not occur. Everything is designed to smallest things.

We tried to tell about the most frequently arising problems on the engines of this series. The engine is very simple and reliable and subject to very tight operation on "water-iron gasolines" and dusty roads to our Great and Mighty Motherland and the "Avosny" mentality of the owners. All mockery, he still continues to delight his reliable and stable workBy won the status of the best Japanese engine.

All successful repairs.

"Reliable japanese engines" Notes car diagnostic

Toyotovsky power units of the series "A" were one of the best developments that companies allowed to get out of the crisis in the 90s of the last century. The largest volume was Motor 7A.

One should not be confused 7a and engine 7K. No related relationship these power aggregates do not have. DVS 7K was produced from 1983 to 1998 and had 8 valves. Historically, the "K" series began its existence in 1966, and the series "A" in the 70s. Unlike 7K, the engine series A developed as a separate direction of development 16 valve motors.

Engine 7 A has become a continuation of the improvement of 1600 cubic motor 4a-Fe and its modifications. The volume of the engine grew up to 1800 cm3, the power and torque increased, which reached 110 hp. and 156nm, respectively. The 7A FE engine was produced at the main production of Toyota Corporation from 1993 to 2002. The power units of the series "A" are still produced in some enterprises using licensed contracts.

Structurally, the power unit is made on the row scheme of the fuel gasoline with two up-to-ventilated distributive trealsAccordingly, the camshafts manage the operation of 16 valves. The fuel system is made injector with electronically controlled and rubbed ignition distribution. Driver timber belt. When the valve belt is cut, it is not bent. The head of the block is made in the same way as the head of the 4A series engine block.

Official options for the improvement and development of the power unit are not. Supplied with a single number-letter 7A-FE index for configuration different cars Up until 2002. The successor of the 1800 cubic drive appeared in 1998 and had 1zz index.

Constructive modifications

The engine received a block with an increased vertical size, the changed crankshaft, the head of the cylinders, increased the course of the pistons while maintaining the diameter.

The uniqueness of the design of the engine 7a is to use a two-layer metal laying of the block head and a two-circuit crankcase. The upper part of the crankcase, which was performed from the aluminum alloy, was attached to the block and the gearbox body.

The lower part of the crankcase was made of steel sheet, and allowed it to dismantle it, without removing the engine. Motor 7A has improved pistons. In the groove outlooking Ring 8 holes are made to drain oil into the crankcase.

The upper part of the fastener cylinder block is made in the same way. 4a-Fe is allowed to use the head of the cylinder block from a smaller motor. On the other hand, the blocks of the blocks are not entirely identical, since the diameters of the intake valves with 30.0 were changed on the 7 A series, and the diameter of the outlet valves is left unchanged.

In this case, other camshafts provide greater opening of intake and exhaust valves of 7.6 mm versus 6.6 mm per 1600 cubic engine.

Changes were made to the design of the exhaust manifold to attach WU-TWC converter.

Since 1993, the fuel injection system has changed on the engine. Instead of simultaneous injection into all cylinders, a pairwise injection began to apply. Changes were made to the settings of the gas distribution mechanism. Changed the opening phase of the outlet valves and the closing phase of intake and exhaust valves. What made it possible to increase power and reduce fuel consumption.

Until 1993, the engine starting system was used on the engines, which was used on the 4a series, but then, after finalizing the cooling system, refused to be refused. The engine control unit is left as the same, except for two additional options: The ability to test the system and detonation controls, which have been added to the ECD for a 1800 cubic engine.

Specifications and reliability

7a-Fe characteristics have met different. Motor had 4 versions. As a basic configuration, a motor capacity of 115 hp was produced. and 149 nm torque. SAMI powerful version DVS was produced for Russian and Indonesian markets.

She had 120 hp and 157 nm. For the American market, the "clamped" version was also produced, which was given only 110 hp, but with an increased to 156 nm torque. The weakest version of the engine squeezed 105 hp, as well as the 1.6 liter motor.

Part of the engines has the designation 7a Fe Lean Burn or 7a-Fe LB. This means that the engine is equipped with a depleted mixture combustion system, which first appeared on Toyota engines in 1984 and hidden under the T-LCS abbreviation.

Linben technology allowed to reduce fuel consumption by 3-4% when driving around the city and just over 10% when driving on the highway. But this, the system reduced the maximum power and torque, therefore evaluating the effectiveness of the use of this constructive refinement.

Engines equipped with LB, mounted on Toyota Karina, Caldina, Corona and Avensis. Corolla cars have never been completed with engines with such a fuel economy system.

In general, the force aggregate is quite reliable and not soared in operation. The resource before the first overhaul surpasses 300,000 km of run. During operation, attention must be paid electronic devicesserving engines.

The overall picture spoils the Linburn system, which is very arrogant to the quality of gasoline and has an increased cost of operation - for example, requires an ignition candle with platinum inserts.

