Cummins ISM-420 Troubleshooting
| Engine Model: Cummins ISM-420 |
| Engine Type: 4-cycle inline 6-cylinder HPCR or Celect fuel injection liquid-cooled diesel |
| Total Displacement: 661 cu.in (10.8 L) |
| Rated Engine Power: 420 Hp (313 kW) at 2000 rpm |
| Aspiration Type: Turbocharged |
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| Engine difficult to start or will not start |
Fuel filter plugged - Clean or change the filter.
Air in the fuel pipes - Bleed the fuel pipes.
Fuel injection nozzles are clogged or faulty - Test injection nozzles and change if necessary.
Faulty fuel injection pump - Repair or replace injection pump.
Wrong valve timing - Use correct valve timing adjustment.
Dirty fuel pipes - Clean or change fuel pipes.
Unadjusted injection timing - Adjust injection timing as required.
Cylinder or piston rings are worn - Replace faulty parts.
| Diesel starts but stalls suddenly |
Fuel filter plugging - Replace the filter element.
Fuel injection pump is faulty - Rebuild or install a new injection pump.
Air filter clogged - Replace air filter element.
Unadjusted nozzle opening pressure - Adjust as recommended.
| Engine stops unexpectedly during operation |
Wrong setting of fuel injection pump timing - Check the fuel injection pump timing adjustment.
Fuel filter element clogging - Clean the filter element.
Low coolant temperature - Warm up to required temperature.
Defective or stuck injection nozzles - Clean or change injection nozzles.
Incorrect low idle setting - Adjust low idling as recommended.
The valve clearance is incorrect - Adjust to proper valve clearance.
Fuel injection pump is broken - Repair or replace injection pump.
Fuel injection nozzles are dirty or defective - Install a new kit of correctly balanced nozzles.
Fuel hoses or lines clogging - Clean fuel system hoses and lines.
Clogged air filter - Clean or replace element.
Blown cylinder head gasket - Gasket should be replaced.
Injection timing is improper - Adjust as recommended.
Fuel injection pump is defective - Change or repair the pump.
One of moving engine components has failed - Repair or replace defective components.
Radiator core is dirty or radiator cap is damaged - Replace cap or clean radiator.
Coolant level is low - Add coolant and check the components of cooling system.
Loose or defective fan belt - If necessary, replace the belt.
Engine oil level is low - Fill up the oil to required level.
Worn cylinder head gasket - Install a new gasket.
Injection timing is wrong - Adjust according to specifications.
Engine oil insufficient - Add oil to the engine crankcase.
Oil pump is defective - Install a new pump.
Oil filter element clogging - Replace or clean engine oil filter element.
Relief valve is seized or worn - Replace or clean relief valve.
Excessive oil clearance of crankshaft bearing - Inspect and replace or repair faulty components.
Crankpin bearing clearance is excessive - Inspect and replace or repair faulty components.
| Engine consuming too much oil |
Oil leaks: Gaskets or seals may be damaged - Replace worn parts to avoid leaks.
Crankcase oil too light - Use correct viscosity oil.
Piston rings are seized or worn - Piston rings need to be replaced.
Damaged valve stems or valve guides - Replace defective valves.
Cylinder liners or pistons are scored - Inspect pistons and liners, fit new components as necessary.
Low coolant temperature - Warm up to required temperature.
Engine oil insufficient - Add oil to the engine crankcase.
Fuel injection pump timing is not adjusted - Set it up as required.
Pistons are scored or worn - Replace the pistons.
Faulty or misaligned connecting rod - Need to align or replace the connecting rod.
Low battery capacity - Battery is drained, recharge it.
Battery drains quickly - Battery needs service or replacement.
Disconnected cables or faulty battery terminals - Connect wiring properly or install new terminals.
Battery is discharged or worn - Recharge or change battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery capacity - Battery is drained, recharge it.
Starter motor is damaged - Starter needs to be changed.
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