Troubleshooting; Excessively Exhaust Smoke; White Smoke Generation - Yanmar 3TNV Series Service Manual

8. Turbochager

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 troubleshooting according to the procedure shown below.

8.8.1 Excessively exhaust smoke

(1) Insufficient intake air volume
1) Clogged air cleaner element
2) Blocked air intake port
3) Leak from a joint in intake line
(2) Turbocharger revolution failure
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 stoop 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
(3) Influence of exhaust resistance
1) Exhaust gas leak before the turbocharger to
decrease its revolutions
2) Deformed or clogged exhaust pipe to decrease
turbocharger revolutions

8.8.2 White smoke generation

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
Cause
Cause
Cause
Cause
Corrective action
Replace or wash the element.
Correct to the normal state.
Inspect and repair.
Corrective action
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
manual
Inspection and repair of each engine part
Perfect foreign matter elimination in disassembled
state, followed by inspection and repair of
individual air cleaner and engine components
turbocharger overhaul (disassembly and repair)
Reassembly
Corrective action
Joint inspection and correction
Correct to the normal state.
Corrective action
Repair or pipe replacement
Turbocharger disassembly and repair
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