International DT408 Troubleshooting
| Engine Model: International Harvester DT408 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 408 cu.in (6.7 L) |
| Rated Engine Power: 175-230 Hp (130-172 kW) at 2600 rpm |
| Fuel System Type: Direct injection |
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| Engine difficult to start or will not start |
Clogged fuel filter - Install new filter element.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are dirty or defective - Clean or change injection nozzles.
Fuel injection pump damage - Change or repair the pump.
Improper valve timing - Adjust or replace timing gear.
Restricted fuel pipes - Clean fuel pipes.
Injection timing is out of adjustment - Adjust injection timing as required.
Worn piston rings and cylinder - Change defective parts.
| Engine starts but then stops |
Fuel filter element is clogged - Filter maintenance required.
Fuel injection pump is not operating properly - Rebuild or install a new injection pump.
Restricted intake air - Clean or change the filter.
Nozzle opening pressure is not adjusted - Adjust according to specifications.
| Diesel shuts off while driving |
Fuel injection timing is not adjusted - Set up as recommended.
Fuel filter plugged - Change filter element.
Engine is not fully warmed up - Normalize the temperature by warming up the engine.
Defective or stuck injection nozzles - Check injection nozzles and replace if required.
| Engine stalls when idling |
Incorrect low idle setting - Correct low idle adjustment.
Valve out of adjustment - Adjust valve clearance.
Fuel injection pump failure - Install a new pump or rebuild.
Dirty or damaged injection nozzles - Change fuel injection nozzles.
Fuel lines or hoses are clogged - Clean fuel hoses and lines.
Dirty air cleaner - Change air filter element.
Cylinder head gasket is damaged - Install new cylinder head gasket.
Incorrect injection timing - Check injection timing adjustment.
Fuel injection pump malfunctioning - Replace or rebuild injection pump.
Any of moving engine parts is worn - Change or repair damaged parts.
Damaged radiator cap or dirty radiator core - Replace cap or clean radiator.
Engine coolant is insufficient - Refill to the correct level and inspect system for leaks.
Fan belt is broken or worn - Change the fan belt.
Engine oil insufficient - Fill the crankcase with engine oil.
Worn cylinder head gasket - Cylinder-head gasket replacement required.
Wrong injection timing - Set the injection timing correctly.
| Insufficient oil pressure |
Oil level is insufficient - Check and refill the oil.
Oil pump is defective - Check and replace if necessary.
Oil filter clogged - Replace or clean engine oil filter element.
Worn or dirty relief valve - Change or clean relief valve.
Clearance of crankshaft bearing is excessive - Inspect and replace or repair faulty components.
Crankpin bearing clearance is excessive - Test and repair or replace worn parts.
| Engine using too much oil |
External oil leaks: Damaged gaskets or seals - New components need to be installed.
Oil viscosity is wrong - Use oil of proper viscosity.
Stuck or defective piston rings - Install new piston rings.
Worn valve guides and valve stems - Install new valves.
Cylinder liners or pistons are scored - Check liners and pistons, change as required.
Low coolant temperature - Warm up engine as required.
Engine oil insufficient - Add oil to the engine crankcase.
Fuel injection pump timing is wrong - Adjust as recommended.
Broken or worn pistons - Pistons need to be replaced.
Connecting rod is not aligned or defective - Connecting rod needs to be replaced or aligned.
Battery capacity is low - Charge the battery.
Battery will not hold charge - Service or change the battery.
Terminals are faulty or battery cables are disconnected - Connect wiring properly or install new terminals.
Battery is low or faulty - Recharge or change battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Battery capacity is low - Charge the battery.
Starter motor failing - Replace or repair starter.
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