Exhaust Smoke Is Black (Incomplete Combustion) - Komatsu PC200-8M0 Shop Manual

SEN06140-00
S-7 Exhaust smoke is black (incomplete combustion)
General causes why exhaust smoke is black
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Insufficient intake of air
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Improper fuel injection
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Improper selection of fuel
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Engine overheating
oSee "S-14 Coolant temperature becomes too high (overheating)".
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Controller is controlling in derate mode.
(limiting injection rate (power) because of an error in electrical system)
Check recent repair history.
Machine opera-
Operated for long period
tion hours
Suddenly became black.
Color of exhaust
Gradually became black.
smoke
Is blue under light load.
Fuel other than specified one is used
Engine oil must be added more frequently.
Suddenly
Power was lost
Gradually
Dust indicator indicates a red zone
Muffler is crushed.
Air leaks at tubing between turbocharger and cylinder head, and loose
clamp.
Engine is operated in low-temperature mode at normal temperature.
When exhaust manifold is touched immediately after starting engine, tem-
perature of some cylinders is low.
While engine is running, interference sound is heard around turbocharger.
While engine is running, unusual noise is heard around cylinder head.
Torque converter stall speed or pump relief speed is high (Fuel is injected
excessively).
Exhaust noise is unusual.
Engine does not pick up smoothly and combustion is irregular.
Blowby gas is excessive
When spill hose from injector is disconnected, fuel spills excessibly.
Check air cleaner.
When turbocharger is rotated by hand, it is fount to be heavy.
When compression pressure is measured, it is found to be low.
Check valve clearance.
If muffler is removed, exhaust sound improves.
Perform troubleshooting for "Supply pump pressure low error" according to
failure code (*1).
When a certain cylinder is cut out, engine speed does not change.
Perform troubleshooting for "Coolant sensor error" according to failure code
(*2).
Check the condition by using monitoring function of the machine monitor.
*1: Failure codes [CA559] and [CA2249]
*2: Failure codes [CA144] and [CA145]
14
40-600
600 Troubleshooting of engine (S-mode)
S-7 Exhaust smoke is black (incomplete combustion)
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Remedy
PC200, 200LC, 220, 220LC-8M0
Cause
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