Kubota S2600 Troubleshooting
| Engine Model: Kubota S2600 |
| Engine Type: 4-cycle vertical 6-cylinder liquid-cooled diesel |
| Total Displacement: 158.5 cu.in (2.6 L) |
| Rated Engine Power: 55.6 Hp (41.5 kW) at 2800 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine starts hard or doesn't start |
Fuel filter plugging - Replace the filter element.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are faulty or clogged - Install a new kit of correctly balanced nozzles.
Faulty fuel injection pump - Rebuild or install a new injection pump.
Incorrect valve timing - Adjust or replace timing gear.
Fuel pipes are dirty - Clean or change fuel pipes.
Unadjusted injection timing - Adjust as recommended.
Piston rings and cylinder are worn - Change defective parts.
| Diesel starts but immediately stops |
Fuel filter plugging - Filter maintenance required.
Fuel injection pump is defective - Replacement or repair required.
Air filter clogged - Clean air cleaner element.
Nozzle opening pressure is improper - Set it correctly.
| Engine stops suddenly during operation |
Incorrect adjustment of fuel injection pump timing - Adjust as recommended.
Fuel filter plugging - Service the filter.
Engine is cold - Warm up the engine.
Injection nozzles sticking or clogged - Check injection nozzles and replace if required.
Incorrectly set low idle speed - Correct low idle adjustment.
Incorrect valve clearance - Adjust to proper valve clearance.
Damaged fuel injection pump - Install a new pump or rebuild.
Fuel injection nozzles fault - Install a new kit of correctly balanced nozzles.
Dirty fuel hoses or lines - Service fuel lines and hoses.
Air filter plugged - Clean or change.
Cylinder head gasket is worn - Gasket should be replaced.
Wrong injection timing - Adjust according to specifications.
Fuel injection pump is damaged - Install a new pump or rebuild.
One of moving engine components has failed - Replace or repair damaged components.
Clogged radiator fins or leaking radiator cap - Clean radiator or change cap.
Lack of coolant in cooling system - Add coolant and check the components of cooling system.
Fan belt is worn or faulty - Belt change is required.
Not enough engine oil - Need to add engine oil.
Defective cylinder head gasket - Install a new gasket.
Injection timing is improper - Adjust injection timing as required.
| Oil pressure is insufficient |
Oil level is insufficient - Fill up the engine oil.
Oil pump is defective - Remove and inspect oil pump.
Dirty oil filter - Change or clean engine oil filter element.
Stuck or worn relief valve - Replace or service relief valve.
Excessive oil clearance of crankshaft bearing - Test and repair or replace worn parts.
Crankpin bearing clearance is excessive - Test and replace or repair worn components.
| Diesel engine using too much oil |
Oil leaks: Gaskets or seals are excessively worn - Replace to repair leaks.
Incorrect oil viscosity - Use oil of proper viscosity.
Stuck or defective piston rings - Piston rings replacement required.
Valve guides or stems are damaged - Change the valves.
Scuffed pistons or cylinder liners - Inspect pistons and liners, replace as required.
Low coolant temperature - Normalize the temperature by warming up the engine.
Engine oil insufficient - Fill the crankcase with engine oil.
Incorrect adjustment of fuel injection pump timing - Check the fuel injection pump timing adjustment.
Worn or scored pistons - Install new pistons.
Connecting rod misalignment or failure - Align or replace connecting rod.
| Starter motor cranks slow |
Battery power is low - Charge the battery.
Battery drains quickly - Service or replace the battery.
Battery cables are disconnected or terminals are faulty - Connect wiring correctly or install new terminals.
Battery is low or faulty - Recharge or replace battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Low battery output voltage - Low battery charging, charge as required.
Defective starter motor - Repair or install a new starter.
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