Cummins ISM-425 Troubleshooting
| Engine Model: Cummins ISM-425 |
| 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: 425 Hp (317 kW) at 2000 rpm |
| Aspiration Type: Turbocharged |
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| Diesel engine hard to start or doesn't start |
Dirty fuel filter - Replace the filter element.
Air in the fuel lines - Bleed the fuel lines.
Dirty or faulty injection nozzles - Service or change injection nozzles.
Fuel injection pump malfunctioning - Replace or rebuild injection pump.
Unadjusted valve timing - Adjust or change timing gear.
Plugged fuel pipes - Service fuel pipes.
Injection timing is incorrect - Set up as recommended.
Damaged piston rings and cylinder - Change faulty parts.
| Diesel starts and then shuts off |
Fuel filter element clogging - Clean the filter element.
Fuel injection pump is broken - Replace or repair injection pump.
Air filter is clogged - Change air filter element.
Nozzle opening pressure is not adjusted - Set up as recommended.
| Engine stalls while running |
Improper setting of fuel injection pump timing - Set it up as required.
Fuel filter plugging - Install new filter element.
Low coolant temperature - Warm up to required temperature.
Injection nozzles are burnt or jammed - Clean or replace injection nozzles.
Incorrect low idle speed adjustment - Adjust low idle speed.
Valve clearance is not correct - Adjust to proper valve clearance.
Fuel injection pump malfunction - Replacement or repair required.
Clogged or defective injection nozzles - Clean or change injection nozzles.
Fuel hoses or lines clogging - Clean fuel system lines and hoses.
Restricted intake air - Service air cleaner.
Worn cylinder head gasket - Replace cylinder head gasket.
Improper injection timing - Check injection timing adjustment.
Fuel injection pump is broken - Rebuild or change fuel pump.
Any of moving engine components is faulty - Repair or replace defective parts.
Clogged radiator fins or leaking radiator cap - Replace cap or clean radiator.
Low coolant level - The cooling system needs to be refilled and checked for faults.
Fan belt is worn or faulty - Belt change is required.
Engine oil insufficient - Fill the crankcase with engine oil.
Defective cylinder head gasket - Replace cylinder head gasket.
Wrong injection timing - Use correct injection timing adjustment.
| Insufficient oil pressure |
Engine oil insufficient - Add oil to the engine crankcase.
Oil pump is damaged - Check and replace if necessary.
Oil filter clogged - Clean or change engine oil filter.
Relief valve is stuck or worn - Change or service relief valve.
Clearance of crankshaft bearing is excessive - Check and replace or repair defective parts.
Excessive oil clearance of crankpin bearing - Test and replace or repair worn components.
| Engine oil consumption is too high |
Oil leakage: Gaskets or seals may be damaged - Defective components must be replaced.
Oil viscosity is incorrect - Use oil of proper viscosity.
Worn or broken piston rings - Replace piston rings.
Valve guides and stems are worn - Need to replace the valves.
Scored pistons or cylinder liners - Inspect pistons and liners, change as required.
Engine is not preheated - Warm up the engine.
Engine oil insufficient - Fill up the engine oil.
Fuel injection pump timing is wrong - Set it up as required.
Pistons are broken or worn - Install new pistons.
Faulty or misaligned connecting rod - Replace or align connecting rod.
Battery voltage is low - Charge the battery.
Battery will not hold charge - Battery needs service or replacement.
Battery cables are disconnected or terminals are faulty - Check cables and clean or change terminals.
Battery is low or faulty - Charge or change the battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Battery power is low - Charge the battery.
Damaged starter motor - Starter needs to be replaced.
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