Engine Lack Output (Or Lacks Power); General Causes Why Engine Lacks Output - Komatsu PC210-8 Shop Manual

40 Troubleshooting
S-6 Engine lack output (or lacks power)

General causes why engine lacks output

Insufficient intake of air
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Insufficient supply of fuel
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Defective spray condition of fuel
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Improper selection of fuel
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There is overheating
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o See "S-14 Coolant temperature becomes too
high (Overheating)".
Controller is controlling in derate mode (limiting
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injection rate (output) because of an error in
electrical system)
Confirm recent repair history
Degree of use of machine Operated for long period
Power was lost
Non-specified fuel is being used
Replacement of filters has not been carried out according to Operation
and Maintenance Manual
Engine oil must be added more frequently
Dust indicator is red
Air breather hole of fuel tank cap is clogged
Fuel is leaking from fuel piping
Output becomes insufficient after short stop of operation
Colour of exhaust gas
When exhaust manifold is touched immediately after starting engine,
temperature of some cylinders is low
When engine is cranked, interference sound is generated around
turbocharger
When engine is cranked, abnormal sound is generated around cylinder
head
High idle speed is too high
High idle speed under no load is normal, but speed suddenly drops when
load is applied
Engine does not pick up smoothly and combustion is irregular
There is hunting from engine (rotation is irregular)
Blow-by gas is excessive
Inspect air cleaner directly
Inspect air intake piping directly
When boost pressure is measured, it is found to be low
When compression pressure is measured, it is found to be low
Inspect valve clearance directly
Inspect fuel piping
Inspect fuel filter, strainer directly
Inspect spill port check valve directly
Carry out troubleshooting according to "Rail Press (Very) Low Error (*1)"
indicated by code
When a cylinder is cut out for reduced cylinder mode operation, engine
speed does not change
Inspect boost pressure sensor mount directly
Carry out troubleshooting according to "Chg Air Press Sensor High (Low)
Error (*2)" indicated by code
PC210, 230, 240-8
Suddenly
Gradually
Black
Blue under light load
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Remedy
UEN00246-02
Causes
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