Core Balance
HX25/25W/27W Service Repair Manual Turbocharger Service and Overhaul
Reassembly
5:13
Small high speed turbochargers require a new standard
of balancing process using a proprietary vibration
sorting rig (VSR). As the results of vibration based tests
are rig specific, the balance limits shown in Holsetās
Service Data Sheets are advisory only. Refer to repair
agent to warrant durability, noise and vibration level of
the specific balancing process used.
Turbocharger Reassembly
Install new split ring seal, turbine (13)
*
to assembly,
turbine wheel.
Lightly oil journal bearing, turbine (11)
*
and insert into
position against inboard retaining ring, bearing (64).
Caution
This turbocharger was manufactured using a high
speed core balance process. It must be re-balanced
on reassembly using a vibration sorting rig (VSR).
Warning
Always wear safety glasses when refitting sealing and
retaining rings.
Note
Proprietary retaining rings, bearing may still be fitted
following cleaning and inspection. Refer to
Disassembly for removal/fitting.
They can be replaced by an equivalent circlip.
Caution
When fitting circlips always ensure the bevelled edge
is facing the journal bearing. Premature failure will
result from incorrect orientation.
Caution
Any attempt to balance the rotor using scribe marks
could lead to turbocharger and engine failure. Do not
scribe mark any rotor component.
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