SEN04125-02 40 Troubleshooting
12 PC130-8
S-3 Engine does not pick up smoothly 1
*1: Displayed failure codes [CA559] and [CA2249]
General causes why engine does not pick up smoothly
q Insufficient intake of air
q Insufficient supply of fuel
q Defective condition of fuel injection
q Improper selection of fuel
q Controller is controlling in derate mode
(limiting injection rate (output) because of an error in electrical system)
Causes
Clogged air cleaner element
Defective contact of valve and valve seat
Improper valve clearance
Seized turbocharger, interference of turbocharger
Worn piston ring, cylinder
Clogged air breather hole of fuel tank cap
Leaking or clogged fuel piping, entry of air
Clogging of fuel filter
Stuck, seized supply pump plunger
Clogged injector, defective spray
Questions
Confirm recent repair history
Degree of use of machine Operated for long period EE E E
Engine pick-up suddenly became worse wQQ Q
Non-specified fuel is being used www
Replacement of filters has not been carried out according to Operation and Maintenance
Manual
ww
Oil must be added more frequently w
Dust indicator is red w
Air breather hole of fuel tank cap is clogged w
Rust and water are found when fuel tank is drained w
Fuel is leaking from fuel piping w
When priming pump is operated, it makes no reaction or it is heavy wQ
Check items
When exhaust manifold is touched immediately after starting engine, temperature of some
cylinders is low
Qw
Color of exhaust gas is
Blue under light load w
Black wQ w w
When engine is cranked, abnormal sound is generated around cylinder head w
When engine is cranked, interference sound is generated around turbocharger w
High idle speed under no load is normal, but speed suddenly drops when load is applied Qw
There is hunting from engine (rotation is irregular) QQQ
Blow-by gas is excessive w
Troubleshooting
Inspect air cleaner directly q
When compression pressure is measured, it is found to be low qq
Inspect valve clearance directly q
When turbocharger is rotated by hand, it is found to be heavy q
When air is bled from fuel system, air comes out q
Inspect fuel filter directly q
Carry out troubleshooting according to “No-pressure feed by supply pump (*1)” indicated by
code
q
When a cylinder is cut out for reduced cylinder mode operation, engine speed does not change q
Remedy
Clean
Correct
Adjust
Replace
Replace
Clean
Correct
Clean
Replace
Replace
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