SHOP MANUAL MT26-31 - 06.2005
Engine
Tier-3 710655-
Ch 1 page 70
Measuring radial clearance and axial clearance does no
usually give any indication of the remaining service life of the
turbocharger.
When the turbocharger is not working correctly or sounds
abnormal, measuring charge pressure or measuring radial
clearance or axial clearance can show that the turbocharger is
defective.
To measure axial and radial clearances it is advisable to
remove the turbocharger and bolt it to a steel plate, which will
also serve as a base for the magnetic stand holding the dial
gauge.
Radial clearance
Take readings on both turbine wheel and compressor wheel.
1.
Place the tip of the deflektion gauge against the turbine
wheel and compressor wheel.
2.
Pull both ends of the shaft up. Take a reading.
3.
Press both ends of the shaft down. Take a reading. The
difference between readings is radial clearance.
4.
Repeat measurements three times on each side.
5.
If any wheel rubs against the housing, despite radial clearance
being within tolerance, the turbocharger should be changed.
Measuring turbine wheel radial
clearance with deflection gauge
8222 and measuring stand 8209
Measuring radial clearance and axial clearance
Measuring compressor wheel radial
clearanse with deflection gauge
8222 and measuring stand 8209
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