Kubota Z600 Troubleshooting
| Engine Model: Kubota Z600 |
| Engine Type: 4-cycle vertical 2-cylinder liquid-cooled diesel |
| Total Displacement: 34.8 cu.in (0.57 L) |
| Rated Engine Power: 12.5 Hp (9.3 kW) at 3500 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine difficult to start or won't start |
Fuel filter element clogging - Change filter element.
Air trapped in fuel system - Bleed air.
Clogged or defective injection nozzles - Change fuel injection nozzles.
Fuel injection pump is not operating properly - Change pump or rebuild it.
Wrong valve timing - Set the valve timing correctly.
Fuel pipes clogging - Clean fuel pipes.
Injection timing is improper - Adjust as recommended.
Piston rings and cylinder are worn - Replace faulty components.
| Engine starts but then stops |
Fuel filter plugged - Clean or replace the filter.
Fuel injection pump malfunction - Rebuild or install a new injection pump.
Air filter is dirty - Clean or replace the element.
Improper nozzle opening pressure - Set it correctly.
| Engine shuts off suddenly while running |
Fuel injection timing is not adjusted - Set it up as required.
Fuel filter plugged - Clean the filter or install new filter element.
Coolant temperature is low - Warm up the engine.
Injection nozzles are burnt or jammed - Clean or replace injection nozzles.
Wrong adjustment of low idle speed - Adjust the low idle speed.
The valve clearance is not adjusted - Correct valve clearance needs to be set.
Fuel injection pump damage - Rebuild or change fuel pump.
Fuel injection nozzles fault - Install a new kit of correctly balanced nozzles.
Fuel hoses or lines clogging - Clean fuel system hoses and lines.
Restricted intake air - Clean or change.
Damaged cylinder-head gasket - Gasket should be replaced.
Incorrect injection timing - Set up as recommended.
Fuel injection pump is faulty - Rebuild or change fuel pump.
Any of moving engine components is faulty - Replace or repair damaged components.
Dirty radiator core or faulty radiator cap - Replace cap or clean radiator.
Low engine coolant - Add coolant fluid to cooling system and also check it for leaks.
Fan belt is loose or defective - Fan belt must be replaced.
Insufficient engine oil - Add oil to the engine crankcase.
Blown cylinder head gasket - Cylinder-head gasket replacement required.
Incorrect injection timing - Set up as recommended.
| Oil pressure is insufficient |
Low oil level - Check oil level and add oil as required.
Worn oil pump - Remove and inspect oil pump.
Oil filter clogged - Service or replace engine oil filter.
Relief valve is seized or worn - Replace or service relief valve.
Excessive oil clearance of crankshaft bearing - Test and repair or replace worn parts.
Excessive oil clearance of crankpin bearing - Test and repair or replace worn parts.
| Excessive oil consumption |
Oil leakage: Damaged gaskets or seals - Change worn parts according to specifications.
Crankcase oil too light - Use correct viscosity oil.
Stuck or worn piston rings - Change the piston rings as required.
Damaged valve guides or valve stems - Need to replace the valves.
Cylinder liners or pistons are scuffed - Inspect liners and pistons, replace as necessary.
Engine not warmed up - Normalize the temperature by warming up the engine.
Not enough engine oil - Fill up the engine oil.
Improper fuel injection timing - Set up as recommended.
Pistons are worn or scored - Pistons need to be replaced.
Connecting rod is worn or not aligned - Align or replace connecting rod.
Low battery capacity - Recharge the battery.
Battery runs out quickly - Service battery or replace it.
Battery terminals are corroded or wires are disconnected - Check cable connections and replace or service terminals.
Battery is discharged or worn - Replace or charge as required.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery power - Charge the battery.
Faulty starter motor - Repair or replace starter.
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