Sudden Oil Decrease; Decrease In Output; Poor (Slow) Response (Starting) Of Turbocharger; Abnormal Sound Or Vibration - Komatsu 82E Series Shop Manual

8.8.3

Sudden oil decrease

1) Excessive bearing wear causing abnormal wear or
damage of seal ring
8.8.4

Decrease in output

1) Gas leak from any part in exhaust piping
2) Air leak from discharge side of blower
3) Clogged air cleaner element
4) Fouled or damaged turbocharger
8.8.5

Poor (slow) response (starting) of turbocharger

1) Hard carbon deposit on the turbine side (wheel
sealing portion) to make turbine shaft revolution
heavy
2) Incomplete combustion
8.8.6

Abnormal sound or vibration

(1) Abnormal sound generation
1) Excessively narrowed gas path due to clogged
nozzle in turbine wheel chamber or reverse flow of
blower discharge in acceleration (generally called
surging)
2) Contact rotating part
(2) Vibration
1) Loosened intake, exhaust or oil pipe connection
with the turbocharger
2) Damaged bearing, contact between rotating part
and adjacent part, or chipping of turbine wheel or
blower vane due to foreign matter invasion
3) Unbalanced rotating part
82E-5 – 98E-5 SERIES
Cause
Cause
Cause
Cause
Cause
Corrective action
• Turbocharger disassembly and repair
Corrective action
• Inspection and repair of defective portion
• Element cleaning or replacement
• Turbocharger disassembly and repair or replace-
ment
Corrective action
• Turbocharger disassembly and washing with lubri-
cating oil replacement
• Engine combustion state inspection, followed by
improvement of combustion to normal state
Corrective action
• Turbocharger disassembly and washing
• Turbocharger disassembly and repair or replace-
ment
Corrective action
• Turbocharger installation status check and repair
of defective portion
• Turbocharger disassembly with repair or replace-
ment, or perfect removal of foreign matters in case
of foreign matter invasion
• Repair or replacement of rotating part
8. TURBOCHARGER
8-21