Whenever you are aware of unusual signs on your vehicle, you are right to be preoccupied, because a car represents a big annual budget and unforeseen malfunctions don’t reduce the expenses. So what if you find that you have a leaking injector on your Volkswagen Jetta? You almost certainly figured it out thanks to black/oily drips along your engine unit, or a troubled idle, or uncommon black smoke. These three symptoms are the main signs of a leaking injector. As this troubles can produce more severe engine trouble on your car, we decided to write this content page to help you validate the failure of a leaking injector and deal with it properly. To accomplish this, we will first look into the case of gasoline injectors and then at those of diesel injectors Volkswagen Jetta.
Leaking injector on my petrol Volkswagen Jetta
It is crucial to know that the injectors on petrol and diesel engines are different, actually, the difference in combustion between these two sort 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 Volkswagen Jetta: The different leaks
It should be noted that injector leaks on a Volkswagen Jetta equipped with a petrol engine are rather infrequent. This is caused by the much lower pressure in the petrol intake systems. Even so, there are two sort of leaks:
- Leakage from the top of the injector:
It is conceivable that you have a leak from the top of the injector, this is the part 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 Volkswagen Jetta
Unlike petrol engines, which have spark combustion, diesel engines run on compression. This combustion procedure 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 Jetta: The different leaks
In the case of leaking diesel injectors on your Volkswagen Jetta, there are three different sort of leaks:
- Leakage from the injector inlet:
In this case, it is an inlet pipe that will deform in the long run, in most cases the leak will be at the clamping point. - Injector return leakage:
As its name implies, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your Volkswagen Jetta 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 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 browse this content page on the existence of oil leaking on your Volkswagen Jetta.
Leaking injector on my Volkswagen Jetta, how to fix the leak
And finally, we’re going to look into how to fix a leaking injector on your car. Very often a leak is connected, 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 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.
Regarding the repair part of your leak, it will regularly be restricted to replacing the seals that have failed:
- Find 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 situations, these interventions are not inevitably difficult, but if you have the tiniest doubt in the treatment of your injector that leaks on your Volkswagen Jetta, we suggest you to get closer to your mechanic to avoid any bad handling that could severely harm the condition of your Volkswagen Jetta.
If you wish more tutorials on the Volkswagen Jetta, go to our Volkswagen Jetta category.
