In the event that you are informed of irregular signs on your automobile, you are right to be concerned, because a car represents a big annual budget and unexpected breakdowns don’t reduce the bill. So what if you find that you have a leaking injector on your Mercedes Classe E 4? You probably figured it out thanks to black/oily drips along your engine, or a troubled idle, or abnormal black smoke. These three signs of illness are the main indicators of a leaking injector. As this troubles can bring about more critical engine concerns on your car, we made a decision to produce this content to help you confirm the failure of a leaking injector and handle it correctly. To do so, we will initially look at the circumstance of gasoline injectors and then at those of diesel injectors Mercedes Classe E 4.
Leaking injector on my petrol Mercedes Classe E 4
It is fundamental to know that the injectors on petrol and diesel engines are distinct, in fact, the difference in combustion between these two types of engines makes the injection distinct. The main 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 Classe E 4: The different leaks
It should be known that injector leaks on a Mercedes Classe E 4 equipped with a petrol engine are rather infrequent. This is because of the much lower pressure in the petrol intake systems. Nevertheless, there are two types of leaks:
- Leakage from the top of the injector:
It is plausible that you have a leak from the top of the injector, this is the part 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 appear from the junction with the engine and not with the rail as seen sooner.
Leaking injector on my diesel Mercedes Classe E 4
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion procedure produces 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 Classe E 4: The different leaks
In the circumstance of leaking diesel injectors on your Mercedes Classe E 4, there are three different types of leaks:
- Leakage from the injector inlet:
In cases like this, it is an inlet pipe that will deform as time passes, usually the leak will be at the clamping point. - Injector return leakage:
As its name indicates, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your Mercedes Classe E 4 will be the result of an O-ring or its plastic tip that leaks. - Injector base leak:
This injection leak is one of the most annoying, it is the junction between the engine and the injector nose that leaks at a copper seal, you should experience an air noise and a compression loss. - If after checking you have oil leaking but it does not come from your injectors, we suggest you to browse this content on the presence of oil leaking on your Mercedes Classe E 4.
Leaking injector on my Mercedes Classe E 4, how to fix the leak
And finally, we’re going to look at how to fix a leaking injector on your car. Regularly a leak is linked, as we have seen prior to this, to a worn seal due to the pressures endured. But think that the pressure in the circuit is monumental, especially on diesel engines. So you will have to take some safety measures:
- Lower the pressure before any work is done…
- Masking 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 frequently be restricted to changing the seals that have failed:
- Situate the source of the leak
- Take apart the injector in question
- Replace the corresponding seal kit
- Reassemble the set up and tighten with a torque wrench in accordance with the manufacturer’s standards.
In all situations, these interventions are not automatically very hard, but if you have the smallest doubt in the treatment of your injector that leaks on your Mercedes Classe E 4, we suggest you to get closer to your mechanic to avoid any bad manipulation that could seriously harm the condition of your Mercedes Classe E 4.
If you need more guides on the Mercedes Classe E 4, go to our Mercedes Classe E 4 category.
