Mitsubishi 6G73 engine
Content
This is the smallest engine of the Cyclone family. They began to produce a motor in 1990, production continued until 2002. The power plant had smaller cylinders than on the 6G71, 72, 74 and 75 counterparts.
Description
The compact 6G73 is equipped with 83,5 mm cylinders. This is 7,6 mm less than other versions.
Now the details.
- The compression ratio initially provided for 9,4, then was increased to 10, and after the introduction of the GDI system - up to 11.
- The cylinder head was originally with a single SOHC camshaft. On the upgraded version of the 6G73, two DOHC camshafts were already used.
- Valves in the amount of 24 pieces. They are equipped with hydraulic lifters. The size of the intake valves is 33 mm, exhaust - 29 mm.
- The power of the power plant was 164-166 liters. s., then in the process of chip tuning it was brought to 170-175 hp. With.
- On later modifications of the engine, the GDI direct injection system was used.
- The timing drive is a belt that needs to be replaced every 90 thousand kilometers of the car. At the same time, the tension roller and pump must be replaced.
6G73 engines were installed on Chrysler Sirius, Sebring, Dodge Avenger and Mitsubishi Diamant. More details in the table.
| Winemaking | Kyoto engine plant |
|---|---|
| Engine make | 6G7/Cyclone V6 |
| Years of issue | 1990-2002 |
| Cylinder block material | cast iron |
| Supply system | injector |
| A type | V-shaped |
| Number of cylinders | 6 |
| Valves per cylinder | 4 |
| The piston stroke, mm | 76 |
| Cylinder diameter, mm | 83.5 |
| Compression ratio | 9; ten; 10 (DOHC GDI) |
| Engine displacement, cc | 2497 |
| Engine power, hp / rpm | 164-175/5900-6000; 200/6000 (DOHC GDI) |
| Torque, Nm / rpm | 216-222/4000-4500; 250/3500 (DOHC GDI) |
| Fuel | 95-98 |
| Engine weight, kg | ~ 195 |
| Fuel consumption, l/100 km (for Galant) | |
| - town | 15.0 |
| - track | 8 |
| - funny. | 10 |
| Oil consumption, gr. / 1000 km | to 1000 |
| Engine oil | 0W-40; 5W-30; 5W-40; 5W-50; 10W-30; 10W-40; 10W-50; 10W-60; 15W-50 |
| How much oil is in the engine, l | 4 |
| Oil change is carried out, km | 7000-10000 |
| Engine operating temperature, deg. | ~ 90 |
| Engine resource, thousand km | |
| - according to the plant | — |
| - on practice | 400+ |
| Tuning, h.p. | |
| - potential | 300+ |
| - without loss of resource | — |
| The engine was installed | Mitsubishi Diamante; Dodge Stratus; Dodge Avenger; Chrysler Sebring; Chrysler Cirrus |
Engine problems
6G73 engine problems are almost the same as those found on models of the 6-cylinder family of units. The life of the motor can be extended if regular high-quality maintenance is carried out. It is extremely important to use high quality consumables: oil, fuel, spare parts.
big zhor oil
Any engine consumes a certain amount of oil. This is normal, as a small part of the lubricant is burned during the operation of the engine. If the consumption is increased much, this is already a problem. Most often it is associated with valve stem seals and rings. Replacing the elements will help correct the situation.
The oil scraper kit wears out as the engine is used. Rings are installed on the pistons, one for each. Their purpose is to protect the cylinders from getting inside the lubricant. They are always in contact with the walls of the combustion chamber, so they constantly rub and wear out. Gradually, the gaps between the rings and the walls increase, and through them the lubricant enters the combustion chamber. There, the lubricant burns safely along with gasoline, then exits in the form of black smoke into the muffler. Experienced owners of this symptom determine increased oil consumption.
Rings can also stick when the engine starts to boil. The original characteristics of the elements installed in their seats are lost. It will be possible to determine the problem by the blue smoke from the muffler.
However, worn rings are not the only cause of increased oil consumption.
- A large zhor may be associated with wear on the cylinder walls. This also happens over time, and oil in large quantities enters through the gaps into the combustion chamber. The problem is eliminated by boring the cylinder block or by a banal replacement.
- As mentioned above, increased oil consumption can be associated with caps. These are a special type of oil seals made of materials that can withstand high temperatures well. Due to heavy wear, the rubber seal may lose its characteristics and elasticity. The result is leakage and increased consumption. To replace the caps, it is enough to remove the cylinder head - it is not necessary to dismantle the entire engine.
- Head gasket. It also tends to dry out over time, as it is made of rubber. For this reason, cylinder head gasket damage is more common on used vehicles. On new machines, this problem is only possible if the bolts are loose. It may be necessary to replace them or fix them with a large tightening torque.
- Crankshaft seals are also often squeezed out due to excessive wear, low temperatures, or poor-quality lubricant being poured into the engine. You will have to carry out a major replacement of all seals.
- If the 6G73 engine has been turbocharged, oil leaks can increase significantly. In particular, the bushing of the compressor rotor wears out, and the oil system can generally be completely empty. Obviously, the engine will start to work worse, and the first thing to do is test the functioning of the rotor.
