Kubota D1703 Troubleshooting
| Engine Model: Kubota D1703 |
| Engine Type: 4-cycle vertical 3-cylinder liquid-cooled diesel |
| Total Displacement: 100.5 cu.in (1.65 L) |
| Rated Engine Power: 30 Hp (22.4 kW) at 3000 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine hard to start or doesn't start |
Clogged fuel filter - Install new filter element.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are faulty or clogged - Inspect nozzles and replace if necessary.
Fuel injection pump is faulty - Repair or replace injection pump.
Wrong valve timing - Set the valve timing correctly.
Restricted fuel pipes - Clean or replace fuel pipes.
Injection timing is out of adjustment - Adjust injection timing as required.
Worn cylinder or piston rings - Change faulty components.
| Engine starts but then stops |
Fuel filter plugging - Filter maintenance required.
Fuel injection pump is defective - Install a new fuel pump or repair.
Clogged air cleaner - Clean or change the filter.
Incorrect nozzle opening pressure - Set up as recommended.
| Engine stops suddenly during operation |
Improper fuel injection timing - Check the fuel injection pump timing adjustment.
Fuel filter plugging - Clean the filter element.
Engine is not fully warmed up - Warm up engine as required.
Injection nozzles are jammed or clogged - Clean or replace injection nozzles.
Improperly adjusted low idle speed - Adjustment required.
Excessive valve clearance - Adjust valve clearance.
Faulty fuel injection pump - Change or repair the pump.
Dirty or damaged injection nozzles - Change fuel injection nozzles.
Fuel hoses or lines are dirty - Clean fuel system lines and hoses.
Plugged air filter - Change air filter element.
Blown cylinder head gasket - Replace the gasket as required.
Improper injection timing - Adjust injection timing as required.
Fuel injection pump is faulty - Change pump or rebuild it.
One of moving engine parts is faulty - Replace or repair damaged components.
Radiator fins are dirty or radiator cap is defective - Replace cap or clean radiator.
Low engine coolant - Add coolant fluid to cooling system and also check it for leaks.
Fan belt is broken or worn - Belt change is required.
Insufficient engine oil - Check and refill engine oil.
Worn cylinder head gasket - Cylinder-head gasket replacement required.
Improper injection timing - Adjust injection timing as required.
| Insufficient oil pressure |
Oil level is low - Fill crankcase to proper oil level.
Worn oil pump - Replace as required.
Plugged engine oil filter - Replace or clean engine oil filter element.
Stuck or worn relief valve - Relief valve need to be replaced or cleaned.
Excessive oil clearance of crankshaft bearing - Test and repair or replace worn parts.
Clearance of crankpin bearing is excessive - Inspect and change or repair worn components.
Oil leaks: Worn seals or gaskets - Replace worn parts to avoid leaks.
Oil viscosity is incorrect - Use correct viscosity oil.
Stuck or worn piston rings - Piston rings need to be replaced.
Worn valve guides and valve stems - Replace the valves.
Cylinder liners or pistons are scored - Check pistons and liners, install new parts as required.
| Abnormal engine knocking or noise |
Coolant temperature is low - Warm up to required temperature.
Not enough engine oil - Add oil to the engine crankcase.
Incorrect adjustment of fuel injection pump timing - Adjust the pump as required.
Broken or worn pistons - Pistons need to be replaced.
Connecting rod misalignment or failure - Connecting rod must be aligned or replaced.
Battery voltage is low - Low battery charging, charge as required.
Battery will not hold charge - Service charging system or replace battery.
Bad terminals or disconnected battery cables - Connect wires properly or change terminals.
Battery is discharged or defective - Charge or change the battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Low battery power - Battery needs to be recharged.
Starter motor failure - Change or repair starter.
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