Cummins ISC-260 Troubleshooting
| Engine Model: Cummins ISC-260 |
| Engine Type: 4-cycle 6-cylinder CAPS or common-rail fuel injection liquid-cooled diesel |
| Total Displacement: 505 cu.in (8.3 L) |
| Rated Engine Power: 260 Hp (194 kW) at 2200 rpm |
| Aspiration Type: Turbocharged and aftercooled |
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| Engine starts hard or will not start |
Dirty fuel filter - Change filter element.
Air in the fuel lines - Bleed the fuel lines.
Dirty or damaged injection nozzles - Test injection nozzles and change if necessary.
Fuel injection pump malfunction - Repair or replace injection pump.
Incorrect valve timing - Set the valve timing correctly.
Dirty fuel pipes - Clean or change fuel pipes.
Injection timing is wrong - Check injection timing adjustment.
Worn cylinder or piston rings - Change defective components.
Clogged fuel filter - Replace the filter element.
Fuel injection pump is broken - Replace or repair injection pump.
Clogged air filter element - Clean or replace the element.
Nozzle opening pressure is improper - Adjust as recommended.
| Engine stops running suddenly |
Fuel injection timing is wrong - Set the fuel pump timing correctly.
Fuel filter element clogging - Change filter element.
Coolant temperature is low - Warm up engine as required.
Defective or stuck injection nozzles - Change or repair injection nozzles.
| Engine stops at low idle speed |
Too low idle RPM - Test and adjust.
Incorrect valve clearance - Need to adjust valve clearance.
Fuel injection pump is not working correctly - Repair or replace injection pump.
Defective injection nozzle - Check and replace nozzles if required.
Fuel lines or hoses are clogged - Service fuel lines and hoses.
Air filter is dirty - Replace air filter element.
Cylinder head gasket is damaged - Install new cylinder head gasket.
Wrong injection timing - Adjust as recommended.
Faulty fuel injection pump - Change or repair the pump.
One of moving engine parts is faulty - Repair or replace defective components.
Damaged radiator cap or dirty radiator core - Replace cap or clean radiator.
Low coolant level - Add coolant fluid and inspect the cooling system for leaks.
Loose or damaged fan belt - If necessary, replace the belt.
Insufficient engine oil - Fill up the oil to required level.
Defective cylinder head gasket - Install a new gasket.
Injection timing is wrong - Adjust according to specifications.
| Oil pressure is insufficient |
Oil level is insufficient - Fill crankcase to proper oil level.
Oil pump failure - Install a new pump.
Oil filter element clogged - Replace or clean engine oil filter element.
Relief valve is stuck or broken - Change or service relief valve.
Crankshaft bearing clearance is excessive - Test and replace or repair worn components.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
| Excessive oil consumption |
External oil leaks: Worn seals or gaskets - Replace defective parts.
Wrong oil viscosity - Use oil of correct viscosity.
Damaged or seized piston rings - Change the piston rings as required.
Worn valve stems and valve guides - Valves must be replaced.
Worn pistons or cylinder liners - Check liners and pistons, install new components as required.
Engine is not preheated - Warm up the engine.
Engine oil level is low - Need to add engine oil.
Improper setting of fuel injection pump timing - Adjust fuel injection pump as required.
Worn or scored pistons - Install new pistons.
Misaligned or faulty connecting rod - Alignment procedure or replacement is required.
Battery capacity is low - Battery is drained, recharge it.
Battery does not hold charge - Service battery or replace it.
Battery cables are disconnected or terminals are faulty - Check cable connections and change or clean terminals.
Battery is low or faulty - Change or recharge battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Low battery output - Battery is drained, recharge it.
Starter motor is damaged - Starter needs to be replaced.
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