In cases where you are informed of abnormal signs on your vehicle, you are right to be worried, because a car represents a big annual budget and surprising breakdowns don’t lower the bill. So what if you sense that you have a leaking injector on your Nissan Pathfinder? You almost certainly figured it out thanks to black/oily drips along your engine motor, or a disturbed idle, or unusual black smoke. These three symptoms are the main indicators of a leaking injector. As this troubles can end up in more significant engine trouble on your car, we decided to produce this content to help you confirm the failure of a leaking injector and deal with it properly. To accomplish this, we will first look into the circumstance of gasoline injectors and then at those of diesel injectors Nissan Pathfinder.
Leaking injector on my petrol Nissan Pathfinder
It is crucial 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 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 Nissan Pathfinder: The different leaks
It should be mentioned that injector leaks on a Nissan Pathfinder equipped with a petrol engine are rather infrequent. This is as a result of 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 plausible that you have a leak from the top of the injector, this is the portion 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 before.
Leaking injector on my diesel Nissan Pathfinder
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 Nissan Pathfinder: The different leaks
In the circumstance of leaking diesel injectors on your Nissan Pathfinder, there are three several kind of leaks:
- Leakage from the injector inlet:
In cases like this, it is an inlet pipe that will deform as time passes, 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 Nissan Pathfinder will be caused by 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 feel an air noise and a compression loss. - If after verifying you have oil leaking but it does not come from your injectors, we suggest you to browse this content on the existence of oil leaking on your Nissan Pathfinder.
Leaking injector on my Nissan Pathfinder, 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 associated, as we have seen prior to this, 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 safety measures:
- Lower the pressure before any work is completed…
- 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 swapping the seals that have failed:
- Identify the source of the leak
- Dismantle the injector in question
- Change 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 slightest doubt in the treatment of your injector that leaks on your Nissan Pathfinder, we suggest you to get closer to your motor mechanic to avoid any bad handling that could seriously harm the condition of your Nissan Pathfinder.
If you wish more tutorials on the Nissan Pathfinder, go to our Nissan Pathfinder category.
