Reasons and solutions for stuck fuel injector of diesel generator set

As we all know, the fuel injector is one of the three pairs of delicate parts of the diesel engine fuel supply system. After a diesel generator set has been used for a period of time, the fuel injector will often become stuck due to improper operation or insufficient maintenance. What is the reason why the diesel engine injector is easy to get stuck, and what methods can be used to solve this problem? Haixing Dynamics would like to give you a brief introduction.

one,Diesel generator setAnalysis of the causes of stuck fuel injector

1. The diesel oil is not clean, there are impurities in the high-pressure oil pipe, and the needle valve coupling of the injector is worn, causing the needle valve coupling to be laxly closed, causing high-pressure gas to flow back in the combustion chamber and burning out the needle valve coupling. In addition, the dirt on the injector pressure regulating spring, tappet and other parts has moved to the upper part of the injector needle valve through the injector tappet, or the cotton rope and lead wire used to prevent oil leakage on the oil line have entered through the high-pressure oil pipe. The fuel injector will cause the needle valve assembly to become stuck.

2. The machine temperature is too high and the injector is not cooled well, causing the ground valve parts to get stuck. The oil supply time is too late, the cooling water channel has too much scale or is blocked, the water pump impeller end face is worn, the engine is overloaded for a long time, etc., which will cause the engine to overheat.

3. The outlet valve is worn, causing the injector to drip oil when it stops injecting fuel, causing the injector nozzle to burn coke and accumulate carbon, resulting in jamming.

4. The spray pressure is too low, causing high-pressure gas to flow back in the combustion chamber;

5. When installing the injector, the gasket is missing or damaged, causing air leakage, causing the injector part to become overheated and stuck.

6. Reasons in parts manufacturing, such as the injector installation hole on the cylinder head is too tight with the injector, the gap between the needle valve body and the installation hole on the cylinder head is too small, the injector installation hole on the cylinder head is processed too deep, etc. .

2. Solution to the stuck fuel injector of diesel generator set Copyright by:www.hxdlkj.com

First put the stuck fuel injector into diesel or engine oil to heat it, then take it out and wrap it with a cloth, then clamp the needle valve with pliers and move it slowly to remove the needle valve from the needle valve body. Drop a small amount of clean engine oil into the needle valve body and allow the needle valve to move repeatedly in the needle valve body until the needle valve can move freely in the needle valve body. If there are traces of burns on the sealing surface of the needle valve, it should be ground with abrasive paste. When grinding, pay attention to the amount of grinding paste and grinding time. Install the clean bell valve assembly onto the fuel injector and adjust the fuel injection pressure before using it again.

The above is Haixing Power’s analysis and solutions to the causes of stuck injectors of diesel engine units. Therefore, in daily work, it is necessary to perform daily cleaning and inspection work on the diesel generator set to extend the service life of the diesel generator set and enable the diesel generator set to be put into work.