Kubota D1402 Troubleshooting
| Engine Model: Kubota D1402 |
| Engine Type: 4-cycle vertical 3-cylinder liquid-cooled diesel |
| Total Displacement: 85.1 cu.in (1.39 L) |
| Rated Engine Power: 32 Hp (23.9 kW) at 2800 rpm |
| Aspiration Type: Naturally aspirated |
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| Diesel hard to start or doesn't start |
Fuel filter element clogging - Clean or change the filter.
Air in fuel system - Bleed fuel system.
Defective or clogged injection nozzle - If necessary, replace with a new nozzle.
Faulty fuel injection pump - Repair or install new pump.
Valve timing is wrong - Use correct valve timing adjustment.
Fuel pipes clogging - Clean fuel pipes.
Injection timing is wrong - Adjust according to specifications.
Piston rings and cylinder are worn - Change faulty parts.
| Engine starts but immediately stalls |
Fuel filter plugging - Change the filter element.
Fuel injection pump damage - Rebuild or change fuel pump.
Air cleaner is dirty - Clean or change the filter.
Incorrect nozzle opening pressure - Adjust according to specifications.
| Engine stalls while running |
Improper fuel injection timing - Set up as recommended.
Fuel filter plugged - Change the filter element.
Low coolant temperature - Warm up to required temperature.
Injection nozzles are burnt or jammed - Change or repair injection nozzles.
| Engine stalls while idling |
Low idle speed adjustment is incorrect - Adjust low idling as recommended.
Valve out of adjustment - Need to adjust valve clearance.
Fuel injection pump damage - Rebuild or change fuel pump.
| Engine power is insufficient |
Damaged or dirty injection nozzles - Change fuel injection nozzles.
Dirt in the fuel hoses or lines - Service fuel hoses and lines.
Air filter plugged - Service air cleaner.
Cylinder-head gasket is leaking - Install a new gasket.
Injection timing is out of adjustment - Adjust injection timing as required.
Faulty fuel injection pump - Install a new pump or rebuild.
Any of moving engine parts is worn - Repair or replace defective parts.
Radiator fins are dirty or radiator cap is defective - Clean radiator or replace cap.
Engine has a lack of coolant - Add coolant fluid to cooling system and also check it for leaks.
Broken or loose fan belt - Belt change is required.
Lack of engine oil - Check and refill engine oil.
Cylinder head gasket is damaged - Install a new gasket.
Injection timing is out of adjustment - Adjust injection timing as required.
Engine oil level low - Check oil level and add oil as required.
Worn oil pump - Inspect and change as required.
Dirty oil filter element - Replace or clean engine oil filter element.
Relief valve is defective or dirty - Replace or service relief valve.
Clearance of crankshaft bearing is excessive - Test and repair or replace worn parts.
Excessive oil clearance of crankpin bearing - Test and replace or repair worn components.
| Engine oil consumption is too high |
Oil leaking: Worn gaskets or seals - Replace to repair leaks.
Oil viscosity is incorrect - Use proper viscosity oil.
Stuck or defective piston rings - Change the piston rings as required.
Valve guides or stems are damaged - Replace defective valves.
Damaged pistons or cylinder liners - Check liners and pistons, change as required.
Low coolant temperature - Warm up to required temperature.
Engine oil insufficient - Fill the crankcase with engine oil.
Fuel injection pump timing is not adjusted - Set it up as required.
Broken or worn pistons - Pistons need to be replaced.
Misaligned or faulty connecting rod - Replace or align connecting rod.
Battery power is low - Battery needs to be recharged.
Battery discharges quickly - Service charging system or install new battery.
Wires are disconnected or battery terminals are corroded - Check cables and clean or change terminals.
| Starter motor is not working |
Battery is low or faulty - Charge or change the battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Battery capacity is low - Charge the battery.
Damaged starter motor - Repair or install a new starter.
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