8. TURBOCHARGER 8.8 Troubleshooting Sufficient turbocharger performance and required engine output cannot be obtained if there is any fault. In such a case, first check each engine part to see there is no engine fault. Then inspect the turbocharger for trouble- shooting according to the procedure shown below. 8.8.1 Excessively exhaust smoke (1) Insufficient intake air volume (2) Turbocharger revolution failure (3) Influence of exhaust resistance 8.8.2 White smoke generation 8-20 82E-5 – 98E-5 SERIES Cause Corrective action 1) Clogged air cleaner element 2) Blocked air intake port 3) Leak from a joint in intake line • Replace or wash the element. • Correct to the normal state.
• Inspect and repair.
Cause Corrective action 1) Deposit of impurities in oil sticking on the turbine side seal portion to make turbine revolution heavy 2) Sticking bearing • Insufficient lubrication or clogged lubrication piping • Excessively high oil temperature • Unbalanced rotating part • Insufficient warming up or sudden stop from loaded operation (no-load operation) 3) Contact or breakdown of turbine wheel or blower vane • Excessive revolution • Excessive exhaust temperature rise • Foreign matter invasion • Worn bearing • Assembly defect • Turbocharger overhaul (disassembly and washing) with lubricating oil replacement • Turbocharger overhaul (disassembly and repair) • Lubricating oil line inspection, repair of defective portion and lubricating oil replacement • Rotating part replacement or washing • Strict observance of instructions in operation man- ual • Inspection and repair of each engine part • Perfect foreign matter elimination in disassembled state, followed by inspection and repair of individ- ual air cleaner and engine components • Turbocharger overhaul (disassembly and repair) • Reassembly Cause Corrective action 1) Exhaust gas leak before the turbocharger to decrease its revolutions 2) Deformed or clogged exhaust pipe to decrease turbocharger revolutions • Joint inspection and correction • Correct to the normal state Cause Corrective action 1) Clogged or deformed oil return pipe causing oil flow to the blower or turbine side 2) Excessive bearing wear causing abnormal wear or damage of seal ring • Repair or pipe replacement • Turbocharger disassembly and repair