Garrett, KKK, Schwitzer, Holset, Mitsubishi, IHI, Hitachi, Toyota, CZ.
A delivered turbocharger is subjected to overall inspection, which is targeted for preliminary determining its technical state.At this stage we check the mechanic damages of the turbochargers and presence of oil inside the compressor and turbine housings. Afterwards we check the shaft’s axial and radial clearance as well as work and steering of the pressure charge regulation system (wastegate or variable geometry system).
Afterwards we dismount the elements of the turbocharger in order to assess its condition thoroughly. Now the mechanical damages, that could not be seen during initial verification, can appear. Non-damaged parts are cleaned and damaged parts are replaced by new elements. During the reconditioning we always change the bearings, sealing rings and other seals of the turbocharger.
Crucial action during turbocharger reconditioning is appropriate balancing of the rotating system of the turbocharger. It contains two stages that include balancing the shaft followed by balancing the whole rotating system in its bearing. In the second stage the turbocharger works in similar conditions to these in the combustion engine – the rotating system reaches the speed of 300 000 revs/min and the engine oil is constantly supplied under the appropriate pressure (what allows to verify tightness of the turbocharger). Appropriate balancing of the rotating system is confirmed by a protocol printed after the whole process.
Final repair phase involves putting all elements together and appropriate setting the steering of the pressure charge regulation system (wastegate or variable geometry system).