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Kubota D662 Troubleshooting

Engine Model: Kubota D662
Engine Type: 4-cycle 3-cylinder liquid-cooled diesel engine
Total Displacement: 40.1 (0.66 L)
Rated Engine Power: 19.2 Hp (14.3 kW) at 3800 rpm
Aspiration Type: Naturally aspirated


Engine starts up hard or doesn't start

Clogged fuel filter - Install new filter element.
Air in fuel tank - Bleed fuel tank.
Faulty or dirty injection nozzles - If necessary, replace with a new nozzle.
Damaged fuel injection pump - Rebuild or replace pump.

Engine starts but then stalls

Clogged fuel filter - Replace filter element.
Fuel injection pump is damaged - Change or repair the pump.
Air filter is dirty - Clean or replace element.

Engine stalls while running

Improper setting of fuel injection pump timing - Adjust according to specifications.
Fuel filter plugging - Install new filter element.
Engine is not fully warmed up - Warm up to required temperature.

Engine stalls at idle

Improperly adjusted low idle speed - Correct low idle settings.
The valve clearance is incorrect - Adjustment procedure required.
Fuel injection pump is damaged - Install a new pump or rebuild.

Engine power is reduced

Damaged or dirty injection nozzles - Inspect nozzles and replace if necessary.
Restricted fuel lines or hoses - Clean fuel system hoses and lines.
Air filter element clogged - Clean or replace element.
Cylinder-head gasket is leaking - Install a new gasket.

Engine overheated

Faulty radiator cap or dirty radiator fins - Install new cap or clean radiator.
Insufficient coolant fluid - Fill radiator to proper level and check components for faults.
Excessive wear of the fan belt - Change the fan belt.
Engine oil level is insufficient - Fill the crankcase with engine oil.

Low oil pressure

Not enough oil in the engine - Fill the crankcase with oil.
Worn oil pump - Remove and inspect oil pump.
Oil filter element clogging - Service or change engine oil filter element.

Diesel engine using too much oil

Oil leaking: Seals or gaskets are defective - Replace to repair leaks.
Incorrect oil viscosity - Use correct viscosity oil.
Seized or wear piston rings - Piston rings replacement required.
Damaged valve guides or valve stems - Replace defective valves.
Worn cylinder liners or pistons - Check pistons and liners, replace as required.

Engine noises or knocks

Engine not warmed up - Warm up the engine.
Engine oil level is low - Fill the crankcase with engine oil.
Improper setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Pistons are worn or scored - Pistons replacement required.
Connecting rod is worn or not aligned - Alignment procedure or replacement is required.

Starter motor cranks slow

Battery capacity is low - Recharge the battery.
Battery drains quickly - Service or replace the battery.
Battery terminals are corroded or wires are disconnected - Connect wires correctly or change terminals.

Starter motor is not working

Battery is discharged or defective - Need to charge or replace the battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Low battery capacity - Charge the battery.
Faulty starter motor - Repair or change starter.