In cases where you are informed of abnormal symptoms on your car, you are right to be intrigued, because a car represents a massive annual budget and surprising breakdowns don’t lower the costs. So what if you find that you have a leaking injector on your Mercedes Benz E Class? You probably figured it out thanks to black/oily drips along your engine, or a disturbed idle, or abnormal black smoke. These three symptoms are the main signs of a leaking injector. As this failure can bring about more significant engine problems on your car, we made a decision to prepare this article content to help you verify the failure of a leaking injector and handle it properly. To do this, we will first of all look into the case of gasoline injectors and then at those of diesel injectors Mercedes Benz E Class.
Leaking injector on my petrol Mercedes Benz E Class
It is vital to know that the injectors on petrol and diesel engines are different, actually, the difference in combustion between these two kind of engines makes the injection different. The essential difference lies in the pressure experienced by the injectors, on a petrol engine it will vary between 3.5 bars for indirect injection and 120 bars for indirect injection.
Leaking injector on a petrol Mercedes Benz E Class: The different leaks
It should be noted that injector leaks on a Mercedes Benz E Class equipped with a petrol engine are pretty rare. This is because of the much lower pressure in the petrol intake systems. Even so, there are two kind of leaks:
- Leakage from the top of the injector:
It is possible that you have a leak from the top of the injector, this is the portion that is attached to the fuel rail, an O-ring will be involved in this. - Leak injector of the lower part:
At last, you may suffer a leak coming from the lower part of the injector of your car, this one will come from the junction with the engine and not with the rail as seen before.
Leaking injector on my diesel Mercedes Benz E Class
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion system creates very high pressure in the engine, as do the injectors. On these models, the pressure is more than 10 times higher than on the direct injection of car petrol engines, reaching 1800 to 2000 bars.
Leaking injector on diesel Mercedes Benz E Class: The different leaks
In the case of leaking diesel injectors on your Mercedes Benz E Class, there are three different kind of leaks:
- Leakage from the injector inlet:
In this instance, it is an inlet pipe that will deform in the long run, commonly the leak will be at the clamping point. - Injector return leakage:
As its name implies, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your Mercedes Benz E Class will be caused by an O-ring or its plastic tip that leaks. - Injector base leak:
This injection leak is one of the most troublesome, it is the junction between the engine and the injector nose that leaks at a copper seal, you should feel an air noise and a compression loss. - If after checking you have oil leaking but it does not come from your injectors, we recommend you to read this article content on the presence of oil leaking on your Mercedes Benz E Class.
Leaking injector on my Mercedes Benz E Class, how to fix the leak
And finally, we’re going to look into how to fix a leaking injector on your car. Oftentimes a leak is connected, as we have seen previously, to a worn seal because of the pressures endured. But think that the pressure in the circuit is tremendous, specifically on diesel engines. So you will have to take some safety measures:
- Lower the pressure before any work is done…
- Covering you to avoid the risk of fuel spillage
- NEVER work on a running diesel engine injector.
Concerning the repair part of your leak, it will oftentimes be limited to swapping the seals that have failed:
- Locate the source of the leak
- Take apart the injector in question
- Replace the corresponding seal kit
- Reassemble the assembly and tighten with a torque wrench in accordance with the manufacturer’s standards.
In all situations, these interventions are not inevitably complicated, but if you have the slightest doubt in the treatment of your injector that leaks on your Mercedes Benz E Class, we recommend you to get closer to your auto technician to avoid any bad handling that could severely harm the condition of your Mercedes Benz E Class.
If perhaps you have any further questions about the Mercedes Benz E Class, do not hesitate to consult our Mercedes Benz E Class category.
