In the event that you are alert of unusual symptoms on your vehicle, you are right to be preoccupied, because a car represents a big annual budget and unforeseen malfunctions don’t lower the costs. So what if you sense that you have a leaking injector on your Renault Koleos? You most likely figured it out thanks to black/oily drips along your engine unit, or a disturbed idle, or abnormal black smoke. These three symptoms are the main indicators of a leaking injector. As this problem can cause more serious engine problems on your car, we thought we would compose this content page to help you ensure the failure of a leaking injector and deal with it correctly. To achieve this, we will first look at the case of gasoline injectors and then at those of diesel injectors Renault Koleos.
Leaking injector on my petrol Renault Koleos
It is crucial 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 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 Koleos: The different leaks
It should be known that injector leaks on a Renault Koleos equipped with a petrol engine are pretty 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 possible 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:
Finally, you may experience 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 sooner.
Leaking injector on my diesel Renault Koleos
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion system creates 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 Koleos: The different leaks
In the case of leaking diesel injectors on your Renault Koleos, there are three different kind of leaks:
- Leakage from the injector inlet:
In this case, it is an inlet pipe that will deform after a while, usually 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 Renault Koleos will be a consequence of 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 experience an air noise and a compression loss. - If after verifying you have oil leaking but it does not come from your injectors, we suggest you to consult this content page on the presence of oil leaking on your Renault Koleos.
Leaking injector on my Renault Koleos, how to fix the leak
And at last, we’re going to look at 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 suffered. But think that the pressure in the circuit is gigantic, especially on diesel engines. So you will have to take some precautions:
- Lower the pressure before any work is achieved…
- 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 very often be limited to changing the seals that have failed:
- Find 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 accordance with the manufacturer’s standards.
In all cases, these interventions are not necessarily difficult, but if you have the slightest hesitation in the treatment of your injector that leaks on your Renault Koleos, we suggest you to get closer to your motor mechanic to avoid any bad handling that could significantly harm the condition of your Renault Koleos.
Whenever you have any further questions about the Renault Koleos, do not hesitate to consult our Renault Koleos category.
