0A–26 GENERAL INFORMATION
Condition Possible Cause Correction
Trouble in the engine stop
mechanism
Trouble in the fuel system
Trouble in the valve gear train
Low compression pressure
Poor return of the engine stop button
Fuel system leakage or blockage
Air in the fuel system
Water particles in the fuel
Clogged fuel filter element
Injection nozzle sticking
Injection nozzle starting pressure too
low
Improper spray condition
Defective delivery valve resulting in fuel
drippage after fuel injection
Injection timing improperly adjusted
Insufficient injection volume
Broken plunger spring of the injection
pump
Worn plunger of the injection pump
Worn camshaft of the injection pump
Worn roller tappet of the injection pump
Valve clearance improperly adjusted
Worn camshaft
Blown out cylinder head gasket
Worn cylinder liner
Piston ring sticking or broken
Improper seating between the valve and
valve seat
Completely return the engine stop
button
Repair or replace the fuel system
Bleed the air from the fuel system
Replace fuel
Replace the fuel filter element or
cartridge
Replace the injection nozzle
Adjust or replace the injection nozzle
Replace the delivery valve
Adjust the injection timing
Adjust the injection volume
Replace the plunger spring
Replace the plunger assembly
Replace the camshaft
Replace the roller tappet
Adjust the valve clearance
Replace the camshaft
Replace the related parts
2. Unstable Idling
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