Gently remove the CHRA (core) assembly from the
turbine housing. If necessary use a soft hammer to free
the joint.
HX25/25W/27W Service Repair Manual Component Testing and Replacement
4:8
Cracking of the turbine housing inlet flange and inlet
duct generally requires turbine housing replacement.
Acceptance and rejection guidelines are shown in this
illustration. If an exhaust gasket is available, always
ensure that any cracks lie within its sealing area
Check turbine housing inlet flange flatness is within
0.1 mm (0.004 in) before retaining component for re-
use.
Check fastener hole diameter is not more than 1.5 mm
larger than the max. thread diameter of the fastener.
Cracking of the internal wall at the entry to the turbine
wheel (tongue) is an acceptable service condition and
the turbine housing may be re-used.
Caution
Turbine blades can be damaged easily when the
turbine housing is removed. Do not bend the locating
pin that aligns bearing housing and turbine housing.
Caution
Turbine housings can exhibit cracking when subject to
excessive thermal and mechanical loads.
Caution
Where a crack will cause leakage to atmosphere the
turbine housing must be replaced.
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