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Kubota D600 Troubleshooting

Engine Model: Kubota D600
Engine Type: 4-cycle 3-cylinder liquid-cooled diesel engine
Total Displacement: 36.6 (0.6 L)
Rated Engine Power: 14.0 Hp (10.3 kW) at 3200 rpm
Aspiration Type: Naturally aspirated


Engine starts up hard or will not start

Clogged fuel filter - Replace filter element.
Air trapped in fuel system - Bleed air.
Clogged or burnt injection nozzle - Check injection nozzles and replace if required.
Fuel injection pump failure - Replace or repair injection pump.

Diesel starts but immediately stops

Fuel filter element is dirty - Change filter element.
Faulty fuel injection pump - Replace or rebuild injection pump.
Air filter plugged - Clean or change.

Engine stops running suddenly

Fuel injection pump timing is wrong - Check the fuel injection pump timing adjustment.
Fuel filter element clogging - Replace the filter element.
Engine not warmed up - Warm up to required temperature.

Engine shuts off while idling

Incorrect low idle setting - Adjustment required.
The valve clearance is incorrect - Adjustment procedure required.
Fuel injection pump is not working correctly - Change pump or rebuild it.

Reduced engine power

Fuel injection nozzles fault - Check and replace nozzles if required.
Fuel lines or hoses clogging - Clean fuel lines and hoses.
Restricted intake air - Service air cleaner.
Cylinder head gasket is blown - Change cylinder head gasket.

Engine is overheated

Radiator fins are dirty or radiator cap is defective - Clean radiator or install new cap.
Low coolant level - Fill radiator to proper level and check components for faults.
Fan belt is worn or faulty - The fan belt needs to be replaced.
Engine oil level is low - Check oil level and add oil as required.

Oil pressure too low

Oil level is insufficient - Check oil level and add oil as required.
Defective oil pump - Install a new pump.
Dirty oil filter - Replace or clean engine oil filter element.

High engine oil consumption

External oil leaks: Seals or gaskets are wearing excessively - Replace defective parts.
Oil viscosity is incorrect - Use correct viscosity oil.
Worn or broken piston rings - Piston rings replacement required.
Worn valve stems and valve guides - Replace defective valves.
Pistons or cylinder liners are worn - Check liners and pistons, replace as required.

Engine noise or knocking

Engine not warmed up - Warm up to required temperature.
Engine oil level is insufficient - Need to add engine oil.
Improper fuel injection timing - Check the fuel injection pump timing adjustment.
Piston wear or scoring - Replace the pistons.
Misaligned or faulty connecting rod - Need to align or replace the connecting rod.

Starter motor cranks slow

Battery power is low - Low battery charging, charge as required.
Battery will not hold charge - Battery needs to be serviced or replaced.
Faulty battery terminals or disconnected cables - Check cable connections and replace or service terminals.

Starter is not working

Battery is drained or worn - Recharge or change battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Low battery capacity - Recharge the battery.
Starter motor is defective - Repair or change starter.