Kubota D1403 Troubleshooting
| Engine Model: Kubota D1403 |
| Engine Type: 4-cycle vertical 3-cylinder liquid-cooled diesel |
| Total Displacement: 85 cu.in (1.39 L) |
| Rated Engine Power: 25 Hp (18.5 kW) at 3000 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine starts up hard or will not start |
Clogged fuel filter - Replace filter element.
Air in the fuel system - Air bleeding.
Clogged or defective injection nozzles - Test injection nozzles and change if necessary.
Fuel injection pump damage - Rebuild or change fuel pump.
Unadjusted valve timing - Adjust or replace timing gear.
Fuel pipes are dirty - Clean fuel pipes.
Injection timing is incorrect - Check injection timing adjustment.
Damaged piston rings and cylinder - Replace faulty components.
| Engine starts but stalls suddenly |
Fuel filter element is clogged - Replace the filter element.
Fuel injection pump is damaged - Repair or replace injection pump.
Clogged air filter element - Clean or replace element.
Nozzle opening pressure is not adjusted - Set it correctly.
| Engine shuts off suddenly while running |
Fuel injection timing is not adjusted - Adjust the pump as required.
Fuel filter element is clogged - Filter maintenance required.
Low coolant temperature - Warm up the engine.
Injection nozzles are stuck or clogged - Repair or replace injection nozzles.
| Engine shuts off while idling |
Incorrect low idle speed adjustment - Correct the settings.
Incorrect valve clearance - Check and adjust as required.
Fuel injection pump damage - Rebuild or replace pump.
Damaged or dirty injection nozzles - Test injection nozzles and change if necessary.
Clogged fuel hoses or lines - Fuel hoses and lines must be clean.
Restricted intake air - Replace air filter element.
Damaged cylinder-head gasket - Install a new gasket.
Injection timing is out of adjustment - Set the injection timing correctly.
Fuel injection pump is broken - Rebuild or install a new injection pump.
Any of moving engine components is faulty - Repair or replace defective parts.
Damaged radiator cap or dirty radiator core - Replace cap or clean radiator.
Engine has a lack of coolant - Add coolant fluid to cooling system and also check it for leaks.
Broken or loose fan belt - Change the fan belt.
Low engine oil level - Fill up the oil to required level.
Cylinder head gasket is worn - Replace the gasket as required.
Wrong injection timing - Set the injection timing correctly.
Insufficient engine oil - Check and refill the oil.
Oil pump failure - Replace as required.
Engine oil filter is plugged - Replace or service engine oil filter.
Stuck or defective relief valve - Change or service relief valve.
Excessive oil clearance of crankshaft bearing - Test and repair or replace worn parts.
Crankpin bearing clearance is excessive - Test and repair or replace worn parts.
| Excessive engine oil consumption |
Oil leaking: Damaged gaskets or seals - Defective components must be replaced.
Oil viscosity is incorrect - Use oil of proper viscosity.
Damaged or seized piston rings - Have piston rings replaced.
Valve guides or stems are damaged - Need to replace the valves.
Damaged pistons or cylinder liners - Inspect liners and pistons, replace as necessary.
Coolant temperature is low - Warm up the engine.
Not enough engine oil - Fill the crankcase with engine oil.
Improper fuel injection timing - Set it up as required.
Piston wear or scoring - Pistons replacement required.
Faulty or misaligned connecting rod - Connecting rod needs to be aligned or changed.
Battery voltage is low - Battery needs to be recharged.
Battery is not holding charge - Service or replace the battery.
Battery cables are disconnected or terminals are faulty - Connect wires properly or change terminals.
Battery is drained or defective - Recharge or change battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery voltage - Charge the battery.
Starter motor failure - Starter needs to be changed.
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