In cases where you are aware of irregular signs on your car, you are right to be concerned, because a car represents a massive annual budget and surprising breakdowns don’t lower the expenses. So what if you sense that you have a leaking injector on your Renault Scenic 2? You probably figured it out thanks to black/oily drips along your engine unit, or a troubled idle, or abnormal black smoke. These three symptoms are the main signals of a leaking injector. As this troubles can bring about more severe engine complications on your car, we made a decision to write this article content to help you verify the failure of a leaking injector and treat it correctly. To achieve this, we will initially take a look at the circumstance of gasoline injectors and then at those of diesel injectors Renault Scenic 2.
Leaking injector on my petrol Renault Scenic 2
It is vital to know that the injectors on petrol and diesel engines are different, the reality is, the difference in combustion between these two kind of engines makes the injection different. The main 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 2: The different leaks
It should be said that injector leaks on a Renault Scenic 2 equipped with a petrol engine are rather rare. This is because 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 component 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 part of the injector of your car, this one will appear from the junction with the engine and not with the rail as seen before.
Leaking injector on my diesel Renault Scenic 2
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 Scenic 2: The different leaks
In the circumstance of leaking diesel injectors on your Renault Scenic 2, there are three different kind of leaks:
- Leakage from the injector inlet:
In cases like this, it is an inlet pipe that will deform with time, commonly the leak will be at the clamping point. - Injector return leakage:
As its name implies, this leakage relates to the management of the fuel return in the injector, this time the injector that leaks on your Renault Scenic 2 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 checking you have oil leaking but it does not come from your injectors, we suggest you to read this article content on the presence of oil leaking on your Renault Scenic 2.
Leaking injector on my Renault Scenic 2, 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 tremendous, specifically on diesel engines. So you will have to take some precautions:
- Lower the pressure before any work is done…
- 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:
- Discover the source of the leak
- Take apart 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 inevitably complex, but if you have the slightest hesitation in the treatment of your injector that leaks on your Renault Scenic 2, we suggest you to get closer to your auto mechanic to avoid any bad handling that could critically harm the condition of your Renault Scenic 2.
If you wish more guides on the Renault Scenic 2, go to our Renault Scenic 2 category.
