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Kubota D1403 Troubleshooting
| Engine Model: Kubota D1403 |
| Engine Type: 4-stroke 3-cylinder water-cooled diesel engine |
| Total Displacement: 85 cu.in (1.4 L) |
| Rated Engine Power: 31 Hp (23.1 kW) at 3000 rpm |
| Fuel System: Indirect fuel injection |
| Engine hard to start or won't start |
Fuel filter element clogging - Filter maintenance required.
Air in the fuel pipes - Bleed the fuel pipes.
Fuel injection nozzles fault - Replace injection nozzles.
Fuel injection pump is damaged - Replace injection pump or repair it.
Valve timing is improper - Adjust or change timing gear.
Clogged fuel pipes - Clean fuel pipes.
Injection timing is improper - Check injection timing adjustment.
Excessive wear of piston rings and cylinder - Change faulty parts.
| Engine stalls after starting |
Fuel filter element clogging - Filter maintenance required.
Fuel injection pump malfunctioning - Repair or install new pump.
Clogged air cleaner - Clean or replace element.
Unadjusted nozzle opening pressure - Set up as recommended.
| Engine shuts off suddenly while running |
Timing of fuel injection pump is incorrect - Set up as recommended.
Fuel filter element is dirty - Change filter element.
Engine is not preheated - Warm up engine as required.
Injection nozzles sticking or clogged - Change or repair injection nozzles.
| Engine stops while idling |
Low idle speed set incorrectly - Correct the settings.
The valve clearance is incorrect - Adjust valve clearance.
Damaged fuel injection pump - Change or repair the pump.
Fuel injection nozzles are damaged - Replace injection nozzles.
Fuel lines or hoses clogging - Clean fuel system hoses and lines.
Air filter is dirty - Change air filter element.
Blown cylinder head gasket - Install new cylinder head gasket.
Injection timing is incorrect - Adjust as recommended.
Fuel injection pump is broken - Replace or repair injection pump.
Any of moving engine components is faulty - Change or repair damaged parts.
Damaged radiator cap or dirty radiator core - Install new cap or clean radiator.
Lack of coolant in cooling system - Add coolant fluid and inspect the cooling system for leaks.
Fan belt is loose or defective - Change as required.
Insufficient engine oil - Add oil to the engine crankcase.
Worn cylinder head gasket - Cylinder-head gasket replacement required.
Injection timing is improper - Adjust injection timing as required.
Lack of oil - Check oil level and add oil as required.
Oil pump is worn or damaged - Check and replace if necessary.
Clogged oil filter - Replace or clean engine oil filter element.
Stuck or worn relief valve - Change or service relief valve.
Crankshaft bearing clearance is excessive - Test and repair or replace worn parts.
Crankpin bearing clearance is excessive - Test and repair or replace worn parts.
| High engine oil consumption |
Oil leakage: Gaskets or seals can be faulty - Replace to repair leaks.
Incorrect oil viscosity - Fill up with the correct oil viscosity.
Worn or broken piston rings - Change the piston rings as required.
Worn valve guides and valve stems - Valves must be replaced.
Cylinder liners or pistons are scuffed - Check liners and pistons, change as required.
Low coolant temperature - Warm up the engine.
Engine oil insufficient - Add oil to the engine crankcase.
Incorrect adjustment of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Piston wear or scoring - Replace the pistons.
Connecting rod is worn or misaligned - Need to replace or align the connecting rod.
Battery voltage is low - Low battery charging, charge as required.
Battery won’t hold charge - Service charging system or install new battery.
Bad terminals or disconnected battery cables - Connect cables properly or replace terminals.
| Starter motor is not working |
Battery is low or faulty - Recharge or replace battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery voltage - Battery needs to be recharged.
Starter motor failing - Repair or replace starter.
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