SHOP MANUAL
Engine
Ch 1 page 90
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 advis able 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 com pressor 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 clear-
ance being within toler ance, 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
Figure 172
Figure 173
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