S-9 Exhaust Smoke Is Black - Komatsu PC88MR-10 Shop Manual

S-9 Exhaust smoke is black

Failure Exhaust smoke is black.
Related
If any failure code is displayed, perform troubleshooting for that code first.
information
No. Cause
Improper fuel used
1
Foreign material in fuel
2
3 Defective air cleaner
Defective exhaust gas piping
4
(from exhaust manifold to
KDOC muffler inlet)
Defective installation of
5 charge (boost) pressure
sensor
Defective boost piping and
connections
6
(between turbocharger outlet
and air intake manifold)
7 Defective KDOC muffler
Gas leakage from EGR piping
8
Seized or broken
9
turbocharger
10 Defective injector
11 Defective fuel return piping
Defective mass air flow and
12
temperature sensor
13 Incorrect valve clearance
PC88MR-10
(D37-AH5-400-A-Z0-A)
Point to check, remarks
Fuel other than specified one is used.
Rust and water are found in fuel drained
from fuel tank.
Check air cleaner and rectifying wire net for
deformation.
Check exhaust gas piping for damage and
exhaust gas leakage.
(Check soot on heat insulation cover and
heat insulation plate.)
Air leakage from installed position of charge
(boost) pressure sensor
Air leaks from boost piping.
KDOC muffler is clogged. Check exhaust
pressure pressure at location just upstream
of KDOC muffler.
Gas leaks from EGR piping.
Unusual noise is heard from turbocharger.
Check whether turbocharger shaft rotates.
(Move turbocharger vanes with hand in axial
and radial directions to make judgment.)
Some cylinder is found to be cool when
exhaust manifolds are touched by hand
immediately after engine is started.
When engine is run in cylinder cutout mode
with some cylinder cut out, engine speed
does not change.
(Reference: See Testing and adjusting,
"Handling cylinder cutout mode operation".)
Measured fuel return rate is excessive.
(Reference: See Testing and adjusting,
"Testing fuel discharge,
leakage".)
Check fuel return piping for clogging.
Replace sensor and check whether
symptom disappears.
(Failure code may not be generated if
sensor is covered with dust.)
When engine is cranked, unusual noise is
heard from around cylinder head.
Check valve clearance.
(Reference: See Testing and adjusting,
"Testing and adjusting valve clearance".)
40 Troubleshooting
Troubleshooting of engine (S-mode)
Remedy
Use proper fuel
specified in Operation
and Maintenance
Manual.
Replace fuel.
Correct or replace air
cleaner.
Replace exhaust gas
piping.
Correct installation of
charge (boost)
pressure sensor.
Correct or replace
boost piping.
Replace KDOC
muffler.
Replace EGR piping.
Replace turbocharger.
Replace injector.
Correct or replace fuel
return and
return piping.
Replace mass air flow
and temperature
sensor.
Adjusting valve
clearance
40-527