In the event you are alert of irregular signs on your car, you are right to be concerned, because a car represents a big annual budget and sudden breakdowns don’t reduce the expenses. So what if you find that you have a leaking injector on your Renault Scenic 4? You probably figured it out thanks to black/oily drips along your engine motor, or a troubled idle, or unconventional black smoke. These three manifestations are the main signs of a leaking injector. As this problem can bring on more severe engine complications on your car, we thought we would prepare this content to help you validate the failure of a leaking injector and deal with it properly. To do so, we will first look at the circumstance of gasoline injectors and then at those of diesel injectors Renault Scenic 4.

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Leaking injector on my petrol Renault Scenic 4

It is vital to know that the injectors on petrol and diesel engines are distinct, in reality, the difference in combustion between these two kind of engines makes the injection distinct. The biggest 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 Renault Scenic 4: The different leaks

It should be known that injector leaks on a Renault Scenic 4 equipped with a petrol engine are rather rare. This is resulting from 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 part that is attached 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 come from the junction with the engine and not with the rail as seen previously.

Leaking injector on my diesel Renault Scenic 4

Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion system 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 4: The different leaks

In the circumstance of leaking diesel injectors on your Renault Scenic 4, 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 reveals, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your Renault Scenic 4 will be caused by an O-ring or its plastic tip that leaks.
  • Injector base leak:
    This injection leak is one of the most bothersome, 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 examining you have oil leaking but it does not come from your injectors, we encourage you to read this content on the presence of oil leaking on your Renault Scenic 4.

Leaking injector on my Renault Scenic 4, how to fix the leak

And to finish, we’re going to look at how to fix a leaking injector on your car. Frequently a leak is linked, as we have seen previously, to a worn seal because of the pressures endured. But think that the pressure in the circuit is monumental, especially on diesel engines. So you will have to take some measures:

  • Lower the pressure before any work is carried out…
  • Covering 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 changing the seals that have failed:

  • Locate the source of the leak
  • Take apart 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 situations, these interventions are not specifically difficult, but if you have the tiniest uncertainty in the treatment of your injector that leaks on your Renault Scenic 4, we encourage you to get closer to your motor mechanic to avoid any bad manipulation that could severely harm the condition of your Renault Scenic 4.

If you want more tutorials on the Renault Scenic 4, go to our Renault Scenic 4 category.