In the event that you are aware of abnormal symptoms on your vehicle, you are right to be preoccupied, because a car represents a massive annual budget and unpredicted breakdowns don’t reduce the expenses. So what if you feel like you have a leaking injector on your Mercedes Classe M? You most likely figured it out thanks to black/oily drips along your engine motor, or a disturbed idle, or strange black smoke. These three manifestations are the main signals of a leaking injector. As this failure can produce more significant engine problems on your car, we chose to produce this content page to help you ensure the failure of a leaking injector and deal with it correctly. To do so, we will first of all look into the circumstance of gasoline injectors and then at those of diesel injectors Mercedes Classe M.
Leaking injector on my petrol Mercedes Classe M
It is vital to know that the injectors on petrol and diesel engines are distinct, in fact, the difference in combustion between these two kind 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 M: The different leaks
It should be said that injector leaks on a Mercedes Classe M equipped with a petrol engine are rather infrequent. This is caused by 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 portion that is attached 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 M
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion procedure generates 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 M: The different leaks
In the circumstance of leaking diesel injectors on your Mercedes Classe M, there are three several kind of leaks:
- Leakage from the injector inlet:
In this instance, it is an inlet pipe that will deform along with time, 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 M 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 encourage you to consult this content page on the presence of oil leaking on your Mercedes Classe M.
Leaking injector on my Mercedes Classe M, how to fix the leak
And to finish, we’re going to look into how to fix a leaking injector on your car. Regularly a leak is connected, as we have seen previously, to a worn seal caused by the pressures suffered. But think that the pressure in the circuit is gigantic, especially on diesel engines. So you will have to take some measures:
- Lower the pressure before any work is conducted…
- Masking 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 limited to changing the seals that have failed:
- Identify the source of the leak
- Dismantle 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 specifically very hard, but if you have the smallest doubt in the treatment of your injector that leaks on your Mercedes Classe M, we encourage you to get closer to your motor mechanic to avoid any bad manipulation that could significantly harm the condition of your Mercedes Classe M.
To discover more tips on the Mercedes Classe M, take a look at the Mercedes Classe M category.
