If you are informed of unusual signs on your car, you are right to be concerned, because a car represents a big annual budget and sudden malfunctions don’t reduce the bill. So what if you sense that you have a leaking injector on your Mercedes Benz GLC Class? You almost certainly figured it out thanks to black/oily drips along your engine unit, or a disturbed idle, or unusual black smoke. These three symptoms are the main indicators of a leaking injector. As this troubles can bring on more critical engine complications on your car, we decided to publish this content page to help you confirm the failure of a leaking injector and treat it correctly. To achieve this, we will first take a look at the case of gasoline injectors and then at those of diesel injectors Mercedes Benz GLC Class.
Leaking injector on my petrol Mercedes Benz GLC Class
It is vital to know that the injectors on petrol and diesel engines are different, in fact, the difference in combustion between these two kind of engines makes the injection different. The biggest difference lies in the pressure undergone 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 GLC Class: The different leaks
It should be noted that injector leaks on a Mercedes Benz GLC Class equipped with a petrol engine are pretty rare. This is resulting from 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 component 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 encounter a leak coming from the lower portion of the injector of your car, this one will appear from the junction with the engine and not with the rail as seen previously.
Leaking injector on my diesel Mercedes Benz GLC 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 GLC Class: The different leaks
In the case of leaking diesel injectors on your Mercedes Benz GLC Class, there are three different kind of leaks:
- Leakage from the injector inlet:
In this instance, it is an inlet pipe that will deform over time, usually the leak will be at the clamping point. - Injector return leakage:
As its name indicates, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your Mercedes Benz GLC 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 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 verifying you have oil leaking but it does not come from your injectors, we advise you to read this content page on the existence of oil leaking on your Mercedes Benz GLC Class.
Leaking injector on my Mercedes Benz GLC Class, how to fix the leak
And to finish, we’re going to take a look at how to fix a leaking injector on your car. Regularly a leak is associated, as we have seen prior to this, to a worn seal because of the pressures suffered. But think that the pressure in the circuit is monumental, especially on diesel engines. So you will have to take some measures:
- Lower the pressure before any work is carried out…
- Masking you to avoid the risk of fuel spillage
- NEVER work on a running diesel engine injector.
Relating to the repair part of your leak, it will very often be limited 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 respect with the manufacturer’s standards.
In all cases, these interventions are not specifically very hard, but if you have the smallest hesitation in the treatment of your injector that leaks on your Mercedes Benz GLC Class, we advise you to get closer to your auto mechanic to avoid any bad manipulation that could critically harm the condition of your Mercedes Benz GLC Class.
If you need more tutorials on the Mercedes Benz GLC Class, go to our Mercedes Benz GLC Class category.
