Component Tests and General Diagnostics

TURBOCHARGER INSPECTION:

1. INSPECT TURBINE SHAFT ROTATION.



- Grasp the edge of the turbine wheel and turn it.
- Check that the impeller wheel turns smoothly.
- If the impeller wheel does not turn or if it turns with a drag, replace the turbocharger assembly.

2. INSPECT AXIAL PLAY OF TURBINE SHAFT.



- insert a dial indicator into the intake side hold the turbine wheel edge by hand, and check the axial play.

Standard clearance: 0.11 mm (0.0043 in) or less.

- If the axial play is not as specified, replace the turbocharger assembly.

3. INSPECT RADIAL PLAY OF TURBINE SHAFT.



- From oil outlet hole, insert a dial indicator through the hole in the spacer bearing and set it in the center of the turbine shaft.
- Move the turbine shaft in a radial direction, measure the radial play of the turbine shaft.

Standard clearance: 0.16 mm (0.0062 in) or less.

- If the radial play is not as specified, replace the turbocharger assembly.

4. INSPECT AIR BYPASS VALVE.



- Apply vacuum to port A, and check that the valve is open.



- In the preceding condition, apply vacuum to port B, and check that the valve is closed.
- If operation is not as specified, replace the valve.

5. INSPECT VTV (FOR AIR BYPASS VALVE).



- Check that air flows without resistance from port B to M.
- Check that air flows without difficulty from port "A" to "B".
- If operation is not as specified, replace the VTV.