International D407 Troubleshooting
| Engine Model: International Harvester D407 |
| Engine Type: 4-cycle inline 6-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 406.9 cu.in (6.67 L) |
| Rated Engine Power: 115-130 Hp (85-96 kW) at 2400 rpm |
| Fuel System Type: Direct fuel injection |
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| Engine difficult to start or doesn't start |
Fuel filter plugging - Service or replace the filter.
Air trapped in fuel system - Bleed air.
Faulty or dirty injection nozzles - Change fuel injection nozzles.
Fuel injection pump damage - Replace or repair injection pump.
Improper valve timing - Adjust or replace timing gear.
Dirty fuel pipes - Clean fuel pipes.
Incorrect injection timing - Set the injection timing correctly.
Worn cylinder or piston rings - Replace faulty parts.
Clogged fuel filter - Change the filter element.
Fuel injection pump is broken - Rebuild or change fuel pump.
Clogged air filter - Service air cleaner.
Improper nozzle opening pressure - Adjust as required.
| Engine stops running suddenly |
Improper setting of fuel injection pump timing - Adjust fuel injection pump as required.
Fuel filter plugged - Clean or replace the filter.
Engine is cold - Warm up engine as required.
Injection nozzles are stuck or clogged - Repair or change injection nozzles.
| Engine stalls while idling |
Low idle speed adjustment is incorrect - Need to adjust idle speed.
The valve clearance is incorrect - Check and adjust.
Fuel injection pump malfunctioning - Replacement or repair required.
Fuel injection nozzles are dirty or defective - Install a new kit of correctly balanced nozzles.
Fuel hoses or lines are dirty - Fuel lines and hoses need to be cleaned.
Plugged air filter - Replace air filter element.
Leaking cylinder head gasket - Install a new gasket.
Injection timing is wrong - Set up as recommended.
Fuel injection pump is faulty - Install a new fuel pump or repair.
One of moving engine components has failed - Repair or replace defective parts.
Clogged radiator fins or damaged radiator cap - Change cap or clean radiator.
Insufficient coolant - Top up coolant fluid and check system for leaks.
Broken or loose fan belt - Fan belt must be replaced.
Engine oil insufficient - Fill up the engine oil.
Damaged cylinder-head gasket - Install a new gasket.
Injection timing is out of adjustment - Adjust according to specifications.
| Oil pressure is insufficient |
Lack of oil - Checking oil level and add if necessary.
Oil pump is worn or damaged - Repair or replace.
Oil filter element clogging - Change or service engine oil filter.
Relief valve is defective or dirty - Change or clean relief valve.
Clearance of crankshaft bearing is excessive - Inspect and replace or repair faulty components.
Clearance of crankpin bearing is excessive - Inspect and replace or repair faulty components.
| Excessive oil consumption |
Oil leaking: Seals or gaskets are defective - Change to repair leaks.
Crankcase oil too light - Use proper viscosity oil.
Seized or wear piston rings - Piston rings replacement required.
Worn valve stems and valve guides - Install new valves.
Damaged pistons or cylinder liners - Check liners and pistons, replace as required.
Engine not warmed up - Warm up the engine.
Engine oil level low - Fill up the oil to required level.
Fuel injection pump timing is wrong - Adjust fuel injection pump as required.
Pistons are broken or worn - Have pistons replaced.
Faulty or misaligned connecting rod - Need to change or align the connecting rod.
Battery capacity is low - Battery is drained, recharge it.
Battery won’t hold charge - Service or replace the battery.
Corroded battery terminals or disconnected wires - Connect wiring properly or install new terminals.
Battery is drained or worn - Recharge or replace battery.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Battery voltage is low - Charge the battery.
Starter motor is faulty - Starter should be replaced.
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