Some GX7 engines are loud, is it a quality problem or an oil problem?

The yellow shell and Kunlun used in my EC7 before were all special oils, and the engine sound was really not small, but now I have changed to a blue shell, and the engine sound is better. View the original post

GX7 This is a common problem, all domestic machines are like this, and so is Geely!

Change to a better engine oil Add soundproof cotton in the engine cover.

There are many reasons for the loud engine sound, first of all, check whether it is caused by exhaust pipe leakage, if not, it may be caused by the engine itself or accessories.

1. Whether the oil is enough and whether it is suitable for this engine.

2. The bearing of one or more pulleys is abnormal.

3. There has been no high temperature or lack of oil before, which will cause the cylinder to be screwed, although it is not too affected, but the sound will become louder.

4. The valve sounds, and the valve clearance adjustment is not appropriate.

5. Three-way catalytic plugging or hollowing.

6. The iron sheet of the stent is broken or loose, and the resonance is abnormal.

7. The carbon collection is large, resulting in changes in compression ratio, gas mixture, deflagration, and detonation.

Xiao Qi's voice is indeed relatively loud, similar to Jeep, you go to the 4S store to have a look.

One like, mine is also big, the sleep of the big province, and the domestic production is like this.

There are many reasons why the engine is noisy, and it cannot be simply attributed to the engine oil, but if the engine oil alone has the following possible ways to improve the noise.

The type of viscosity index improver of the engine oil may be the cause of the noise, after the vehicle has traveled a certain distance, the viscosity of the poor quality viscosity improver is consumed, resulting in the viscosity of the oil at high temperatures, the viscosity decreases, the sealing becomes worse and the noise is generated.

Because of the design concepts of Japanese engines and European and American engines, as well as the different vehicle driving specifications of Japan and Europe, the design of engines is different, and the Japanese focus on fuel conservation, because the viscosity of engine oil is getting lower and lower, while the European and American engines focus on power, so the viscosity of engine oil is high.

So the amount of noise you mention depends on what kind of car you are and how many kilometers you drive.

In winter, the viscosity of the oil increases, which increases the resistance of the engine, which makes it difficult for the car to start coldly in the winter. The wear and tear caused by the engine at start is twice as high as usual, and the wear and tear caused by a cold start is equivalent to a normal driving of 150 kilometers. At such a critical moment, the oil must be injected into the engine from the sump quickly!

This requires the viscosity of the oil to be low enough. A good engine oil should flow quickly to the top of the engine within 1 second of ignition, and still provide the best protection for the engine even in low temperatures of minus twenty or thirty degrees. This requires the oil to remain viscous low enough at low temperatures, which is often not an easy task when the engine is still sufficiently viscous at high temperatures.

This is known as the viscosity index in lubricating oils. Generally speaking, the lower the viscosity and the higher the viscosity index, the better the oil will work.

There are many reasons for loud noise in the car, and engine oil is one of them. Lack of oil, mismatch of model, and failure to replace maintenance over the cycle will cause poor engine lubrication to varying degrees, thereby aggravating engine wear, and the noise of the engine will increase significantly. In addition, the interior noise may also be wind noise and tire noise, of which the wind noise is large in addition to the design reasons, should minimize any modification on the appearance, because this will destroy the vehicle drag coefficient of the car, and then affect the stability and quiet performance of the whole car in the aerodynamic range, wind noise also need to check the closure of windows, sunroofs and other positions.

Tire noise is usually related to tire selection and tire wear, the noise performance of tires with different patterns and widths is different, and the difference in use time will also cause a gap in noise performance.

Finally, after excluding the above reasons, you can try to strengthen the sound insulation and noise reduction treatment for the whole vehicle, mainly the engine compartment, four doors and the trunk position to install sound insulation material interlayer, pay attention to the selection of fire and temperature resistance level of sound absorption materials.

After the car changes the oil, the engine becomes louder?

If the engine of the car is loud, check whether it is caused by insufficient oil level.

What is the reason for the high noise of Geely engine Clean the oil circuit, the oil circuit is dirty after a long time, and it needs to be cleaned. When it's clean, it's burning, and when it's gone. 5000 kilometers can be used once with a Si Youpu fuel additive refueling tank.

Why does the engine noise become louder when the car has been driven for a long time? It only takes 2 minutes to find out why!

There are two possibilities.

First, if the oil is added, the instantaneous working resistance of the engine will increase, which will increase the rotational resistance of the crankshaft, reduce the output power of the engine, and excess oil will enter the combustion chamber to participate in combustion, resulting in the vehicle burning oil and blue smoke, resulting in increased fuel consumption.

Second, the oil model is wrong. For example, it used to be fully synthetic, but now it has been changed to mineral oil, so to change the engine oil, you must go to a regular store to change the ** engine oil, counterfeit or inferior engine oil is very damaging to the engine. The oil model recommended in the maintenance manual is basically no problem.

1. During the start of the engine, there should be no screaming sound in the starting motor; The engine idle speed "sudden sound" is uniform, and there is no abnormal noise; The idle speed is stable at about 850 rpm (please refer to the car manual for the specific stable idle value).

2. Gently step on the accelerator, let the engine speed slowly increase, there should be no noise in the process, individual models will have resonance phenomenon at a fixed speed, that is, the whole body shakes (if the resonance is very slight, does not cause discomfort in the ride, it should be normal), and the resonance phenomenon should be eliminated after the speed; When the engine speed exceeds the maximum power point speed, the sound is generally more noticeable, but there should be no metal friction sound.

3. Press the accelerator pedal quickly, and the sound of engine power improvement should be smooth and non-stuck; Carefully distinguish the sound of each engine speed. The main noise is: valve sound (generally "clicking" sound), if it is large, there is a suspicion of top valve; All kinds of belt rotation sounds (generally "squeak" sounds), if large, may be the belt and the body friction; If the engine emits other friction sounds, it is doubtful that the sudden sound is masked.

4. Find a suitable place, drive the vehicle according to the compound road conditions for 5-10 minutes, and the idle speed should still be stable at the original idle speed without change after stopping, and the sound should be the same as before.

5 Open the engine cover, listen to the sound on both sides of the engine, and at the same time move the accelerator control raft with your hands, and listen carefully to the engine sound according to the key points mentioned above.

The car engine is very loud and is oil, and if there is a problem with the filter, you can change the oil or clean the filter. The full name of engine filter is oil filter, and its function is to remove impurities such as dust, metal particles, carbon sediments and soot particles in the engine oil to protect the engine.

During the operation of the engine, metal abrasive debris, dust, oxidized carbon deposits at high temperatures, colloidal sediments, water, etc., are constantly mixed with the lubricating oil. The function of the oil filter is to filter out these mechanical impurities and gums, keep the lubricating oil clean, and extend its service life. The oil filter should have strong filtration capacity, low flow resistance, long service life and other properties.

Oil cooler.

The function of the oil cooler is to cool the lubricating oil and keep the oil temperature within the normal operating range. In high-power reinforced engines, oil coolers must be installed due to the high heat load. When the engine is running, the lubrication capacity is reduced as the viscosity of the oil thins out as the temperature increases.

Therefore, some engines are equipped with oil coolers, which are used to reduce the temperature of the oil and maintain a certain viscosity of the lubricating oil. The oil cooler is arranged in the circulating oil circuit of the lubrication system.