Variable Geometry Turbocharger
| ITEM | DESCRIPTION |
|---|---|
| 1 | Charge air outlet connection |
| 2 | Exhaust inlet connection |
| 3 | Oil feed connection |
| 4 | Coolant return connection |
| 5 | Coolant supply connection |
| 6 | Variable Geometry Turbocharger (VGT) vane actuator rod |
| 7 | Exhaust outlet connection |
| 8 | Oil return connection |
| 9 | Variable Geometry Turbocharger (VGT) vane actuator |
| 10 | Clean air inlet connection |
The Variable Geometry Turbocharger (VGT) consists of two turbo elements, a turbine wheel and compressor wheel, enclosed separately in cast housings and mounted on a common shaft. The shaft is supported on ball bearings. The application of the machined compressor wheel and the ball bearing results improved durability, reduced Noise, Vibration and Harshness (NVH) and optimized fuel economy.
The VGT is attached to the left exhaust manifold and secured to three studs on a flange on the manifold with nuts. On production, no gasket is used to seal the joint surface between the VGT and the manifold. In-service vehicles will require a service gasket to be fitted if the joint surface is disturbed.
A second flange on the VGT provides for the attachment of the left down pipe of the exhaust system. Three screws secure the down pipe to the flange and a gasket seals the joint.
The compressor end of the VGT has two hose connections. The central hose connection provides a clean air supply from the air cleaner to the compressor. The second connection on the outside of the housing provides for the attachment of the charge air ducts.
An integral bracket houses the VGT vane actuator. The VGT vane actuator is connected to an eccentric lever which moves the turbine housing to adjust the position of the vanes. When the actuator operates a boss is rotated, which in turn moves the lever and changes rotary motion into linear motion. The lever is connected to a rod attached to the outside of the turbine housing and the linear motion is converted back to rotary motion of the housing.