- Lubricant can also leak through the oil filter. A characteristic feature is spots and smudges under the car. The reason in this case must be sought in a weak tightening of the filter housing or its damage.
- A damaged cylinder head cover also causes a leak. It may develop cracks.
Engine knock
First of all, owners of cars with a knocking engine are interested in the question of how much more you can drive, and how difficult the repair will be. If the malfunction is related to hydraulic lifters, then you can operate the engine for some more time. Cranking the connecting rod bearings is already a dangerous signal that requires a major overhaul. Noise can be associated with other details, all this requires a more detailed check.
In the vast majority of cases, the knock in the motor begins in the area of \uXNUMXb\uXNUMXbconjugation of the elements, when the gap is greater than normal. And the more extensive it is, the more clearly you can hear the blows of one part on another. Noise is caused by high loads at the impact points of the internal components of the power plant. It is obvious that constant blows will sooner or later destroy important elements of the engine. The higher the load and the greater the impact force, the faster this will happen.
In addition, the speed of the process is affected by the design of the material, lubrication and cooling conditions. For this reason, some parts of the power unit are able to work in a worn state for quite a long time.
Knocks on a "cold" engine are different from knocks on a "hot" one. In the first case, there is no reason for urgent repairs, since the noise disappears as the elements of the power plant warm up. But knocks that do not disappear with warming up are already a reason for an urgent trip to a car repair shop.
Unstable turnover
We are talking about unstable revolutions in XX mode. As a rule, the regulator or throttle valve becomes the cause of the malfunction. In the first case, you need to replace the sensor, in the second - cleaning the damper.
The car's tachometer makes it possible to identify problems with engine speed. During normal operation of the unit at XX, the arrow of the device is kept at the same level. Otherwise, it behaves unstable - it falls, then rises again. The range jumps within 500-1500 rpm.
If there is no tachometer, then the speed problem can be identified by ear - the roar of the engine will decrease or increase. Also, the vibrations of the power plant can weaken or increase.
It is noteworthy that motor jumps can appear not only on the twentieth. At intermediate modes of operation of the internal combustion engine, dips or rises of the tachometer are also recorded.
Unstable speed 6G73 can also be associated with faulty spark plugs. To protect yourself from possible problems as much as possible, it is recommended to always pour high-quality oil into the engine. You should not refuel with cheap gasoline, as imaginary savings can lead to significant expenses associated with the repair or replacement of internal combustion engines.
How to fix unstable rpm
| Fault type | Solution |
|---|---|
| Air leaks into the engine cylinders | Check the tightness of the air supply pipes to the intake manifold. It is not necessary to remove each hose individually, because this is a laborious process. It is enough to treat the tubes with the composition of VD-40. Where the "vedeshka" quickly evaporates, a crack will immediately show up. |
| Replacing the idle speed regulator | The state of the IAC is checked with a multimeter, which we measure its resistance. If the multimeter shows a resistance in the range from 40 to 80 ohms, then the regulator is out of order and will have to be replaced. |
| Cleaning the crankcase ventilation valve | You will have to disassemble the oil sump - this will make it possible to get to its ventilation and remove the valve, which must be washed in diesel fuel or any means to clean engine parts from traces of oil sludge. Then dry the valve and put it back. |
| Mass Air Flow Sensor Replacement | DMRV is a sensor that in most cases cannot be repaired. So if it was he who became the cause of the floating idle speed, it is better to replace it rather than repair it. Moreover, it is impossible to fix a failed hot-wire anemometer. |
| Flushing the throttle valve and then installing it in the correct position | There are two ways to clean the DZ from oil deposits - with and without removal from the machine. In the first case, you will have to throw off all the attachments that lead to the damper, loosen the latches and remove. Then put the DZ in an empty container and fill it with a special aerosol (for example, Liqui Moly Pro-line Drosselklappen-Reiniger). |
Tuning
Alteration 6G73 is not very popular. This is easy to explain - the engine is dead-end, without potential. It's easier to just buy a contract 6G72 and make a bead tap or a stroker.
Find it
To get started, you need to have the following:
- direct cooler (intercooler);
- blow-off;
- electronic control unit AEM;
- boost controller;
- fuel pump from Toyota Supra;
- fuel regulator Aeromotive.
Engine power in this case can be increased to 400 liters. With. You will also have to modify the turbines, install a new Garrett compressor, replace the nozzles and modify the cylinder head.
Stroker
Also an option to increase engine power. A ready-made stroke kit is bought, which increases the volume of the engine. The purchase of a cylinder block from 6G74, the installation of new 93 mm forged pistons or their boring will continue the modernization.
It should be noted that only turbocharged versions are recommended for tuning. Atmospheric motors are not worth the cost, so it is much more profitable to replace the 6G73 with a 6G72, and then start refining.
The 6G73 engine can be called a fairly reliable and powerful unit. True, only on condition that it will be equipped only with original (high-quality) spare parts and consumables. This engine is very picky about fuel, you only need to fill in high-octane gasoline.
