TURBOCHARGER — Inspection (Cont'd)
EM-30prose procedureInspection (Cont'd)
Condition 3: Excessively high oil consumption or exhaust shows pale blue smoke
Probable Cause
Corrective Action
Oil leak at the connection of lubricating oil passage
Correct the connection.
Oil leak at oil seal of turbine
Oil leak at oil seal of compressor
Worn journal or bearing
Replace turbocharger assembly.
Cause
Oil leak at the connection of lubricating oil passage
Fix
Correct the connection.
Cause
Oil leak at oil seal of turbine
Cause
Oil leak at oil seal of compressor
Cause
Worn journal or bearing
Fix
Replace turbocharger assembly.
Turbocharger Inspection
- 1Inspect turbine and compressor wheel as follows: • Visually check for cracks, clogging, deformity or other damage. • Revolve wheels to make sure that they turn freely without any abnormal noise or friction. • Measure play in axial direction.
SEF726B - 2Check operation of by-pass valve controller. • Move by-pass valve to make sure that it is not sticking or scratched. • Measure rod end play of the by-pass valve controller. Do not apply excessively high pressure to controller diaphragm.Do not apply excessively high pressure to controller diaphragm.
SEC727B
| Specification | Value |
|---|---|
| Play (axial direction)Turbine and compressor wheel axial play | 0.013 - 0.097mm |
| Play (axial direction)Turbine and compressor wheel axial play | 0.0005 - 0.0038in |
| By-pass valve controller stroke/pressureBy-pass valve controller stroke | 0.38mm (0.0150 in) |
| By-pass valve controller stroke/pressureBy-pass valve controller pressure | 78.6 - 84.0kPa |
| By-pass valve controller stroke/pressureBy-pass valve controller pressure | 786 - 840mbar |
| By-pass valve controller stroke/pressureBy-pass valve controller pressure | 590 - 630mmHg |
| By-pass valve controller stroke/pressureBy-pass valve controller pressure | 23.23 - 24.80inHg |
Play (axial direction)Turbine and compressor wheel axial play
0.013 - 0.097mm
Play (axial direction)Turbine and compressor wheel axial play
0.0005 - 0.0038in
By-pass valve controller stroke/pressureBy-pass valve controller stroke
0.38mm (0.0150 in)
By-pass valve controller stroke/pressureBy-pass valve controller pressure
78.6 - 84.0kPa
By-pass valve controller stroke/pressureBy-pass valve controller pressure
786 - 840mbar
By-pass valve controller stroke/pressureBy-pass valve controller pressure
590 - 630mmHg
By-pass valve controller stroke/pressureBy-pass valve controller pressure
23.23 - 24.80inHg
IMPORTANT
Always replace the turbocharger as an assembly if necessary.