Have a question?
Its a common question; why change diesel injectors and how to tell when mine are worn?
So we got about answering it:
One of the most surprising things about common rail injectors is the work load that they are subjected to. The older injection systems operate around 1000 bar and inject once per combustion event. Modern Diesel Injection systems inject up to 5 times per combustion stroke and with anything up to 2200 bar!
The main way these injectors are able to deal with such massive work loads by they employing SUPER FINE Tolerances in order to promote best possible performance.
Unlike many years ago where a nozzle would simply wear out, metallurgical advancements have moved to such a point where the nozzles are now not really the issue. Whilst they do ‘wear’, its nothing like it used to be despite the much higher work loads.
So what does fail?
The most common failures we see here are Control piston and nozzle needle failures. These are the moving parts that dictate when and how the injector opens and starts injecting. The wear that we see is nearly always seizure related failures which can be due to excessive clearances (ie it worn out). However, its usually accelerated by either a lack of lubrication or physical particles coming through the fuel.
So lets take a look
a common reason why change diesel injectors; Lack of lubrication
BDG recommends the use of BP ultimate fuel. Its not just something we say but actually something we do as all our company vehicles have a BP fuel card. We suggest this as BP Ultimate is the only fuel guaranteed to meet Euro grade diesel standards including Cetane rating, lubricity and so on.
Another potential cause of the lack of lubrication can also be water getting through the trap and into the fuel system. Water has no lubrication and under extreme injection pressures does some pretty crazy things. This leads to a highly likely scenario where scoring occurs in moving parts inside the injector. Like a seized liner and piston, once it starts its only going to spread.
The water in the fuel also causes something else which I feel is the bigger issue – RUST.
Rust found inside common rail injectors
This is probably the bigger concern for common rail injection systems.
I actually believe there to be 2 main contributing factors, Rust and ‘Rubbish in the fuel’.
The rust can develop in the fuel rail or certain parts of the injector. After a while it will continue to grow and start to break off sections, which being after all of the filters, will go straight through the fuel system.
Why change diesel injectors? You’d want to see one of these issues:
Why change Diesel Injectors? There’s really only 2 reasons:
The post Why Change Diesel Injectors? appeared first on Baileys Diesel Group.
I hope you enjoy reading this blog post.
Baileys Diesel Group offers free tech support from qualified mechanics and an online store for all your diesel requirements including world-class diesel injectors for unparalleled performance, delivered Australia-wide.
I hope you enjoy reading this blog post.
Baileys Diesel Group offers free tech support from qualified mechanics and an online store for all your diesel requirements including world-class diesel injectors for unparalleled performance, delivered Australia-wide.
With over 48 years expertise and knowledge the Baileys Diesel Group is an industry world leader in diesel combustion efficiency and technology.
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