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| Home / Engines / Kubota Engines / Kubota D650 |
Kubota D650 Troubleshooting
| Engine Model: Kubota D650 |
| Engine Type: 4-cycle vertical 3-cylinder water-cooled diesel engine |
| Total Displacement: 41.2 cu.in (0.68 L) |
| Rated Engine Power: 14.3 Hp (11.2 kW) at 3200 rpm |
| Fuel System: Fuel injection pump |
| Engine starts hard or doesn't start |
Fuel filter plugging - Change filter element.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are faulty or clogged - Install a new kit of correctly balanced nozzles.
Fuel injection pump is faulty - Replacement or repair required.
Wrong valve timing - Set the valve timing correctly.
Fuel pipes clogging - Service or replace fuel pipes.
Injection timing is wrong - Set up as recommended.
Worn cylinder or piston rings - Change faulty components.
| Engine starts but stalls immediately |
Fuel filter element clogging - Replace the filter element.
Damaged fuel injection pump - Rebuild or change fuel pump.
Air filter element clogged - Carry out maintenance on air filter.
Incorrect nozzle opening pressure - Adjust as recommended.
| Engine stalls after running |
Fuel injection timing is not adjusted - Use the correct fuel injection pump timing adjustment.
Fuel filter plugged - Replace the filter element.
Engine not warmed up - Warm up to required temperature.
Defective or stuck injection nozzles - Repair or replace injection nozzles.
| Engine stops while idle |
Incorrect low idle setting - Adjust low idle speed.
The valve clearance is not adjusted - Correct valve clearance.
Damaged fuel injection pump - Rebuild or replace pump.
| Diesel engine loses power |
Fuel injection nozzles are damaged or dirty - Install a new kit of correctly balanced nozzles.
Fuel hoses or lines are clogged - Clean fuel hoses and lines.
Plugged air filter - Replace air filter element.
Cylinder head gasket is defective - Replace cylinder head gasket.
Injection timing is improper - Adjust injection timing as required.
Fuel injection pump failure - Rebuild or change fuel pump.
Any of moving engine components is faulty - Change or repair damaged parts.
| Engine overheating |
Radiator core is dirty or radiator cap is damaged - Install new cap or clean radiator.
Engine has a lack of coolant - Add coolant and check the components of cooling system.
Broken or loose fan belt - Replace as required.
Low engine oil level - Fill up the engine oil.
Cylinder-head gasket is broken - Change cylinder head gasket.
Injection timing is incorrect - Set the injection timing correctly.
| Oil pressure too low |
Not enough oil in the engine - Need to add oil.
Defective oil pump - Repair or change.
Oil filter element is dirty - Replace or clean 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 parts.
Excessive crankpin bearing clearance - Inspect and change or repair worn components.
| High engine oil consumption |
Oil leaks: Worn gaskets or seals - Replace defective parts.
Oil viscosity is wrong - Use oil of correct viscosity.
Seized or wear piston rings - Replace piston rings.
Valve stems or guides are damaged - Valves must be replaced.
Cylinder liners or pistons are scored - Inspect pistons and liners, change as required.
| Engine knocking or noise |
Low coolant temperature - Normalize the temperature by warming up the engine.
Engine oil insufficient - Checking oil level and add if necessary.
Fuel injection pump timing is not adjusted - Set it up as required.
Pistons are broken or worn - Install new pistons.
Connecting rod failure or misalignment - Connecting rod needs to be aligned or changed.
| Starter motor turns slow |
Battery capacity is low - Low battery charging, charge as required.
Battery discharges quickly - Service or change the battery.
Disconnected cables or faulty battery terminals - Check cable connections and replace or service terminals.
| Starter does not work |
Battery is low or faulty - Replace or charge as required.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery voltage - Recharge the battery.
Defective starter motor - Change or repair starter.
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