International DT239 Troubleshooting
| Engine Model: International Harvester DT239 |
| Engine Type: 4-stroke in-line 4-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 238.6 cu.in (3.9 L) |
| Rated Engine Power: 80-95 Hp (59-71 kW) at 2400 rpm |
| Fuel System Type: Direct injection |
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| Engine starts up hard or doesn't start |
Fuel filter element is dirty - Clean or change the filter.
Air in fuel system - Bleed fuel system.
Dirty or faulty injection nozzles - If necessary, replace with a new nozzle.
Fuel injection pump malfunctioning - Rebuild or install a new injection pump.
Valve timing is wrong - Set the valve timing correctly.
Restricted fuel pipes - Service or change fuel pipes.
Injection timing is wrong - Set up as recommended.
Cylinder or piston rings are worn - Replace defective parts.
| Engine starts but immediately stalls |
Fuel filter plugging - Change filter element.
Damaged fuel injection pump - Replace or repair injection pump.
Dirty air cleaner - Clean or change the filter.
Unadjusted nozzle opening pressure - Set up as recommended.
| Engine shuts off while running |
Improper fuel injection timing - Set the fuel pump timing correctly.
Fuel filter element clogging - Clean or change the filter.
Engine is not warmed up to the required temperature - Warm up the engine.
Injection nozzles are burnt or jammed - Repair or replace injection nozzles.
Incorrectly set low idle speed - Adjust as required.
Valve clearance is out of adjustment - Adjust valve clearance.
Fuel injection pump is not operating properly - Rebuild or install a new injection pump.
| Diesel engine is losing power |
Damaged or dirty injection nozzles - Change fuel injection nozzles.
Dirt in the fuel lines or hoses - Service fuel hoses and lines.
Clogged air filter - Clean air cleaner element.
Worn cylinder head gasket - Replace the gasket as required.
Incorrect injection timing - Set the injection timing correctly.
Fuel injection pump failure - Repair or replace injection pump.
One of moving engine components has failed - Replace or repair damaged components.
Radiator fins are clogged or radiator cap is faulty - Install new cap or clean radiator.
Low coolant level - Add coolant and check the components of cooling system.
Loose or damaged fan belt - Install new fan belt.
Low engine oil level - Need to add engine oil.
Cylinder head gasket is worn - Gasket should be replaced.
Injection timing is out of adjustment - Adjust injection timing as required.
| Insufficient oil pressure |
Low oil level - Checking oil level and add if necessary.
Oil pump is defective - Repair or change.
Dirty oil filter - Change or service engine oil filter.
Worn or dirty relief valve - Relief valve need to be replaced or cleaned.
Excessive crankshaft bearing clearance - Check and change or repair defective parts.
Clearance of crankpin bearing is excessive - Test and repair or replace worn parts.
| Excessive engine oil consumption |
Oil leaking: Worn gaskets or seals - To repair leaks, replace worn parts.
Oil viscosity is incorrect - Use correct viscosity oil.
Worn or stuck piston rings - Install new piston rings.
Damaged valve stems or valve guides - Install new valves.
Worn cylinder liners or pistons - Check pistons and liners, change as required.
| Abnormal engine knocking or noise |
Engine is not warmed up to the required temperature - Engine is not warmed up to the required temperature.
Not enough engine oil - Check and refill engine oil.
Fuel injection pump timing is wrong - Set it up as required.
Piston wear or scoring - Pistons need to be replaced.
Connecting rod is defective or misaligned - Connecting rod must be aligned or replaced.
Battery voltage is low - Charge the battery.
Battery discharges quickly - Service charging system or replace battery.
Battery cables are disconnected or terminals are faulty - Check cable connections and change or clean terminals.
Battery is discharged or worn - Replace or charge as required.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Low battery power - Battery is drained, charge it.
Defective starter motor - Starter needs to be replaced.
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