Cummins NTA 855-G3 Troubleshooting
| Engine Model: Cummins NTA 855-G3 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 855 cu.in (14.0 L) |
| Rated Engine Power: 375-535 Hp (280-399 kW) at 1800 rpm |
| Fuel System Type: Pressure-Time fuel system |
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| Engine difficult to start or will not start |
Fuel filter element is clogged - Clean or replace the filter.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are damaged or dirty - Clean or replace injection nozzles.
Fuel injection pump is damaged - Rebuild or change fuel pump.
Improper valve timing - Adjust or change timing gear.
Restricted fuel pipes - Clean fuel pipes.
Unadjusted injection timing - Set up as recommended.
Worn piston rings and cylinder - Replace defective parts.
Dirty fuel filter - Clean or change the filter.
Fuel injection pump malfunction - Repair or change injection pump.
Dirty air cleaner - Service air cleaner.
Unadjusted nozzle opening pressure - Set up as recommended.
| Engine shuts off suddenly while running |
Improper setting of fuel injection pump timing - Set it up as required.
Clogged fuel filter - Filter maintenance required.
Engine is not preheated - Warm up to required temperature.
Injection nozzles are stuck or clogged - Clean or replace injection nozzles.
Improperly adjusted low idle speed - Adjust low idle speed.
Valve clearance is wrong - Adjust to proper valve clearance.
Fuel injection pump is defective - Change or repair the pump.
Dirty or damaged injection nozzles - Change fuel injection nozzles.
Fuel lines or hoses are dirty - Fuel lines and hoses need to be cleaned.
Dirty air cleaner - Change air filter element.
Cylinder head gasket defective - Cylinder-head gasket replacement required.
Injection timing is improper - Adjust according to specifications.
Fuel injection pump is broken - Replace or repair injection pump.
One of moving engine components is worn - Change or repair damaged parts.
Defective radiator cap or clogged radiator fins - Clean radiator or replace cap.
Lack of engine coolant - Add coolant fluid and inspect the cooling system for leaks.
Fan belt slipping or worn - Install new fan belt.
Engine oil level low - Need to add engine oil.
Defective cylinder head gasket - Cylinder-head gasket replacement required.
Incorrect injection timing - Set the injection timing correctly.
Lack of oil - Add oil to the engine crankcase.
Oil pump failure - Replace as required.
Oil filter is dirty - Service or replace engine oil filter.
Relief valve is stuck or broken - Change or service relief valve.
Excessive crankshaft bearing clearance - Inspect and replace or repair faulty components.
Crankpin bearing clearance is excessive - Inspect and replace or repair faulty parts.
| Engine consuming too much oil |
Oil leaking: Gaskets or seals may be damaged - Install new components.
Oil viscosity is incorrect - Use oil of correct viscosity.
Piston rings are stuck or broken - Change the piston rings as required.
Worn valve guides and valve stems - Change the valves.
Cylinder liners or pistons are scuffed - Inspect liners and pistons, replace as necessary.
Engine is cold - Warm up to required temperature.
Insufficient engine oil - Check and refill engine oil.
Timing of fuel injection pump is incorrect - Check the fuel injection pump timing adjustment.
Pistons are scored or worn - Install new pistons.
Connecting rod misalignment or failure - Need to align or replace the connecting rod.
| Starter motor cranks slow |
Low battery output voltage - Recharge the battery.
Battery is draining quickly - Service charging system or replace battery.
Disconnected wiring or bad battery terminals - Connect wires properly or change terminals.
Battery is drained or worn - Change or recharge battery.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery output voltage - Charge the battery.
Starter motor is defective - Starter needs to be replaced.
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