Cummins NT855 Troubleshooting
| Engine Model: Cummins NT855 |
| Engine Type: 4-cycle inline 6-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 855 cu.in (14 L) |
| Rated Engine Power: 240-450 Hp (179-336 kW) at 2000 rpm |
| Aspiration Type: Turbocharged |
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| Engine hard to start or won't start |
Fuel filter plugged - Change the filter element.
Air in the fuel system - Air bleeding.
Clogged or burnt injection nozzle - Replace injection nozzles.
Damaged fuel injection pump - Replace or rebuild injection pump.
Unadjusted valve timing - Use correct valve timing adjustment.
Restricted fuel pipes - Clean or change fuel pipes.
Wrong injection timing - Set up as recommended.
Worn cylinder or piston rings - Replace faulty components.
| Engine starts but then stalls |
Clogged fuel filter - Clean the filter or install new filter element.
Fuel injection pump is broken - Change or repair the pump.
Clogged air filter element - Clean or replace element.
Incorrect nozzle opening pressure - Set up as recommended.
| Engine stalls while running |
Fuel injection timing is not adjusted - Set the fuel pump timing correctly.
Fuel filter plugged - Service or replace the filter.
Engine is not fully warmed up - Engine is not warmed up to the required temperature.
Injection nozzles are stuck or clogged - Clean or change injection nozzles.
Too low idle RPM - Adjustment required.
Incorrect valve clearance - Adjust valve clearance.
Fuel injection pump is damaged - Replacement or repair required.
Damaged or dirty injection nozzles - Service or change injection nozzles.
Dirt in the fuel lines or hoses - Clean fuel system lines and hoses.
Air cleaner is dirty - Clean or change the filter.
Cylinder head gasket is defective - Gasket should be replaced.
Injection timing is improper - Adjust according to specifications.
Fuel injection pump is damaged - Repair or change injection pump.
One of moving engine components is worn - Replace or repair damaged components.
Clogged radiator core or damaged radiator cap - Clean radiator or replace cap.
Engine coolant is insufficient - Top up coolant fluid and check system for leaks.
Damaged or worn fan belt - Belt replacement is recommended.
Lack of engine oil - Add oil to the engine crankcase.
Cylinder head gasket is defective - Install new cylinder head gasket.
Wrong injection timing - Adjust injection timing as required.
Oil level is low - Checking oil level and add if necessary.
Oil pump failure - Install a new pump.
Oil filter is clogged - Replace or service engine oil filter.
Relief valve is stuck or broken - Change or clean relief valve.
Excessive crankshaft bearing clearance - Inspect and replace or repair faulty components.
Excessive crankpin bearing clearance - Inspect and replace or repair faulty parts.
| Engine consuming too much oil |
Oil leaks: Damaged seals or gaskets - Change to repair leaks.
Incorrect oil viscosity - Use proper viscosity oil.
Worn or broken piston rings - Change the piston rings as required.
Valve stems and guides are worn - Install new valves.
Scuffed cylinder liners or pistons - Inspect liners and pistons, replace as necessary.
Engine is cold - Warm up to required temperature.
Lack of engine oil - Fill the crankcase with engine oil.
Improper setting of fuel injection pump timing - Set up as recommended.
Pistons are broken or worn - Replace the pistons.
Connecting rod is defective or misaligned - Align or replace connecting rod.
Battery voltage is low - Low battery charging, charge as required.
Battery drains quickly - Service charging system or install new battery.
Faulty battery terminals or disconnected cables - Connect cables correctly or replace terminals.
Battery is discharged or worn - Charge or replace the battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Battery capacity is low - Recharge the battery.
Damaged starter motor - Starter should be changed.
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