8-20 82E-5 – 98E-5 SERIES
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
Cause Corrective action
1) Clogged air cleaner element • Replace or wash the element.
2) Blocked air intake port • Correct to the normal state.
3) Leak from a joint in intake line • Inspect and repair.
Cause Corrective action
1) Deposit of impurities in oil sticking on the turbine
side seal portion to make turbine revolution heavy
• Turbocharger overhaul (disassembly and washing)
with lubricating oil replacement
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)
• 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
3) Contact or breakdown of turbine wheel or blower
vane
• Excessive revolution
• Excessive exhaust temperature rise
• Foreign matter invasion
• Worn bearing
• Assembly defect
• 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
• Joint inspection and correction
2) Deformed or clogged exhaust pipe to decrease
turbocharger revolutions
• Correct to the normal state
Cause Corrective action
1) Clogged or deformed oil return pipe causing oil
flow to the blower or turbine side
• Repair or pipe replacement
2) Excessive bearing wear causing abnormal wear or
damage of seal ring
• Turbocharger disassembly and repair
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