Kubota Z400-B Handbuch Seite 90

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[5J TROUBLESHOOTING
Reference
Symptom Probable Cause Solution
Page
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Engine does not start Replenish fuel
• No fuel
S-31 , S-129
• Air in the fuel system Vent air
Replace fuel and repair or replace fuel system • Water in the fuel system
Clean
• Fuel pipe clogged
S-33
Clean or replace
• Fuel filter clogged
• Excessively high viscosity of fuel or Use the specified fuel or engine oil
engine oil at low temperature
Use the specified fuel
• Fuel with low cetane number
Tighten nut
retaining nut
• Fuel leak due to loose injection pipe
S-119
• Incorrect injection timing Adjust
Replace • Fuel cam shaft worn
S-123, S-125
• Injection nozzle clogged Clean
S-121, S-123 Repair or replace
• Injection pump malfunctioning
• Fuel feed pump malfunctioning Repair or replace
• Seizure of crankshaft, camshaft, piston, Repair or replace
cylinder liner or bearing
S-43, S-61
glow plug and nozzle holder
• Compression leak from cylinder Replace head gasket, tighten cylinder head bolt,
S-87, S-89
broken, valve seized
• Improper valve seat alignment, valve spring
Repair or replace
S-91
S-75
• Improper valve timing Correct or replace timing gear
S-97 , S-109
• Piston ring and liner worn Replace
• Excessive valve clearance S-43, S-63,
S-87
Adjust
[Starter does not work]
• Battery discharged
Charge
• Starter malfunctioning
Repair or replace S-131
• Starter switch malfunctioning Repair or replace
• Wiring disconnected Connect
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Engine revolution is not
• Fuel filter clogged or dirty
Clean or replace S-33
smooth
• Air cleaner clogged
Clean or replace 5-41
• Fuel leak due to loose injection pipe Tighten nut
retaining nut
• Injection pump malfunctioning
Repair or replace
S-121, S-123
• Incorrect nozzle opening pressure
Adjust S-123, S-125
• Injection nozzle stuck or clogged
Repai r or repl ace 8-125,8-127
• Fuel over flow pipe clogged Clean
• Governor
malfunctio~,
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Repair
Either white or blue
• Excessive engine oil Reduce to the specified level S-29
exhaust gas is observed
• Piston ring and liner worn or stuck Repair or replace S-97, S-109
• Incorrect injection timing Adjust 8-119
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• Deficient
,-v, ...... ",.,v" Adjust top clearance • 8-61, S-85
Ei ther black or dark
• Overload
Lessen the load
gray exhaust gas is
• Low grade fuel used
Use the specified fuel
observed
• Fuel filter clogged
Clean or replace 8-33
1.
Air cleaner
cI~d
Clean or replace S-41
Deficient output • Incorrect injection timing Adjust
8-119
• Engine's moving parts seem to be seizing Repair or replace
• Uneven fuel injection
Repair or replace the injection pump S-121, S-123
• Deficient nozzle injection
Repair or replace the nozzle S-123,8-125
• Compression leak
Replace head gasket, tighten cylinder head S-43, S-61
bolt. glow plug and nozzle holder
8-8