Major faults

The main malfunctions of the engine operation are associated with the functioning of the ignition system. The splitting system of the spark is implied by wear of the bearings of the traver and gear gear. As wear is accumulated, it is possible to shift the moment of the spark that entails or to the ignition pass or to the loss of power.

Very demanding to clean high voltage wires. The presence of contaminants causes a sample of sparks on the outer part of the wire, which also leads to engine troop. Another cause of trimming is the wear or pollution of the spark plugs.

Moreover, the system is affected by the system and the NAGA, which is formed when using waterproof or iron-sulfur fuel, and the external contamination of the surfaces of the candles, which leads to a breakdown on the cylinder head housing.

The fault is eliminated by replacing candles and high-voltage wires included.

As a malfunction, engines equipped with the LEANBURN system are often recorded, in the 3000 rpm area. The fault occurs because there is no spark in one of the cylinders. Caused by usually wear platinum.

With a new high-voltage set, cleaning may require fuel system To eliminate contamination and restoring the injectors. If it does not help, then the malfunction can be found in the Esud block, which may require flashing or replacement.

The engine knock is due to the operation of the valves requiring periodic adjustment. (No less often 90,000 km). The piston fingers in the engines 7a are pressed, so the additional knock on this engine element is extremely rarely fixed.

Elevated oil consumption is laid constructively. The technical passport of the engine 7A FE indicates the possibility of natural flow to operate to 1 l of engine oil per 1000 km of mileage.

That and technical fluids

As recommended fuel, the manufacturer's plant indicates gasoline with an octane number of not lower than 92. The technological difference should be taken into account in determining the octane number of Japanese standards and the requirements of the GOST. It is possible to use non-determined 95 fuel.

Motor oil is selected by viscosity in accordance with the operating mode of the car and the climatic features of the region of operation. Most fully overlaps all possible conditions synthetic oil SAE 5W50 viscosity, however, for everyday average exploitation, there is enough viscosity oil 5W30 or 5W40.

For a more accurate definition, refer to the instruction manual. Capacity of the oil system is 3.7 liters. When replacing a filter change on the walls of the internal channels of the engine, up to 300 ml of lubricant can remain.

Engine maintenance is recommended to produce every 10,000 km of run. In case of severe operation, or using a car in highland, as well as at more than 50 engine launches at temperatures below -15С, it is recommended to reduce the service period by half.

The air filter changes as of state, but at least 30,000 km of mileage. The timing belt requires replacement regardless of its state every 90,000 km of run.

NB. When passing, it may require a reconciliation of a series of engine. The engine number must be located on a platform located in the rear of the engine under the outlet at the generator level. Access to this area is possible with a mirror.

Tuning and engine refinement 7A

The fact that the internal combustion engine was originally designed based on the 4a series, allows you to use a block of a block from a smaller engine and modify the 7A-FE motor up to 7a-GE. Such a replacement will give an increase of 20 horses. When performing such a finalization, it is also desirable to replace the original oil pump on the unit from 4A-GE, which has greater performance.

Turbization of the 7A series engines is allowed, but leads to a decrease in the resource. Special crankshafts and inserts for chance are not produced.

Toyota has created a new power unit based on 4a-Fe. Unlike the main model, the engine 7a has a more volumetric combustion chamber (1.8 instead of 1.6 liters), with other characteristics. This parameter reaches the maximum value when rotating the engine crankshaft at a speed of 2800 rpm. Due to the unique characteristics, the fuel economy is significantly saved, the efficiency increases, the car is quickly gaining speed. Drivers appreciated the advantages of the Toyota engine 7a when driving in difficult conditions of urban streets with traffic jams and frequent stops on traffic lights.

Engine 7A FE scope

As a result of successful test tests, as well as, thanks to a large number positive feedback Car owners, Japanese automakers decided to install this engine On the manufactured models of Toyota. Japanese engine 7A FE is widely used in the manufacture of cars class C:

• Avensis;
• Caldina;
• Carina;
• Carina E;
• Celica;
• Corolla / Conquest;
• Corolla;
• Corolla / Prizm;
• Corolla Spacio;
• Crown;
• Corona Premio;
• Sprinter Carib.

Car crown premium 1996 engine 7a

Premio - this is the second name of the first cars generation Toyota Crown produced earlier. To increase the number of sales, manufacturers went to change the interior design, appearance and names of branded cars. On the updated vehicle The engine is installed, which has an injection of D-4 direct type.

Engine specifications 7A FE

This motor was in production for several years, starting from 1990 to 2002.

