In cases where you are informed of unusual symptoms on your automobile, you are right to be preoccupied, because a car represents a big annual budget and sudden breakdowns don’t lower the bill. So what if you find that you have a leaking injector on your Renault Grand Scenic 4? You probably figured it out thanks to black/oily drips along your engine unit, or a disturbed idle, or strange black smoke. These three symptoms are the main signs of a leaking injector. As this failure can bring about more significant engine complications on your car, we thought we would compose this content to help you ensure the failure of a leaking injector and deal with it properly. To do this, we will first of all look into the circumstance of gasoline injectors and then at those of diesel injectors Renault Grand Scenic 4.

leaking-injector-renault-grand-scenic-4

Leaking injector on my petrol Renault Grand Scenic 4

It is essential to know that the injectors on petrol and diesel engines are different, the truth is, the difference in combustion between these two types 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 Renault Grand Scenic 4: The different leaks

It should be noted that injector leaks on a Renault Grand Scenic 4 equipped with a petrol engine are pretty rare. This is because 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 plausible that you have a leak from the top of the injector, this is the portion that is connected to the fuel rail, an O-ring will be involved in this.
  • Leak injector of the lower part:
    At last, 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 Renault Grand Scenic 4

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 Renault Grand Scenic 4: The different leaks

In the circumstance of leaking diesel injectors on your Renault Grand Scenic 4, there are three several types of leaks:

  • Leakage from the injector inlet:
    In this case, it is an inlet pipe that will deform after a while, generally 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 Renault Grand Scenic 4 will be the result 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 examining you have oil leaking but it does not come from your injectors, we advise you to browse this content on the presence of oil leaking on your Renault Grand Scenic 4.

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

And at last, we’re going to look into how to fix a leaking injector on your car. Frequently a leak is associated, as we have seen previously, to a worn seal due to the pressures endured. But think that the pressure in the circuit is gigantic, specifically on diesel engines. So you will have to take some measures:

  • Lower the pressure before any work is completed…
  • 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:

  • Identify 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 respect with the manufacturer’s standards.

In all situations, these interventions are not automatically complicated, but if you have the tiniest hesitation in the treatment of your injector that leaks on your Renault Grand Scenic 4, we advise you to get closer to your auto mechanic to avoid any bad handling that could severely harm the condition of your Renault Grand Scenic 4.

To discover more tips on the Renault Grand Scenic 4, take a look at the Renault Grand Scenic 4 category.