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Kubota D902 Troubleshooting

Engine Model: Kubota D902
Engine Type: 4-cycle 3-cylinder liquid-cooled diesel engine
Total Displacement: 54.8 (0.9 L)
Rated Engine Power: 24.8 Hp (18.5 kW) at 3800 rpm
Aspiration Type: Naturally aspirated


Engine starts up hard or will not start

Clogged fuel filter - Change filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Dirty or faulty injection nozzles - Change fuel injection nozzles.
Fuel injection pump is not working correctly - Replacement or repair required.

Diesel starts but immediately stops

Dirty fuel filter - Filter maintenance required.
Fuel injection pump is defective - Repair or install new pump.
Plugged air cleaner - Clean or replace element.

Engine stalls while running

Fuel injection pump timing is not adjusted - Adjust the pump as required.
Clogged fuel filter - Change the filter element.
Low coolant temperature - Warm up the engine.

Engine stalls at idle

Incorrectly set low idle speed - Correct low idle adjustment.
Valve out of adjustment - Check and adjust.
Fuel injection pump malfunction - Replace injection pump or repair it.

Reduced engine power

Faulty or dirty injection nozzles - Replace injection nozzles.
Restricted fuel hoses or lines - Fuel lines and hoses need to be cleaned.
Air filter plugged - Carry out maintenance on air filter.
Cylinder head gasket defective - Change cylinder head gasket.

Engine overheats

Dirty radiator core or faulty radiator cap - Clean radiator or change cap.
Lack of engine coolant - Fill radiator to proper level and check components for faults.
Fan belt slipping or worn - Belt change is required.
Insufficient engine oil - Fill up the engine oil.

Oil pressure is insufficient

Engine oil level low - Fill the crankcase with oil.
Oil pump is damaged - Inspect and change as required.
Oil filter element clogged - Clean or change engine oil filter.

Engine consuming too much oil

Oil leakage: Damaged gaskets or seals - New components need to be installed.
Oil viscosity is incorrect - Fill up with the correct oil viscosity.
Stuck or defective piston rings - Piston rings replacement required.
Damaged valve guides or valve stems - Need to replace the valves.
Damaged cylinder liners or pistons - Inspect liners and pistons, fit new parts as necessary.

Engine knocking sound or abnormal noise

Low coolant temperature - Warm up engine as required.
Engine oil level low - Check and refill engine oil.
Improper fuel injection timing - Adjust the pump as required.
Piston wear or scoring - Replace the pistons.
Connecting rod is worn or not aligned - Alignment procedure or replacement is required.

Starter motor turns slow

Battery power is low - Battery needs to be recharged.
Battery will not hold charge - Service or replace the battery.
Disconnected cables or faulty battery terminals - Connect wires properly or change terminals.

Starter motor won't turn

Battery is drained or worn - Battery needs to be recharged or replaced.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Battery power is low - Battery is drained, charge it.
Starter motor failing - Starter needs to be changed.