Whenever you are alert of unusual symptoms on your car, you are right to be concerned, because a car represents a huge annual budget and unforeseen breakdowns don’t lower the costs. So what if you sense that you have a leaking injector on your smart fortwo? You most likely figured it out thanks to black/oily drips along your engine motor, or a disturbed idle, or uncommon black smoke. These three symptoms are the main signals of a leaking injector. As this problem can produce more significant engine trouble on your car, we decided to prepare this article to help you verify the failure of a leaking injector and deal with it correctly. To achieve this, we will initially check out the circumstance of gasoline injectors and then at those of diesel injectors smart fortwo.
Leaking injector on my petrol smart fortwo
It is essential to know that the injectors on petrol and diesel engines are different, in fact, 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 smart fortwo: The different leaks
It should be known that injector leaks on a smart fortwo equipped with a petrol engine are pretty infrequent. This is caused by 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 portion that is connected to the fuel rail, an O-ring will be involved in this. - Leak injector of the lower part:
Finally, you may suffer a leak coming from the lower part of the injector of your car, this one will come from the junction with the engine and not with the rail as seen sooner.
Leaking injector on my diesel smart fortwo
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 smart fortwo: The different leaks
In the circumstance of leaking diesel injectors on your smart fortwo, there are three several kind of leaks:
- Leakage from the injector inlet:
In cases like this, it is an inlet pipe that will deform after a while, commonly the leak will be at the clamping point. - Injector return leakage:
As its name suggests, this leakage concerns the management of the fuel return in the injector, this time the injector that leaks on your smart fortwo 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 feel an air noise and a compression loss. - If after examining you have oil leaking but it does not come from your injectors, we recommend you to consult this article on the presence of oil leaking on your smart fortwo.
Leaking injector on my smart fortwo, how to fix the leak
And to finish, 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 previously, to a worn seal due to the pressures suffered. But think that the pressure in the circuit is monumental, specifically on diesel engines. So you will have to take some precautions:
- Lower the pressure before any work is done…
- Covering 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:
- Find the source of the leak
- Take apart the injector in question
- Change the corresponding seal kit
- Reassemble the assembly and tighten with a torque wrench in accordance with the manufacturer’s standards.
In all situations, these interventions are not inevitably very hard, but if you have the slightest doubt in the treatment of your injector that leaks on your smart fortwo, we recommend you to get closer to your auto technician to avoid any bad manipulation that could critically harm the condition of your smart fortwo.
If you wish more tutorials on the smart fortwo, go to our smart fortwo category.