1. The maximum power of the FE is 120 liters. from.
2. The volume of operating cylinders - 1762 cm3.
3. Developed torque - 157 N.MM when rotating crankshaft 4400 rpm.
4. Piston stroke length - 85.5 mm.
5. Cylinder radius - 40.5 mm.
6. The material of the cylinder block is a cast-iron alloy.
7. GBC heads - aluminum alloy.
8. System timing - DOHC.
9. Type of fuel - gasoline.

Features of the engine device 7a-Fe

In parallel with 7a-Fe, an engine with a marking 7a-Fe Lean Burn was created. The advantage of additional modification is its greatest efficiency. Gasoline is carefully mixed with oxygen in a variable intake manifold, which significantly improves the combustion efficiency of the fuel and air mixture.

Thanks to the action of systems electronic control, enrichment or depletion of mixtures in the specified parameters, which increases the engine efficiency. Judging by the numerous reviews of car owners equipped with 7A-FE Lean Burn, the engine has a record low fuel consumption.

The main differences between the new modifications of the engines 7a:

1. Applying a collector with dampers to adjust the degree of enrichment of fuel-air mixtures towards the decline.
2. The inclusion of the "poor regime" running the electronic system.
3. The location of the nozzles.
4. The use of special spark plugs with platinum spraying.

Excellent specifications and high economy 7A are provided by working on depleted fuel-air mixtures (LEAN BURN). Most often, the engines 7a can be found on Toyota models (Karina, Calin). In the design of the intake manifold, the so-called, "depleted" version 7a-Fe, special dampers are used, which change the amount of oxygen in the mixture during the operation of the power unit under normal conditions without increased loads. This marks a slight decrease in the engine power indicator, approximately 5 horse power, as well as improved environmental characteristics.

Using the electronic control system, the transition to the depleted mixture occurs in automatic mode. When the 7A-FE engine operates at idle, the electronics does not control the oxygen supply. Depending on the position of the ACT selector, electronic system The engine control quickly responds to the driver's control exposure and turns on / off the depletion mode.

The nozzles for the engine 7A-FE are opened alternately, serving each cylinder separately. They are bundled directly in the lid of the valve body.

Thanks to the inclusion in the design of this engine, the ignition system of the contactless type of DIS-2 has disappeared, the need to adjust the ignition angle. To this end, the electronics uses a detonation sensor.

For the successful ignition of the depleted mixture, the LEAN BURN device requires better sparking. When using gasoline inappropriate quality, a nagar layer is formed on the ignition candle. If the candles are closed, the motor begins to twitch, stuck both when driving and in idle mode. Toyota is decided to replace ordinary candles on platinum spraying products. To obtain a more powerful spark in the candle design, two electrodes having a clearance of 1.3 mm are also introduced.

Interestingly: It is noted that when working on Toyotovsky engines 7a-Fe on a merry Russian production, expensive platinum candles are covered with a raid, do not produce the promised potential. Instead of the expected 60,000 kilometers, they pass only 5,000. The output was found by folk craftsmen. They use conventional spark plugs without expensive spraying having a gap of 1.1 mm. Before installation, the electrodes by 1.3 mm simply extension, increasing the clearance to improve the spark. If you use a 1.1 mm clearance, the LEAN BURN system does not save gasoline, its flow rate increases significantly. Wizards advise installed candles ngk. BKR5EKB-11 with divorced electrodes instead of recommended NGK BKR5EKPB-13.

Toyota company produces engines of this modification designed for the regular fuel. This is gasoline japanese production, his octane number Corresponds to our unleaded AI-92. In contrast to the 92nd gasoline, the composition of AI-95 includes numerous additives, negatively affecting the spark plugs. Therefore, in the engine 7a-Fe it is recommended to fill gasoline AI-92.

Replacing the timing belt in the engine 7a Fe

The belt of the gas distribution mechanism of the 7A FE engine is designed to bring in motion and synchronization of rotation of the shafts - distribution and crankshaft. When it is cut, the cyclicity of the functions of the engine systems internal combustion Completely knocked down. In this case, there is a high probability of serious consequences leading to overhaul vehicle.

In order to save the internal combustion engine and the car as a whole, it is recommended to check the technical condition of the timing belt. If it occurs, it is replaced.

In accordance with the recommendations of the automaker, change the timing belt in the 7A FE engine is needed after a run of 100,000 kilometers. Considering the conditions of operation of cars on complex domestic roads, experienced motorists They advise this much earlier - in 80,000 km.

Thanks to a large number step-by-step instructionsPlaced on the Internet in the form of detailed videos, these activities can be performed independently in the conditions of the garage. The basic condition is accuracy and accurate observance of the order of operations.

