In cases where you are informed of abnormal signs on your car, you are right to be preoccupied, because a car represents a huge annual budget and unpredicted malfunctions don’t lower the expenses. So what if you feel like you have a leaking injector on your Infiniti M? You likely figured it out thanks to black/oily drips along your engine unit, or a troubled idle, or strange black smoke. These three manifestations are the main indicators of a leaking injector. As this failure can cause more serious engine trouble on your car, we thought we would prepare this article content to help you verify the failure of a leaking injector and treat it properly. To accomplish this, we will initially look at the case of gasoline injectors and then at those of diesel injectors Infiniti M.
Leaking injector on my petrol Infiniti M
It is important to know that the injectors on petrol and diesel engines are distinct, actually, the difference in combustion between these two types of engines makes the injection distinct. The essential 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 M: The different leaks
It should be said that injector leaks on a Infiniti M equipped with a petrol engine are pretty infrequent. This is as a result of the much lower pressure in the petrol intake systems. However, 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 component that is linked 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 occur from the junction with the engine and not with the rail as seen previously.
Leaking injector on my diesel Infiniti M
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 Infiniti M: The different leaks
In the case of leaking diesel injectors on your Infiniti M, there are three different types of leaks:
- Leakage from the injector inlet:
In this case, it is an inlet pipe that will deform along with time, in most cases the leak will be at the clamping point. - Injector return leakage:
As its name implies, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your Infiniti M will be a consequence 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 find 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 consult this article content on the presence of oil leaking on your Infiniti M.
Leaking injector on my Infiniti M, how to fix the leak
And finally, we’re going to look at how to fix a leaking injector on your car. Frequently a leak is connected, as we have seen previously, to a worn seal as a result of the pressures suffered. But think that the pressure in the circuit is tremendous, specifically on diesel engines. So you will have to take some measures:
- 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.
Concerning the repair part of your leak, it will very often be restricted to swapping the seals that have failed:
- Find the source of the leak
- Take apart 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 cases, these interventions are not specifically complicated, but if you have the tiniest doubt in the treatment of your injector that leaks on your Infiniti M, we recommend you to get closer to your auto mechanic to avoid any bad handling that could significantly harm the condition of your Infiniti M.
If you want more tutorials on the Infiniti M, go to our Infiniti M category.
