Cummins ISC-300 Troubleshooting
| Engine Model: Cummins ISC-300 |
| 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: 300 Hp (224 kW) at 2200 rpm |
| Aspiration Type: Turbocharged and aftercooled |
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| Engine difficult to start or will not start |
Clogged fuel filter - Service the filter.
Air in the fuel pipes - Bleed the fuel pipes.
Faulty or dirty injection nozzles - Check and replace nozzles if required.
Defective fuel injection pump - Install a new pump or rebuild.
Valve timing is incorrect - Use correct valve timing adjustment.
Fuel pipes clogging - Clean or change fuel pipes.
Wrong injection timing - Use correct injection timing adjustment.
Worn piston rings and cylinder - Replace defective components.
| Engine starts but stalls suddenly |
Fuel filter plugged - Clean or replace the filter.
Fuel injection pump is damaged - Replace injection pump or repair it.
Air filter element clogged - Replace air filter element.
Nozzle opening pressure is improper - Set it correctly.
| Engine shuts off while running |
Fuel injection timing is wrong - Set the fuel pump timing correctly.
Clogged fuel filter - Clean or replace the filter.
Engine is cold - Normalize the temperature by warming up the engine.
Injection nozzles are jammed or clogged - Check injection nozzles and replace if required.
| Engine stops at low idle speed |
Wrong adjustment of low idle speed - Test and adjust.
Valve clearance is out of adjustment - Correct valve clearance needs to be set.
Fuel injection pump is damaged - Install a new pump or rebuild.
Damaged or dirty injection nozzles - Check injection nozzles and replace if required.
Fuel lines or hoses are dirty - Service fuel hoses and lines.
Air cleaner is dirty - Clean or replace element.
Cylinder head gasket is blown - Change cylinder head gasket.
Improper injection timing - Set the injection timing correctly.
Fuel injection pump is broken - Change pump or rebuild it.
One of moving engine parts has broken - Repair or replace defective components.
Dirty radiator core or faulty radiator cap - Change cap or clean radiator.
Insufficient coolant - Fill radiator to proper level and check components for faults.
Excessive wear of the fan belt - The fan belt needs to be replaced.
Engine oil level is low - Add oil to the engine crankcase.
Damaged cylinder-head gasket - Gasket should be replaced.
Incorrect injection timing - Set up as recommended.
Engine oil insufficient - Add oil to the engine crankcase.
Oil pump failure - Repair or replace.
Plugged engine oil filter - Replace or service engine oil filter.
Relief valve is seized or worn - Replace or clean relief valve.
Excessive crankshaft bearing clearance - Test and replace or repair worn components.
Clearance of crankpin bearing is excessive - Inspect and replace or repair faulty components.
| Diesel engine using too much oil |
External oil leaks: Worn gaskets or seals - Install new components.
Oil viscosity is wrong - Use proper viscosity oil.
Piston rings are seized or worn - Replace piston rings.
Valve stems or guides are damaged - Need to replace the valves.
Worn cylinder liners or pistons - Check pistons and liners, change as required.
| Abnormal engine knocking or noise |
Low coolant temperature - Engine is not warmed up to the required temperature.
Lack of engine oil - Add oil to the engine crankcase.
Improper fuel injection timing - Adjust fuel injection pump as required.
Scored or worn pistons - Pistons need to be replaced.
Connecting rod misalignment or failure - Connecting rod needs to be replaced or aligned.
Battery voltage is low - Low battery charging, charge as required.
Battery is not holding charge - Service battery or change it.
Faulty battery terminals or disconnected cables - Connect cables properly or replace terminals.
Battery is discharged or defective - Replace or charge as required.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Battery power is low - Battery is drained, recharge it.
Damaged starter motor - Starter needs to be replaced.
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