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| Home / Engines / Kubota Engines / Kubota D1503 |
Kubota D1503 Troubleshooting
| Engine Model: Kubota D1503 |
| Engine Type: 4-cycle vertical 3-cylinder water-cooled diesel engine |
| Total Displacement: 91.4 cu.in (1.5 L) |
| Rated Engine Power: 30.5 Hp (22.8 kW) at 3000 rpm |
| Fuel System: Indirect fuel injection |
| Engine starts hard or doesn't start |
Fuel filter plugged - Change the filter element.
Air in fuel system - Bleed fuel system.
Fuel injection nozzles are damaged or dirty - If necessary, replace with a new nozzle.
Fuel injection pump is not operating properly - Change or repair the pump.
Incorrect valve timing - Set the valve timing correctly.
Dirty fuel pipes - Clean or replace fuel pipes.
Injection timing is incorrect - Set up as recommended.
Excessive wear of piston rings and cylinder - Replace faulty components.
| Diesel starts but immediately stops |
Clogged fuel filter - Clean the filter element.
Fuel injection pump is defective - Install a new pump or rebuild.
Dirty air cleaner - Clean air cleaner element.
Improper nozzle opening pressure - Adjust as recommended.
| Engine shuts off suddenly during operation |
Wrong setting of fuel injection pump timing - Set up as recommended.
Fuel filter element is clogged - Change the filter element.
Engine has not warmed up to the recommended temperature - Engine is not warmed up to the required temperature.
Stuck or clogged injection nozzle - Repair or replace injection nozzles.
| Engine stops while idle |
Incorrect low idle speed adjustment - Adjust as required.
Valve clearance is not correct - Correct valve clearance.
Fuel injection pump malfunctioning - Install a new pump or rebuild.
| Engine power is insufficient |
Dirty or damaged injection nozzles - Clean or replace injection nozzles.
Clogged fuel hoses or lines - Fuel lines and hoses need to be cleaned.
Plugged air filter - Replace air filter element.
Cylinder head gasket is blown - Gasket should be replaced.
Injection timing is out of adjustment - Set up as recommended.
Faulty fuel injection pump - Repair or install new pump.
Any of moving engine components is faulty - Replace or repair damaged components.
| Engine is overheated |
Faulty radiator cap or dirty radiator fins - Clean radiator or change cap.
Low coolant level - Fill radiator to proper level and check components for faults.
Fan belt is worn or faulty - If necessary, replace the belt.
Engine oil level is insufficient - Add oil to the engine crankcase.
Damaged cylinder-head gasket - Change cylinder head gasket.
Injection timing is improper - Adjust as recommended.
| Oil pressure is low |
Oil level is insufficient - Check and refill the oil.
Oil pump failure - Install a new pump.
Dirty oil filter element - Clean or replace engine oil filter element.
Relief valve is defective or dirty - Relief valve need to be replaced or cleaned.
Excessive oil clearance of crankshaft bearing - Inspect and replace or repair faulty components.
Excessive crankpin bearing clearance - Test and replace or repair worn components.
| Excessive oil consumption |
External oil leaks: Gaskets or seals can be faulty - Change to repair leaks.
Oil viscosity is wrong - Use oil of correct viscosity.
Stuck or worn piston rings - Have piston rings replaced.
Valve stems and guides are worn - Need to replace the valves.
Pistons or cylinder liners are damaged - Inspect liners and pistons, change as necessary.
| Engine knocking sound or abnormal noise |
Coolant temperature is low - Warm up engine as required.
Engine oil level is insufficient - Add oil to the engine crankcase.
Fuel injection pump timing is wrong - Set the fuel pump timing correctly.
Pistons are worn or broken - Pistons need to be replaced.
Misaligned or faulty connecting rod - Need to replace or align the connecting rod.
| Starter motor cranks slow |
Battery voltage is low - Low battery charging, charge as required.
Battery runs out quickly - Service battery or change it.
Corroded battery terminals or disconnected wires - Connect wiring correctly or install new terminals.
| Starter will not crank |
Battery is discharged or worn - Battery needs to be recharged or replaced.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Battery capacity is low - Low battery charging, charge as required.
Starter motor is faulty - Starter needs to be replaced.
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