If you are informed of unusual signs on your vehicle, you are right to be concerned, because a car represents a massive annual budget and surprising breakdowns don’t lower the expenses. So what if you think that you have a leaking injector on your Infiniti QX50? You most likely figured it out thanks to black/oily drips along your engine motor, or a troubled idle, or unusual black smoke. These three manifestations are the main signs of a leaking injector. As this problem can lead to more critical engine trouble on your car, we thought we would publish this content to help you verify the failure of a leaking injector and deal with it properly. To do this, we will initially look into the circumstance of gasoline injectors and then at those of diesel injectors Infiniti QX50.
Leaking injector on my petrol Infiniti QX50
It is essential to know that the injectors on petrol and diesel engines are different, the reality is, the difference in combustion between these two types of engines makes the injection different. The essential 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 Infiniti QX50: The different leaks
It should be known that injector leaks on a Infiniti QX50 equipped with a petrol engine are pretty rare. This is due to 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 portion that is connected to the fuel rail, an O-ring will be involved in this. - Leak injector of the lower part:
At last, you may experience a leak coming from the lower portion of the injector of your car, this one will occur from the junction with the engine and not with the rail as seen before.
Leaking injector on my diesel Infiniti QX50
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion procedure 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 Infiniti QX50: The different leaks
In the circumstance of leaking diesel injectors on your Infiniti QX50, there are three several types of leaks:
- Leakage from the injector inlet:
In cases like this, it is an inlet pipe that will deform along with time, generally the leak will be at the clamping point. - Injector return leakage:
As its name reveals, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your Infiniti QX50 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 troublesome, it is the junction between the engine and the injector nose that leaks at a copper seal, you should encounter an air noise and a compression loss. - If after checking you have oil leaking but it does not come from your injectors, we recommend you to browse this content on the presence of oil leaking on your Infiniti QX50.
Leaking injector on my Infiniti QX50, how to fix the leak
And at last, we’re going to look into how to fix a leaking injector on your car. Very often a leak is associated, as we have seen previously, to a worn seal caused by the pressures suffered. But think that the pressure in the circuit is enormous, especially on diesel engines. So you will have to take some precautions:
- Lower the pressure before any work is done…
- 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 very often 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 set up and tighten with a torque wrench in respect with the manufacturer’s standards.
In all cases, these interventions are not specifically difficult, but if you have the smallest doubt in the treatment of your injector that leaks on your Infiniti QX50, we recommend you to get closer to your motor mechanic to avoid any bad handling that could seriously harm the condition of your Infiniti QX50.
To get more tips on the Infiniti QX50, take a look at the Infiniti QX50 category.
