In the event that you are aware of irregular signs on your automobile, you are right to be preoccupied, because a car represents a huge annual budget and sudden breakdowns don’t lower the bill. So what if you think that you have a leaking injector on your Renault Scenic? You almost certainly figured it out thanks to black/oily drips along your engine motor, or a troubled idle, or abnormal black smoke. These three manifestations are the main signals of a leaking injector. As this troubles can bring on more critical engine trouble on your car, we decided to compose this article to help you ensure the failure of a leaking injector and treat it properly. To do this, we will first of all take a look at the circumstance of gasoline injectors and then at those of diesel injectors Renault Scenic.
Leaking injector on my petrol Renault Scenic
It is crucial to know that the injectors on petrol and diesel engines are different, in reality, 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 Renault Scenic: The different leaks
It should be said that injector leaks on a Renault Scenic equipped with a petrol engine are rather rare. This is because of the much lower pressure in the petrol intake systems. Even so, 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 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 occur from the junction with the engine and not with the rail as seen previously.
Leaking injector on my diesel Renault Scenic
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion procedure produces 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 Renault Scenic: The different leaks
In the circumstance of leaking diesel injectors on your Renault Scenic, there are three different types of leaks:
- Leakage from the injector inlet:
In cases like this, it is an inlet pipe that will deform as time passes, commonly the leak will be at the clamping point. - Injector return leakage:
As its name reveals, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your Renault Scenic 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 experience an air noise and a compression loss. - If after checking you have oil leaking but it does not come from your injectors, we advise you to read this article on the presence of oil leaking on your Renault Scenic.
Leaking injector on my Renault Scenic, how to fix the leak
And at last, we’re going to take a look at how to fix a leaking injector on your car. Oftentimes a leak is connected, 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 monumental, specifically on diesel engines. So you will have to take some measures:
- Lower the pressure before any work is achieved…
- 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 oftentimes be limited to replacing the seals that have failed:
- Discover 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 very hard, but if you have the smallest uncertainty in the treatment of your injector that leaks on your Renault Scenic, we advise you to get closer to your auto technician to avoid any bad manipulation that could critically harm the condition of your Renault Scenic.
To discover more tips on the Renault Scenic, take a look at the Renault Scenic category.
