In cases where you are alert of irregular signs on your vehicle, you are right to be worried, because a car represents a huge annual budget and unforeseen breakdowns don’t lower the costs. So what if you feel like you have a leaking injector on your Infiniti QX60? You most likely figured it out thanks to black/oily drips along your engine, or a troubled idle, or unusual black smoke. These three signs of illness are the main indicators of a leaking injector. As this failure can bring on more serious engine problems on your car, we thought we would compose this content page to help you validate the failure of a leaking injector and deal with it properly. To accomplish this, we will first look into the case of gasoline injectors and then at those of diesel injectors Infiniti QX60.
Leaking injector on my petrol Infiniti QX60
It is fundamental 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 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 Infiniti QX60: The different leaks
It should be mentioned that injector leaks on a Infiniti QX60 equipped with a petrol engine are rather rare. This is due to the much lower pressure in the petrol intake systems. However, there are two kind of leaks:
- Leakage from the top of the injector:
It is conceivable 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 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 Infiniti QX60
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 Infiniti QX60: The different leaks
In the case of leaking diesel injectors on your Infiniti QX60, 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 suggests, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your Infiniti QX60 will be brought on 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 encounter an air noise and a compression loss.
- If after examining you have oil leaking but it does not come from your injectors, we encourage you to read this content page on the presence of oil leaking on your Infiniti QX60.
Leaking injector on my Infiniti QX60, 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 connected, as we have seen prior to this, to a worn seal due to the pressures suffered. But think that the pressure in the circuit is tremendous, especially on diesel engines. So you will have to take some precautions:
- 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.
Relating to the repair part of your leak, it will frequently be restricted to replacing the seals that have failed:
- Find out 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 automatically very hard, but if you have the slightest hesitation in the treatment of your injector that leaks on your Infiniti QX60, we encourage you to get closer to your mechanic to avoid any bad handling that could severely harm the condition of your Infiniti QX60.
If you need more guides on the Infiniti QX60, go to our Infiniti QX60 category.