Bearing Clearance Check
BEARING CLEARANCE CHECKWhen bearing damage is suspected, verify using the following procedure.
Check for Free Rotation
NOTE:
- The turbocharger must be preoiled before carrying out this check.
- Turbine and compressor wheels must spin freely when turned by hand. No housing contact is permitted.
Press and rotate the radial shaft, then repeat from the opposite side. If either the compressor wheel or the turbine wheel contacts the housing, the bearings are bad, and a new turbocharger must be installed.
Check Axial End Play
1. NOTE: Radial shaft movement cannot readily be measured on this turbocharger.
Position the dial indicator on the turbine end of the radial shaft and zero the indicator.
2. Move the radial shaft back and forth by hand and record the reading.
3. If readings exceed specifications, install a new turbocharger.