Radial cracks can occur around the valve seat when
the turbocharger has been abused or overheated.
HX25/25W/27W Service Repair Manual Component Testing and Replacement
4:17
Lever arm pin can be worn by partial seizure of the
valve mechanism. Scoring may be caused by arduous
local environmental conditions.
The same failure conditions can also lead to elongation
of the actuator rod bore which locates on the lever arm
pin. This must not exceed 0.5 mm (0.020 in).
Caution
If the wastegate valve mechanism shows any fault, it
must be replaced. Using damaged turbine housings
will lead to inferior performance of the turbocharger,
and risk of irreparable damage to both turbocharger
and engine.
Caution
If the actuator shows any fault, it must be replaced.
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