Inspection Procedure - Yanmar 3TNV Series Service Manual

8. Turbochager

8.3.2 Inspection procedure

(1) Rotor rotation inspection
Inspect the rotor rotation by listening to any abnormal sound generation during rotation.
For inspection with a sound detecting bar, bring the tip end of the bar into strong contact with the
turbocharger case and raise the engine speed gradually.
If any high pitch sound is generated at intervals of 2 to 3 seconds, the rotation is abnormal. Since the
bearing or rotor may be defective in this state, either replace or overhaul the turbocharger.
(2) Rotor play inspection
Remove the turbocharger from the engine and inspect the rotor play in the axial and radial directions
according to the procedure below.
After removing the turbocharger from the engine, always bind the oil inlet and outlet holes with adhesive
tape.
Rotor play in axial direction
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