Variable geometry turbochargers have not always been the best in terms of reliability. But not all VGT’s are bad. It is a complicated problem that requires a complicated solution. Manufacturers have been handed the task of making diesel engines more efficient and produce fewer emissions. This is where components such as a variable geometry turbo come into play.
However, when something goes wrong with your VGT turbo, chances are that more serious are at the core of the problem. Common issues can include but are not limited to: cooling issues, oil starvation, and excessive temperatures. You may think that removing or deleting your EGR system will get rid of most problems. Unfortunately, it is not that easy. Read this article here on why you shouldn’t remove your EGR system to find out why simply deleting your EGR may not be the answer.
VGT Gear Selector Issues
Issues with a VGT turbocharger on your diesel engine can be very complicated. Alternatively, it can be as simple as having a defective gear selector. If you have determined that the gear selector is to blame, it may be best to ask why this may have happened in the first place.
Once the actuator has been removed, the gear selector should be able to be moved freely up and down without any grinding resistance. Most VGT turbos will have a dimple on the body which indicates how far the selector should be able to travel. If it does not reach that point, it may indicate that there is damage and should be investigated further.
There are several reasons that a VGT turbo selector is not able to move freely. Improper installation could be one of the main reasons why the selector has failed in the first place. Here is a guideline that outlines the proper steps needed to install a VGT turbocharger.
VGT Shroud Plate Damage Issues
As previously mentioned, a damaged gear or non-moving selector on a VGT turbo will indicate possible issues inside the turbo. One of those issues may be a broken or cracked shroud plate. With the exhaust side of the turbo completely removed, the shroud plate should be able to move freely from stop to stop.
If the shroud plate is damaged, chances are that it may be damaged thanks to a bent or broken fin. This is why the proper installation and maintenance of a VGT turbocharger are extremely important.
Carbon, coolant contamination, low oil, and a plugged EGR system could also contribute to a damaged or irreparable VGT shroud plate on a turbocharger. Check out this in-depth post about VGT turbocharger problems in your diesel engine for more info.
Final Words
DFI is committed to providing you with as much information as possible to help get your truck or heavy equipment back up and running in no time. Contact us for anything needed to get your VGT turbocharger performing like new. From the smallest gasket to a complete rebuilt kit, DFI has you covered.
Do you have any additional questions about your damaged or defective turbo? Our ASE-certified staff is ready to resolve all of your issues.
