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PAGE 58 — DA7000 SERIES GENERATORS• OPERATION AND PARTS MANUAL — REV. #5 (01/20/11)
Table 10. Engine Troubleshooting (Continued)
SYMPTOM POSSIBLE PROBLEM SOLUTION
Engine revolution is not
smooth
Fuel fi lter clogged or dirty? Clean or change.
Air cleaner clogged? Clean or change.
Fuel leak due to loose injection pipe retaining
nut?
Tighten nut.
Injection pump malfunctioning? Repair or replace.
Incorrect nozzle opening pressure? Adjust.
Injection nozzle stuck or clogged? Repair or replace.
Fuel over fl ow pipe clogged? Clean.
Governor malfunctioning? Repair.
Either white or
blue exhaust gas is
observed.
Excessive engine oil? Reduce to the specifi ed level.
Piston ring and liner worn or stuck? Repair or replace.
Incorrect injection timing? Adjust.
Defi cient compression? Adjust top clearance.
Either black or dark
gray exhaust gas is
observed.
Overload? Lessen the load.
Low grade fuel used? Use the specifi ed fuel.
Fuel fi lter clogged? Clean or change.
Air cleaner clogged? Clean or change.
Defi cient nozzle injection? Repair or replace the nozzle.
Defi cient output.
Incorrect injection timing? Adjust.
Engine's moving parts seem to be seizing? Repair or replace.
Uneven fuel injection? Repair or replace the injection pump.
Defi cient nozzle injection? Repair or replace the nozzle.
Compression leak?
Replace head gasket, tighten cylinder head
bolt, glow plug and nozzle holder.
TROUBLESHOOTING (ENGINE)