It is permissible to bead blast the turbine housing if
chemical and brush cleaning is not effective.
HX25/25W/27W Service Repair Manual Turbocharger Service and Overhaul
5:7
It is important that the oil chamber of the bearing
housing is free of carbon before re-building. If heavy
deposits persist after repeat washing replace bearing
housing (4).
It is permissible to bead blast steel rotating parts.
Warning
Do not bead blast aluminium and cast iron
components together.
Caution
The surface adjacent to the turbine and compressor
wheels on the stationary housings must be clean,
smooth and free from deposits.
Always protect threads during bead blasting and
clean with the specified thread tap after blasting.
Prevent the bead spray impinging directly on the
wastegate valve spindle (where fitted) as beads can
penetrate the spindle bore, leading to spindle seizure.
Caution
Do not bead blast the bearing housing as this may
damage critical bearing surfaces.
Caution
Blasting specific areas for long periods of time may
affect component balance. Protect thread of turbine
wheel assembly.
Caution
Do not bead blast the aluminium compressor housing
as this may damage critical surfaces.
Caution
Always clean components with compressed air after
blasting.
Warning
Always wear safety glasses during cleaning.
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