In the event that you are alert of unusual symptoms on your vehicle, you are right to be intrigued, because a car represents a big annual budget and surprising malfunctions don’t reduce the expenses. So what if you think that you have a leaking injector on your Renualt Express? You probably figured it out thanks to black/oily drips along your engine unit, or a troubled idle, or abnormal black smoke. These three signs of illness are the main symptoms of a leaking injector. As this problem can bring about more critical engine complications on your car, we chose to produce this content page to help you ensure the failure of a leaking injector and handle it correctly. To do this, we will first of all check out the case of gasoline injectors and then at those of diesel injectors Renualt Express.

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Leaking injector on my petrol Renualt Express

It is vital to know that the injectors on petrol and diesel engines are different, in fact, 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 Renualt Express: The different leaks

It should be noted that injector leaks on a Renualt Express equipped with a petrol engine are pretty infrequent. This is due to 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 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:
    At last, 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 sooner.

Leaking injector on my diesel Renualt Express

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 Renualt Express: The different leaks

In the case of leaking diesel injectors on your Renualt Express, 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 suggests, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your Renualt Express will be caused 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 verifying you have oil leaking but it does not come from your injectors, we advise you to consult this content page on the existence of oil leaking on your Renualt Express.

Leaking injector on my Renualt Express, how to fix the leak

And at last, we’re going to check out how to fix a leaking injector on your car. Very often a leak is associated, as we have seen prior to this, to a worn seal as a result of the pressures endured. But think that the pressure in the circuit is enormous, 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.

Regarding the repair part of your leak, it will oftentimes be restricted to changing the seals that have failed:

  • Situate the source of the leak
  • Dismantle the injector in question
  • Change the corresponding seal kit
  • Reassemble the assembly and tighten with a torque wrench in respect with the manufacturer’s standards.

In all cases, these interventions are not necessarily complicated, but if you have the slightest uncertainty in the treatment of your injector that leaks on your Renualt Express, we advise you to get closer to your auto technician to avoid any bad manipulation that could seriously harm the condition of your Renualt Express.

If you wish more tutorials on the Renualt Express, go to our Renualt Express category.