In the event that you are aware of abnormal signs on your vehicle, you are right to be preoccupied, because a car represents a big annual budget and unpredicted breakdowns don’t reduce the costs. So what if you feel as if you have a leaking injector on your Volkswagen Polo 5? You most likely figured it out thanks to black/oily drips along your engine motor, or a disturbed idle, or unusual black smoke. These three manifestations are the main signals of a leaking injector. As this problem can bring about more critical engine concerns on your car, we decided to write this article content to help you ensure the failure of a leaking injector and deal with it correctly. To do so, we will initially take a look at the circumstance of gasoline injectors and then at those of diesel injectors Volkswagen Polo 5.
Leaking injector on my petrol Volkswagen Polo 5
It is essential to know that the injectors on petrol and diesel engines are different, in reality, the difference in combustion between these two types of engines makes the injection different. The key 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 Volkswagen Polo 5: The different leaks
It should be noted that injector leaks on a Volkswagen Polo 5 equipped with a petrol engine are rather rare. This is caused by the much lower pressure in the petrol intake systems. Nevertheless, 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 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 encounter a leak coming from the lower portion 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 Volkswagen Polo 5
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 Volkswagen Polo 5: The different leaks
In the circumstance of leaking diesel injectors on your Volkswagen Polo 5, there are three several types of leaks:
- Leakage from the injector inlet:
In this instance, it is an inlet pipe that will deform with time, generally 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 Volkswagen Polo 5 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 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 verifying 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 Volkswagen Polo 5.
Leaking injector on my Volkswagen Polo 5, how to fix the leak
And to finish, we’re going to take a look at how to fix a leaking injector on your car. Very often a leak is associated, as we have seen previously, to a worn seal due to the pressures suffered. But think that the pressure in the circuit is tremendous, specifically on diesel engines. So you will have to take some safety measures:
- 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.
Concerning the repair part of your leak, it will regularly be restricted to replacing the seals that have failed:
- Identify 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 cases, these interventions are not specifically complicated, but if you have the smallest uncertainty in the treatment of your injector that leaks on your Volkswagen Polo 5, we suggest you to get closer to your auto technician to avoid any bad manipulation that could seriously harm the condition of your Volkswagen Polo 5.
In the event that you have any additional questions about the Volkswagen Polo 5, do not hesitate to consult our Volkswagen Polo 5 category.
