International DT407 Troubleshooting
| Engine Model: International Harvester DT407 |
| Engine Type: 4-cycle inline 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 406.9 cu.in (6.67 L) |
| Rated Engine Power: 125-145 Hp (92-107 kW) at 2400 rpm |
| Fuel System Type: Direct fuel injection |
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| Engine starts hard or will not start |
Fuel filter plugging - Change filter element.
There is air in the fuel system - Bleed the system.
Clogged injection nozzle - Inspect nozzles and replace if necessary.
Fuel injection pump malfunctioning - Replace injection pump or repair it.
Wrong valve timing - Use correct valve timing adjustment.
Plugged fuel pipes - Clean fuel pipes.
Unadjusted injection timing - Use correct injection timing adjustment.
Cylinder or piston rings are worn - Replace faulty components.
Fuel filter plugging - Filter maintenance required.
Fuel injection pump malfunction - Replace or rebuild injection pump.
Clogged air filter - Carry out maintenance on air filter.
Unadjusted nozzle opening pressure - Set it correctly.
| Engine stalls after running |
Timing of fuel injection pump is incorrect - Set up as recommended.
Fuel filter plugged - Replace filter element.
Engine is not preheated - Warm up engine as required.
Injection nozzles are burnt or jammed - Repair or replace injection nozzles.
Incorrectly set low idle speed - Correct the settings.
Incorrect valve clearance - Have it adjusted.
Fuel injection pump is faulty - Replace or repair injection pump.
Fuel injection nozzles are damaged - Inspect nozzles and replace if necessary.
Fuel lines or hoses are dirty - Clean fuel system lines and hoses.
Air filter plugged - Install new air filter element.
Cylinder head gasket is damaged - Install a new gasket.
Injection timing is incorrect - Adjust according to specifications.
Faulty fuel injection pump - Change or repair the pump.
One of moving engine components has failed - Replace or repair damaged components.
Radiator fins are dirty or radiator cap is defective - Clean radiator or replace cap.
Engine coolant is insufficient - Add coolant fluid to cooling system and also check it for leaks.
Loose or damaged fan belt - Belt change is required.
Low engine oil level - Need to add engine oil.
Blown cylinder head gasket - Change cylinder head gasket.
Injection timing is wrong - Check injection timing adjustment.
| Insufficient oil pressure |
Oil level is insufficient - Check oil level and add oil as required.
Oil pump is damaged - Replace as required.
Oil filter clogged - Change or clean engine oil filter element.
Worn or dirty relief valve - Change or clean relief valve.
Excessive oil clearance of crankshaft bearing - Test and repair or replace worn parts.
Clearance of crankpin bearing is excessive - Test and replace or repair worn components.
| Excessive engine oil consumption |
External oil leaks: Worn seals or gaskets - To repair leaks, replace worn parts.
Oil viscosity is incorrect - Fill up with the correct oil viscosity.
Worn or broken piston rings - Piston rings replacement required.
Damaged valve stems or valve guides - Need to replace the valves.
Scuffed pistons or cylinder liners - Check liners and pistons, replace as required.
Engine is cold - Warm up the engine.
Not enough engine oil - Fill the crankcase with engine oil.
Timing of fuel injection pump is incorrect - Adjust as recommended.
Pistons are worn or scored - Pistons need to be replaced.
Connecting rod misalignment or failure - Alignment procedure or replacement is required.
Low battery power - Low battery charging, charge as required.
Battery will not hold charge - Service charging system or replace battery.
Disconnected cables or faulty battery terminals - Check wiring connections and replace or clean terminals.
Battery is drained or worn - Battery needs to be recharged or replaced.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Battery voltage is low - Battery is drained, charge it.
Defective starter motor - Repair or install a new starter.
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