8. Fuel system
133
Failure Diagnosis
Governor
Electric type
Fuel feed
pump
Type
Mechanical type injection pump
Capacity
(L/hr)
630
Injection noz-
zle
Type
Multi hole type
Opening pres-
sure (MPa)
28
Fuel filter
Full flow, Cartridge type with water drain valve
Fuel Used
Diesel fuel oil
Item
DP222L
Remarks
DP222LAS
DP222LBS
DP222LBF
DP222LCS
DP222LCF
Symptom
Causes
Troubleshooting
1. Engine does not start
A. Fuel is not supplied from
the fuel delivery pump
B. Fuel is not injected from
the fuel injection pump
C. Improper fuel injection tim-
ing
D. Fuel injection nozzle not
working
•
Clogged fuel pipe, or air entered the fuel pipe line
•
Defective delivery pump valve
•
Seized delivery pump piston or push rod
•
Correct
•
Replace
•
Disassemble / correct
•
Clogged fuel filter cartridge
•
Air entered to the fuel filter or injection pump
•
Seizure or defect in the plunger or delivery valve
•
Clean / replace
•
Bleed
•
Disassemble / correct
•
Defective installation of fuel injection pump bracket
•
Defective adjustment of the fuel injection pump
tappet
•
Excessively worn cam of camshaft
•
Inspect / correct
•
Inspect / correct
•
Replace
•
Seizure of needle valve of nozzle
•
Fuel leakage between nozzle and needle valve
•
Improper fuel injection pressure
•
Service or replace
•
Service or replace
•
Adjust
2. Engine starts but stops
immediately
•
Clogged fuel filter or clogged pipe between fuel
delivery pump and injection pump
•
Air entered into fuel
•
Insufficient supply of oil by fuel delivery pump
•
Clogged air breather in fuel tank, causing insuffi-
cient fuel supply.
•
Clean or replace
•
Air bleeding
•
Disassemble / correct
•
Replace breather
3. Insufficient engine power
•
Excessively work plunger
•
Improper injection timing
•
Defective delivery valve
•
Excessive fuel leakage in injection nozzle
•
Nozzle not working properly
•
Replace
•
Adjust
•
Replace
•
Service or replace
•
Disassemble / correct
4. Engine knocking occurs
•
Early injection timing
•
High nozzle injection pressure
•
Nozzle not working properly
•
Adjust
•
Adjust
•
Disassemble / correct