Cummins ISC-240 Troubleshooting
| Engine Model: Cummins ISC-240 |
| 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: 240 Hp (179 kW) at 2200 rpm |
| Aspiration Type: Turbocharged and aftercooled |
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| Engine starts hard or doesn't start |
Fuel filter plugged - Service or replace the filter.
Air in fuel system - Bleed fuel system.
Dirty or faulty injection nozzles - Check and replace nozzles if required.
Fuel injection pump malfunctioning - Repair or change injection pump.
Incorrect valve timing - Adjust or change timing gear.
Plugged fuel pipes - Clean or change fuel pipes.
Improper injection timing - Use correct injection timing adjustment.
Worn piston rings and cylinder - Change faulty parts.
| Diesel starts but stalls suddenly |
Fuel filter plugging - Replace filter element.
Faulty fuel injection pump - Replacement or repair required.
Plugged air filter - Install new air filter element.
Improper nozzle opening pressure - Set it correctly.
| Engine shuts off suddenly during operation |
Wrong setting of fuel injection pump timing - Adjust the pump as required.
Fuel filter plugged - Filter maintenance required.
Engine is not fully warmed up - Engine is not warmed up to the required temperature.
Injection nozzles are burnt or jammed - Service or change injection nozzles.
Low idle speed setting is incorrect - Normalize low idle speed.
The valve clearance is not adjusted - Adjust valve clearance.
Fuel injection pump is damaged - Replace or repair injection pump.
| Engine power is insufficient |
Fuel injection nozzles are damaged - Clean or change injection nozzles.
Dirty fuel lines or hoses - Clean fuel hoses and lines.
Dirty air filter - Clean air cleaner element.
Leaking cylinder head gasket - Install new cylinder head gasket.
Incorrect injection timing - Adjust according to specifications.
Fuel injection pump is broken - Rebuild or replace pump.
One of moving engine components is worn - Repair or replace defective parts.
Radiator core is clogged or radiator cap is leaking - Clean radiator or install new cap.
Insufficient coolant - Top up coolant fluid and check system for leaks.
Excessive wear of the fan belt - Change the fan belt.
Lack of engine oil - Fill up the engine oil.
Cylinder head gasket defective - Install new cylinder head gasket.
Unadjusted injection timing - Adjust according to specifications.
| Insufficient oil pressure |
Low crankcase oil level - Fill crankcase to proper oil level.
Oil pump malfunction - Repair or replace.
Plugged engine oil filter - Clean or change engine oil filter.
Stuck or worn relief valve - Relief valve need to be replaced or cleaned.
Crankshaft bearing clearance is excessive - Check and change or repair defective parts.
Crankpin bearing clearance is excessive - Test and replace or repair worn components.
| Excessive engine oil consumption |
Oil leaking: Damaged seals or gaskets - Replace to repair leaks.
Incorrect oil viscosity - Use proper viscosity oil.
Worn or stuck piston rings - Change the piston rings as required.
Valve guides and stems are worn - Change the valves.
Cylinder liners or pistons are scuffed - Check pistons and liners, change as required.
Engine is not fully warmed up - Warm up to required temperature.
Engine oil level low - Fill up the oil to required level.
Improper setting of fuel injection pump timing - Check the fuel injection pump timing adjustment.
Broken or worn pistons - Pistons replacement required.
Connecting rod is worn or not aligned - Need to change or align the connecting rod.
Low battery output - Recharge the battery.
Battery won’t hold charge - Service or change the battery.
Disconnected cables or faulty battery terminals - Check wiring and clean or replace terminals.
Battery is low or faulty - Replace or charge as required.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery power - Battery is drained, charge it.
Defective starter motor - Change or repair starter.
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