In the event that you are aware of unusual signs on your vehicle, you are right to be concerned, because a car represents a massive annual budget and unpredicted malfunctions don’t lower the bill. So what if you feel like you have a leaking injector on your Mercedes Classe B 2? You most likely figured it out thanks to black/oily drips along your engine, or a disturbed idle, or unusual black smoke. These three symptoms are the main signals of a leaking injector. As this troubles can lead to more significant engine problems on your car, we decided to prepare this content to help you confirm the failure of a leaking injector and deal with it correctly. To accomplish this, we will initially check out the case of gasoline injectors and then at those of diesel injectors Mercedes Classe B 2.
Leaking injector on my petrol Mercedes Classe B 2
It is fundamental to know that the injectors on petrol and diesel engines are different, the truth is, the difference in combustion between these two kind of engines makes the injection different. The key 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 B 2: The different leaks
It should be noted that injector leaks on a Mercedes Classe B 2 equipped with a petrol engine are pretty infrequent. This is because of the much lower pressure in the petrol intake systems. Nevertheless, 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 part that is linked to the fuel rail, an O-ring will be involved in this. - Leak injector of the lower part:
Finally, 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 previously.
Leaking injector on my diesel Mercedes Classe B 2
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 B 2: The different leaks
In the case of leaking diesel injectors on your Mercedes Classe B 2, there are three several kind of leaks:
- Leakage from the injector inlet:
In cases like this, 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 suggests, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your Mercedes Classe B 2 will be a consequence of 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 verifying you have oil leaking but it does not come from your injectors, we encourage you to consult this content on the existence of oil leaking on your Mercedes Classe B 2.
Leaking injector on my Mercedes Classe B 2, how to fix the leak
And finally, we’re going to check out how to fix a leaking injector on your car. Oftentimes a leak is connected, as we have seen previously, to a worn seal due to the pressures suffered. But think that the pressure in the circuit is monumental, specifically on diesel engines. So you will have to take some safety measures:
- Lower the pressure before any work is completed…
- Covering you to avoid the risk of fuel spillage
- NEVER work on a running diesel engine injector.
Regarding the repair part of your leak, it will oftentimes be restricted to changing the seals that have failed:
- Identify the source of the leak
- Dismantle the injector in question
- Change 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 difficult, but if you have the smallest uncertainty in the treatment of your injector that leaks on your Mercedes Classe B 2, we encourage you to get closer to your repair shop to avoid any bad manipulation that could significantly harm the condition of your Mercedes Classe B 2.
If you need more guides on the Mercedes Classe B 2, go to our Mercedes Classe B 2 category.
