How to clean up the carbon deposit on the valve of direct injection engine

There are several ways to remove carbon deposits from valves of direct injection engines:

First, La expressway.

Pulling high speed is pulling high speed. Its theoretical basis is to keep the engine running at high speed and crush the carbon deposit. At the same time, relatively high intake and exhaust pressure is maintained, and high speed promotes more intake and exhaust. This can wash away the newly generated carbon deposits that are not completely attached to the surface of the cylinder block. But it has little effect on cleaning carbon deposits produced for a long time.

Second, openness and cleanliness.

Disassembly cleaning is to clean the valve by completely disassembling the engine. After the engine is removed, the carbon deposit in the valve chamber can be scrubbed clean. Suitable for deep cleaning when carbon deposition is very serious.

Third, the fuel cleaning agent

Adding fuel system cleaning agent and gasoline to the fuel tank can clean the carbon deposit and oil circuit for the engine anytime and anywhere. This method can not only remove carbon deposit, but also improve oil products and prevent the formation of carbon deposit and colloid.

Four, infusion bag or infusion bottle cleaning

The specific steps of bottle washing are as follows:

1. Prepare to clean the special infusion bottle, and inject the atomized detergent into the infusion bottle, as shown in the following figure.

2. Unplug the end of the fuel main pipe connected to the engine, and plug in the "hanging bottle" to connect the black pipe of the fuel filter.

3. Connect the equipment that provides pressure for the infusion bottle, and open the valve below.

4. Start the engine, adjust the pressure provided by the pressure equipment to 60-80 kg/cm ㎡, and let the engine run at idle speed for cleaning 15-20 minutes.

5. After cleaning, loosen the bottle mouth to release the pressure and let the car return to its original state.

6. Put the throttle in neutral position or drive at high speed on an open road for a few minutes, so that the cleaning agent can achieve sufficient cleaning effect, and discharge the cleaned sundries through the exhaust pipe.

Extended data:

Diagnostic method of carbon deposition

In automobile maintenance, to diagnose whether there is carbon deposit in the intake pipe, you only need to remove the throttle valve, and you can clearly see the degree of carbon deposit. There are two diagnostic methods for valve carbon deposition.

1, disintegration method

Disassemble the engine and check whether there is carbon deposit. This is intuitive, but it is time-consuming and laborious, and disassembling automobile parts many times will affect its performance and shorten its service life.

2. Endoscopy

Remove the spark plug or nozzle and observe the degree of carbon deposition in the valve with an endoscope. This method is very convenient, but the cost of endoscope is high and it is not widely used in maintenance, so not all maintenance enterprises are equipped with this equipment.

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