Kubota D1803-M-DI Troubleshooting
| Engine Model: Kubota D1803-M-DI |
| Engine Type: 4-cycle vertical 3-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 111.4 cu.in (1.83 L) |
| Rated Engine Power: 37.4 Hp (27.9 kW) at 2700 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine difficult to start or won't start |
Clogged fuel filter - Change the filter element.
Air in the fuel lines - Bleed the fuel lines.
Fuel injection nozzles are clogged or faulty - If necessary, replace with a new nozzle.
Fuel injection pump failure - Change pump or rebuild it.
Valve timing is improper - Correct or replace timing gear.
Fuel pipes are plugged - Clean fuel pipes.
Improper injection timing - Set up as recommended.
Piston rings and cylinder are worn - Change defective components.
| Engine starts and then shuts off |
Clogged fuel filter - Replace filter element.
Fuel injection pump is defective - Replace or rebuild injection pump.
Air filter element clogged - Clean or change.
Incorrect nozzle opening pressure - Set it correctly.
| Engine stalls after running |
Improper fuel injection timing - Use the correct fuel injection pump timing adjustment.
Fuel filter plugging - Install new filter element.
Engine is not fully warmed up - Normalize the temperature by warming up the engine.
Stuck or burnt injection nozzle - Clean or replace injection nozzles.
| Engine stops at low idle speed |
Incorrect low idle speed adjustment - Adjust low idle speed.
The valve clearance is not adjusted - Adjust valve clearance.
Damaged fuel injection pump - Repair or change injection pump.
| Diesel engine is losing power |
Faulty or dirty injection nozzles - Install a new kit of correctly balanced nozzles.
Fuel hoses or lines are clogged - Clean fuel lines and hoses.
Clogged air filter - Carry out maintenance on air filter.
Defective cylinder head gasket - Cylinder-head gasket replacement required.
Incorrect injection timing - Check injection timing adjustment.
Faulty fuel injection pump - Rebuild or install a new injection pump.
One of moving engine components is worn - Replace or repair damaged components.
Defective radiator cap or clogged radiator core - Change cap or clean radiator.
Insufficient coolant - Fill the cooling system and check components for leaks or other faults.
Fan belt is worn or faulty - Replace the fan belt.
Engine oil level is insufficient - Checking oil level and add if necessary.
Cylinder head gasket is defective - Change cylinder head gasket.
Wrong injection timing - Set up as recommended.
Lack of oil - Fill up the engine oil.
Oil pump is damaged - Inspect and change as required.
Engine oil filter is plugged - Service or change engine oil filter element.
Relief valve is stuck or worn - Change or service relief valve.
Crankshaft bearing clearance is excessive - Inspect and change or repair worn components.
Crankpin bearing clearance is excessive - Test and replace or repair worn components.
| Excessive engine oil consumption |
Oil leaking: Damaged seals or gaskets - To repair leaks, replace worn parts.
Improper oil viscosity - Use oil of correct viscosity.
Piston rings are seized or worn - Have piston rings replaced.
Worn valve stems and valve guides - Change the valves.
Pistons or cylinder liners are damaged - Inspect pistons and liners, fit new components as necessary.
Low coolant temperature - Normalize the temperature by warming up the engine.
Insufficient engine oil - Checking oil level and add if necessary.
Fuel injection pump timing is not adjusted - Set up as recommended.
Scored or worn pistons - Install new pistons.
Connecting rod is misaligned or defective - Replace or align connecting rod.
Low battery capacity - Low battery charging, charge as required.
Battery will not hold charge - Service or change the battery.
Bad terminals or disconnected battery cables - Connect cables properly or replace terminals.
Battery is discharged or worn - Charge or change the battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Low battery power - Low battery charging, charge as required.
Faulty starter motor - Starter should be replaced.
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