Note
Holset Service receives many turbocharger returns that are no fault found. Before assuming the turbocharger
is not performing to specification always refer to the engine diagnostic system and the troubleshooting
diagnostic procedures of this manual.
HX25/25W/27W Service Repair Manual Introduction
1:3
Notes, Cautions and Warnings
Notes, Cautions and Warnings are used in this manual to emphasise important or critical instructions.
Note
Information which is essential to highlight.
Caution
Maintanence or Service procedures which if not strictly followed, will result in damage or destruction of the
turbocharger.
Warning
Maintanence or Service procedures which if not correctly followed will result in personal injury or loss of life.
Warning
Turbocharger surface temperature during operation can achieve 700°C (1300°F). The designated
turbocharger range weighs up to 4.8 kg (10.6 lb) and is fitted with external parts that are sensitive to manual
handling.
Caution
This turbocharger requires a new standard of balancing process on rebuild using a proprietary vibration
sorting rig (VSR).
The turbocharger will not have any co-relation marks. If you intend to overhaul/repair the turbocharger, and
do not have access to a VSR machine, we recommend that you send the reassembled core in appropriate
packaging to protect the turbine and compressor blades to an approved Holset agent with VSR facilities.
As the results of vibration based tests are rig specific, the balance limits shown in Holset’s Service Data
Sheets are advisory only. Refer to repair agent to warrant durability, noise and vibration level of the specific
VSR balancing process used.
If you are in any doubt regarding the balancing process, please contact the local Holset agent for assistance.
Warning
Some parts are manufactured in Viton that requires special treatment in the case of repair and service after
fire.
Note
Holset turbochargers can be remanufactured using recovered parts. Where it is necessary to dispose of
components or whole turbochargers, an environmentally responsible process such as recycling should be
used, with due regard to local laws.
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