Cummins N14 Troubleshooting
| Engine Model: Cummins N14 |
| Engine Type: 4-cycle inline 6-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 855 cu.in (14 L) |
| Rated Engine Power: 205-525 Hp (153-391 kW) at 2000 rpm |
| Aspiration Type: Turbocharged |
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| Engine starts up hard or will not start |
Fuel filter plugging - Change filter element.
Air in fuel tank - Bleed fuel tank.
Defective or clogged injection nozzle - Clean or replace injection nozzles.
Defective fuel injection pump - Replacement or repair required.
Unadjusted valve timing - Use correct valve timing adjustment.
Dirty fuel pipes - Service or replace fuel pipes.
Injection timing is wrong - Adjust injection timing as required.
Cylinder or piston rings are worn - Change faulty components.
| Engine starts but stops suddenly |
Fuel filter plugging - Service the filter.
Defective fuel injection pump - Rebuild or install a new injection pump.
Clogged air cleaner - Clean air cleaner element.
Nozzle opening pressure is improper - Adjust according to specifications.
| Engine stops suddenly during operation |
Wrong setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Fuel filter plugged - Filter maintenance required.
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 stalls at low idle speed |
Low idle speed adjustment is incorrect - Test and adjust.
Incorrect valve clearance - Adjust to proper valve clearance.
Fuel injection pump malfunction - Replace injection pump or repair it.
Damaged or dirty injection nozzles - Test injection nozzles and change if necessary.
Dirt in the fuel hoses or lines - Clean fuel lines and hoses.
Air filter clogged - Replace air filter element.
Worn cylinder head gasket - Change cylinder head gasket.
Injection timing is incorrect - Use correct injection timing adjustment.
Faulty fuel injection pump - Rebuild or replace pump.
One of moving engine parts is faulty - Change or repair damaged parts.
Clogged radiator core or leaking radiator cap - Change cap or clean radiator.
Low coolant level - Add coolant fluid to cooling system and also check it for leaks.
Fan belt is broken or worn - If necessary, replace the belt.
Engine oil level low - Check oil level and add oil as required.
Blown cylinder head gasket - Install new cylinder head gasket.
Incorrect injection timing - Set up as recommended.
| Oil pressure is insufficient |
Engine oil insufficient - Add oil to the engine crankcase.
Defective oil pump - Remove and inspect oil pump.
Oil filter is dirty - Replace or service engine oil filter.
Stuck or worn relief valve - Replace or service relief valve.
Excessive oil clearance of crankshaft bearing - Test and repair or replace worn parts.
Excessive crankpin bearing clearance - Check and replace or repair defective parts.
| Excessive oil consumption |
Oil leaking: Gaskets or seals may be damaged - Replace worn parts to avoid leaks.
Oil viscosity is incorrect - Use proper viscosity oil.
Damaged or seized piston rings - Change the piston rings as required.
Valve stems and guides are worn - Change the valves.
Scored pistons or cylinder liners - Inspect liners and pistons, change as necessary.
Engine is not warmed up to the required temperature - Warm up engine as required.
Low engine oil level - Fill up the oil to required level.
Wrong setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Worn or scored pistons - Replace the pistons as required.
Connecting rod failure or misalignment - Align or change connecting rod.
Battery power is low - Recharge the battery.
Battery runs out quickly - Battery needs to be serviced or replaced.
Faulty battery terminals or disconnected cables - Connect wires properly or change terminals.
Battery is low or faulty - Battery needs to be recharged or replaced.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Low battery capacity - Battery needs to be recharged.
Defective starter motor - Change or repair starter.
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