Algorithm for replacing the belt:

1. Disconnect the battery terminals.
2. Remove spark plugs.
3. Remove the generator belt.
4. Valve lid.
5. Unscrew the fasteners of the top cover of the timing belt and remove it.
6. Carefully inspect the status of the belt, whether there are no cracks on its surface and other damage.
7. Remove the belt.
8. Simultaneously with the belt are removed: tension and bypass rollers that should not have damage.
9. If even the slightest scratches are noticed on the surfaces of the rollers, they are also subject to replacement.
10. amena components are made to new nodes. Selected parts of the engine parts 7A-FE.
11. Set new belt Timing, providing the necessary sagging.
12. When fixing bolts, the recommended tightening torque is applied.
13. Install the cover other nodes in the reverse sequence.

IMPORTANT: After connecting and tightening the battery terminals, it is desirable to leave a mark on top cover On the date of replacement of the timing belt and the number of kilometers traveled at this moment.

When developing the design of this engine is provided important moment - minimized the likelihood of a joint impact of pistons and valves with a possible breakpoint of the timing belt of the timing transmission mechanism. In this case, the possibility of bending valves is excluded. This significantly increases the level of reliability of the engine 7a.

Is the engine tuning possible - Toyota 7a Fe

To increase the dynamics of overclocking cars in the engine design, include a turbine. With the help of turbocharging the coefficient increases useful action The power unit, the car is better accepted from the spot. Such engine improvements will be useful with frequent trips through the city streets with complex conditions of movement in the Start Stop mode.

The development of engines of the series A in Toyota started in the 70s of the last century. It was one of the steps to reduce the fuel consumption, an increase in the efficiency, so all the series units were quite modest in volumes and facilities.

The Japanese achieved the good results of their work in 1993 by releasing the next modification of the A series of 7a-Fe. In essence, this unit was a slightly modified prototype of previous series, but it is rightly considered one of the most successful ICEs in the series.

Technical data

ATTENTION! Found a completely simple way to reduce fuel consumption! Do not believe? Auto mechanic with 15 years old also did not believe, until he tried. And now it saves 35,000 rubles per year in gasoline!

The volume of cylinders was increased to 1.8 liters. The engine began to issue 120 horsepower, which for such a volume a rather high indicator. The engine 7a-Fe characteristics are interesting in that the optimal torque is available from the lower revolutions. For urban ride, this is a real gift. And it also saves fuel, without scrolling the motor on the lower gears to high revolutions. In general, the characteristics look like this:

7A-FE under the hood Toyota Caldina

Highly interesting fact Is the existence of two types of engine 7a-Fe. In addition to ordinary power units, the Japanese have developed and actively promoted the market more economical 7a-Fe Lean Burn. By depletion of the mixture in the intake manifold, maximum efficiency is achieved. To implement the idea, it took the use of special electronics, which determined when it is necessary to dew the mixture, and when you need to run more than gasoline into the chamber. According to the reviews of car owners with such an engine, the unit has a reduced fuel consumption.

Features of operation 7a-Fe

One of the advantages of the engine design is that the destruction of such a node, as the timing belt 7a-Fe, is eliminated by the collision of the valves and the piston, i.e. In simple language, the engine does not oppress the valve. In essence, the engine is very hardy.

Some owners of advanced 7a-Fe units with a depleted mixture system say that electronics often behaves unpredictable. Not always, when you click on the accelerator pedal, the depletion system of the mixture is turned off, and the car behaves too calmly, or begins to twitch. The remaining problems arising from this force aggregate, have a private nature and are not massive.

Where did the 7A-FE engine installed?

The usual 7a-Fes were intended for C-class cars. After successfully starting the engine and good drivers, the concern began to establish the unit for the following cars:

Engine Toyota 7A-Fe 1.8 l.

Engine Characteristics Toyota 7A

Motor malfunction and repair 7a-Fe

The Toyota 7A engine is another variation on the basis of the main 4A motor, in which the short-proof crankshaft (77 mm) was replaced with the knee of 85.5 mm, respectively, the height of the cylinder block increased. Otherwise the same 4a-Fe.
Only one version of this engine was produced, it was 7A-Fe, depending on the setting, it was issued from 105 hp. up to 120 hp Weak version of 7a-Fe Lean Burn, it is not recommended to take, the system is a capricious and pretty road in service. Otherwise, the engine is similar to 4A and its diseases are the same: problems with a rubber, with sensors, a knock of piston fingers, a knock of valves that all forget to regulate on time and so on, full list trouble.
In 1998, to change 7a-Fe, came new engine , About him a separate mention.

Toyota 7A-Fe Engine Tuning

Chip tuning. Atmo

In the atmospheric version, as with, nothing sensible from the motor will not come out, you can crush the whole engine, to replace everything that changes, but it is completely meaningless. Some rationality has only turbocharging.

Turbine on 7a-Fe

You can put the turbine to the standard piston and blow up to 0.5 bar without problems, we need only suitable whale, or cook and collect it yourself. In addition to the turbine, you will need 360ss nozzles, Valbro 255 pump, exhaust on 51 pipes and setting up on abita or January 7.2, it will ride it, but not too long.