Cummins NTC-400 Troubleshooting
| Engine Model: Cummins NTC-400 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 855 cu.in (14.0 L) |
| Rated Engine Power: 400 Hp (298 kW) at 2100 rpm |
| Fuel System Type: Pressure-Time fuel system |
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| Engine difficult to start or will not start |
Dirty fuel filter - Clean the filter element.
Air in the fuel lines - Bleed the fuel lines.
Faulty fuel injection nozzles - If necessary, replace with a new nozzle.
Fuel injection pump malfunction - Install a new fuel pump or repair.
Improper valve timing - Use correct valve timing adjustment.
Fuel pipes are dirty - Service or change fuel pipes.
Injection timing is incorrect - Adjust as recommended.
Worn piston rings and cylinder - Change faulty parts.
| Engine starts but immediately stalls |
Clogged fuel filter - Service or replace the filter.
Fuel injection pump is defective - Replace or repair injection pump.
Plugged air filter - Clean or change the filter.
Unadjusted nozzle opening pressure - Adjust as required.
| Engine stops suddenly during operation |
Timing of fuel injection pump is incorrect - Set it up as required.
Dirty fuel filter - Replace filter element.
Engine not warmed up - Warm up engine as required.
Stuck or clogged injection nozzle - Change or repair injection nozzles.
| Engine stops at low idle speed |
Low idle speed set incorrectly - Correct low idle settings.
Improper valve clearance - Adjust valve clearance according to specifications.
Fuel injection pump is broken - Install a new pump or rebuild.
| Diesel engine loses power |
Defective injection nozzle - Clean or change injection nozzles.
Dirt in the fuel lines or hoses - Clean fuel lines and hoses.
Plugged air filter - Service air cleaner.
Cylinder-head gasket is leaking - Install a new gasket.
Injection timing is incorrect - Set up as recommended.
Fuel injection pump is broken - Repair or install a new fuel pump.
One of moving engine parts has broken - Change or repair damaged parts.
Clogged radiator core or damaged radiator cap - Install new cap or clean radiator.
Lack of coolant in cooling system - Fill radiator to proper level and check components for faults.
Fan belt slipping or worn - Replace as required.
Low engine oil level - Checking oil level and add if necessary.
Cylinder head gasket defective - Gasket should be replaced.
Injection timing is improper - Set the injection timing correctly.
Engine oil insufficient - Need to add oil.
Oil pump failure - Install a new pump.
Clogged oil filter element - Clean or change engine oil filter.
Relief valve is stuck or broken - Replace or clean relief valve.
Excessive crankshaft bearing clearance - Test and repair or replace worn parts.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
| Engine consuming too much oil |
External oil leaks: Damaged gaskets or seals - Change worn parts according to specifications.
Incorrect oil viscosity - Use oil of correct viscosity.
Piston rings are stuck or worn - Have piston rings replaced.
Valve stems or guides are damaged - Install new valves.
Cylinder liners or pistons are worn - Check pistons and liners, replace as required.
Engine not warmed up - Warm up engine as required.
Engine oil level is low - Fill up the engine oil.
Improper setting of fuel injection pump timing - Adjust as recommended.
Piston wear or scoring - Pistons need to be replaced.
Connecting rod is defective or not aligned - Align or change connecting rod.
Low battery power - Charge the battery.
Battery won’t hold charge - Service charging system or change battery.
Disconnected battery cables or bad terminals - Check wiring connections and replace or clean terminals.
Battery is discharged or worn - Change or recharge battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Low battery output voltage - Battery is drained, recharge it.
Faulty starter motor - Change or repair starter.
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