Bearing Clearance Check

When bearing damage is suspected, verify using the following procedure.

Check for Free Rotation

NOTE: 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 the turbocharger must be replaced.

Check Axial End Play
1. Position the dial indicator on the turbine end of the radial shaft and zero the indicator.

NOTE:
^ Radial shaft movement cannot readily be measured on this turbocharger.
^ Remove the exhaust back pressure valve from the turbocharger; for additional information, refer to Exhaust Gas Control Valve.







2. Move the radial shaft back and forth by hand and record the reading.
3. If readings exceed specifications, replace the turbocharger.