Detecting Common Rail Diesel Injectors Starting To Trouble

Detecting Common Rail Diesel Injectors Starting To Trouble – Fuel efficiency, both gasoline and diesel, is currently a priority for all countries. The reason is clear, this is because of the threat of a global energy crisis that has plagued the world. The impact of these demands is that the world’s automotive manufacturers must strive – if not independently – to innovate their combustion engines in order to achieve this goal.

One of the major innovations is the internal combustion engine for diesel. Currently, modern diesel engines generally have common rail technology. A technology that is conceptually the same as the old diesel engine, but from the point of view of applying electronic technology, it’s a completely different system.

Read more: 9 Main Causes of Common Rail Diesel Engine Difficult to Start

Detecting Common Rail Diesel Injectors Starting To Trouble

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In common rail diesel, the system will flow fuel through the fuel rail. From this fuel rail, the fuel will then go to each injector according to the F.O (firing order) sequence. Of course, the injector is directly connected to the combustion chamber in the cylinder.

Detecting Common Rail Diesel Injectors
The internal condition of common rail engine – Detecting Common Rail Diesel Injectors.

In the common rail, the fuel in the fuel rail has very high pressure. The average fuel pressure of various world automotive manufacturers can reach 2,000 bar. This high pressure aims to produce a good and even fuel mist. That’s why the common rail diesel engine injector is different from the conventional type.

Over time, common rail diesel injectors can also be damaged. To find out the indications that the common rail diesel injector has started to break, we can get it in various ways. In this case, we will mention two ways that are the most common workshops ever.

1. Lame and Unpowered Diesel Engine

The first way to detect a common rail diesel injector is to feel the power and engine speed. When the injector starts having problems, the engine will feel limp. Some cases mention the engine can also be powerless. Both can occur unilaterally, but can also occur simultaneously in a car.

Read more: Common Rail Diesel Fuel Injection Control System

Detecting in this way means there is no need to disassemble any engine parts. And for the record, the symptoms of a lame and unpowered engine can also be from other things. However, if damage does occur to the injector then it is clear the engine will be underpowered and tend to limp.

2. More fuel returns to the tank than enters the combustion chamber

The second way to detect the common rail injector is starting to fail is to do a test with SST. This way means we have to disassemble the injectors and have a common rail injector test kit. This is different from the injector (nozzle) test equipment for ordinary diesel engines. This SST is usually called the Common Rail Injection Test Bench.

Detecting Common Rail Diesel Injectors
Common Rail Injection Test Bench. Image source: IndiaMART

By using this tool we will know how much fuel comes out of the injector and how much returns to the tank. If the fuel that comes out of the injector is greater than what returns to the tank, the injector is in good condition. On the other hand, if there is less fuel coming out of the injector than returning to the tank, the injector is damaged. If the ratio is still small, the injector is still in the category we can use. But if the ratio is too large, we should service the injector.

The amount of fuel that returns to the tank is caused by a clogged valve in the injector due to the accumulation of residue. Usually, the residue comes from low-quality fuel. The residue will accumulate in each injector and will interfere with the flow of fuel out of the injector.

2 thoughts on “Detecting Common Rail Diesel Injectors Starting To Trouble

  1. Pingback: Important Parts of Common Rail Diesel Engines | Hi-tech for Future

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