Whenever you are aware of unusual signs on your vehicle, you are right to be preoccupied, because a car represents a massive annual budget and unpredicted malfunctions don’t reduce the expenses. So what if you feel like you have a leaking injector on your Mercedes Benz S Class? You most likely figured it out thanks to black/oily drips along your engine motor, or a disturbed idle, or unusual black smoke. These three signs of illness are the main symptoms of a leaking injector. As this troubles can cause more significant engine trouble on your car, we chose to compose this article to help you verify the failure of a leaking injector and handle it properly. To accomplish this, we will first of all check out the case of gasoline injectors and then at those of diesel injectors Mercedes Benz S Class.
Leaking injector on my petrol Mercedes Benz S 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 types of engines makes the injection different. The biggest 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 S Class: The different leaks
It should be known that injector leaks on a Mercedes Benz S Class equipped with a petrol engine are rather infrequent. This is resulting from 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 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:
At last, you may suffer a leak coming from the lower portion 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 Benz S Class
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion system 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 Benz S Class: The different leaks
In the case of leaking diesel injectors on your Mercedes Benz S Class, there are three different types 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 concerns the management of the fuel return in the injector, this time the injector that leaks on your Mercedes Benz S Class 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 feel an air noise and a compression loss. - If after checking you have oil leaking but it does not come from your injectors, we encourage you to browse this article on the existence of oil leaking on your Mercedes Benz S Class.
Leaking injector on my Mercedes Benz S Class, how to fix the leak
And finally, we’re going to check out how to fix a leaking injector on your car. Very often a leak is linked, as we have seen sooner, to a worn seal caused by the pressures endured. But think that the pressure in the circuit is monumental, specifically on diesel engines. So you will have to take some precautions:
- 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.
Relating to the repair part of your leak, it will regularly be limited to swapping the seals that have failed:
- Locate the source of the leak
- Dismantle the injector in question
- Replace the corresponding seal kit
- Reassemble the set up and tighten with a torque wrench in respect with the manufacturer’s standards.
In all cases, these interventions are not automatically complicated, but if you have the smallest hesitation in the treatment of your injector that leaks on your Mercedes Benz S Class, we encourage you to get closer to your auto technician to avoid any bad handling that could significantly harm the condition of your Mercedes Benz S Class.
If you have any further questions about the Mercedes Benz S Class, do not hesitate to consult our Mercedes Benz S Class category.
